JP4092320B2 - Control device for hybrid air conditioner - Google Patents

Description

  The present invention relates to control of an air-water cooling hybrid type air conditioner having both an air-cooling heat exchanger that exchanges heat with a heat exchange medium and a water-cooling heat exchanger that exchanges heat with a water heat source.

In an air conditioner having a heat pump serving as an air-cooled heat exchanger, cooling and heating are generally performed using a direct expansion method (hereinafter referred to as a direct expansion method). Hereinafter, the cooling system will be described using a cooling cycle. In the direct expansion method, a heat exchange medium is sent to an evaporator installed in a room, and the coil is expanded and vaporized in the coil to cool the coil and exchange heat with the passing air. It absorbs heat from the air. Since this air conditioner has a structure in which heat is exchanged directly with air using a condenser installed outside the room, the structure is simple, but the performance varies greatly depending on the air temperature (outside air temperature) that radiates heat. ing.
On the other hand, various heat pumps as water-cooled heat exchangers have been proposed because of their better heat exchange rate than air-cooled. Here, the difference between the air-cooled and water-cooled heat pumps will be described. This water-cooled heat pump dissipates heat to cooling water such as ground water using a heat exchange medium as a water heat source, water in a cooling tower, etc., and thus has a characteristic that heat exchange performance is more stable than air-cooled heat pumps. However, even if a heat dissipation method for cooling water is used, the cost is high if tap water is used as the cooling water, and the use of groundwater may not be sufficient in areas where pumping is restricted. In addition, when heat is exchanged by embedding a flow path for circulating water or antifreeze as cooling water, if the temperature of the cooling water exceeds a certain temperature due to a heat pump principle problem, the cooling water and the heat exchange medium The efficiency of heat exchange between the two is reduced.

  Here, the principle of a heat pump using cooling water as a heat source will be described. As shown in FIG. 19, the heat pump is described with a diagram showing a change on a saturation line of a heat exchange medium used for enthalpy (h) and pressure (p). In the heat pump, the functions of the indoor unit and the condenser and evaporator of the indoor unit are reversed during heating and cooling, but the heat exchange efficiency of the water-cooled type is also used during heating and cooling, as shown below. Will improve. The heating cycle will be described with reference to the left side of FIG. In the heat pump, an evaporator (outdoor unit) serves as a heat exchanger with a heat source, and this is a different part between the air-cooled cooler and the water-cooled cooler. The heat transfer coefficient of water is very large, several hundred times that of air, and the heat capacity is also large, so the endothermic reaction is carried out efficiently, and the heat pump power cost (electricity consumption) is air. Compared to the above, the efficiency is improved and the heating capacity is improved. If the cycle at the time of cooling is demonstrated using the figure of the right side of FIG. 19, an indoor unit and an outdoor unit will become an evaporator and a condenser, respectively, and the heat radiation in a condenser will become the work of a cooler. Since this heat efficiency is overwhelmingly higher than that of air as in the case of heating, it is performed at a power cost with less heat dissipation by water, and the efficiency is improved and the cooling capacity is improved. In view of such characteristics, in recent years, for example, Patent Documents 1 and 2 have proposed hybrid type air conditioners including air-cooled and water-cooled heat exchangers.

JP 2004-116800 A JP-A-2004-116806

Patent Documents 1 and 2 propose an air conditioner having an air-cooled type and a water-cooled type heat exchanger. However, in the operation (cycle) of cooling, heating and dehumidification, the optimum of air-cooled type and water-cooled type heat exchanger is proposed. It is not described to switch at a proper timing. Switching between these air-cooled and water-cooled heat exchangers is a very important issue for efficiently operating various devices equipped with a so-called refrigeration cycle, especially air conditioners.
An object of the present invention is to provide a control device for an air-water-cooled hybrid air conditioner that can efficiently operate an air-conditioner having air-cooled and water-cooled heat exchangers.

To achieve the above object, the present invention includes a first flow path air-cooled heat exchanger for exchanging heat with the gas to heat exchange medium circulating connected to the air conditioning equipment flow path was found provided A second flow path provided with a water-cooled heat exchanger for exchanging heat using cooling water for the heat exchange medium circulating in the flow path, and a flow path through which the heat exchange medium flows. and a switching means for switching the road or the second flow path, a control device of the air-water cooling hybrid air conditioning system capable of performing cooling cycle and heating cycle, flowing said heat exchange medium in accordance with the output fluctuation of the air-conditioning equipment An inverter mode for switching the flow path to the first flow path or the second flow path is provided, and this inverter mode is the output fluctuation information from the output fluctuation detecting means for detecting the output fluctuation of the hybrid air conditioner during the cooling cycle. Is preset If the output information is higher than the first setting information, the flow path through which the heat exchange medium flows is switched from the first flow path to the second flow path, and the output fluctuation information is set in advance during the heating cycle. The switching means is controlled to switch the flow path through which the heat exchange medium flows from the first flow path to the second flow path . In such a configuration, the output fluctuations of the air-conditioning equipment and switching parameter, the flow path heat exchange medium flows in accordance with the variation, a first flow path air-cooled heat exchanger is provided, the water-cooling heat It is selectively switched to the second flow path provided with the exchange.

Here, a cooling water mode for switching the flow path through which the heat exchange medium flows to the first flow path or the second flow path according to the temperature fluctuation of the cooling water is provided. In this cooling water mode, cooling is performed during the cooling cycle. When the temperature information from the temperature detecting means for detecting the temperature of the water is higher than the first set temperature set in advance, the flow path through which the heat exchange medium flows is changed from the second flow path to the first flow path. When the temperature information from the temperature detecting means is lower than the preset second set temperature during the switching and heating cycle, the flow path through which the heat exchange medium flows is changed from the second flow path to the first flow path. The switching means is controlled to switch.
In addition, an outside air temperature mode is provided in which the flow path through which the heat exchange medium flows is switched to the first flow path or the second flow path in accordance with temperature fluctuations around the hybrid air conditioner . When the temperature information from the outside air temperature detecting means for detecting the ambient temperature of the hybrid air conditioner is higher than the preset first outside air set temperature, the flow path through which the heat exchange medium flows from the first flow path. When the temperature information from the outside air temperature detection means is lower than the preset second outside air set temperature during the heating cycle, the channel through which the heat exchange medium flows is changed to the first channel. from that controls the switching means to switch to the second channel.

  According to the present invention, the air-cooled heat exchanger is provided in the flow path through which the heat exchange medium flows in response to at least one of the following fluctuations in the temperature of the cooling water, the temperature around the hybrid air conditioner, and the output fluctuation of the air conditioning equipment. Since the first flow path and the second flow path provided with the water-cooled heat exchanger are switched, air cooling can be performed according to fluctuations in the cooling water temperature, fluctuations in the temperature around the apparatus, and fluctuations in the output of the air conditioning equipment. Since the heat exchange medium is guided to either the heat exchanger or the water-cooled heat exchanger to exchange heat, the air conditioner having the air-cooled and water-cooled heat exchangers can be operated efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the overall configuration of the apparatus will be described, and then classified according to each control mode. FIG. 1 is a schematic view showing a hybrid air conditioner. In FIG. 1, the code | symbol 1 shows the internal structure of the outdoor unit 1 connected with the fan coil unit 11 as an air conditioning apparatus with which indoors are mounted | worn. This outdoor unit 1 includes an electromagnetic four-way valve 2, an expansion valve 3, an air-cooled heat exchanger 5, a four-way valve disposed on a flow path 4 that connects the four-way valve 2 and the expansion valve 3. The outdoor unit 1 and the fan coil unit 11 can be separated by closing the accumulator 8, the low-pressure on-off valve 9, the four-way valve 2 and the expansion valve 3 on the low-pressure channel 7 connecting the compressor 2 and the compressor 6. Stop valves 10A and 10B, a water-cooled heat exchanger 20, and a cooling water passage 30 for circulating cooling water through the water-cooled heat exchanger 20 are provided. A cooling fan 18 that is rotationally driven by a drive motor 19 is provided at a portion facing the air-cooled heat exchanger 5. A known silencer 13 and a pressure opening / closing valve 14 are provided in the high-pressure flow path 12 connecting the compressor 6 and the four-way valve 2. Each of these components is a component of the refrigeration cycle and an air-cooled heat exchanger that performs heat exchange of the heat exchange medium circulating in the fan coil unit 11 and the flow path 4 to perform cooling and heating. The heat exchange medium is filled in the flow path 4 in an amount capable of obtaining optimum performance. As heat exchange media, CFC R-12, HCFC R-22, R-123, HFC R-134a, R-407 (mixed HFC-32, 125d, 134a), R410A (HFC-32) , 125 mixing) is used.

