JP7415092B2 - air conditioning system - Google Patents

Description

The present disclosure relates to air conditioning systems.

Japanese Unexamined Patent Publication No. 2004-125288 (Patent Document 1) discloses an air conditioning system that air-conditions a controlled area. An air blower, a cooling coil, and a heating coil are arranged inside the air conditioner. The controller is connected to a pyranometer and a thermometer provided on the outer wall of the building. The controller determines the supply air temperature set value in consideration of the amount of solar radiation measured by the pyranometer and the outside air temperature measured by the thermometer.

Japanese Patent Application Publication No. 2004-125288

An air conditioner having a cooling heat exchanger (cooling coil) and a heating heat exchanger (heating coil) as in Patent Document 1 can freely switch between cooling operation and heating operation. Therefore, depending on the amount of heat that enters the room depending on the outside temperature and amount of solar radiation, and the amount of heat generated from the human body and appliances inside the room, cooling and heating operations are performed depending on the indoor temperature, which changes from moment to moment. By switching and executing, the indoor temperature can be maintained at the set temperature.

However, on the other hand, immediately after switching from cooling operation to heating operation, heating operation is executed to cancel the cooling effect of the previous cooling operation, and the energy consumption of the air conditioner during heating operation is reduced. There is concern that this will lead to a needless increase in Immediately after heating operation is switched to cooling operation, cooling operation is executed to cancel the heating effect of the previous heating operation, which wastefully increases the energy consumption of the air conditioner during cooling operation. There are concerns.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to reduce the energy consumption of an air conditioner having a cooling heat exchanger and a heating heat exchanger. Our goal is to provide an air conditioning system that can.

An air conditioning system according to an aspect of the present disclosure includes an air conditioner that conditions the air inside a building, a temperature sensor installed indoors that detects the indoor temperature, and an air conditioner that cools the air conditioner according to the indoor temperature. It is equipped with a controller that switches between operation and heating operation. The air conditioner includes a first heat exchanger, a second heat exchanger, a first valve, a second valve, and a fan. The first heat exchanger cools the air by exchanging heat between the first heat medium and the air. The second heat exchanger heats the air by exchanging heat between the second heat medium and the air. The first valve is provided in the first heat medium circulation path and is opened during cooling operation. The second valve is provided in the second heat medium circulation path and is opened during heating operation. A fan forces air through the first heat exchanger and the second heat exchanger. The controller includes a cooling control section and a heating control section. The cooling control unit supplies the first heat medium to the first heat exchanger by controlling the opening degree of the first valve according to the first deviation between the cooling set temperature and the indoor temperature during the cooling operation. Adjust the supply amount. The heating control unit controls the opening degree of the second valve according to the second deviation between the heating set temperature and the indoor temperature during the heating operation, thereby controlling the second heat medium to the second heat exchanger. Adjust the supply amount. When performing cooling operation in a heating-main period in which indoor air is conditioned mainly through heating operation, the cooling control unit controls the supply amount of the first heat medium to the first heat exchanger by a first deviation. The supply amount of the first heat medium is decreased depending on the amount of the first heat medium. When performing heating operation in a cooling-main period in which indoor air is mainly conditioned by cooling operation, the heating control unit controls the supply amount of the second heat medium to the second heat exchanger according to a second deviation. The supply amount of the second heat medium is decreased according to the amount of the second heat medium.

According to the present disclosure, it is possible to provide an air conditioning system that can reduce the energy consumption of an air conditioner that includes a cooling heat exchanger and a heating heat exchanger.

1 is a diagram showing a schematic configuration of an air conditioning system according to an embodiment. FIG. 2 is a block diagram showing an example of a functional configuration of a controller. FIG. 3 is a block diagram showing a configuration example of the cooling control section shown in FIG. 2. FIG. FIG. 4 is a block diagram showing a configuration example of a correction section shown in FIG. 3. FIG. FIG. 3 is a diagram schematically showing an example of the relationship between outside air temperature and suppression rate. FIG. 3 is a diagram schematically showing an example of the relationship between the amount of solar radiation and the suppression rate. It is a figure which shows an example of the opening degree control of the cold water two-way valve in an air conditioning control part. FIG. 3 is a block diagram showing a configuration example of a heating control section shown in FIG. 2. FIG. 9 is a block diagram showing a configuration example of a correction section shown in FIG. 8. FIG. FIG. 3 is a diagram schematically showing an example of the relationship between outside air temperature and suppression rate. FIG. 3 is a diagram schematically showing an example of the relationship between the amount of solar radiation and the suppression rate. It is a figure showing an example of opening degree control of a hot water two-way valve in a heating control part. It is a flow chart explaining the processing procedure of opening degree control of a two-way cold water valve and a two-way hot water valve concerning this embodiment. It is a figure explaining the 1st example of operation of the air conditioning system concerning this embodiment. It is a figure explaining the 2nd example of operation of the air conditioning system concerning this embodiment.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the same or corresponding parts in the figures are denoted by the same reference numerals, and the description thereof will not be repeated.

<Configuration of air conditioning system>
First, with reference to FIG. 1, the configuration of an air conditioning system according to an embodiment will be described. The air conditioning system 100 according to the embodiment is applied to an air conditioning system for conditioning the air in a room 52 in a building 50.

FIG. 1 is a diagram showing a schematic configuration of an air conditioning system 100 according to an embodiment. As shown in FIG. 1, the air conditioning system 100 includes an air conditioner 10, ducts 14, 15, 16, a controller 20, a temperature/humidity sensor 22, an outside temperature sensor 24, and a solar radiation sensor 26. .

The air conditioner 10 conditions the air in a room 52 of a building 50. The air conditioner 10 can be installed, for example, in the ceiling or under the floor of the building 50. The attic is a space formed by providing a ceiling, and the underfloor is a space formed by providing a floor.

The air conditioner 10 sucks air through an inlet 11 and blows out air through an outlet 12. The air outlet 12 is connected to an air outlet 560 provided in the ceiling 56 of the room 52 through the air supply duct 14 . The suction port 11 is connected by a return air duct 16 to a suction port 580 provided near the floor surface 58 of the room 52 . The suction port 11 is further connected to an outside air duct 15 for taking outside air into the room 52.

In the example of FIG. 1, air near the floor 58 of the room 52 is sucked into the air conditioner 10 from the suction port 11 via the suction port 580 and the return air duct 16. Air blown out from the air conditioner 10 is blown out into the room 52 from the air outlet 560 via the air outlet 12 and the air supply duct 14.

The air conditioner 10 includes a filter 30, a cold water coil 32, a cold water circulation path 33, a cold water two-way valve 34, a hot water coil 36, a hot water circulation path 37, a hot water two-way valve 38, and a humidifier. 40, a humidification supply path 41, a humidification two-way valve 42, and a fan 44.

A ventilation path from the suction port 11 to the blowout port 12 is formed inside the air conditioner 10 . The filter 30, the cold water coil 32, the hot water coil 36, the humidifier 40, and the fan 44 are arranged on this ventilation path in this order from the upstream side in the air flow direction. Note that the arrangement order of the cold water coil 32, hot water coil 36, and humidifier 40 is not limited as long as the filter 30 is arranged at the most upstream side of the ventilation path and the fan 44 is arranged at the most downstream side of the ventilation path.

Air sucked in from the suction port 11 of the air conditioner 10 passes through the filter 30. Dust in the air is removed by the filter 30. The air that has passed through the filter 30 passes through the cold water coil 32, hot water coil 36, and humidifier 40 in this order.

The cold water coil 32 receives a supply of a cooling heat medium (for example, cold water) from an external heat source device (not shown) via a cold water circulation path 33. The cold water coil 32 is configured to cool the ventilated air by exchanging heat between the ventilated air and a heat medium.

The cold water two-way valve 34 is provided in the cold water circulation path 33. The opening degree of the cold water two-way valve 34 is controlled by the controller 20. By controlling the opening degree of the two-way cold water valve 34, the amount of heat medium supplied to the cold water coil 32 can be adjusted. Note that it is also possible to completely close the cold water two-way valve 34 (opening degree = 0%) to stop the supply of the heat medium to the cold water coil 32. The chilled water coil 32 corresponds to an embodiment of a "first heat exchanger", and the chilled water two-way valve 34 corresponds to an embodiment of a "first valve".

