JP4828299B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air-conditioning system that performs air-conditioning with a hydrothermal medium collected from a refrigerant in a refrigeration cycle via a heat exchanger.

  A hot water heating heat exchanger heated by a heater such as an electric heater type, oil or gas combustion type, and a high temperature load and a low temperature load are connected via a hot water pipe, and the high temperature water generated by the heat exchanger is Supply the high temperature load through the hot water pipe for supplying high temperature water and mix the return water from the load and the high temperature water through the first bypass pipe into the low temperature water supply hot water pipe. There is a two-temperature type hot water heating system that supplies a low-temperature load via a low temperature load (see, for example, Patent Document 1).

JP 2002-22193 A

  However, the above-described conventional technique cannot be applied to an air conditioning system that performs air conditioning with a hydrothermal medium that is collected from a refrigerant in a refrigeration cycle via a heat exchanger. Therefore, there has been a problem that it is impossible to obtain a multiple temperature type air conditioning system using a refrigeration cycle.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the multi-temperature type air-conditioning system which air-conditions with the hydrothermal medium heat-collected from the refrigerant | coolant of the refrigerating cycle through the heat exchanger.

In order to solve the above-described problems and achieve the object, the present invention provides a plurality of independent refrigeration cycles for circulating a refrigerant in each refrigerant circuit of a plurality of heat exchangers, and the plurality of heat exchangers. wherein the plurality of each of the water heat medium circuit of the heat exchanger, the circulating pump connected by a pipe to each of the water heat medium circuit for each of the refrigerant circuit and the heat exchanger, and, Shiruso before being connected to the middle of the pipe water heating medium circuits respectively provided with a switching valve that you switch the parallel connection and the series connection to the circulation pump, wherein to refrigerant heat exchange by circulating water heat medium to the hydrothermal medium circuit A heat exchange unit and a plurality of radiators connected to the heat exchange unit by piping and circulating the hydrothermal medium between the heat exchange unit and the heat exchange unit.

  According to this invention, there exists an effect that the multi-temperature type air conditioning system which air-conditions with the hydrothermal medium sampled from the refrigerant | coolant of the refrigerating cycle via the heat exchanger is obtained.

  Embodiments of an air conditioning system according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a system configuration diagram showing an embodiment of an air conditioning system according to the present invention.

  As shown in FIG. 1, a heat pump type cold / hot water heat source unit 1 includes a heat exchange unit 2 and an outdoor unit 3. Cold / hot water heat source unit 1, front-stage heat exchanger-side radiator 15 as a first radiator having a relatively low cooling / heating capacity connected to piping by cold / hot water heat source unit 1, and a second radiator having a relatively high cooling / heating capacity And the latter-stage heat exchanger-side heat radiator 16 constitute a two-temperature type air conditioning system 100.

  The heat exchange unit 2 performs heat exchange between the buffer tank 4 that stores the hydrothermal medium, the circulation pump 5 that circulates the hydrothermal medium in the cooling / heating system 100, and the refrigerant of the hydrothermal medium and the outdoor unit 3. The front-stage heat exchanger 61 and the rear-stage heat exchanger 62 are connected to each other by piping and are accommodated in a housing. The pipe is connected to the casing, and forward piping connection ports 7 and 7 for discharging the water heat medium to the front heat exchanger side radiator 15 and the rear heat exchanger side radiator 16 and the water heat medium to the front heat A return pipe connection port 9 is provided to return from the exchanger-side radiator 15 and the rear-stage heat exchanger-side radiator 16.

  The buffer tank 4 is provided with a forward connection port and a return connection port. The forward connection port is connected to the suction side of the circulation pump 5, and the return connection port is a return piping connection port. 9 is connected to the pipe. The discharge side of the circulation pump 5 is branched and separated into two independent circuits. The front heat exchanger 61 in which the water heat medium circuit 61b is formed and the rear heat exchanger 62 in which the water heat medium circuit 62b is formed. Pipes are connected to the respective inlet sides, and the outlet sides of the front-stage heat exchanger 61 and the rear-stage heat exchanger 62 are connected in parallel to the outgoing pipe connection ports 7 and 7 via the outlet pipes 21 and 22, respectively.