  The water-cooled heat exchanger 20 is disposed in the flow path 4A connected to the flow path 4 so as to bypass the air-cooled heat exchanger 5. The flow path 4 </ b> A constitutes a second flow path that guides the heat exchange medium flowing in the flow path 4 to the water-cooled heat exchanger 20. An air-cooled heat exchanger 5 is disposed in a flow path 4B serving as a bypass flow path with respect to the water-cooled heat exchanger 20, and constitutes a first flow path. Electromagnetic valves 22 and 23 are provided in the flow path 4A located upstream and downstream of the water-cooled heat exchanger 20, and electromagnetic valves 24 and 25 are provided in the flow path 4B located upstream and downstream of the water-cooled heat exchanger 5. Are arranged respectively. These solenoid valves close the respective flow paths in the off state to stop the flow of the heat exchange medium into the water-cooled heat exchanger 20 and the air-cooled heat exchanger 5, respectively, and open the respective flow paths in the on state to open the respective heat exchangers. The heat exchange medium is flowed into each of the two.

  The water-cooled heat exchanger 20 includes an inlet 20A that introduces cooling water into the inside thereof, and an outlet 20B that discharges the cooling water that has passed through the inside and exchanged heat. One end 34A of a water supply passage 34 constituting the cooling water passage 30 is connected to the inlet 20A, and one end 37A of a drain passage 37 constituting the cooling water passage 30 is connected to the discharge port 20B. Cooling water is supplied to the water supply passage 34 from a water supply pump (not shown) connected to the other end 34B side. This cooling water is introduced into the water-cooled heat exchanger 20 and discharged from the drainage channel 37. That is, the cooling water flow path 30 is a flow path for circulating cooling water to the water-cooled heat exchanger 20, and the water-cooled heat exchanger 20 uses the circulating water to flow a heat exchange medium that circulates between the fan coil unit 11. It is configured to cool or heat. In this embodiment, the feed water pump that sends the cooling water is appropriately turned on / off by another system.

A flow rate detection sensor 32 as a flow rate detection means for detecting the flow rate of the cooling water to the water-cooled heat exchanger 20 and the pressure of the cooling water in the cooling water channel 30 toward the water-cooled heat exchanger 20 are supplied to the water supply flow channel 34. A water pressure detection sensor 33 as a water pressure detection means to detect and an electromagnetic valve 31 as an opening / closing means for opening and closing the water supply flow path 34 are provided. The water pressure detection sensor 33 is disposed in the vicinity of the water supply port 33, and the flow rate detection sensor 32 is disposed in the cooling water flow path 30 between the electronic valve 31 and the water pressure detection sensor 33.
The drainage flow path 37 includes a drainage temperature sensor 35 as a drainage temperature detection means for detecting the discharge temperature of the cooling water heat-exchanged by the water-cooled heat exchanger 20, and the pressure of the cooling water discharged from the water-cooled heat exchanger 20. A water pressure detection sensor 36 is provided as water pressure detection means for detecting the water pressure. The discharge temperature sensor 35 is disposed in the vicinity of the discharge port 20B, and the flow rate detection sensor 36 is disposed in the drain flow path 37 on the downstream side of the discharge temperature sensor.

  The flow path 7 located on the primary side of the accumulator 8 and the water-cooled heat exchanger 20 are connected and communicated with each other through a third flow path 26. The third flow path 26 is a medium recovery passage for introducing the heat exchange medium in the water-cooled heat exchanger 20 into the accumulator 8 when the electromagnetic valves 22 and 23 are off and the electromagnetic valves 24 and 25 are on. Configure. The flow path 7 positioned on the primary side of the accumulator 8 and the air-cooled heat exchanger 5 are connected and communicated with each other through a fourth flow path 27. The fourth flow path 27 is a medium recovery passage for introducing the heat exchange medium in the air-cooled heat exchanger 5 into the accumulator 8 when the electromagnetic valves 22 and 23 are on and the electromagnetic valves 24 and 25 are off. Configure. The third and fourth flow paths 26 and 27 are provided with electromagnetic on-off valves 28 and 29 as opening / closing means that can open and close the flow paths, respectively. That is, the electromagnetic valves 22 and 33 and the electromagnetic valves 24 and 25 constitute switching means for switching the flow path 4A and the flow path 4B according to the on / on state.

  The casing 100 is provided with an outside air temperature detection sensor 38 as outside air temperature detecting means for detecting the outside air temperature as the ambient temperature of the hybrid air conditioner. It is preferable that the outside air temperature detection sensor 38 is disposed at a portion that is not affected by the airflow generated by the rotation of the fan 18 because it is less affected by the hot airflow that is heat-exchanged by the air-cooled heat exchanger 5.

  The on / off control of the drive motor 19, the electromagnetic valves 22, 23, 24, 25, the open / close valves 28, 29 and the electromagnetic valve 31 is configured to be controlled by the control means 40 shown in FIG. 2. Although not shown, the control means 40 includes a CPU (central processing unit), an I / O (input / output) port, a ROM (read-only storage device), a RAM (read / write storage device), a timer, and the like. These are configured by a known computer having a configuration connected by a signal bus. On the input side of the control means 40, the flow rate detection sensor 32, the water pressure detection sensors 33 and 36, the discharge temperature sensor 35, the outside air temperature detection sensor 38, the operation unit 50 of the device, and the output fluctuation detection for detecting the output fluctuation of the air conditioner. A frequency detection sensor 58 as a means is connected. In this embodiment, a known thermistor is used for each temperature sensor. However, other configurations may be used. As shown in FIG. 3, the operation unit 50 includes a cooling switch 51 that is operated when selecting a cooling mode that is a cooling cycle, a heating switch 52 that is operated when selecting a heating mode that is a heating cycle, and a dehumidification cycle. A dehumidifying switch 53 that is operated when selecting a dehumidifying mode and a power switch 54 for turning on / off the power are provided.

  On the output side of the control means 40, the four-way valve 2, the electromagnetic valves 22 to 25, the on-off valves 28 and 29, the electromagnetic valve 31, the compressor 6 and the drive motor 19 are electrically connected. The compressor 6 is connected to the control means 40 via the inverter control unit 59. The inverter control unit 59 converts the frequency to variably adjust the output of the fan coil unit 11 and controls the rotational speed of the compressor 6. The frequency detection sensor 58 detects the frequency converted by the inverter control unit 59.

  In the ROM of the control means 40, the solenoid valves 22, 23, the on-off valve 29, the solenoid valve 31, the solenoid valves 24, 25, the on-off valve 28, and various temperature information serving as parameters for turning on / off the drive motor 19 are stored. The pressure WP, the predetermined flow rate R, the predetermined frequency, the first mode to the third mode, the cooling mode and the heating mode are stored in advance. As various temperature information, a first set temperature WT1, a first outside air set temperature T1 used in the cooling mode, a second set temperature WT2 used in the heating mode, and a second outside air set temperature T2 are set. The first set temperature WT1 and the second set temperature WT2 have a relationship of WT1> WT2, and the first outside air set temperature T1 and the second outside air set temperature T2 have a relationship of T1> T2. As the predetermined frequency, the set frequency used for the cooling mode is set to the first set frequency S1 serving as the first predetermined information and the second set frequency S2 serving as the second predetermined information used in the heating mode, respectively. Has been. In the present embodiment, the first set frequency S1 and the second set frequency S2 are S1 <S2.

  The control means 40 is set with a routine for executing the basic operation process shown in FIG. 4 and any mode from the first mode to the third mode, or a combination of these modes. Each routine includes a routine for executing a cooling operation process that starts when the cooling switch 51 is operated, and a heating operation process that starts when the heating switch 52 is operated. In this embodiment, the four-way valve 2 is normally turned off. When in this state, the flow path 4 is communicated so as to move the heat exchange medium in the direction indicated by the solid line in FIG. It switches so that the flow path 4 may be connected so that a heat exchange medium may be moved to the arrow direction shown with a broken line in FIG. The four-way valve 2 is controlled to be in an off state during the cooling mode and the dehumidifying mode and to be turned on during the heating mode.

  Hereinafter, the control operation by the control device 40 will be described. In FIG. 4, in the basic operation process, when the power switch 54 is operated and the power is turned on in step H1, the operation mode is determined in step H2. In this embodiment, when the operation mode is cooling in step H2, the process proceeds to step H3 and the cooling operation process is performed. In step H2, when the operation mode is not cooling, the process proceeds to step H4. If the operation mode is heating in step H4, the process proceeds to step H5 and the heating operation process is performed. If the operation mode is not cooling in step H4, the process proceeds to step H6. When the operation mode is dehumidification in step H6, the process proceeds to step H7 and the dehumidification operation process is performed. Even if each operation process is executed, the apparatus is stopped when the power switch 54 is operated and the power is turned off. Since the dehumidifying operation is a form of cooling, the dehumidifying operation process is in the same process as the cooling operation process, and the description of the processing operation during dehumidification is saved.