The hot water coil 36 receives a supply of a heating medium (for example, hot water) from an external heat source device (not shown) via a hot water circulation path 37. The hot water coil 36 is configured to heat the ventilated air by exchanging heat between the ventilated air and a heat medium.

The hot water two-way valve 38 is provided in the hot water circulation path 37. The opening degree of the hot water two-way valve 38 is controlled by the controller 20. By controlling the opening degree of the hot water two-way valve 38, the amount of heat medium supplied to the hot water coil 36 can be adjusted. Note that it is also possible to completely close the hot water two-way valve 38 (opening degree = 0%) to stop the supply of the heat medium to the hot water coil 36. The hot water coil 36 corresponds to an example of a "second heat exchanger," and the hot water two-way valve 38 corresponds to an example of a "second valve."

The humidifier 40 is configured to humidify ventilated air using a humidifying medium supplied via the humidifying supply path 41. The humidifying two-way valve 42 is provided in the humidifying supply path 41. By controlling the opening degree of the two-way humidifying valve 42, the amount of humidifying medium supplied to the humidifier 40 can be adjusted. Note that it is also possible to completely close the humidifying two-way valve 42 (opening degree = 0%) and stop supplying the humidifying medium to the humidifier 40.

The fan 44 sends the air that has passed through the ventilation path from the outlet 12 to the air supply duct 14. The operation of fan 44 is controlled by controller 20.

The temperature and humidity sensor 22 is installed in the room 52. The outside temperature sensor 24 and the solar radiation sensor 26 are installed outside the building 50 (for example, on the outer wall or rooftop of the building 50). The temperature/humidity sensor 22 , the outside temperature sensor 24 , and the solar radiation sensor 26 are communicatively connected to the controller 20 .

The temperature/humidity sensor 22 detects the indoor temperature Tr and the indoor humidity Hr, and outputs a signal indicating the detected values to the controller 20. The temperature and humidity sensor 22 is arranged, for example, in a perimeter zone on the window 54 side (or on the outer wall side) of the room 52. The number of temperature and humidity sensors 22 is not limited. For example, a configuration in which a plurality of temperature/humidity sensors 22 are distributed and arranged in a perimeter zone of the room 52 and an interior zone on the center side of the building 50, and the average value of the detection values of the plurality of temperature/humidity sensors 22 is obtained as the indoor temperature Tr. You can also use it as The temperature/humidity sensor 22 corresponds to an example of a "temperature sensor".

The outside air temperature sensor 24 detects the outside air temperature To of the building 50 and outputs a signal indicating the detected value to the controller 20. The solar radiation amount sensor 26 detects the solar radiation amount Si indicating the intensity of solar radiation irradiated onto the building 50, and outputs a signal indicating the detected value to the controller 20. The outside temperature sensor 24 corresponds to an example of an "outside temperature sensor", and the solar radiation amount sensor 26 corresponds to an example of a "solar radiation amount sensor".

The number of outside temperature sensors 24 and solar radiation sensors 26 is not limited. For example, a configuration may be adopted in which a plurality of outside temperature sensors 24 are arranged in a distributed manner and the average value of the detection values of the plurality of outside temperature sensors 24 is acquired as the outside air temperature To. Similarly, a configuration may be adopted in which a plurality of solar radiation sensors 26 are arranged in a distributed manner and the average value of the detection values of the plurality of solar radiation sensors 26 is acquired as the solar radiation amount Si.

The controller 20 controls the operation of the air conditioner 10 based on output signals (detected values) from the temperature/humidity sensor 22, the outside temperature sensor 24, and the solar radiation sensor 26. The air conditioner 10 has a cooling operation and a heating operation as operation modes. The controller 20 switches between cooling operation and heating operation according to the indoor temperature Tr detected by the temperature/humidity sensor 22.

Specifically, when the indoor temperature Tr detected by the temperature/humidity sensor 22 is higher than the preset cooling temperature Tsc (Tr>Tsc), the controller 20 selects the cooling operation. In the cooling operation, the controller 20 adjusts the amount of heat medium supplied to the chilled water coil 32 by controlling the opening degree of the two-way chilled water valve 34 so that the indoor temperature Tr matches the cooling set temperature Tsc, and also controls the amount of heat medium supplied to the chilled water coil 32 so that the indoor temperature Tr matches the cooling set temperature Tsc. Control behavior. The opening degree control of the two-way cold water valve 34 will be described later.

On the other hand, when the indoor temperature Tr detected by the temperature/humidity sensor 22 is lower than the preset heating temperature Tsh (Tr<Tsh), the controller 20 selects the heating operation. In the heating operation, the controller 20 adjusts the amount of heat medium supplied to the hot water coil 36 by controlling the opening of the hot water two-way valve 38 so that the indoor temperature Tr matches the heating set temperature Tsh, and also controls the amount of heat medium supplied to the hot water coil 36 so that the indoor temperature Tr matches the heating set temperature Tsh. Control behavior. The opening degree control of the hot water two-way valve 38 will be described later.

Note that the cooling set temperature Tsc and the heating set temperature Tsh can be set freely. However, in order to avoid simultaneous execution of cooling operation and heating operation, the setting is made to satisfy the relationship Tsc≧Tsh. Further, in order to prevent hunting between cooling operation and heating operation, it is desirable to provide a temperature difference between cooling set temperature Tsc and heating set temperature Tsh.

During heating operation, the controller 20 controls the opening degree of the humidifying two-way valve 42 so that the indoor humidity Hr detected by the temperature/humidity sensor 22 matches a predetermined set humidity Hs.

The controller 20 includes a CPU (Central Processing Unit), a memory, and an input/output (I/O) circuit as main components. These components can exchange data with each other via an internal bus (not shown). A program is stored in a partial area of the memory, and when the CPU executes the program, various processes including control of the air conditioner 10, which will be described later, can be realized. The I/O circuit inputs and outputs signals and data to and from the outside of the controller 20.

Alternatively, unlike the example in FIG. 1, at least a portion of the controller 20 can be configured using a circuit such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). Further, at least a portion of the controller 20 may be configured by an analog circuit.

<Functional configuration of controller>
Next, the functional configuration of the controller 20 will be described with reference to FIG. 2. FIG. 2 is a block diagram showing an example of the functional configuration of the controller 20. As shown in FIG. The functions of each block shown in FIG. 2 can be realized by at least one of software processing and hardware processing by the controller 20.

As shown in FIG. 2, the controller 20 includes an input section 70, a main control section 72, a cooling control section 74, a heating control section 76, a humidity control section 78, and a fan control section 80.

The input unit 70 receives user commands for the air conditioning system 100. The user commands include an operation on/off command for the air conditioner 10, a set temperature (cooling set temperature Tsc, heating set temperature Tsh) command, and a set humidity command.

The user command further includes setting of a cooling-main period/heating-main period. The "cooling-mainly period" corresponds to a period in which the indoor temperature Tr is mainly controlled by the cooling operation of the air conditioner 10. The "heating-mainly period" corresponds to a period in which the indoor temperature Tr is mainly controlled by the heating operation of the air conditioner 10.

Note that the cooling-based period and the heating-based period can be freely set. For example, the cooling-dominant period is set to correspond to a period in which the cooling load (the amount of heat that must be removed for cooling) exceeds the heating load (the amount of heat that must be heated for heating). The heating-dominant period is set to correspond to a period in which the heating load exceeds the cooling load. As an example, the cooling-main period is set to a period including the summer season (for example, May to October), and the heating-main period is set to a period including the winter season (for example, from November to April).

In this embodiment, it is assumed that the user of air conditioning system 100 manually switches between the cooling-based period and the heating-based period. However, a configuration may be adopted in which the controller 20 automatically switches between the cooling-based period and the heating-based period according to a preset schedule.