  A three-way valve 8 as a switching valve is provided on the inlet side of the rear stage heat exchanger 62, and the water heat medium circuits 61 b and 62 b of the front stage heat exchanger 61 and the rear stage heat exchanger 62 are switched by switching the three-way valve 8. Are connected to the circulation pump 5 in parallel connection (water refrigerant flows in the direction of arrow A in FIG. 1) and serial connection (hydrothermal medium flows in the direction of arrow B in FIG. 1). Yes.

  When the hot water is circulated by heating the water heating medium, if the three-way valve 8 is switched so that the water heating medium circuits 61b and 62b of the front heat exchanger 61 and the rear heat exchanger 62 are connected in series, the front heat The exchanger 61 is a low-temperature heat exchanger, and the latter-stage heat exchanger 62 is a high-temperature heat exchanger. The opposite is true when cooling the water medium and circulating cold water.

  Temperature detectors 10 and 10 are provided in the outlet pipes 21 and 22 on the outlet side of the water heat medium of the front heat exchanger 61 and the rear heat exchanger 62, respectively. The outlet pipes 21 and 22 are connected to and communicated with each other via a connecting pipe 11 on the upstream side of the temperature detectors 10 and 10. The connecting pipe 11 is provided with a flow rate adjusting valve 12 to adjust the mixing amount of the hydrothermal medium. To do.

  Although not shown, the outdoor unit 3 is provided with an outdoor heat exchanger, a compressor, a refrigerant flow rate control valve, and the like, which are respectively included in the front heat exchanger 61 and the rear heat exchanger 62 of the heat exchange unit 2. It connects with refrigerant circuit 61a, 62a with a refrigerant pipe. The outdoor unit 3 includes a two-stage or two-line independent first-stage heat exchanger-side refrigeration cycle 31 as a first refrigeration cycle and a second-stage heat exchanger-side refrigeration cycle 32 as a second refrigeration cycle. Further, the rear-stage heat exchanger-side refrigeration cycle 32 has a higher cooling / heating capacity than the front-stage heat exchanger-side refrigeration cycle 31, and can output a higher-temperature or lower-temperature refrigerant circulation output. The refrigerant of the refrigeration cycles 31 and 32 and the hydrothermal medium of the heat exchange unit 2 are not mixed, but are thermally connected by the pre-stage heat exchanger 61 and the post-stage heat exchanger 62.

  The inlet side of the front-stage heat exchanger side radiator 15 and the rear-stage heat exchanger side radiator 16 is divided into two systems and is connected to the outgoing pipe connection ports 7 and 7 via the branch pipes 14 and 14 and the main pipes 13 and 13, respectively. Connected in parallel. Outlet sides of the front-stage heat exchanger side radiator 15 and the rear-stage heat exchanger side radiator 16 merge at the header 23 via branch pipes 14 and 14, respectively, and are connected to the return pipe connection port 9.

  Specific examples of the first and second radiators 15 and 16 include a floor heating panel, a panel heater, a fan coil unit that heats or cools the room air while circulating the room air and performs a cooling / heating function, a bathroom ventilation dryer, and the like. is there. When heating with a convective radiator that performs air conditioning while circulating room air, high-temperature water is required to prevent the feeling of cold air. The rear-stage heat exchanger-side radiator 16 having high cooling / heating capacity connected to the rear-stage heat exchanger 62 to be replaced is used.

  The above radiator is marked at the time of construction so that it can be distinguished whether the pipe is connected to the lower heat exchanger side piping system with a low air conditioning capacity or the latter heat exchanger side piping system with a high air conditioning capacity. Is attached. Further, the radiators 15 and 16 are provided with on-off valves that close the water heat medium circuit of the radiator when not in operation.

  The cold / hot water heat source unit 1 is equipped with a control device 17 including a microcomputer for controlling the circulation pump 5 and the compressor of the outdoor unit 3. The control device 17 is connected to a controller 18 having a display device for displaying an operation state or the like by an operation on / off switch, a setting switch for setting a temperature, an LED, a liquid crystal, or the like through a signal line. The control device 17 takes in the output of the temperature detectors 10 and 10 that detect the temperature of the water heat medium at the outlets of the heat exchangers 61 and 62 as control information.

