JP7444230B1 - Air conditioning equipment - Google Patents

Abstract

[Problem] Improve comfort. [Solution] The air conditioning system includes a pump 8 that circulates water in a water circuit 4, a plurality of indoor heat exchangers 7-1 to 7-3 provided in the water circuit 4, and a plurality of indoor heat exchangers 7-1. A plurality of flow rate adjustment valves 6-1 to 6-3 provided for each of ~7-3 and a plurality of water temperature sensors 26-1 to 26-3 provided for each of a plurality of indoor heat exchangers 7-1 to 7-3. , a water-refrigerant heat exchanger 5 that adjusts the water temperature, and a pump 8 so that a predetermined flow rate of water circulates through the water circuit 4, and a plurality of indoor heat exchangers 7-1 to 7-3. The heat load and the maximum load of an indoor heat exchanger that is not at the maximum load so that the flow rate of water flowing through the indoor heat exchanger with the maximum load is equal to the first target flow rate calculated based on the maximum value of the heat load. A plurality of flow rate adjustment valves 6-1 to 6-3 are arranged so that the flow rate of water flowing through the indoor heat exchanger is equal to the second target flow rate calculated based on the temperature of the water flowing into the indoor heat exchanger. and an outdoor unit control device 28 for controlling the outdoor unit. [Selection diagram] Figure 1

Description

The technology of the present disclosure relates to a heating and cooling device.

It is equipped with a refrigerant circuit in which refrigerant is circulated by the operation of a compressor, and a water circuit in which water is circulated by the operation of a water pump, and a heat exchanger which heats or cools the water by exchanging heat between the refrigerant and water. A hot water heating device is known in which an indoor radiator provided in a water circuit blows air heated by water heated by a heat exchanger into the room to heat the room (Patent Document 1). Specifically, the rotation speed of the compressor is controlled so that the outgoing temperature, which is the temperature of the water flowing into the indoor radiator, is the target value, and the return temperature, which is the temperature of the water flowing out from the indoor radiator, and the outgoing temperature are controlled. The rotation speed of the water pump is controlled so that the difference between the With this technology, water can be supplied to the indoor radiator at an appropriate flow rate depending on the magnitude of the heat radiation load on the indoor radiator. Moreover, such a hot water heating device can cool a room by having an indoor radiator blow out air cooled by water cooled by a heat exchanger into the room.

Japanese Patent Application Publication No. 2007-287895

However, when multiple indoor radiators are installed in parallel in the water circuit of such a hot water heating system, it is not possible to adjust the temperature of each indoor radiator according to the size of the heat radiation load. There is a problem in that the blowing air temperature required for each indoor radiator cannot be obtained, and the comfort of the room in which each indoor radiator is placed deteriorates.

The disclosed technology has been made in view of this point, and aims to provide a heating and cooling device that improves comfort.

A heating and cooling device according to one aspect of the present disclosure includes a pump that circulates a heat medium inside a heat medium circuit, a plurality of indoor heat exchangers provided in the heat medium circuit and provided in parallel with each other, and a plurality of indoor heat exchangers. A plurality of flow rate adjustment valves provided for each heat exchanger, a plurality of heat medium temperature detection units provided for each plurality of indoor heat exchangers, a heat source device that adjusts the temperature of the heat medium, and a heat source device for controlling the heat medium temperature of the plurality of indoor heat exchangers. When operating multiple units in which medium flows, the pump is controlled so that a predetermined flow rate of heat medium circulates through the heat medium circuit, and the indoor heat exchanger with the largest heat load is selected among the multiple indoor heat exchangers. The maximum heat load indoor heat exchanger is assumed to be the maximum heat load indoor heat exchanger, and the maximum heat load target flow rate is calculated based on the heat load of the maximum heat load indoor heat exchanger, and the flow rate of the heat medium flowing through the maximum heat load indoor heat exchanger is the maximum heat load target flow rate. The flow rate adjustment valve corresponding to the maximum heat load indoor heat exchanger among the plurality of indoor heat exchangers is controlled so that the maximum heat load is equal to The indoor heat exchanger is the residual heat load indoor heat exchanger, and the heat load of the residual heat load indoor heat exchanger and the maximum heat load indoor heat exchange measured by the heat medium temperature detection unit corresponding to the maximum heat load indoor heat exchanger. In order to make the flow rate of the heat medium flowing through the heat exchanger in the residual heat load room equal to the residual heat load target flow rate calculated based on the temperature of the heat medium flowing into the heat exchanger, and a control section that controls a flow rate adjustment valve corresponding to the heat exchanger.

The disclosed heating and cooling device can improve comfort.

FIG. 1 is a refrigerant circuit diagram showing an air conditioner equipped with a heating and cooling device according to a first embodiment. FIG. 2 is a block diagram showing the outdoor unit control device. FIG. 3 is a diagram showing a pump target flow rate table. FIG. 4 is a diagram showing a flow rate adjustment valve target flow rate table. FIG. 5 is a flowchart showing the control operation. FIG. 6 is a graph showing the relationship between water temperature, heating capacity, and flow rate in the indoor heat exchanger.

EMBODIMENT OF THE INVENTION Below, the air conditioning apparatus concerning embodiment which this application discloses is demonstrated in detail with reference to drawings. Note that the technology of the present disclosure is not limited by the following description. In addition, in the following description, the same components are given the same reference numerals and redundant explanations will be omitted.