Alternatively, the controller 20 may automatically switch between the cooling-based period and the heating-based period based on the temporal change in the outside air temperature To detected by the outside air temperature sensor 24. For example, the controller 20 calculates the average value of the maximum temperature and minimum temperature for each day from the temporal change of the outside air temperature To over the last few days, and switches between the cooling-based period and the heating-based period according to the average value.

The main control unit 72 receives user commands through the input unit 70 and also receives output signals (detected values Tr, Hr) from the temperature and humidity sensor 22. The main control section 72 generates control commands to each section based on these input signals in order to control the overall operation of the air conditioner 10.

The cooling control section 74 receives output signals (detected values Tr, To, Si) from the temperature/humidity sensor 22, the outside temperature sensor 24, and the solar radiation sensor 26, and also receives control commands from the main control section 72. The control command includes the cooling set temperature Tsc and a command to execute a process for suppressing the amount of heat medium supplied to the cold water coil 32, which will be described later. Based on these inputs, the cooling control unit 74 generates an opening degree command Vc*, which is a control amount for the opening degree of the two-way cold water valve 34, and sends the generated opening degree command Vc* to the two-way cold water valve 34. Output.

The heating control section 76 receives output signals (detected values Tr, To, Si) from the temperature/humidity sensor 22, outside temperature sensor 24, and solar radiation sensor 26, and also receives control commands from the main control section 72. The control command includes the heating set temperature Tsh and a command to execute a process for suppressing the amount of heat medium supplied to the hot water coil 36, which will be described later. Based on these inputs, the heating control unit 76 generates an opening command Vh*, which is a control amount for the opening of the hot water two-way valve 38, and sends the generated opening command Vh* to the hot water two-way valve 38. Output.

The humidity control unit 78 receives an output signal (detection value Hr) from the temperature and humidity sensor 22 and a control command from the main control unit 72, and generates an opening command for controlling the opening of the two-way humidifying valve 42. do. The humidity control unit 78 outputs the generated opening degree command to the humidifying two-way valve 42.

Fan control section 80 receives control commands from main control section 72 . The control command includes a rotation speed command for controlling the rotation speed of the fan 44. The fan control unit 80 controls the operation of the fan 44 according to the rotation speed command.

(Configuration of cooling control unit)
Next, the functional configuration of the cooling control section 74 will be described with reference to FIGS. 3 to 7.

FIG. 3 is a block diagram showing a configuration example of the cooling control section 74 shown in FIG. 2. As shown in FIG. As shown in FIG. 3, the cooling control unit 74 controls the opening command Vc* of the two-way cold water valve 34 by feedback control to make the indoor temperature Tr detected by the temperature/humidity sensor 22 follow the cooling set temperature Tsc. configured to generate.

Specifically, the cooling control section 74 includes a subtracter 740, a controller 742, and a correction section 744. The subtractor 740 calculates the deviation ΔTc of the room temperature Tr from the cooling set temperature Tsc (ΔTc=Tsc−Tr). The deviation ΔTc corresponds to a "first deviation".

The controller 742 receives the deviation ΔTc calculated by the subtractor 740 and performs a control calculation to set the deviation ΔTc to 0, thereby generating an opening command Vc* for the two-way cold water valve 34. That is, the opening degree command Vc* of the cold water two-way valve 34 corresponds to the control amount for setting Tr=Tsc. Note that the controller 742 can be a PI (proportional integral) controller, a PID (proportional integral differential) controller, or the like. Controller 742 corresponds to one embodiment of a "first controller."

The correction unit 744 adjusts the opening degree of the cold water two-way valve 34 based on the execution command given from the main control unit 72, the outside air temperature To detected by the outside air temperature sensor 24, and the amount of solar radiation Si detected by the amount of solar radiation sensor 26. Correct the command Vc*. The correction unit 744 corresponds to an example of a “first correction unit”.

Specifically, the main control unit 72 determines whether the current time corresponds to a heating-based period based on current time information given from a clock (not shown). When the current time corresponds to the heating-main period, the main control unit 72 generates an execution command for processing to suppress the amount of heat medium supplied to the cold water coil 32. If the current time does not correspond to the heating-based period, the main control unit 72 does not generate the execution command. That is, when performing cooling operation during the main heating period, the main control unit 72 causes the cooling control unit 74 to execute a process of suppressing the amount of heat medium supplied to the chilled water coil 32.

As mentioned above, during the heating-main period, heating operation is the main operation. On the other hand, the air conditioner 10 is configured to be able to switch between cooling operation and heating operation depending on the indoor temperature Tr. The indoor temperature Tr changes from moment to moment due to the amount of heat entering the room 52 according to the outside air temperature and the amount of sunlight, and the amount of heat generated from the human body and appliances in the room 52. Therefore, during the main heating period, the air conditioner 10 may temporarily perform the cooling operation due to the indoor temperature Tr exceeding the cooling set temperature Tsc.

For example, if the indoor temperature Tr rises to follow the rise in the outside air temperature and the increase in the amount of solar radiation, and the indoor temperature Tr exceeds the cooling set temperature Tsc for several hours after noon, the indoor temperature Tr is set to the cooling setting. Cooling operation is temporarily performed to lower the temperature to Tsc. Thereafter, when the indoor temperature Tr falls below the heating set temperature Tsh to follow the decrease in the outside air temperature and the decrease in the amount of solar radiation, the heating operation is started.

In such a case, as the outside temperature decreases and the amount of solar radiation decreases, the indoor air conditioning 52 tends to be excessively cooled due to the synergistic effect with the cooling operation, resulting in a wasteful increase in the energy consumption of the air conditioner 10 during the cooling operation. Become.

Furthermore, after the transition to heating operation, heating operation is performed so as to cancel out the cooling effect of the immediately preceding cooling operation. This is because the cooling effect from the previous cooling operation acts as a heating load. That is, immediately after the transition to the heating operation, the heating operation is performed so as to replenish the amount of heat removed from the room 52 by the immediately preceding cooling operation. As a result, the energy consumption of the air conditioner 10 during heating operation increases unnecessarily.

In order to address the above-mentioned concerns, in the present embodiment, as described below, the cooling effect is suppressed by reducing the cooling capacity of the air conditioner 10 during the heating-main period.

Specifically, when receiving the execution command from the main control unit 72, the correction unit 744 corrects the opening command Vc* so as to reduce the opening command Vc* generated by the controller 742. . That is, when performing the cooling operation during the main heating period, the correction unit 744 reduces the supply amount of the heat medium supplied to the chilled water coil 32 from the supply amount according to the deviation ΔTc, thereby improving the air conditioner 10. decreases the cooling capacity of the FIG. 4 is a block diagram showing a configuration example of the correction section 744 shown in FIG. 3. As shown in FIG.

As shown in FIG. 4, the correction unit 744 includes suppression rate calculation units 82 and 84, multipliers 85 and 88, and a switching unit 86. The suppression rate calculation units 82 and 84 and the multiplier 85 calculate a correction coefficient for correcting the opening degree command Vc*. This correction coefficient represents the degree to which the amount of heat medium supplied to the chilled water coil 32 is suppressed (that is, corresponds to the degree to which the cooling capacity is suppressed), and therefore is defined as "cooling suppression rate Rcs" in this specification. .

The correction unit 744 corrects the opening command Vc* by multiplying the opening command Vc* given from the controller 742 by the cooling suppression rate Rcs (Vc*=Vc**×Rcs). The cooling suppression rate Rcs can take a value from 0 (%) to 100 (%) depending on the outside air temperature To and the amount of solar radiation Si. Note that when Rcs=100 (%), Vc*=Vc*, and the opening command Vc* is not substantially corrected. Therefore, the amount of heat medium supplied to the cold water coil 32 (cooling capacity) is not suppressed. As the cooling suppression rate Rcs decreases from 100 (%), the degree to which the amount of heat medium supplied to the chilled water coil 32 (cooling capacity) is suppressed increases.

The cooling suppression rate Rcs is calculated using a suppression rate Rc1 for suppressing the cooling capacity against a rise in outside air temperature, and a suppression rate Rc2 for suppressing the cooling capacity against an increase in solar radiation.