(First form)
This form shows the case where the cooling water mode that is the first mode is set in the control means 40. In the first mode, the temperature change of the cooling water is used as a parameter for switching the flow path, and the following control is executed.
When the cooling operation is selected in step H2 of FIG. 4, the cooling operation process in the cooling water mode of FIG. 5 is started. In this process, it is determined in step A1 whether or not the operation mode has been changed. Here, it is determined whether or not the cooling mode set by the operation unit 50 has been changed to another operation mode, and in the case of the cooling mode, the process proceeds to step A2. When the operation mode is changed to other than cooling in step A1, the cooling operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step A2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to step A3. In step A3, the drainage temperature WT detected by the drainage temperature sensor 35, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 are read, and the process proceeds to step A4. . In step A4, the drain temperature information WT from the drain temperature sensor 35 is compared with the first set temperature WT1, and if the drain temperature information WT is lower than the first set temperature WT1, the water-cooled heat exchanger 20 Proceed to step A5 at a temperature at which heat exchange is possible. In step A5, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to step A6 assuming that there is no flow reduction due to scale adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step A6, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step A7, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step A4.

  When the water cooling mode is activated in step A7, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, when the drainage temperature information WT is higher than the first set temperature WT1 in step A4, it is determined that the water-cooled heat exchanger 20 is clogged or the cooling water temperature is abnormal, and the process proceeds to step A8. move on. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step A9 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 And return to Step A4.
In step A5, when the flow rate information WR is less than the predetermined flow rate R, it is assumed that the cooling water of the amount necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step A9 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 Let
When the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step A6, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step A8. 31 is turned off, the cooling water flow path 30 is closed, the cooling water supply to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step A9. Thus, steps A5 and A6 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step A9 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  If heating operation is selected in step H4 of FIG. 4, the heating operation process in the cooling water mode of FIG. 6 is started. In this process, it is determined in step A11 whether or not there is an operation mode conversion. Here, it is determined whether or not the switch of the operation unit 50 has been operated to change to another operation mode, and in the heating mode, the process proceeds to step A12. If the operation mode is changed to other than heating in Step A1, the heating operation process is not continued and the process returns to Step H2 in FIG. 4 to confirm the operation mode again.

  In Step A12, the four-way valve 2 is turned on, the flow path 4 is switched from the cooling flow path to the heating flow path, and the process proceeds to Step A13. In step A13, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water passage 30 and the water-cooled heat exchanger 20, and the process proceeds to step A14. In step A14, the drainage temperature WT detected by the drainage temperature sensor 35, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 are read, and the process proceeds to step A15. . In step A15, the drainage temperature information WT from the drainage temperature sensor 35 is compared with the second set temperature WT2, and if the drainage temperature information WT is higher than the second set temperature WT2, the water-cooled heat exchanger 20 Proceed to step A16 at a temperature at which heat exchange is possible. In step A16, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to Step A17 on the assumption that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step A17, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the pressure difference does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step A18, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step A15.

  When the water cooling mode is activated in step A18, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. However, since the four-way valve 2 is turned on, when performing a heating operation, the heat exchange medium flows into the flow path 7 from the fan coil unit 11 via the stop valve 10B, and in the direction of the arrow indicated by the broken line in FIG. The four-way valve 2 returns to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, if the drainage temperature information WT is lower than the first set temperature WT2 in step A15, it is determined that the water-cooled heat exchanger 20 is clogged or the cooling water temperature is abnormal, and the process proceeds to step A19. move on. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step A20 And return to Step A15.
In step A16, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step A20 Let
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step A17, the pressure increases due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step A19. 31 is turned off, the cooling water flow path 30 is closed, the cooling water supply to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step A20. Thus, Steps A16 and A17 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step A20 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

That is, during cooling operation in the cooling water mode, when the temperature information WT from the waste water temperature detection sensor 35 is higher than the preset first set temperature WT1, the heat exchange efficiency by the cooling water is low. As described above, the flow path through which the heat exchange medium flows is switched from the second flow path 4A having the water-cooled heat exchanger 20 to the first flow path 4B having the air-cooled heat exchanger 5. Further, during the heating operation in the cooling water mode, when the temperature information WT from the drainage temperature detection sensor 35 is lower than the preset second set temperature WT2, the heat exchange efficiency by the cooling water is low. As described above, the flow path through which the heat exchange medium flows is switched from the second flow path 4A having the water-cooled heat exchanger 20 to the first flow path 4B having the air-cooled heat exchanger 5.
For this reason, when the heat exchange efficiency of the water-cooled heat exchanger 20 is reduced, the heat exchange medium circulating in the flow path 4 is guided to the air-cooled heat exchanger 5 and exchanges heat. It is possible to efficiently operate the air conditioner 1 having the heat exchanger. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(Second form)
This form shows a case where the control unit 40 is set to the outside air temperature mode that is the second mode. The second mode uses a change in the outside air temperature as a parameter for switching the flow path, and executes the following control.
When the cooling operation is selected in step H2 in FIG. 4, the cooling operation process in the outside air temperature mode in FIG. 7 is started. In this process, it is determined in step B1 whether or not the operation mode has been changed. If the cooling mode remains, the process proceeds to step B2. If the operation mode has been changed to other than cooling in step B1, the air handling process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step B2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to step B3. In step B3, information on the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 is read, and the flow proceeds to step B4. move on. In step B4, the waste water temperature information T from the waste water temperature sensor 35 is compared with the first set temperature W1, and if the outside air temperature information T is lower than the first outside air set temperature T1, the air-cooled heat exchanger 20 is used. The temperature at which heat exchange can be sufficiently performed is advanced to step B5. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step B6 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 And return to Step B5.

  When the air cooling mode is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  On the other hand, when the outside air temperature information T is higher than the first outside air set temperature T1 in step B4, the heat exchange by the water-cooled heat exchanger 20 is more efficient than the heat exchange by the air-cooled heat exchanger 5. To step B7. In step B7, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to Step B8 assuming that the flow rate of cooling water required for heat exchange is supplied to the water-cooled heat exchanger 20 without reducing the flow rate due to scale adhesion. In step B8, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step B9, the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to step B5.

In step B7, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the cooling water of the amount necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step B6 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 Let
If the water pressure information WP1, WP2 exceeds the predetermined pressure P in step B8, the pressure rises due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state proceeds to step B5, and the solenoid valve 31 is turned off. Then, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step B6. Thus, steps B7 and B8 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the water cooling mode is activated in step B7, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

  If heating operation is selected in step H4 of FIG. 4, the heating operation process in the outside air temperature mode of FIG. 8 is started. In this process, it is determined in step B11 whether or not there is an operation mode conversion, and if the heating mode is maintained, the process proceeds to step B12. If the operation mode is changed to other than heating in Step B11, the heating mode process is not continued and the process returns to Step H2 in FIG. 4 to confirm the operation mode again.

  In Step B12, the four-way valve 2 is turned on, the flow path 4 is switched from the cooling flow path to the heating flow path, and the process proceeds to Step B13. In Step B13, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water passage 30 and the water-cooled heat exchanger 20, and the process proceeds to Step B14. In step B14, information on the outside air temperature T detected by the outside air temperature detection sensor 35, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 is read, and the process proceeds to step B15. move on. In step B16, the electromagnetic valve 31 is turned off to close the cooling water flow path 30 to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the process proceeds to step B17 to perform cooling using the air-cooled heat exchanger 5. The system is operated and the process returns to step B15.

  When the air cooling mode is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  On the other hand, if the outside air temperature information T is higher than the second outside air set temperature T2 in step B15, the heat exchange by the water-cooled heat exchanger 20 is more efficient than the heat exchange by the air-cooled heat exchanger 5. To step B18. In step B18, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to Step B19 on the assumption that the flow rate of cooling water required for heat exchange is supplied to the water-cooled heat exchanger 20 without reducing the flow rate due to scale adhesion. In step B19, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the pressure difference does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step B20, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step B15.

In step B18, when the flow rate information WR is less than the predetermined flow rate R, it is assumed that the cooling water of the amount necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air cooling system for cooling using the air-cooling heat exchanger 5 is operated by proceeding to Step B17 Let
If the pressure difference between the water pressure information WP1 and WP2 exceeds the predetermined pressure P in step B19, the pressure rises due to the scale adhering in the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step B16. 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step B17. Thus, steps B18 and B19 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the water cooling mode is activated in step B20, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. However, since the four-way valve 2 is turned on, when performing a heating operation, the heat exchange medium flows into the flow path 7 from the fan coil unit 11 via the stop valve 10B, and in the direction of the arrow indicated by the broken line in FIG. The four-way valve 2 returns to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

In other words, during the cooling operation in the outside air temperature mode, when the temperature information T from the outside air temperature detection sensor 38 is higher than the preset first outside air set temperature T1, the heat exchange efficiency by air cooling is low. As described above, the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 5. Further, during the heating operation in the outside air temperature mode, when the temperature information T from the outside air temperature detection sensor 38 is lower than the preset second outside air set temperature T2, the heat exchange efficiency by air cooling is lowered. As described above, the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20.
For this reason, when the heat exchange efficiency of the air-cooled heat exchanger 5 is reduced, the heat exchange medium circulating in the flow path 4 is guided by the water-cooled heat exchanger 20 to be heat-exchanged. It is possible to efficiently operate the air conditioner 1 having the heat exchanger. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(Third form)
This form shows the case where the inverter mode that is the third mode is set in the control means 40. The third mode is a mode in which the frequency change of the inverter control unit 59 is used as a parameter for switching the flow path, and the following control is executed.
When the cooling operation is selected in Step H2 of FIG. 4, the cooling operation process in the inverter mode of FIG. 9 is started. In this process, it is determined in step C1 whether or not the operation mode has been changed. If the cooling mode remains, the process proceeds to step C2. When the operation mode is changed to other than cooling in step C1, the cooling operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In Step C2, the electromagnetic valve 31 is turned on to allow cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to Step C3. The compressor 6 is turned on and the process proceeds to Step C4. In Step C4, the inverter frequency S detected by the frequency detection sensor 58, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 are read, and the process proceeds to Step C5. . In step C5, the inverter frequency information S from the frequency detection sensor 58 and the first set frequency S1 are compared. If the inverter frequency information S is lower than the first set frequency S1, the air-cooled heat exchanger 20 Proceed to Step C6 on the assumption that heat exchange is sufficient and the load is not high. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air cooling system for operating the air-cooling heat exchanger 5 is operated by proceeding to Step C7 And return to Step C5.