  The control device 17 takes operation information from the controller 18. When an operation request signal is input from the controller 18 to the control device 17, the control device 17 causes the temperature of the hydrothermal medium sent to the radiators 15 and 16 detected by the temperature detectors 10 and 10 to be a predetermined temperature. The outdoor unit 3, the flow rate adjusting valve 12, the three-way valve 8, and the like are controlled based on information such as the set temperature and the room temperature obtained from the controller 18. When there is no operation request from the controller 18, the air conditioning system 100 is put into a stopped state.

  When only the front heat exchanger side radiator 15 as the first radiator having a low cooling / heating capacity is requested to operate, the flow rate adjusting valve 12 is closed immediately after the start of the operation, and the outdoor unit 3 has the first refrigeration having a low cooling / heating capacity. Only the front-stage heat exchanger-side refrigeration cycle 31 as a cycle is operated. At the start of operation or when the difference between the set temperature and the room temperature is large, the heat radiation load of the front heat exchanger side radiator 15 is large, and a predetermined water heating medium temperature can be obtained only by the front heat exchanger side refrigeration cycle 31. If not, the flow rate adjustment valve 12 is opened and the three-way valve 8 is connected in parallel with the heat exchangers 61 and 62. In addition to the front-stage heat exchanger-side refrigeration cycle 31, the rear-stage heat exchanger-side refrigeration cycle 32 is also provided. Operate (refer to “First stage only” in Table 1).

  The water heating medium heated or cooled by the rear stage heat exchanger 62 passes through the connecting pipe 11, joins the outlet of the front stage heat exchanger 61, and is sent to the front stage heat exchanger side radiator 15. When the room is warmed or cooled and a predetermined hydrothermal medium temperature can be obtained only by the front-stage heat exchanger-side refrigeration cycle 31, the flow regulating valve 12 is closed and the rear-stage heat exchanger-side refrigeration cycle 32 is stopped. Only the heat exchanger-side refrigeration cycle 31 is operated (see “only the previous stage” in Table 1).

  When only the rear heat exchanger side radiator 16 as the second radiator having a relatively high cooling / heating capacity is requested to operate, the flow rate adjustment valve 12 is closed immediately after the operation is started, and the three-way valve 8 is connected to the heat exchanger 61, 62 is connected in parallel, and only the second-stage heat exchanger-side refrigeration cycle 32 is operated as a second refrigeration cycle having a relatively high cooling / heating capacity. At the start of operation or when the difference between the set temperature and the room temperature is large, the heat radiation load of the rear heat exchanger side radiator 16 is large, and a predetermined water heating medium temperature can be obtained only by the rear heat exchanger side refrigeration cycle 32. If not, the flow rate adjustment valve 12 is closed, and the three-way valve 8 is switched so that the heat exchangers 61 and 62 are connected in series. In addition to the rear heat exchanger side refrigeration cycle 32, the front heat exchanger side refrigeration cycle 31 is switched. (See “Only the latter part” in Table 1).

  After heating or cooling the hydrothermal medium with the front-stage heat exchanger 61, the hydrothermal medium is further heated or cooled with the rear-stage heat exchanger 62 to obtain a predetermined hydrothermal medium temperature. When the room is warmed or cooled and a predetermined hydrothermal medium temperature is obtained only by the second-stage heat exchanger-side refrigeration cycle 32, the three-way valve 8 is switched so that the heat exchangers 61 and 62 are connected in parallel. The heat exchanger-side refrigeration cycle 31 is stopped and only the rear-stage heat exchanger-side refrigeration cycle 32 is operated. When a predetermined hydrothermal medium temperature is obtained only by the post-stage heat exchanger side refrigeration cycle 32, the heat exchangers 61 and 62 are connected in parallel in order to reduce the flow resistance of the hydrothermal medium circuit (see Table 1). (See “Only the latter part”).

  When there is an operation request for both the front-stage heat exchanger side radiator 15 as the first radiator and the rear-stage heat exchanger side radiator 16 as the second radiator, the flow rate adjustment valve 12 is immediately after the start of operation. The three-way valve 8 is connected in parallel with the heat exchangers 61 and 62, and the front-stage heat exchanger side refrigeration cycle 31 as the first refrigeration cycle and the rear-stage heat exchanger side as the second refrigeration cycle Both the refrigeration cycles 32 are operated to generate a hydrothermal medium having a predetermined different temperature (see “Simultaneous pre-stage and post-stage” in Table 1).