Both the outside air temperature and the amount of solar radiation lead to an increase in the indoor temperature, which creates a cooling load, but acts as a positive factor during heating operation. Therefore, in the present embodiment, the correction unit 744 is configured to calculate the cooling suppression rate Rcs according to the outside air temperature and the amount of solar radiation, thereby suppressing the amount of heat removed from the indoor room 52 due to the outside temperature and the amount of solar radiation. This makes it possible to reduce the amount of heat supplied to the room 52 during the heating operation that is performed following the cooling operation.

Specifically, the suppression rate calculation unit 82 calculates the suppression rate Rc1 based on the outside air temperature To detected by the outside air temperature sensor 24. The suppression rate Rc1 corresponds to an example of a "first suppression rate." FIG. 5 is a diagram schematically showing an example of the relationship between the outside air temperature To and the suppression rate Rc1. The horizontal axis in FIG. 5 indicates the outside air temperature To, and the vertical axis indicates the suppression rate Rc1. The suppression rate Rc1 can take a value from 0 (%) to 100 (%).

In the example of FIG. 5, when To≧To2, the suppression rate Rc1 is set to 100%. When To2>To≧To1, the suppression rate Rc1 is set to decrease as the outside temperature To decreases. When To<To1, the suppression rate Rc1 is set to Xc (%) (0<Xc<100).

As the suppression rate Rc1 decreases from 100 (%), the degree to which the amount of heat medium supplied to the cold water coil 32 (cooling capacity) is suppressed increases. As shown in FIG. 5, by decreasing the suppression rate Rc1 as the outside temperature To decreases, that is, by increasing the extent to which the cooling capacity is suppressed, the indoor air temperature Excessive cooling can be suppressed. Thereby, energy consumption during cooling operation can be reduced. Moreover, since the amount of heat supplied to the room 52 can be reduced when transitioning from cooling operation to heating operation, energy consumption during heating operation can be reduced.

Note that Xc (%) corresponds to the lower limit value of the suppression rate Rc1. By setting the lower limit Xc to the suppression rate Rc1, it is possible to suppress the comfort of the room 52 from being impaired due to suppression of the cooling capacity.

The relationship between the outside temperature To and the suppression rate Rc1 (temperatures To1, To2, and lower limit value Xc) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. .

By storing the relationship shown in FIG. 5 in the memory 204 in advance as a map or relational expression, the suppression rate calculation unit 82 calculates the suppression rate Rc1 based on the outside air temperature To detected by the outside air temperature sensor 24. be able to.

Returning to FIG. 4, the suppression rate calculation unit 84 calculates the suppression rate Rc2 based on the solar radiation amount Si detected by the solar radiation sensor 26. The suppression rate Rc2 corresponds to an example of a "second suppression rate." FIG. 6 is a diagram schematically showing an example of the relationship between the amount of solar radiation Si and the suppression rate Rc2. The horizontal axis in FIG. 6 indicates the amount of solar radiation Si, and the vertical axis indicates the suppression rate Rc2. The suppression rate Rc2 can take a value of 0 (%) to 100 (%).

In the example of FIG. 6, when Si≧Si2, the suppression rate Rc2 is set to 100 (%). When Si2>Si≧Si1, the suppression rate Rc2 is set to decrease as the amount of solar radiation Si decreases. When Si<Si2, the suppression rate Rc2 is set to Yc (%) (0<Yc<100). Yc (%) corresponds to the lower limit of the suppression rate Rc2. By providing the lower limit value Yc for the suppression rate Rc2, it is possible to suppress the comfort of the room 52 from being impaired due to suppression of the cooling capacity.

Similar to the suppression rate Rc1 shown in FIG. 5, as the suppression rate Rc2 decreases from 100 (%), the extent to which the amount of heat medium supplied to the chilled water coil 32 (cooling capacity) is suppressed increases. As shown in FIG. 6, by reducing the suppression rate Rc2 as the solar radiation amount Si decreases, that is, by increasing the degree of suppression of the cooling capacity, the indoor 52 is prevented from being excessively cooled, energy consumption during cooling operation can be reduced. Moreover, since the amount of heat supplied to the room 52 can be reduced when transitioning from cooling operation to heating operation, energy consumption during heating operation can be reduced.

The relationship between the amount of solar radiation Si and the suppression rate Rc2 (the amount of solar radiation Si1, Si2 and the lower limit value Yc) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. can.

By storing the relationship shown in FIG. 6 in the memory 204 in advance as a map or a relational expression, the suppression rate calculation unit 84 calculates the suppression rate Rc2 based on the solar radiation amount Si detected by the solar radiation amount sensor 26. be able to.

Returning to FIG. 4, the multiplier 85 calculates the cooling suppression rate Rcs by multiplying the suppression rate Rc1 and the suppression rate Rc2 (Rcs=Rc1×Rc2). The multiplier 85 inputs the calculated cooling suppression rate Rcs to the first input terminal of the switching unit 86 .

The switching unit 86 has a first input terminal, a second input terminal, and an output terminal. The switching unit 86 receives the cooling suppression rate Rcs from the multiplier 85 at a first input terminal, and receives the upper limit value 100 (%) of the cooling suppression rate Rcs at a second input terminal. The switching unit 86 selects one of the inputs and outputs it to the output terminal in response to an execution command from the main control unit 72. Specifically, when the execution command is at the H level, which is the activation level, the switching unit 86 outputs the cooling suppression rate Rcs (=Rc1×Rc2) received by the first input terminal to the output terminal. When the execution command is at the L level, which is the deactivation level, the switching unit 86 outputs the upper limit value (100 (%)) of the cooling suppression rate received by the second input terminal to the output terminal.

The multiplier 88 corrects the opening command Vc* by multiplying the opening command Vc* generated by the controller 742 by the cooling suppression rate Rcs from the switching unit 86 (Vc*=Vc**×Rcs). . When Rcs=100%, the opening command Vc* is output to the cold water two-way valve 34 without being substantially corrected. On the other hand, when Rcs<100%, the opening command Vc* is corrected to a value smaller than the original opening command Vc* according to the magnitude of the cooling suppression rate Rcs, and the opening command Vc* is corrected to a value smaller than the original opening command Vc*, It is output to the direction valve 34. The cold water two-way valve 34 adjusts the amount of heat medium supplied to the cold water coil 32 by controlling its opening according to the opening command Vc*.

FIG. 7 is a diagram showing an example of the opening degree control of the cold water two-way valve 34 in the air conditioning control section 74. FIG. 7 shows an example of the relationship between the indoor temperature Tr and the opening command Vc* of the two-way cold water valve 34. The horizontal axis in FIG. 7 indicates the indoor temperature Tr, and the vertical axis indicates the opening command Vc*. The waveform k1 shows the relationship during the cooling-main period. Waveform k2 shows the relationship during the heating-main period.

As shown in the waveform k1, in the cooling-main period, when the indoor temperature Tr is below the cooling set temperature Tsc, the opening degree command Vc* is set to 0% (fully closed). When the indoor temperature Tr exceeds the cooling set temperature Tsc, the opening command Vc* changes in proportion to the deviation ΔTc of the indoor temperature Tr with respect to the cooling set temperature Tsc. Note that when the indoor temperature Tr exceeds a predetermined threshold temperature Tcth, the opening degree command Vc* is fixed at 100% (fully open).

On the other hand, in the heating-main period, the opening degree command Vc* is multiplied by the cooling suppression rate Rcs calculated based on the detected values of the outside air temperature To and the amount of solar radiation Si. Therefore, the opening degree command Vc* for a certain indoor temperature Tr is smaller than the opening degree command Vc* for the same indoor temperature Tr during the cooling-main period. That is, the amount of heat medium supplied to the chilled water coil 32 at a certain indoor temperature Tr is smaller during the heating-main period than during the cooling-main period. As a result, the cooling capacity during the heating-dominant period is suppressed.

In this way, when performing cooling operation during the main heating period, by executing processing to suppress the amount of heat medium supplied to the chilled water coil 32 and reducing the cooling capacity, cooling operation and subsequent cooling operation are performed. The energy consumption of the air conditioner 10 during the heating operation performed can be reduced.