  In this embodiment, when the air cooling mode is activated, the compressor 6 is already activated, so that the solenoid valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the solenoid valves 22 and 23 are opened and closed. The valve 29 is turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  On the other hand, if the inverter frequency information S is higher than the first set frequency S1 in step C5, heat exchange by the water-cooled heat exchanger 20 is more efficient than heat exchange by the air-cooled heat exchanger 5. The process proceeds to step C8. In Step C8, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to Step C9 assuming that the flow rate of cooling water required for heat exchange is supplied to the water-cooled heat exchanger 20 without reducing the flow rate due to scale adhesion. In Step C9, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP, and if the pressure difference does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. The process proceeds to step C10 in a normal state where there is no pressure increase due to the above, and the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to step C5.

In step C8, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water required for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air cooling system for operating the air-cooling heat exchanger 5 is operated by proceeding to Step C7 Let
If the water pressure information WP1, WP2 exceeds the predetermined pressure P in step C9, the pressure rises due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step C6, and the solenoid valve 31 is turned on. The cooling water flow path 30 is turned off and the cooling water supply to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step C7. Thus, steps C8 and C9 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the water cooling mode is activated in step C10, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

  If heating operation is selected in step H4 of FIG. 4, the heating operation process in the inverter mode of FIG. 10 is started. In this process, it is determined in step C11 whether or not there is an operation mode conversion, and if the heating mode is maintained, the process proceeds to step C12. If the operation mode is changed to other than heating in Step C11, the heating mode process is not continued and the process returns to Step H2 in FIG. 4 to confirm the operation mode again.

  In Step C12, the four-way valve 2 is turned on, the flow path 4 is switched from the cooling flow path to the heating flow path, and the process proceeds to Step C13. In Step C13, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water passage 30 and the water-cooled heat exchanger 20, and the process proceeds to Step C14. In step C14, the compressor 6 is turned on, and the process proceeds to step C15, where the inverter frequency S detected by the frequency detection sensor 58, the water pressures WP1, WP2 detected by the water pressure detection sensors 33, 36, and the flow rate WR detected by the flow rate detection sensor 32 are detected. Each information is read, and the process proceeds to Step C16. Then, in Step C16, the electromagnetic valve 31 is turned off to close the cooling water flow path 30 and the supply of the cooling water to the water-cooled heat exchanger 20 is stopped. Then, the process proceeds to Step C17 to perform air cooling using the air-cooled heat exchanger 5 The system is operated and the process returns to Step C15.

  When the air cooling mode is activated, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since it is a heating mode, the four-way valve 2 is turned on, and since it is also an inverter mode, the compressor 6 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  On the other hand, when the inverter frequency information S is higher than the first set frequency S1 in step C16, the compressor 6 becomes a heavy load, and heat exchange by the water-cooled heat exchanger 20 is performed rather than heat exchange in the air-cooled heat exchanger 5. It is considered that the efficiency is higher, and the process proceeds to Step C19. In step C19, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to Step C20 on the assumption that the flow rate of cooling water required for heat exchange is supplied to the water-cooled heat exchanger 20 without reducing the flow rate due to scale adhesion. In step C20, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step C21, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step C16.

In step C19, when the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the solenoid valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the air cooling system for operating the air-cooling heat exchanger 5 is operated by proceeding to Step C18. Let
If the pressure difference between the water pressure information WP1 and WP2 exceeds the predetermined pressure P in step C20, the pressure increases due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step C17. 31 is turned off, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in Step C18. Thus, steps C19 and C20 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the water cooling mode is activated in step C21, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. However, since the four-way valve 2 is turned on, when performing a heating operation, the heat exchange medium flows into the flow path 7 from the fan coil unit 11 via the stop valve 10B, and in the direction of the arrow indicated by the broken line in FIG. The four-way valve 2 returns to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

That is, during the cooling operation in the inverter mode, when the inverter frequency S, which is output information from the frequency detection sensor 58, is higher than the first set frequency S1, which is set in advance, the heat exchange efficiency is higher than the heat exchange efficiency by air cooling. Heat exchange is more efficient, and the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 5. Further, during the heating operation in the inverter mode, when the inverter frequency S that is the output information from the frequency detection sensor 58 is higher than the preset second set frequency S2, the heat exchange efficiency by air cooling is lowered. As a matter of course, the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20.
For this reason, the heat exchange medium circulating in the flow path 4 is guided to the water-cooled heat exchanger 20 when the heat exchange efficiency of the air-cooled heat exchanger 5 is reduced, so that heat exchange is performed. The air conditioner 1 having a heat exchanger can be operated efficiently. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(4th form)
This form shows the case where the first combined mode in which the cooling water mode that is the first mode and the inverter mode that is the third mode is combined is set in the control means 40. In the first combined mode, the temperature change of the cooling water and the change of the inverter frequency are used as parameters for switching the flow path, and the following control is executed.
When the cooling operation is selected in step H2 in FIG. 4, the cooling operation process in the first combined mode in FIG. 11 is started. In this process, it is determined in step D1 whether or not the operation mode has been changed. When the operation mode is not changed and the cooling mode is maintained, the process proceeds to step D2. If the operation mode is changed to other than cooling in step D2, the cooling maneuver process is not continued, and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step D2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to step D3. In step D3, the drainage temperature WT detected by the drainage temperature sensor 35, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 are read, and the process proceeds to step D4. . In step D4, the drain temperature information WT from the drain temperature sensor 35 is compared with the first set temperature WT1, and if the drain temperature information WT is lower than the first set temperature WT1, the water-cooled heat exchanger 20 Proceed to step D5 at a temperature at which heat exchange is possible. In Step D, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 may be damaged. The flow proceeds to Step D6 assuming that there is no flow reduction due to scale adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step D6, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP, and if the differential pressure is lower than the predetermined pressure WP, the pressure due to the scale adhering in the water-cooled heat exchanger 20 In a normal state where there is no increase, the process proceeds to Step D7, the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to Step D4.

  When the water cooling mode is activated in step D7, as described above, the solenoid valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the solenoid valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. State. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction of the arrow indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium existing in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is caused by the negative pressure of the accumulator 8. It is collected in the accumulator 8. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, if the drainage temperature information WT is higher than the first set temperature WT1 in step D4, it is determined that the water-cooled heat exchanger 20 is clogged or the cooling water temperature is abnormal, and the process goes to step D8. move on. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step D9 And proceed to Step D10.
In step D5, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water required for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step D9 Let
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step D6, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step D8. 31 is turned off, the cooling water flow path 30 is closed to stop the supply of cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step D9. Thus, steps D5 and D6 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

When the air cooling mode in step D9 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.
After the operation in the air cooling mode, the inverter frequency information S from the frequency detection sensor 58 is read in step D10, the inverter frequency information S is compared with the first set frequency S1 in step D11, and the inverter frequency information S is If the frequency is higher than the set frequency S1, the compressor 6 is heavily loaded and the heat exchange by the water-cooled heat exchanger 20 is considered to be more efficient than the heat exchange by the air-cooled heat exchanger 5, and the process proceeds to Step D7. When the water-cooling mode is selected and the inverter frequency information S is lower than the first set frequency S1, the air-cooling heat exchanger 5 is assumed to have a low load and the process returns to step D4.

  When the heating operation is selected in step H4 in FIG. 4, the heating operation process in the first combined mode in FIG. 12 is started. In this process, it is determined in step D21 whether or not there is a change in the operation mode, and in the case of the heating mode, the process proceeds to step D22. If the operation mode is changed to other than heating in step D21, the heating operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step D22, the four-way valve 2 is turned on to switch the flow path 4 from the cooling flow path to the heating flow path, and the process proceeds to step D23. In Step D23, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to Step D24. In step D245, the drainage temperature WT detected by the drainage temperature sensor 35, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 are read, and the process proceeds to step D25. . In step D25, the drainage temperature information WT from the drainage temperature sensor 35 is compared with the second set temperature WT2, and if the drainage temperature information WT is higher than the second set temperature WT2, the water-cooled heat exchanger 20 Proceed to step D26 at a temperature at which heat exchange is possible. In step D26, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to Step D27 assuming that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step D27, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step D28, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step D25.