  If the heat dissipating load of the radiator is large, such as at the start of operation or when there is a large difference between the set temperature and the room temperature, and the hydrothermal medium cannot be chilled / heated at the specified temperature with only one refrigeration cycle, Switch the hydrothermal doubler circuit as

  When the front heat exchanger side refrigeration cycle 31 cannot make the water heating medium into cold / hot water having a predetermined temperature, the flow rate adjusting valve 12 is opened, and the hot / cold water heated or cooled in the rear heat exchanger side refrigeration cycle 32 is supplied. The hydrothermal medium mixed with the chilled / heated water heated or cooled in the pre-stage heat exchanger-side refrigeration cycle 31 and discharged to the pre-stage heat exchanger-side radiator 15 is chilled / hot water having a predetermined temperature. The flow rate adjusting valve 12 adjusts the opening degree so that the temperature of the hydrothermal medium detected by the temperature detector 10 becomes a predetermined temperature (refer to “Simultaneous stage and rear stage” in Table 1).

  When the post-stage heat exchanger-side refrigeration cycle 32 cannot make the hot-water medium into cold / hot water having a predetermined temperature, the flow rate adjustment valve 12 is closed and the three-way valve 8 is connected in series with the heat exchangers 61 and 62. The hydrothermal medium heated and cooled in the first-stage heat exchanger-side refrigeration cycle 31 is further heated or cooled in the second-stage heat exchanger-side refrigeration cycle 32 and discharged to the second-stage heat exchanger-side radiator 16. Is defined as cold / hot water having a predetermined temperature (see “Simultaneous stage and back stage” in Table 1).

  At this time, the hydrothermal medium after heat exchange by the pre-stage heat exchanger 61 is sent to the pre-stage heat exchanger side radiator 15. When the water heating medium can be brought to a predetermined temperature by only one refrigeration cycle, the flow rate adjusting valve 12 is closed, and the three-way valve 8 is switched so that the heat exchangers 61 and 62 are connected in parallel. Both the heat exchanger-side refrigeration cycle 31 and the post-stage heat exchanger-side refrigeration cycle 32 are operated, and the hydrothermal medium is heated or cooled to a predetermined different temperature and discharged to the radiators 15 and 16 (see “Table 1” (Refer to “Simultaneous front and rear stages”).

  The operations of the front-stage heat exchanger-side refrigeration cycle 31 and the rear-stage heat exchanger-side refrigeration cycle 32 may be operated differently between the cooling operation and the heating operation. In this case, one of the refrigeration cycles as described above is used. However, when the ability is insufficient, the ability cannot be supplemented.

  As described above, since the cooling / heating system 100 according to the present embodiment includes the two independent refrigeration cycles 31 and 32, the convection-type radiator that requires high-temperature water and low-temperature water such as floor heating are used. For example, when a radiator that requires a heat sink is provided, a hydrothermal medium having a temperature suitable for each radiator can be supplied.

  Further, the radiator may be only a convection type radiator that requires high-temperature water, or only a radiator that requires low-temperature water such as floor heating. For example, when the operation start time zone of the radiator is different, the rising of one of the radiators requires high-temperature water, and the other radiator can be appropriately handled in a steady state using low-temperature water.

  If three independent refrigeration cycles are provided, cold / hot water having three different temperatures can be supplied. In the case of heating, the heat pump is more efficient as the temperature of the hydrothermal medium to be heated is lower, but according to this embodiment, the low-temperature water radiator is used at a hot water temperature that matches the high-temperature water radiator as in the prior art. Since low-temperature hydration can be achieved rather than driving, the efficiency of the heat pump is good, and as a result, running cost can be reduced.

  Moreover, since the thermal environment of the space where the low-temperature water radiator is installed is changed from the conventional high-temperature water intermittent operation to the low-temperature water continuous operation, the comfort is improved. Moreover, cold water and hot water can be generated simultaneously, and simultaneous operation of cooling and heating is possible, improving usability of the cooling and heating system.

  Further, by switching the two heat exchangers 61 and 62 between the parallel connection and the series connection by the three-way valve 8 and joining the outlet sides of the two heat exchangers 61 and 62 by the flow rate adjusting valve 12, When only the refrigeration cycle cannot supply cold / hot water having a predetermined temperature, the capacity can be easily supplemented. Therefore, it is not necessary to increase the size and capacity of the heat source unit, and the cost can be reduced.