(Configuration of heating control unit)
Next, the functional configuration of the heating control section 76 will be described with reference to FIGS. 8 to 12.

FIG. 8 is a block diagram showing an example of the configuration of the heating control section 76 shown in FIG. 2. As shown in FIG. As shown in FIG. 8, the heating control unit 76 sets the opening command Vh* of the hot water two-way valve 38 by feedback control to make the indoor temperature Tr detected by the temperature/humidity sensor 22 follow the heating set temperature Tsh. configured to generate.

Specifically, heating control section 76 includes a subtracter 760, a controller 762, and a correction section 764. The subtracter 760 calculates the deviation ΔTh of the indoor temperature Tr from the heating set temperature Tsh (ΔTh=Tsh−Tr).

The controller 762 receives the deviation ΔTh calculated by the subtractor 760 and performs a control calculation to set the deviation ΔTh to 0, thereby generating an opening command Vh* for the hot water two-way valve 38. That is, the opening degree command Vh* of the hot water two-way valve 38 corresponds to the control amount for setting Tr=Tsh. Note that a PI controller, a PID controller, or the like can be used as the controller 762.

The correction unit 764 adjusts the opening degree of the hot water two-way valve 38 based on the execution command given from the main control unit 72, the outside temperature To detected by the outside temperature sensor 24, and the amount of solar radiation Si detected by the amount of solar radiation sensor 26. Correct command Vh*.

Specifically, the main control unit 72 determines whether the current time corresponds to the cooling-main period based on current time information given from a clock (not shown). When the current time corresponds to the cooling-main period, the main control unit 72 generates an execution command for processing to suppress the amount of heat medium supplied to the hot water coil 36. If the current time does not correspond to the cooling-based period, the main control unit 72 does not generate the execution command. That is, when performing heating operation during the cooling-main period, the main control unit 72 causes the heating control unit 76 to execute a process of suppressing the amount of heat medium supplied to the hot water coil 36.

As described above, during the cooling-main period, cooling operation is the main operation. On the other hand, since the air conditioner 10 is configured to be able to switch between cooling operation and heating operation depending on the indoor temperature Tr, during the cooling-main period, when the indoor temperature Tr falls below the heating set temperature Tsh, , the air conditioner 10 may temporarily perform heating operation.

For example, if the indoor temperature Tr is lower than the heating set temperature Tsh during a few hours in the early morning when the outside temperature is low and the amount of sunlight is low, the heating operation is temporarily turned off to raise the indoor temperature Tr to the heating set temperature Tsh. is executed. Thereafter, when the indoor temperature Tr rises above the cooling set temperature Tsc to follow the rise in the outside air temperature and the increase in the amount of solar radiation, the air conditioning operation shifts to the cooling operation.

In such a case, as the outside temperature rises and the amount of solar radiation increases, the indoor room 52 tends to be heated excessively due to the synergistic effect with the heating operation, resulting in a wasteful increase in the energy consumption of the air conditioner 10 during the heating operation. Become.

Further, after the transition to the cooling operation, the cooling operation is performed so as to cancel out the heating effect of the immediately preceding heating operation. This is because the heating effect from the previous heating operation acts as a cooling load. That is, immediately after the start of the cooling operation, the cooling operation is performed so as to remove the amount of heat supplied to the room 52 by the immediately preceding heating operation. As a result, the energy consumption of the air conditioner 10 during cooling operation increases unnecessarily.

In order to address the above-mentioned concerns, in the present embodiment, the heating effect is suppressed by reducing the heating capacity of the air conditioner 10 during the cooling-main period, as described below.

Specifically, when receiving the execution command from the main control unit 72, the correction unit 764 corrects the opening command Vh* so as to reduce the opening command Vh* generated by the controller 762. . That is, when performing heating operation during the cooling-main period, the correction unit 764 reduces the supply amount of the heat medium supplied to the hot water coil 36 from the supply amount according to the deviation ΔTh, thereby improving the air conditioner 10. heating capacity is reduced. FIG. 9 is a block diagram showing a configuration example of the correction section 764 shown in FIG. 8.

As shown in FIG. 9, the correction section 764 includes suppression rate calculation sections 92 and 94, multipliers 95 and 98, and a switching section 96. The suppression rate calculation units 92 and 94 and the multiplier 95 calculate a correction coefficient for correcting the opening degree command Vh*. This correction coefficient represents the degree to which the amount of heat medium supplied to the hot water coil 36 is suppressed (that is, corresponds to the degree to which the heating capacity is suppressed), and therefore is defined as a "heating suppression rate Rhs" in this specification. .

The correction unit 764 corrects the opening command Vh* by multiplying the opening command Vh* given from the controller 762 by the heating suppression rate Rhs (Vh*=Vh**×Rhs). The heating suppression rate Rhs can take a value from 0 (%) to 100 (%) depending on the outside air temperature To and the amount of solar radiation Si. Note that when Rhs=100 (%), Vh*=Vh*, and the opening command Vh* is not substantially corrected. Therefore, the amount of heat medium supplied to the hot water coil 36 (heating capacity) is not suppressed. As the heating suppression rate Rhs decreases from 100 (%), the extent to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases.

The heating suppression rate Rhs is calculated using a suppression rate Rh1 for suppressing the heating capacity against a decrease in outside air temperature, and a suppression rate Rh2 for suppressing the heating capacity against a decrease in the amount of solar radiation.

As described above, both the outside air temperature and the amount of solar radiation lead to an increase in the indoor temperature and become a cooling load, but they act as positive factors during heating operation. Therefore, in the present embodiment, the correction unit 764 is configured to calculate the heating suppression rate Rhs according to the outside air temperature To and the amount of solar radiation Si, thereby suppressing the amount of heat supplied to the indoor room 52 due to the outside temperature and the amount of solar radiation. do. This makes it possible to reduce the amount of heat removed from the room 52 during cooling operation.

Specifically, the suppression rate calculation unit 92 calculates the suppression rate Rh1 based on the outside air temperature To detected by the outside air temperature sensor 24. The suppression rate Rh1 corresponds to an example of a "third suppression rate." FIG. 10 is a diagram schematically showing an example of the relationship between the outside air temperature To and the suppression rate Rh1. The horizontal axis in FIG. 10 indicates the outside air temperature To, and the vertical axis indicates the suppression rate Rh1. The suppression rate Rh1 can take a value from 0 (%) to 100 (%).

In the example of FIG. 10, when To≦To3, the suppression rate Rh1 is set to 100 (%). When To3<To≦To4, the suppression rate Rh1 is set to decrease as the outside temperature To increases. When To>To4, the suppression rate Rh1 is set to Xh (%) (0<Xh<100). Xh (%) corresponds to the lower limit of the suppression rate Rh1. By setting the lower limit Xh to the suppression rate Rh1, it is possible to suppress the comfort of the room 52 from being impaired due to suppression of the heating capacity.

As the suppression rate Rh1 decreases from 100 (%), the degree to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases. As shown in FIG. 10, by decreasing the suppression rate Rh1 as the outside air temperature To increases, that is, by increasing the extent to which the heating capacity is suppressed, the indoor 52 Excessive heating can be suppressed. Thereby, energy consumption during heating operation can be reduced. Further, since the amount of heat removed from the room 52 when shifting from heating operation to cooling operation can be reduced, energy consumption during cooling operation can be reduced.

The relationship between the outside temperature To and the suppression rate Rh1 (temperatures To3, To4, and lower limit value Xh) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. .

By storing the relationship shown in FIG. 10 in the memory 204 in advance as a map or relational expression, the suppression rate calculation unit 92 calculates the suppression rate Rh1 based on the outside air temperature To detected by the outside air temperature sensor 24. be able to.

Returning to FIG. 9, the suppression rate calculation unit 94 calculates the suppression rate Rh2 based on the amount of solar radiation Si detected by the amount of solar radiation sensor 26. The suppression rate Rh2 corresponds to an example of a "fourth suppression rate." FIG. 11 is a diagram schematically showing an example of the relationship between the amount of solar radiation Si and the suppression rate Rh2. The horizontal axis in FIG. 11 indicates the amount of solar radiation Si, and the vertical axis indicates the suppression rate Rh2. The suppression rate Rh2 can take a value of 0 (%) to 100 (%).