  When the water cooling mode is activated in step D28, the solenoid valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the solenoid valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. Since the four-way valve 2 is already turned on, when heating operation is performed, the heat exchange medium flows from the fan coil unit 11 into the flow path 7 through the stop valve 10B, and in the direction indicated by the broken line in FIG. The valve 2 is returned to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, when the drainage temperature information WT is lower than the second set temperature WT2 in step D25, it is determined that the water-cooled heat exchanger 20 is clogged or the cooling water temperature is abnormal, and the process proceeds to step D29. move on. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water cooling type heat exchanger 20 is stopped, and the air cooling system for proceeding to step D30 and performing the cooling using the air cooling type heat exchanger 5 is operated. Then, the process proceeds to Step D31.
In step D26, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. The air cooling system for turning off the electromagnetic valve 31 and closing the cooling water flow path 30 to stop the supply of the cooling water to the water cooling type heat exchanger 20 and proceeding to step D30 to perform cooling using the air cooling type heat exchanger 5 To work.
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step D27, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step D29. 31 is turned off, the cooling water flow path 30 is closed, the cooling water supply to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step D30. Thus, steps D26 and D27 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step D30 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  After the operation in the air cooling mode, the inverter frequency information S from the frequency detection sensor 58 is read in step D31, the inverter frequency information S is compared with the second set frequency S2 in step D32, and the inverter frequency information S is When the frequency is higher than the set frequency S2 of 2, the compressor 6 becomes a heavy load, and the heat exchange by the water-cooled heat exchanger 20 is regarded as higher efficiency than the heat exchange by the air-cooled heat exchanger 5, and the process proceeds to Step D28. When the water-cooling mode is selected and the inverter frequency information S is lower than the second set frequency S2, the load of the air-cooling heat exchanger 5 is assumed to be low, and the process returns to step D25.

  That is, during the cooling operation in the combined mode 1, when the temperature information WT from the drainage temperature detection sensor 35 is higher than the preset first set temperature WT1, the heat exchange efficiency by the cooling water is low. As described above, the flow path through which the heat exchange medium flows is switched from the second flow path 4A having the water-cooled heat exchanger 20 to the first flow path 4B having the air-cooled heat exchanger 5. Further, during the heating operation in the combined mode 1, when the temperature information WT from the drainage temperature detection sensor 35 is lower than the preset second set temperature WT2, it is assumed that the heat exchange efficiency by the cooling water is lowered. The flow path through which the heat exchange medium flows is switched from the second flow path 4A having the water-cooled heat exchanger 20 to the first flow path 4B having the air-cooled heat exchanger 5. Further, when the load on the compressor 6 becomes high during cooling or heating, the flow is made so that heat exchange can be performed using the water-cooled heat exchanger 20 instead of the air-cooled heat exchanger 5 for energy saving. Change the path. For this reason, the heat exchange medium circulating in the flow path 4 is guided to the air-cooled heat exchanger 5 when the heat-exchange efficiency of the water-cooled heat exchanger 20 is reduced, and the heat-exchange efficiency of the air-cooled heat exchanger 5 is reduced. Since the water-cooled heat exchanger 20 guides the heat exchange, the air conditioner 1 having the air-cooled and water-cooled heat exchangers can be operated efficiently. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(5th form)
This form shows the case where the second combined mode in which the outside air temperature mode that is the second mode and the inverter mode that is the third mode is combined is set in the control means 40. In the second combined mode, the change in the outside air temperature and the change in the inverter frequency are used as parameters for switching the flow path, and the following control is executed.
When the cooling operation is selected in Step H2 of FIG. 4, the cooling operation process in the second combined mode of FIG. 13 is started. In this process, it is determined in step E1 whether or not the operation mode has been changed. When the operation mode is not changed and the cooling mode is maintained, the process proceeds to step E2. If the operation mode has been changed to other than cooling in step E2, the cooling maneuver process is not continued, and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step E2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to step E3. In step E3, information on the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 is read, and the flow proceeds to step E4. move on. In step E4, the outside air temperature information T from the outside air temperature detection sensor 38 is compared with the first outside air set temperature T1, and if the outside air temperature information T is higher than the first outside air set temperature T1, the air cooling heat It is considered that the load is high with respect to the exchanger 5, and the process proceeds to step E <b> 5 to exchange heat with the water-cooled heat exchanger 20. In step E5, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to step E6 assuming that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step E6, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP, and if the pressure difference is lower than the predetermined pressure WP, the pressure due to the scale adhering in the water-cooled heat exchanger 20 In a normal state where there is no increase, the process proceeds to step E7, the water cooling mode using the water cooling heat exchanger 20 is operated, and the process returns to step E4.

  When the water cooling mode is activated in step E7, as described above, the solenoid valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the solenoid valves 24, 25, the on-off valve 28 and the drive motor 19 are turned off. State. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction of the arrow indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium existing in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is caused by the negative pressure of the accumulator 8. It is collected in the accumulator 8. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, if the outside air temperature information T is lower than the first outside air set temperature T1 in step E4, a load that can be handled by the air-cooled heat exchanger 5 is determined, and the process proceeds to step E8. Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step E9 And go to Step E10.
In step E5, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is cut off, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step E9 Let
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step E6, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step E8. 31 is turned off, the cooling water flow path 30 is closed to stop the supply of cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step E9. Thus, steps E5 and E6 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

When the air cooling mode of step E9 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.
After the operation in the air cooling mode, in step E10, the inverter frequency information S from the frequency detection sensor 58 is read. In step E11, the inverter frequency information S is compared with the first set frequency S1, and the inverter frequency information S is the first. If the frequency is higher than the set frequency S1, the compressor 6 is heavily loaded, and the heat exchange using the water-cooled heat exchanger 20 is considered to be more efficient than the heat exchange in the air-cooled heat exchanger 5, and the process proceeds to step E7. When the water-cooling mode is selected and the inverter frequency information S is lower than the first set frequency S1, the load on the air-cooling heat exchanger 5 is assumed to be low, and the process returns to step E4.

  If heating operation is selected in step H4 of FIG. 4, the heating operation process in the second combined mode of FIG. 14 is started. In this process, it is determined in step E21 whether or not there is an operation mode conversion, and in the case of the heating mode, the process proceeds to step E22. If the operation mode is changed to other than heating in step E21, the heating operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step E22, the four-way valve 2 is turned on to switch the flow path 4 from the cooling flow path to the heating flow path, and the process proceeds to step E23. In Step E23, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to Step E24. In step E245, information on the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1 and WP2 detected by the water pressure detection sensors 33 and 36, and the flow rate WR detected by the flow rate detection sensor 32 is read. move on. In step E25, the outside air temperature information T from the outside air temperature detection sensor 38 and the second outside air set temperature T2 are compared. If the outside air temperature information T is higher than the second outside air set temperature T2, the air-cooled heat Assuming that the exchanger 5 has a high load, the process proceeds to step E26 to exchange heat with the water-cooled heat exchanger 20. In step E26, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to step E27 assuming that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step E27, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step E28, the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to step E25.

  When the water cooling mode is activated in step E28, the solenoid valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the solenoid valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. Since the four-way valve 2 is already turned on, when heating operation is performed, the heat exchange medium flows from the fan coil unit 11 into the flow path 7 through the stop valve 10B, and in the direction indicated by the broken line in FIG. The valve 2 is returned to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, if the outside air temperature information T is lower than the second outside air set temperature T2 in step E25, the load that can be handled by the air-cooled heat exchanger 5 is determined, and the process proceeds to step E29. In step E29, the electromagnetic valve 31 is turned off to close the cooling water flow path 30 to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the process proceeds to step E30 to perform cooling using the air-cooled heat exchanger 5. The operation proceeds to step E31.
In step E26, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water required for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. The air cooling system for turning off the electromagnetic valve 31 and closing the cooling water flow path 30 to stop the supply of the cooling water to the water cooling type heat exchanger 20 and proceeding to step E30 to perform cooling using the air cooling type heat exchanger 5 To work.
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step E27, the pressure rises due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step E29. 31 is turned off, the cooling water flow path 30 is closed, the supply of cooling water to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step E30. Thus, steps E26 and E27 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step E30 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  After the operation in the air cooling mode, the inverter frequency information S from the frequency detection sensor 58 is read in step E31, the inverter frequency information S is compared with the second set frequency S2 in step E32, and the inverter frequency information S is If the frequency is higher than the set frequency S2 of 2, the compressor 6 is heavily loaded, and the heat exchange by the water-cooled heat exchanger 20 is regarded as higher efficiency than the heat exchange by the air-cooled heat exchanger 5, and the process proceeds to Step E28. When the water-cooling mode is selected and the inverter frequency information S is lower than the second set frequency S2, the load on the air-cooling heat exchanger 5 is assumed to be low, and the process returns to step E25.