  As described above, the air conditioning system according to the present invention can supply a hydrothermal medium having a temperature suitable for each radiator, can reduce running costs, has high comfort, and is operated simultaneously with air conditioning. However, it is useful as a low-cost air conditioning system without the need to increase the size and capacity of the heat source unit.

It is a system configuration figure showing an embodiment of an air-conditioning system of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cold / hot water heat source machine 2 Heat exchange unit 3 Outdoor unit 31 Previous stage heat exchanger side refrigeration cycle (1st refrigeration cycle)
32 Second-stage heat exchanger side refrigeration cycle (second refrigeration cycle)
4 Buffer tank 5 Circulation pump 61 Pre-stage heat exchanger 62 Post-stage heat exchanger 61a, 62a Refrigerant circuit 61b, 62b Hydrothermal medium circuit 7 Outward piping connection port 8 3-way valve 9 Return piping connection port 10 Temperature detector 11 Connection tube 12 Flow control valve 13 Main pipe 14 Branch pipe 15 Pre-stage heat exchanger side radiator (first radiator)
16 Rear-stage heat exchanger side radiator (second radiator)
17 Control device 18 Controller 21, 22 Outlet piping 23 Header 100 Air conditioning system

Claims (8)

A plurality of independent refrigeration cycles for circulating a refrigerant in each refrigerant circuit of the plurality of heat exchangers;
Each of the plurality of heat exchangers for exchanging heat with each refrigerant circuit of the plurality of heat exchangers, a circulation pump connected to each of the water heat medium circuits by piping, and water heating medium circuit Shiruso respectively before being connected to the middle, provided with a switching valve that you switch the parallel connection and the series connection to the circulation pump to circulate the water heat medium to the hydrothermal medium circuit A heat exchange unit for exchanging heat with the refrigerant;
A plurality of radiators piped to the heat exchange unit to circulate the water heat medium with the heat exchange unit;
An air conditioning system comprising: 2. The air conditioning system according to claim 1 , further comprising a flow rate adjusting valve that communicates the outlet side of each of the plurality of heat exchangers with the water heat medium circuit and mixes the water heat medium. The air conditioning system according to claim 2 , wherein each of the plurality of independent refrigeration cycles can be operated independently and simultaneously. The air conditioning system according to claim 3 , wherein the plurality of independent refrigeration cycles have different air conditioning capabilities. When only the first radiator and the first refrigeration cycle with low air-conditioning capacity are operating and the heat radiation load of the first radiator is large, the flow control valve is opened, The respective water heat medium circuits of the heat exchanger are connected in parallel, the plurality of refrigeration cycles are operated simultaneously, the water heat medium discharged from the plurality of heat exchangers is mixed and circulated to the first radiator. The cooling / heating system according to claim 4 , wherein When only the second radiator and the second refrigeration cycle having higher air conditioning capacity than the first radiator and the first refrigeration cycle are operated, and the heat radiation load of the second radiator is When it is large, each of the plurality of heat exchangers is connected in series to each other, and the plurality of refrigeration cycles are operated simultaneously, and the water heat medium discharged from the heat exchanger at the subsequent stage of the series connection is The air conditioning system according to claim 4 , wherein the air conditioning system is circulated through the second radiator. When both the first radiator and the first refrigeration cycle and the second radiator and the second refrigeration cycle are operated, and the heat radiation load of the first radiator is large. Open the flow regulating valve, connect the water heat medium circuits of the plurality of heat exchangers in parallel, and supply the water heat medium discharged from the heat exchanger on the second refrigeration cycle side to the first heat exchanger. The air-conditioning system according to claim 4 , wherein the air-conditioning system is mixed with a water heat medium discharged from a heat exchanger on a refrigeration cycle side and circulated through the first radiator. When both the first radiator and the first refrigeration cycle and the second radiator and the second refrigeration cycle are operated, and the heat radiation load of the second radiator is large. Closes the flow rate regulating valve, connects the respective water heat medium circuits of the plurality of heat exchangers in series, and supplies the second heat radiator as the water heat medium discharged from the heat exchanger at the subsequent stage of the series connection. The cooling / heating system according to claim 4 , wherein the cooling / heating system is recirculated.

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