In the example of FIG. 11, when Si≦Si3, the suppression rate Rh2 is set to 100 (%). When Si3<Si≦Si4, the suppression rate Rh2 is set to decrease as the amount of solar radiation Si increases. When Si>Si4, the suppression rate Rh2 is set to Yh (%) (0<Yh<100). Yh (%) corresponds to the lower limit of the suppression rate Rh2. By providing the lower limit value Yh for the suppression rate Rh2, it is possible to suppress the comfort of the room 52 from being impaired due to suppression of the heating capacity.

Similar to the suppression rate Rh1 shown in FIG. 10, as the suppression rate Rh2 decreases from 100 (%), the degree to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases. As shown in FIG. 11, by decreasing the suppression rate Rc2 as the solar radiation amount Si increases, that is, by increasing the extent to which the heating capacity is suppressed, the indoor 52 can be suppressed from being excessively heated, energy consumption during heating operation can be reduced. Furthermore, since the amount of heat removed from the room 52 when shifting from heating operation to cooling operation can be reduced, energy consumption during cooling operation can be reduced.

The relationship between the amount of solar radiation Si and the suppression rate Rh2 (the amount of solar radiation Si3, Si4 and the lower limit value Yh) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. can.

By storing the relationship shown in FIG. 11 in the memory 204 in advance as a map or relational expression, the suppression rate calculation unit 94 calculates the suppression rate Rh2 based on the solar radiation amount Si detected by the solar radiation sensor 26. be able to.

Returning to FIG. 9, the multiplier 95 calculates the heating suppression rate Rhs by multiplying the suppression rate Rh1 and the suppression rate Rh2 (Rhs=Rh1×Rh2). The multiplier 95 inputs the calculated heating suppression rate Rhs to the first input terminal of the switching unit 96 .

The switching unit 96 has a first input terminal, a second input terminal, and an output terminal. The switching unit 96 receives the heating suppression rate Rhs from the multiplier 95 at its first input terminal, and receives the upper limit value 100 (%) of the heating suppression rate Rhs at its second input terminal. The switching unit 96 selects one of the inputs and outputs it to the output terminal in response to an execution command from the main control unit 72. Specifically, when the execution command is at the H level, which is the activation level, the switching unit 96 outputs the heating suppression rate Rhs (=Rh1×Rh2) received by the first input terminal to the output terminal. When the execution command is at the L level, which is the deactivation level, the switching unit 96 outputs the upper limit value (100 (%)) of the heating suppression rate received by the second input terminal to the output terminal.

The multiplier 98 corrects the opening command Vh* by multiplying the opening command Vh* generated by the controller 762 by the heating suppression rate Rhs from the switching unit 96 (Vh*=Vh**×Rhs). . When Rhs=100%, the opening command Vh* is output to the hot water two-way valve 38 without being substantially corrected. On the other hand, when Rhs<100%, the opening command Vh* is corrected to a value smaller than the original opening command Vh* according to the magnitude of the heating suppression rate Rhs, and the opening command Vh* is corrected to a value smaller than the original opening command Vh*. It is output to the direction valve 38. The hot water two-way valve 38 adjusts the amount of heat medium supplied to the hot water coil 36 by controlling its opening according to the opening command Vh*.

FIG. 12 is a diagram showing an example of the opening degree control of the hot water two-way valve 38 in the heating control section 76. FIG. 12 shows an example of the relationship between the room temperature Tr and the opening command Vh* of the hot water two-way valve 38. The horizontal axis in FIG. 12 indicates the indoor temperature Tr, and the vertical axis indicates the opening command Vh*. Waveform k3 shows the relationship during the heating-main period. Waveform k4 shows the relationship during the cooling-main period.

As shown in waveform k3, in the heating-main period, when the indoor temperature Tr is equal to or higher than the heating set temperature Tsh, the opening degree command Vh* is set to 0% (fully closed). When the indoor temperature Tr falls below the heating set temperature Tsh, the opening degree command Vh* changes in proportion to the deviation ΔTh of the indoor temperature Tr with respect to the heating set temperature Tsh. Note that when the indoor temperature Tr becomes less than a predetermined threshold temperature Thth, the opening degree command Vh* is fixed at 100% (fully open).

On the other hand, in the cooling-main period, the opening degree command Vh* is multiplied by the heating suppression rate Rhs calculated based on the detected values of the outside air temperature To and the amount of solar radiation Si. Therefore, the opening degree command Vh* for a certain indoor temperature Tr is smaller than the opening degree command Vh* for the same indoor temperature Tr during the heating main period. That is, the amount of heat medium supplied to the hot water coil 36 at a certain indoor temperature Tr is smaller during the cooling-main period than during the heating-main period. As a result, the heating capacity during the cooling-intensive period is suppressed.

In this way, when heating operation is performed during the cooling-main period, the heating capacity is reduced by executing processing to suppress the amount of heat medium supplied to the hot water coil 36, so that heating operation and subsequent heating operation are performed. The energy consumption of the air conditioner 10 during the cooling operation performed can be reduced.

(flowchart)
FIG. 13 is a flowchart illustrating a processing procedure for controlling the opening degrees of the two-way cold water valve 34 and the two-way hot water valve 38 according to the present embodiment. The control process according to the flowchart shown in FIG. 13 is repeatedly executed by the controller 20.

As shown in FIG. 13, the controller 20 detects the indoor temperature Tr based on the output signal of the temperature/humidity sensor 22 in step (hereinafter simply referred to as S) 01. The controller 20 compares the indoor temperature Tr and the cooling set temperature Tsc in S02. If the indoor temperature Tr is higher than the cooling set temperature Tsc (YES in S02), the controller 20 controls the opening degree of the two-way cold water valve 34 according to the steps shown in S03 to S11.

Specifically, in S03, the controller 20 sets the opening degree command Vc* of the cold water two-way valve 34 by executing a control calculation to set the deviation ΔTc between the cooling set temperature Tsc and the room temperature Tr to 0. generate.

In S04, the controller 20 determines whether the current time corresponds to a heating-based period based on current time information given from a clock (not shown). If the current time does not correspond to the heating-based period (NO determination in S04), the controller 20 skips the processes in S05 to S10.

On the other hand, if the current time corresponds to the heating-main period (YES determination in S04), the controller 20 executes processing to suppress the amount of heat medium supplied to the cold water coil 32. Specifically, the controller 20 detects the outside air temperature To based on the output signal of the outside air temperature sensor 24 in S05. In S06, the controller 20 calculates the suppression rate Rc1 according to the detected value of the outside air temperature To. In S06, the controller 20 calculates the suppression rate Rc1 based on the detected value of the outdoor temperature To by referring to the relationship between the outdoor temperature To and the suppression rate Rc1 stored in advance in the memory 204 (see FIG. 5). do.

Next, the controller 20 detects the amount of solar radiation Si based on the output signal of the solar radiation amount sensor 26 in S07. In S08, the controller 20 calculates the suppression rate Rc2 according to the detected value of the solar radiation amount Si. In S08, the controller 20 calculates the suppression rate Rc2 based on the detected value of the solar radiation Si by referring to the relationship between the solar radiation Si and the suppression rate Rc2 stored in advance in the memory 204 (see FIG. 6). do.

In S09, the controller 20 calculates the cooling suppression rate Rcs by multiplying the suppression rate Rc1 calculated in S06 and the suppression rate Rc2 calculated in S08 (Rcs=Rc1×Rc2). In S10, the controller 20 corrects the opening command Vc* by multiplying the opening command Vc* generated in S03 by the cooling suppression rate Rcs calculated in S09 (Vc*=Vc**×Rcs ).

The controller 20 adjusts the supply of the heat medium to the cold water coil 32 by controlling the opening degree of the cold water two-way valve 34 in accordance with the opening degree command Vc* in S11. When the opening degree command Vc* is corrected in S10, the opening degree of the cold water two-way valve 34 is controlled according to the corrected opening degree command Vc*.