  That is, during the cooling operation in the second combined mode, if the outside air temperature information T from the outside air temperature detection sensor 38 is higher than the preset first outside air set temperature T1, the heat exchange is performed by water cooling. The flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Further, during the heating operation, even when the outside air temperature information T from the outside air temperature detection sensor 38 is lower than the preset second outside air temperature T2, heat exchange by water cooling is more efficient. The flow path through which the medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Also in the case of this embodiment, when the load on the compressor 6 increases during cooling or heating, the heat using the water-cooled heat exchanger 20 instead of the air-cooled heat exchanger 5 is saved for energy saving. The flow path is switched so that it can be exchanged. For this reason, the heat exchange medium circulating in the flow path 4 is guided to the air-cooled heat exchanger 5 when the heat-exchange efficiency of the water-cooled heat exchanger 20 is reduced, and the heat-exchange efficiency of the air-cooled heat exchanger 5 is reduced. Since the water-cooled heat exchanger 20 guides the heat exchange, the air conditioner 1 having the air-cooled and water-cooled heat exchangers can be operated efficiently. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(Sixth form)
This form shows a case where a third combined mode in which the cooling water mode that is the first mode and the outside air temperature mode that is the second mode is combined is set in the control means 40. In the third combined mode, changes in cooling water and outside air temperature are used as parameters for channel switching, and the following control is executed.
When the cooling operation is selected in step H2 in FIG. 4, the cooling operation process in the third combined mode in FIG. 15 is started. In this process, it is determined in step F1 whether or not the operation mode has been changed. When the operation mode is not changed and the cooling mode is maintained, the process proceeds to step F2. If the operation mode is changed to other than cooling in step F2, the cooling operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step F2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to step F3. In step F3, the drainage temperature WT detected by the drainage temperature detection sensor 35, the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1, WP2 detected by the water pressure detection sensors 33, 36, and the flow rate detected by the flow rate detection sensor 32. Each information of WR is read, and the process proceeds to Step F4. In step F4, the drainage temperature information WT from the drainage temperature detection sensor 35 is compared with the first set temperature WT1, and if the drainage temperature information WT is lower than the first set temperature WT1, the water-cooled heat exchanger 20 It is judged that sufficient heat exchange is possible even in the heat exchange at, and the process proceeds to step F5 in order to exchange heat with the water-cooled heat exchanger 20. In step F5, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to Step F6 on the assumption that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step F6, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP, and if the differential pressure is lower than the predetermined pressure WP, the pressure due to the scale adhering in the water-cooled heat exchanger 20 In a normal state where there is no increase, the process proceeds to step F7, the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to step F4.

  When the water cooling mode is activated in step F7, as described above, the solenoid valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the solenoid valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. State. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction of the arrow indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium existing in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is caused by the negative pressure of the accumulator 8. It is collected in the accumulator 8. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

On the other hand, if the drainage temperature information WT is higher than the first set temperature WT1 in step F4, it is determined that the heat exchange by the water-cooled heat exchanger 20 has been reduced, and the cold heat exchanger 5 is to cope with it in step F8. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step F9 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 And proceed to Step F10.
In step F5, when the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the process proceeds to Step F9 to operate the air-cooling system that performs cooling using the air-cooled heat exchanger 5 Let
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step F6, the pressure rises due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step F8. 31 is turned off, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in Step F9. Thus, steps F5 and F6 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

When the air cooling mode in step F9 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.
After the operation in the air cooling mode, in step F10, the outside air temperature information T from the outside air temperature detection sensor 38 is compared with the first outside air set temperature T1, and the outside air temperature information T is higher than the first outside air set temperature T1. In this case, it is considered that the heat exchange by the water-cooled heat exchanger 20 is more efficient than the heat exchange by the air-cooled heat exchanger 5, and the process returns to Step F4, and the outside air temperature information T is obtained from the first outside air set temperature T1. If it is too low, it is determined that efficient heat exchange is possible even by heat exchange by the air-cooled heat exchanger 5, and the process returns to Step F10.

  When the heating operation is selected in step H4 in FIG. 4, the heating operation process in the third combined mode in FIG. 16 is started. In this process, the operation mode is determined in step F21, and if the heating mode is maintained, the process proceeds to step F22. If the operation mode is changed to other than heating in step F21, the heating operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step F22, the four-way valve 2 is turned on to switch the flow path 4 from the cooling flow path to the heating flow path, and the process proceeds to step F23 where the electromagnetic valve 31 is turned on to turn on the cooling water flow path 30 and the water-cooled heat exchanger 20. On the other hand, the cooling water is circulated and the process proceeds to Step F24. In step F24, the drainage temperature WT detected by the drainage temperature detection sensor 35, the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1, WP2 detected by the water pressure detection sensors 33, 36, and the flow rate detected by the flow rate detection sensor 32. Each information of WR is read, and the process proceeds to Step F25. In step F25, the drainage temperature information WT from the drainage temperature detection sensor 35 is compared with the second set temperature WT2, and if the drainage temperature information WT is higher than the second set temperature WT2, the air-cooled heat exchanger 5 Therefore, the process proceeds to step F26 to exchange heat with the water-cooled heat exchanger 20. In step F26, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 is damaged or scaled. The flow proceeds to step F27 assuming that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step F27, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step F28, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step F25.

  When the water cooling mode is activated in step F28, the solenoid valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the solenoid valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. Since the four-way valve 2 is already turned on, when heating operation is performed, the heat exchange medium flows from the fan coil unit 11 into the flow path 7 through the stop valve 10B, and in the direction indicated by the broken line in FIG. The valve 2 is returned to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

When the drainage temperature information WT is lower than the second set temperature WT2 in step F25, a load that can be handled by the air-cooled heat exchanger 5 is determined, and the process proceeds to step F29. In step F29, the electromagnetic valve 31 is turned off to close the cooling water flow path 30 to stop the supply of cooling water to the water-cooled heat exchanger 20, and the process proceeds to step F30 to perform an air-cooling system that performs cooling using the air-cooled heat exchanger 5. Operate and proceed to Step F31.
In step F26, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water required for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. The air cooling system for turning off the electromagnetic valve 31 and closing the cooling water flow path 30 to stop the supply of the cooling water to the water cooling type heat exchanger 20 and proceeding to Step F30 to perform cooling using the air cooling type heat exchanger 5 is proceeded to. Make it work.
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step F27, the pressure rises due to the scale adhering to the water-cooled heat exchanger 20 and an abnormal state occurs and the process proceeds to step F29 and the solenoid valve 31 is reached. Is turned off, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in Step F30. Thus, steps F26 and F27 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step F30 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  After the operation in the air cooling mode, in step F31, the outside air temperature information T from the outside air temperature detection sensor 38 is compared with the second outside air set temperature T2, and the outside air temperature information T is lower than the second outside air set temperature T2. In this case, it is considered that the heat exchange by the water-cooled heat exchanger 20 is more efficient than the heat exchange by the air-cooled heat exchanger 5, and the process returns to Step F25, where the outside air temperature information T is greater than the second set temperature T2. If it is higher, it is considered that efficient heat exchange is possible even by heat exchange by the air-cooled heat exchanger 5, and the process returns to Step F20.

  That is, during the cooling operation in the third combined mode, it is more efficient to perform heat exchange by water cooling when the drainage temperature information WT from the drainage temperature detection sensor 35 is higher than the preset first set temperature WT1. As a result, the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Further, during the heating operation, even when the drainage temperature information WT from the drainage temperature detection sensor 35 is lower than the preset second set temperature WT2, heat exchange by water cooling is more efficient, and the heat exchange medium Is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Also in the case of this embodiment, when the load on the compressor 6 increases during cooling or heating, the heat using the water-cooled heat exchanger 20 instead of the air-cooled heat exchanger 5 is saved for energy saving. The flow path is switched so that it can be exchanged. For this reason, the heat exchange medium circulating in the flow path 4 is guided to the air-cooled heat exchanger 5 when the heat-exchange efficiency of the water-cooled heat exchanger 20 is reduced, and the heat-exchange efficiency of the air-cooled heat exchanger 5 is reduced. Since the water-cooled heat exchanger 20 guides the heat exchange, the air conditioner 1 having the air-cooled and water-cooled heat exchangers can be operated efficiently. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

(7th form)
In this embodiment, the control unit 40 is set with a fourth combined mode in which the coolant mode that is the first mode, the outside air temperature mode that is the second mode, and the inverter mode that is the third mode are combined. Show the case. In the fourth combined mode, changes in cooling water, outside air temperature, and inverter frequency are used as parameters for channel switching, and the following control is executed.
When the cooling operation is selected in step H2 in FIG. 4, the cooling operation process in the fourth combined mode in FIG. 17 is started. In this process, it is determined in step G1 whether or not the operation mode has been changed. When the operation mode is not changed and the cooling mode is maintained, the process proceeds to step G2. If the operation mode is changed to other than cooling in step G2, the cooling operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In Step G2, the electromagnetic valve 31 is turned on to allow the cooling water to flow through the cooling water flow path 30 and the water-cooled heat exchanger 20, and the process proceeds to Step G3. In step G3, the drainage temperature WT detected by the drainage temperature detection sensor 35, the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1, WP2 detected by the water pressure detection sensors 33, 36, and the flow rate detected by the flow rate detection sensor 32. Each information of WR is read, and the process proceeds to Step G4. In step G4, the drain temperature information WT from the drain temperature sensor 35 is compared with the first set temperature WT1, and if the drain temperature information WT is lower than the first set temperature WT1, the water-cooled heat exchanger 20 It is determined that sufficient heat exchange is possible even in the heat exchange at, and the process proceeds to step G5 in order to exchange heat with the water-cooled heat exchanger 20. In step G5, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 or the water-cooled heat exchanger 20 is damaged or scaled. The flow proceeds to Step G6 on the assumption that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step G6, the pressure difference between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the pressure difference is lower than the predetermined pressure WP, the pressure due to the scale adhering to the water-cooled heat exchanger 20 In a normal state where there is no increase, the process proceeds to step G7, the water cooling mode using the water cooling type heat exchanger 20 is operated, and the process returns to step G4.

  When the water cooling mode is activated in step G7, as described above, the solenoid valves 22, 23, the on-off valve 29, and the compressor 6 are turned on, and the solenoid valves 24, 25, the on-off valve 28 and the drive motor 19 are turned off. State. For this reason, in the cooling operation, the heat exchange medium moves from the fan coil unit 11 through the four-way valve 2 in the direction of the arrow indicated by the solid line in FIG. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium existing in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is caused by the negative pressure of the accumulator 8. It is collected in the accumulator 8. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by heat exchange with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the expansion valve 3. At the time of heat exchange with the water-cooled heat exchanger 20, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

When the drainage temperature information WT is higher than the first set temperature WT1 in step G4, it is determined that the heat exchange by the water-cooled heat exchanger 20 has decreased, and the process proceeds to step G8 to cope with the cold heat exchanger 5. . Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step G9 And go to Step G10.
In step G5, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water necessary for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. Proceed to Then, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the supply of the cooling water to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated by proceeding to Step G9 Let
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step G6, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step G8 and the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step G9. Thus, steps G5 and G6 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

When the air cooling mode of step G9 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. For this reason, the second flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the presence in the water-cooled heat exchanger 20 is not used. The heat exchange medium to be recovered is collected in the accumulator 8 by the negative pressure of the accumulator 8, and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.
After the operation in the air cooling mode, in step G10, the outside air temperature information T from the outside air temperature detection sensor 38 is compared with the first outside air set temperature T1, and the outside air temperature information T is higher than the first outside air set temperature T1. In this case, the heat exchange by the water-cooled heat exchanger 20 is considered to be more efficient than the heat exchange by the air-cooled heat exchanger 5, and the process returns to Step G7, and the outside air temperature information T is obtained from the first outside air set temperature T1. Is lower, it is considered that efficient heat exchange is possible even by heat exchange by the air-cooled heat exchanger 5, and the process proceeds to Step G11.

  In step G11, the inverter frequency information S from the frequency detection sensor 58 is read. In step G12, the inverter frequency information S is compared with the first set frequency S1, and the inverter frequency information S is higher than the first set frequency S1. In this case, the compressor 6 becomes a heavy load, the heat exchange by the water-cooled heat exchanger 20 is considered to be more efficient than the heat exchange by the air-cooled heat exchanger 5, and the process proceeds to step G7 to select the water-cooling mode, and the inverter When the frequency information S is lower than the first set frequency S1, the load of the air-cooled heat exchanger 5 is assumed to be low, and the process returns to Step G9, and heat exchange by the air-cooled heat exchanger 5 is continued.

  When the heating operation is selected in step H4 in FIG. 4, the heating operation process in the fourth combined mode in FIG. 18 is started. In this process, the operation mode is determined in step G21, and if the heating mode is maintained, the process proceeds to step G22. If the operation mode is changed to other than heating in step G21, the heating operation process is not continued and the process returns to step H2 in FIG. 4 to confirm the operation mode again.

  In step G22, the four-way valve 2 is turned on to switch the flow path 4 from the cooling flow path to the heating flow path, and the process proceeds to step G23, where the electromagnetic valve 31 is turned on and the cooling water flow path 30 and the water-cooled heat exchanger 20 are turned on. On the other hand, the cooling water is circulated and the process proceeds to Step G24. In step G24, the drainage temperature WT detected by the drainage temperature detection sensor 35, the outside air temperature T detected by the outside air temperature detection sensor 38, the water pressures WP1, WP2 detected by the water pressure detection sensors 33, 36, and the flow rate detected by the flow rate detection sensor 32. Each information of WR is read, and the process proceeds to Step G36. In step G36, the waste water temperature information WT from the waste water temperature detection sensor 35 is compared with the second set temperature WT2, and if the drain temperature information WT is higher than the second set temperature WT2, the air-cooled heat exchanger 5 is used. Therefore, the process proceeds to Step G26 in order to exchange heat with the water-cooled heat exchanger 20. In step G26, the flow rate information WR from the flow rate detection sensor 32 is compared with the predetermined flow rate R. If the flow rate information WR exceeds the predetermined flow rate R, the cooling water flow path 30 and the water-cooled heat exchanger 20 are damaged or scaled. The flow proceeds to Step G27 on the assumption that there is no flow reduction due to adhesion and that the flow required for heat exchange is supplied to the water-cooled heat exchanger 20. In step G27, the differential pressure between the water pressure information WP1 and WP2 from the water pressure detection sensors 33 and 36 is compared with the predetermined pressure WP. If the differential pressure does not reach the predetermined pressure WP, the scale adheres to the water-cooled heat exchanger 20. In step G28, the water cooling mode using the water-cooled heat exchanger 20 is operated, and the process returns to step G25.

  When the water cooling mode is activated in step G28, the electromagnetic valves 22, 23, the on-off valve 29, and the compressor 5 are turned on, and the electromagnetic valves 24, 25, the on-off valve 28, and the drive motor 19 are turned off. Since the four-way valve 2 is already turned on, when heating operation is performed, the heat exchange medium flows from the fan coil unit 11 into the flow path 7 through the stop valve 10B, and in the direction indicated by the broken line in FIG. The valve 2 is returned to the fan coil unit 11 via the stop valve 10A. At this time, since the electromagnetic valves 22 and 23 are turned on and the second flow path 4A is opened, the heat exchange medium is introduced into the water-cooled heat exchanger 20. Further, since the on-off valve 28 is turned off and the on-off valve 29 is turned on, the heat exchange medium present in the air-cooled heat exchanger 5 that is not used because the fourth flow path 27 is opened is negatively charged by the accumulator 8. The accumulator 8 is recovered by pressure. For this reason, the amount of the heat exchange medium that circulates in the flow path 4 is introduced to the water-cooled heat exchanger 20 with the amount substantially the same as that at the time of filling. The introduced heat exchange medium is cooled by exchanging heat with the cooling water in the water-cooled heat exchanger 20 and returned to the fan coil unit 11 via the four-way valve 2. When the heat exchange in the water-cooled heat exchanger 5 is sometimes performed, the drive motor 19 is stopped, so that energy saving and noise such as wind noise generated with the rotation of the fan 18 can be reduced.

If the drain temperature information WT is lower than the second set temperature WT2 in step G25, a load that can be handled by the air-cooled heat exchanger 5 is determined, and the process proceeds to step G29. In step F29, the electromagnetic valve 31 is turned off, the cooling water flow path 30 is closed, the cooling water supply to the water-cooled heat exchanger 20 is stopped, and the air-cooling system that proceeds to step G30 and performs cooling using the air-cooled heat exchanger 5 is established. Operate and proceed to Step G31.
In step G26, if the flow rate information WR is less than the predetermined flow rate R, it is assumed that the amount of cooling water required for heat exchange is not supplied into the water-cooled heat exchanger 20 due to a failure of the water absorption pump or the like. The air cooling system for turning off the electromagnetic valve 31 and closing the cooling water flow path 30 to stop the supply of the cooling water to the water cooling type heat exchanger 20 and proceeding to step G30 to perform cooling using the air cooling type heat exchanger 5 is proceeded to. Make it work.
If the pressure difference between the water pressure information WP1 and WP2 reaches the predetermined pressure P in step G27, the pressure rises due to scale adhesion in the water-cooled heat exchanger 20 and an abnormal state occurs, and the process proceeds to step G29 to proceed to the solenoid valve 31. Is turned off, the cooling water flow path 30 is closed to stop the supply of the cooling water to the water-cooled heat exchanger 20, and the air-cooling system that performs cooling using the air-cooled heat exchanger 5 is operated in step G30. Thus, steps G26 and G27 constitute an abnormality determination unit for the water-cooled heat exchanger 20 and the cooling water supply system.

  When the air cooling mode of step G30 is activated, the compressor 6, the electromagnetic valves 24 and 25, the on-off valve 28, and the drive motor 19 are turned on, and the electromagnetic valves 22, 23 and the on-off valve 29 are turned off. Of course, since the heating mode is set, the four-way valve 2 is turned on. Therefore, the flow path 4A is closed, the first flow path 4B is opened and the flow path switching is performed, and the third flow path 26 is opened and the heat exchange medium existing in the water-cooled heat exchanger 20 that is not used is used. Is collected by the accumulator 8 by the negative pressure of the accumulator 8 and the fan 18 rotates. For this reason, the heat exchange medium that has passed through the compressor 6 and the four-way valve 2 is all guided to the air-cooled heat exchanger 5, and is cooled by being exchanged with air by the air flow generated by the rotation of the fan 18. 3 is returned to the fan coil unit 11.