Returning to S02, if the indoor temperature Tr is equal to or lower than the cooling set temperature Tsc (NO determination in S02), the controller 20 compares the indoor temperature Tr and the heating set temperature Tsh in S12. If the indoor temperature Tr is lower than the heating set temperature Tsh (YES in S12), the controller 20 controls the opening degree of the hot water two-way valve 38 according to the steps shown in S13 to S21.

Specifically, in S13, the controller 20 sets the opening degree command Vh* of the hot water two-way valve 38 by executing a control calculation to set the deviation ΔTh between the heating set temperature Tsh and the indoor temperature Tr to 0. generate.

In S14, the controller 20 determines whether the current time corresponds to the cooling-main period based on current time information given from a clock (not shown). If the current time does not correspond to the cooling-main period (NO determination in S14), the controller 20 skips the processing in S15 to S20.

On the other hand, if the current time corresponds to the cooling-main period (YES in S14), the controller 20 executes processing to suppress the amount of heat medium supplied to the hot water coil 36. Specifically, the controller 20 detects the outside air temperature To based on the output signal of the outside air temperature sensor 24 in S15. In S16, the controller 20 calculates the suppression rate Rh1 according to the detected value of the outside air temperature To. In S16, the controller 20 calculates the suppression rate Rh1 based on the detected value of the outdoor temperature To by referring to the relationship between the outdoor temperature To and the suppression rate Rh1 stored in advance in the memory 204 (see FIG. 10). do.

Next, the controller 20 detects the amount of solar radiation Si based on the output signal of the solar radiation amount sensor 26 in S17. In S18, the controller 20 calculates the suppression rate Rh2 according to the detected value of the amount of solar radiation Si. In S18, the controller 20 calculates the suppression rate Rh2 based on the detected value of the solar radiation Si by referring to the relationship between the solar radiation Si and the suppression rate Rh2 stored in advance in the memory 204 (see FIG. 11). do.

In S19, the controller 20 calculates the heating suppression rate Rhs by multiplying the suppression rate Rh1 calculated in S16 and the suppression rate Rh2 calculated in S18 (Rhs=Rh1×Rh2). In S20, the controller 20 corrects the opening command Vh* by multiplying the opening command Vh* generated in S13 by the heating suppression rate Rhs calculated in S19 (Vh*=Vh**×Rhs ).

In S21, the controller 20 adjusts the supply of the heat medium to the hot water coil 36 by controlling the opening degree of the hot water two-way valve 38 according to the opening degree command Vh*. When the opening degree command Vh* is corrected in S20, the opening degree of the hot water two-way valve 38 is controlled according to the corrected opening degree command Vh*.

(Example of air conditioning system operation)
Next, an example of the operation of the air conditioning system according to this embodiment will be described with reference to FIGS. 14 and 15.

FIG. 14 is a diagram showing a temporal change in outside air temperature in one day during a cooling-intensive period. The horizontal axis in FIG. 14 indicates time, and the vertical axis indicates the detected value of the outside air temperature To by the outside air temperature sensor 24. In the example of FIG. 14, the time period from 8:30 a.m. to 6:00 p.m. ), and the time periods from 0:00 a.m. to 8:30 a.m. and from 6:00 p.m. to 11:00 p.m. are the time periods during which the air conditioner 10 is in a stopped state.

As shown in FIG. 14, the outside air temperature To becomes low during the night when there is no sunlight, and gradually rises after sunrise (around 5 a.m.). As the outside air temperature To rises, the amount of heat entering the room 52 gradually increases, so the indoor temperature Tr gradually rises.

However, for several hours after starting the air conditioner 10, the indoor temperature Tr may be lower than the heating set temperature Tsh. In this case, the air conditioner 10 performs heating operation in order to raise the indoor temperature Tr to the heating set temperature Tsh. A region k1 in the figure corresponds to a time period in which heating operation is performed.

During execution of the heating operation, the outside air temperature To rises and the amount of heat entering the room 52 increases. Furthermore, the amount of heat generated by the human body and instruments in the room 52 also increases. Therefore, the amount of heat supplied to the indoor room 52 increases due to the synergistic effects of the heating operation, the outside air temperature, the human body, etc., and the indoor temperature Tr increases. The controller 20 calculates a heating suppression rate Rhs according to the outside air temperature To and the amount of solar radiation Si, and corrects the opening degree command Vh* of the hot water two-way valve 38 using the calculated heating suppression rate Rhs.

FIG. 10 shows the suppression rate Rh1(ta) calculated from the outside air temperature To at time ta immediately after the start of heating operation, and the suppression rate Rh1(tb) calculated from outside air temperature To at time tb during heating operation. It is shown. FIG. 11 shows the suppression rate Rh2(ta) calculated from the solar radiation amount Si at time ta and the suppression rate Rh2(tb) calculated from the solar radiation amount Si at time tb.

The controller 20 calculates the heating suppression rate Rhs(ta) at time ta by multiplying Rh1(ta) and Rh2(ta). The controller 20 calculates the heating suppression rate Rhs(tb) at time tb by multiplying Rh1(tb) and Rh2(tb). Since Rh1(ta)>Rh1(tb) and Rh2(ta)>Rh2(tb), Rhs(ta)>Rhs(tb).

As described above, during heating operation, the heating suppression rate Rhs decreases as the outside air temperature To and the amount of solar radiation Si increase, so that the amount of heat medium supplied to the hot water coil 36 gradually decreases. As a result, the amount of heat supplied to the room 52 gradually decreases, so that excessive heating can be suppressed. Moreover, the cooling load when shifting to cooling operation can be reduced. Therefore, the energy consumption of the air conditioner 10 during the heating operation and the cooling operation performed subsequent to the heating operation can be reduced.

FIG. 15 is a diagram showing a temporal change in outside air temperature in one day during a heating-based period. The horizontal axis in FIG. 15 indicates time, and the vertical axis indicates the detected value of the outside air temperature To by the outside air temperature sensor 24. In addition, in the example of FIG. 15, similarly to FIG. 14, the air conditioner 10 is operated to condition the air in the room 52 during the time period from 8:30 a.m. to 6:00 p.m. (18:00). The time periods (air conditioning time periods) in which the air conditioner 10 is in a stopped state are defined as 0:00 a.m. to 8:30 a.m. and 6:00 p.m. to 11:00 p.m.

As shown in FIG. 15, the outside air temperature To becomes low during the night when there is no sunlight, and gradually rises after sunrise (around 5 a.m.). As the outside air temperature To rises, the amount of heat entering the room 52 gradually increases, so the indoor temperature Tr gradually rises.

When the air conditioner 10 is started, since the indoor temperature Tr is lower than the heating set temperature Tsh, the air conditioner 10 performs heating operation. During the heating operation, the amount of heat entering the room 52 increases due to the rise in the outside air temperature To and the increase in the amount of solar radiation, and the amount of heat generated by the human body and appliances in the room 52 also increases. The amount of heat supplied to the indoor room 52 increases due to the synergistic effects of the heating operation, the outside air temperature, the human body, etc., and the indoor temperature Tr rises.

As a result, the indoor temperature Tr may exceed the cooling set temperature Tsc during several hours around 1:00 pm when the outside air temperature To reaches its peak. In this case, the air conditioner 10 performs cooling operation in order to lower the indoor temperature Tr to the cooling set temperature Tsc. Region k2 in the figure corresponds to the time period in which the cooling operation is performed.

During execution of the above-mentioned cooling operation, the outside air temperature To gradually decreases, and the amount of heat entering the room 52 decreases. Furthermore, the amount of solar radiation Si gradually decreases, and the amount of heat entering the room 52 decreases. The amount of heat removed from the room 52 increases due to the synergistic effect of the cooling operation, the outside air temperature, and the amount of solar radiation, thereby lowering the room temperature Tr. The controller 20 calculates a cooling suppression rate Rcs according to the outside air temperature To and the amount of solar radiation Si, and corrects the opening degree command Vc* of the cold water two-way valve 34 using the calculated cooling suppression rate Rcs.