  After the operation in the air cooling mode, in step G31, the outside air temperature information T from the outside air temperature detection sensor 38 is compared with the second outside air set temperature T2, and the outside air temperature information T is lower than the second outside air set temperature T2. In this case, it is considered that heat exchange by the water-cooled heat exchanger 20 is more efficient than heat exchange by the air-cooled heat exchanger 5, and the process returns to Step G25, and the outside air temperature information T is obtained from the second outside air set temperature T2. Is higher, it is considered that efficient heat exchange is possible even by heat exchange by the air-cooled heat exchanger 5, and the process proceeds to Step G32.

  In step G32, the inverter frequency information S from the frequency detection sensor 58 is read. In step G33, the inverter frequency information S is compared with the second set frequency S2, and the inverter frequency information S is higher than the second set frequency S2. In this case, the compressor 6 becomes a heavy load, the heat exchange using the water-cooled heat exchanger 20 is considered to be more efficient than the heat exchange in the air-cooled heat exchanger 5, and the process proceeds to step G28 to select the water-cooling mode. When the frequency information S is lower than the second set frequency S2, the load of the air-cooled heat exchanger 5 is assumed to be low, and the process returns to Step G29, and heat exchange by the air-cooled heat exchanger 5 is continued.

  That is, at the time of the cooling operation in the fourth combined mode, it is more efficient to perform heat exchange by water cooling when the drainage temperature information WT from the drainage temperature detection sensor 35 is higher than the preset first set temperature WT1. Thus, the flow path through which the heat exchange medium flows is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Further, during the heating operation, the heat exchange medium is assumed that heat exchange by water cooling is more efficient even when the drainage temperature information WT from the drainage temperature detection sensor 35 is lower than the preset second set temperature WT2. Is switched from the first flow path 4B having the air-cooled heat exchanger 5 to the second flow path 4A having the water-cooled heat exchanger 20. Furthermore, even in the air cooling mode in which heat exchange is performed by the air cooling heat exchanger 5, when the output of the compressor 6 becomes high, the water cooling heat exchanger 20 having good heat exchange efficiency is used. Also in the case of this embodiment, when the load on the compressor 6 increases during cooling or heating, the heat using the water-cooled heat exchanger 20 instead of the air-cooled heat exchanger 5 is saved for energy saving. The flow path is switched so that it can be exchanged.

  For this reason, the heat exchange medium circulating in the flow path 4 is guided to the air-cooled heat exchanger 5 when the heat-exchange efficiency of the water-cooled heat exchanger 20 is reduced, and the heat-exchange efficiency of the air-cooled heat exchanger 5 is reduced. Since the water-cooled heat exchanger 20 guides the heat exchange, the air conditioner 1 having the air-cooled and water-cooled heat exchangers can be operated efficiently. In addition, the abnormality determination of the water-cooled heat exchanger 20 and the cooling water supply system is determined from fluctuations in the flow rate information WR and the water pressure information WP1 and WP2, respectively, and if there is an abnormality, the first flow from the second flow path 4A. Since the flow path switching to the path 4A is performed, even when the water-cooled heat exchanger 20 fails, it can function as an air conditioner.

  In each form mentioned above, although the control means 40 was demonstrated as an individual form, the form with which the air conditioner 1 was equipped may be sufficient, and in this case, the hybrid air conditioner 10 which has the control apparatus 40 provided with the above-mentioned function, can do. As the outdoor unit 1, the second flow path 4 </ b> A, the water-cooled heat exchanger 20, the electromagnetic valves 22 to 25, the cooling water flow path 30 that circulates the cooling water to the water-cooled heat exchanger 20, the third flow path 26, and the open / close valve 28 may be a hybrid type provided from the beginning, or may be a hybrid type in which these components are retrofitted to the air-cooled outdoor unit 1.

  The electromagnetic valve 31 is provided in the water supply flow path 34 to control the flow of the cooling water to the water-cooled heat exchanger 20 by opening and closing the flow path. Can be fulfilled. Examples of the cooling water that serves as a water heat source include groundwater, tap water, water used in a cooling tower, stored water, industrial water, antifreeze, and the like. In this embodiment, the flow of the cooling water to the water-cooled heat exchanger 20 is controlled by opening and closing the electromagnetic valve 31, but the supply means for supplying the cooling water without providing the electromagnetic valve 31 is controlled by the control means 40. On / off control may be performed to control the flow of the cooling water to the water-cooled heat exchanger 20.

It is a schematic block diagram of the hybrid air conditioner which is one form of this invention. It is a block diagram which shows the control means of a hybrid air conditioner, and the component connected to this. It is a top view which shows one form of an operation part. It is a flowchart which shows one form of the basic operation process by a control means. It is a flowchart which shows one form of the cooling operation process in a 1st mode. It is a flowchart which shows one form of the heating operation process in a 1st mode. It is a flowchart which shows one form of the cooling operation process in a 2nd mode. It is a flowchart which shows one form of the heating operation process in a 2nd mode. It is a flowchart which shows one form of the cooling operation process in a 3rd mode. It is a flowchart which shows one form of the heating operation process in a 3rd mode. It is a flowchart which shows one form of the cooling operation process in a 1st composite mode. It is a flowchart which shows one form of the heating operation process in a 1st composite mode. It is a flowchart which shows one form of the cooling operation process in a 2nd composite mode. It is a flowchart which shows one form of the heating operation process in a 2nd composite mode. It is a flowchart which shows one form of the cooling operation process in a 3rd compound mode. It is a flowchart which shows one form of the heating operation process in a 3rd composite mode. It is a flowchart which shows one form of the cooling operation process in a 4th compound mode. It is a flowchart which shows one form of the heating operation process in a 4th composite mode. It is a conceptual diagram of the performance comparison between air cooling and water cooling according to the Mollier diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid air conditioner 4 4A in a flow path 2nd flow path 4B 1st flow path 5 Air-cooling type heat exchanger 11 Air-conditioning equipment 20 Water-cooling type heat exchangers 22-25 Switching means 30 Cooling water flow path 35 Cooling water temperature detection means 38 Outside air Temperature detecting means 40 Control device 58 Output fluctuation changing means S1 First setting information (first setting frequency)
S2 Second setting information (second setting frequency)
T1 1st outside air set temperature T2 2nd outside air set temperature WT1 1st set temperature WT2 2nd set temperature

Claims (3)

A first flow path provided with an air-cooled heat exchanger for exchanging heat using a gas with respect to a heat exchange medium circulating in a flow path connected to an air conditioner, and a heat exchange medium circulating in the flow path And a switching means for switching a flow path through which the heat exchange medium flows to the first flow path or the second flow path. A control device for an air-water cooled hybrid air conditioner capable of performing a cooling cycle and a heating cycle,
Includes an inverter mode to switch a flow path through which the heat exchange medium in accordance with the output variation of the previous SL air conditioner into the first flow path or second flow path,
In the inverter mode, when the output fluctuation information from the output fluctuation detection means for detecting the output fluctuation of the hybrid air conditioner during the cooling cycle is higher than the preset first setting information, the heat exchange medium is When the flow path is switched from the first flow path to the second flow path and the output fluctuation information is higher than the preset second setting information during the heating cycle, the flow through which the heat exchange medium flows A control device for an air-water cooled hybrid air conditioner , wherein the switching means is controlled to switch the path from the first flow path to the second flow path . A cooling water mode for switching the flow path through which the heat exchange medium flows to the first flow path or the second flow path in accordance with temperature fluctuations of the cooling water;
In the cooling water mode, the flow path through which the heat exchange medium flows when temperature information from a temperature detection means for detecting the temperature of the cooling water during a cooling cycle is higher than a preset first set temperature. Is switched from the second flow path to the first flow path, and when the temperature information from the temperature detecting means is lower than a preset second set temperature during the heating cycle, the flow through which the heat exchange medium flows 2. The control apparatus for an air-water cooled hybrid air conditioner according to claim 1 , wherein the switching means is controlled to switch the path from the second flow path to the first flow path. Comprising an outside air temperature mode for switching the flow path through which the heat exchange medium flows to the first flow path or the second flow path in accordance with temperature fluctuations around the hybrid air conditioner;
In the outside air temperature mode, when the temperature information from the outside air temperature detecting means for detecting the ambient temperature of the hybrid air conditioner is higher than a preset first outside air set temperature during the cooling cycle, the heat exchange is performed. When the flow path through which the medium flows is switched from the first flow path to the second flow path and the temperature information from the outside air temperature detecting means is lower than the preset second outside air set temperature during the heating cycle, The control device for an air / water cooled hybrid air conditioner according to claim 1 or 2 , wherein the switching means is controlled to switch the flow path through which the heat exchange medium flows from the first flow path to the second flow path. .

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