FIG. 5 shows the suppression rate Rc1(tc) calculated from the outside air temperature To at time tc during cooling operation, and the suppression rate Rc1(td) calculated from outside air temperature To at time td immediately before the end of cooling operation. has been done. FIG. 6 shows the suppression rate Rc2(tc) calculated from the solar radiation amount Si at time tc and the suppression rate Rc2(td) calculated from the solar radiation amount Si at time td.

The controller 20 multiplies Rc1(tc) and Rc2(tc) to calculate the cooling suppression rate Rcs(tc) at time tc. The controller 20 calculates the cooling suppression rate Rcs(td) at time td by multiplying Rc1(td) and Rc2(td). Since Rc1(tc)>Rc1(td) and Rc2(tc)>Rc2(td), Rcs(tc)>Rcs(td). During the cooling operation, the cooling suppression rate Rcs decreases as the outside air temperature To decreases and the solar radiation amount Si decreases, so that the amount of heat medium supplied to the chilled water coil 32 gradually decreases. Therefore, the amount of heat removed from the room 52 gradually decreases, and excessive cooling can be suppressed. Moreover, the heating load when shifting to heating operation can be reduced. As a result, the energy consumption of the air conditioner 10 during the cooling operation and the heating operation performed subsequent to the cooling operation can be reduced.

<Other configuration examples>
In the embodiment described above, a configuration example has been described in which the cooling suppression rate Rcs in the heating-main period and the heating suppression rate Rhs in the cooling-main period are calculated according to the outside air temperature To and the amount of solar radiation Si. By configuring the cooling suppression rate Rcs and the heating suppression rate Rhs to be calculated according to at least one of the amount of solar radiation Si and the amount of solar radiation Si, the same effects as in the present embodiment described above can be obtained.

Therefore, it is also possible to adopt a configuration in which the cooling suppression rate Rcs and the heating suppression rate Rhs are calculated according to either the outside air temperature To or the amount of solar radiation Si. Even in this case, during cooling operation during the heating-main operation period, the cooling suppression rate Rcs is calculated such that the upper limit is 100% and the value decreases as the outside temperature To decreases or the solar radiation amount Si decreases. . Thereby, the energy consumption of the air conditioner 10 can be reduced during the cooling operation and during the heating operation performed subsequent to the cooling operation.

Further, during heating operation during the cooling-main operation period, the heating suppression rate Rhs is calculated such that the upper limit value is 100% and the value decreases as the outside temperature To increases or the solar radiation amount Si increases. Thereby, the energy consumption of the air conditioner 10 can be reduced during the heating operation and during the cooling operation performed subsequent to the heating operation.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The present invention is indicated by the scope of the claims rather than the above description, and it is intended that all changes within the scope and meaning equivalent to the scope of the claims are included.

10 air conditioner, 11,580 inlet, 12,560 outlet, 14 supply air duct, 15 ventilation duct, 16 return air duct, 20 controller, 22 temperature and humidity sensor, 24 outside temperature sensor, 26 solar radiation sensor, 30 Filter, 32 Cold water coil, 33 Cold water circulation path, 34 Cold water two-way valve, 36 Hot water coil, 37 Hot water circulation path, 38 Hot water two-way valve, 40 Humidifier, 41 Humidification supply path, 42 Humidification two-way valve, 44 fan, 50 building, 52 room, 54 window, 56 ceiling, 58 floor, 70 input section, 72 main control section, 74 cooling control section, 76 heating control section, 78 humidity control section, 80 fan control section, 82, 84, 92, 94 Suppression rate calculation unit, 85, 88, 95, 98 Multiplier, 86, 96 Switching unit, 100 Air conditioning system, 202 CPU, 204 Memory, 206 I/O circuit, 740, 760 Subtractor, 742 , 762 controller, 744, 764 correction unit, Tr indoor temperature, To outside temperature, Si solar radiation, Tsc cooling set temperature, Tsh heating set temperature, Vc*, Vh* opening command, Rcs cooling suppression rate, Rhs heating suppression rate, Rc1, Rc2, Rh1, Rh2 inhibition rate.

Claims (9)

An air conditioner that harmonizes the air inside a building,
a temperature sensor installed in the room to detect the room temperature;
and a controller that switches between cooling operation and heating operation of the air conditioner according to the indoor temperature,
The air conditioner includes:
a first heat exchanger that cools the air by heat exchange between a first heat medium and the air;
a second heat exchanger that heats the air by heat exchange between a second heat medium and the air;
a first valve provided in the first heat medium circulation path and opened during the cooling operation;
a second valve provided in the second heat medium circulation path and opened during the heating operation;
a fan that causes the air to flow through the first heat exchanger and the second heat exchanger,
The controller includes:
During the cooling operation, the first heat medium is supplied to the first heat exchanger by controlling the opening degree of the first valve according to a first deviation between the cooling set temperature and the indoor temperature. a cooling control unit that adjusts the supply amount of
During the heating operation, the second heat medium is supplied to the second heat exchanger by controlling the opening degree of the second valve according to a second deviation between the heating set temperature and the indoor temperature. and a heating control unit that adjusts the supply amount of
When performing the cooling operation in the heating-main period in which the indoor air is mainly conditioned by the heating operation, the cooling control unit controls the amount of the first heat medium supplied to the first heat exchanger. is reduced from the supply amount of the first heat medium according to the first deviation,
When performing the heating operation in the cooling-main period in which the indoor air is mainly conditioned by the cooling operation, the heating control unit controls the supply amount of the second heat medium to the second heat exchanger. The air conditioning system is configured to reduce the supply amount of the second heat medium according to the second deviation. an outside temperature sensor that detects outside temperature;
It further includes a solar radiation sensor that detects the solar radiation amount,
The cooling control unit includes:
a first controller that generates a first opening command for the first valve by a control calculation using the first deviation as input;
The air conditioning system according to claim 1, further comprising a first correction unit that corrects the first opening command based on at least one of the outside air temperature and the amount of solar radiation during the heating main period. The first correction unit is configured to correct the first opening command by multiplying the first opening command generated by the first controller by a cooling suppression rate,
The air conditioning system according to claim 2, wherein the cooling suppression rate is calculated such that the upper limit value is 100%, and the value decreases as the outside air temperature decreases or the amount of solar radiation decreases. The first correction unit adjusts the cooling suppression rate by multiplying a first suppression rate calculated according to the outside temperature and a second suppression rate calculated according to the amount of solar radiation. configured to calculate,
The first suppression rate is calculated such that the upper limit value is 100%, and the value decreases as the outside temperature decreases,
The air conditioning system according to claim 3, wherein the second suppression rate is calculated such that the upper limit value is 100%, and the value decreases as the amount of solar radiation decreases. The air conditioning system according to claim 4, wherein each of the first suppression rate and the second suppression rate has a lower limit value greater than 0%. an outside temperature sensor that detects outside temperature;
It further includes a solar radiation sensor that detects the solar radiation amount,
The heating control section includes:
a second controller that generates a second opening command for the second valve by a control calculation using the second deviation as input;
The air conditioning system according to claim 1, further comprising a second correction unit that corrects the second opening command based on at least one of the outside air temperature and the amount of solar radiation during the cooling-main period. The second correction unit is configured to correct the second opening command by multiplying the second opening command generated by the second controller by a heating suppression rate,
The air conditioning system according to claim 6, wherein the heating suppression rate is calculated such that the upper limit value is 100%, and the value decreases as the outside air temperature increases or the amount of solar radiation increases. The second correction unit adjusts the heating suppression rate by multiplying a third suppression rate calculated according to the outside air temperature and a fourth suppression rate calculated according to the amount of solar radiation. configured to calculate,
The third suppression rate is calculated such that the upper limit is 100% and the value decreases as the outside temperature increases,
The air conditioning system according to claim 7, wherein the fourth suppression rate is calculated such that the upper limit value is 100%, and the value decreases as the amount of solar radiation increases. The air conditioning system according to claim 8, wherein each of the third suppression rate and the fourth suppression rate has a lower limit value greater than 0%.

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