The heating and cooling device of Example 1 is provided in an air conditioner 1, as shown in FIG. FIG. 1 is a refrigerant circuit diagram showing an air conditioner 1 equipped with a heating and cooling device according to a first embodiment. The air conditioner 1 includes an outdoor unit 2 and a plurality of indoor units 3-1 to 3-3. The outdoor unit 2 is installed outdoors. The first indoor unit 3-1 of the plurality of indoor units 3-1 to 3-3 is installed in the first room of the plurality of rooms cooled and heated by the air conditioner 1, and the second indoor unit 3-1 is installed in the first room of the plurality of rooms cooled and heated by the air conditioner 1. 2 is placed in the second room, and the third indoor unit 3-3 is placed in the third room.

The air conditioner 1 further includes a water circuit 4 (heat medium circuit). The water circuit 4 is connected to a water refrigerant heat exchanger 5 (heat source device), a plurality of flow rate adjustment valves 6-1 to 6-3, a plurality of indoor heat exchangers 7-1 to 7-3, and a pump 8. The water is circulated by driving the pump 8. The first indoor heat exchanger 7-1 among the plurality of indoor heat exchangers 7-1 to 7-3 is arranged inside the first indoor unit 3-1, and the second indoor heat exchanger 7-2 is arranged inside the first indoor unit 3-1. , are arranged inside the second indoor unit 3-2, and the third indoor heat exchanger 7-3 is arranged inside the third indoor unit 3-3.

Among the plurality of flow rate adjustment valves 6-1 to 6-3, the first flow rate adjustment valve 6-1 is provided upstream of the first indoor heat exchanger 7-1. The second flow rate regulating valve 6-2 is provided upstream of the second indoor heat exchanger 7-2. The third flow rate regulating valve 6-3 is provided upstream of the third indoor heat exchanger 7-3. The first flow rate regulating valve 6-1 provided upstream of the first indoor heat exchanger 7-1 is arranged inside the first indoor unit 3-1 and connected to the first indoor heat exchanger 7-1. ing. The second flow rate regulating valve 6-2 provided on the upstream side of the second indoor heat exchanger 7-2 is arranged inside the second indoor unit 3-2 and connected to the second indoor heat exchanger 7-2. ing. The third flow regulating valve 6-3 provided upstream of the third indoor heat exchanger 7-3 is arranged inside the third indoor unit 3-3 and is connected to the third indoor heat exchanger 7-3. ing. The plurality of flow rate regulating valves 6-1 to 6-3 are connected in parallel to each other on the downstream side of the water-refrigerant heat exchanger 19 via the branch pipe 11.

The pump 8 is arranged inside the outdoor unit 2. The pump 8 is connected to a plurality of indoor heat exchangers 7-1 to 7-3 via a confluence pipe 12. The water-refrigerant heat exchanger 19 is arranged inside the outdoor unit 2 and connected to the pump 8 via piping.

The pump 8 supplies water supplied from the plurality of indoor heat exchangers 7-1 to 7-3 to the water-refrigerant heat exchanger 19 via the confluence pipe 12, and circulates the water in the water circuit 4. The water-refrigerant heat exchanger 19 exchanges heat between the water supplied from the pump 8 and the refrigerant. The branch pipe 11 distributes the water heat-exchanged by the water-refrigerant heat exchanger 19 to the plurality of flow rate regulating valves 6-1 to 6-3. The first flow rate adjustment valve 6-1 adjusts the flow rate of water flowing through the first indoor heat exchanger 7-1. The second flow rate adjustment valve 6-2 adjusts the flow rate of water flowing through the second indoor heat exchanger 7-2. The third flow rate adjustment valve 6-3 adjusts the flow rate of water flowing through the third indoor heat exchanger 7-3.

Water/refrigerant heat exchanger 19 is connected to refrigerant circuit 14 . The refrigerant circuit 14 includes a compressor 15, a four-way valve 16, an outdoor heat exchanger 17, an expansion valve 18, and a water/refrigerant heat exchanger 19 (heat medium/refrigerant heat exchanger). The refrigerant circuit 14 further includes a suction pipe 21 and a discharge pipe 22. The compressor 15 includes a rotating body, and as the rotating body rotates, it compresses the gaseous refrigerant supplied to the compressor 15 through the suction pipe 21 and discharges the compressed gaseous refrigerant to the discharge pipe 22. do. The amount of refrigerant discharged by the compressor 15 per unit time increases as the number of rotations of the rotating body per unit time increases.

The four-way valve 16 is connected to a suction pipe 21 and a discharge pipe 22, and is connected to the compressor 15 via the suction pipe 21 and the discharge pipe 22. The four-way valve 16 is further connected to an outdoor heat exchanger 17 via a refrigerant pipe, and to a water-refrigerant heat exchanger 19 via a refrigerant pipe. The four-way valve 16 includes a valve body, and when the valve body is placed in the heating position, the refrigerant circuit 14 is switched to the heating cycle, and when the valve body is placed in the cooling position, the refrigerant circuit 14 is switched to the cooling cycle. It will be done. When the refrigerant circuit 14 is switched to the heating cycle, the discharge pipe 22 is connected to the water-refrigerant heat exchanger 19 through the four-way valve 16, and the outdoor heat exchanger 17 is connected to the suction pipe through the four-way valve 16. 21. When the refrigerant circuit 14 is switched to the cooling cycle, the discharge pipe 22 is connected to the outdoor heat exchanger 17 through the four-way valve 16, and the water-refrigerant heat exchanger 19 is connected to the suction pipe through the four-way valve 16. 21.

The expansion valve 18 is connected to the outdoor heat exchanger 17 via a refrigerant pipe. The water-refrigerant heat exchanger 19 is connected to the expansion valve 18 via a refrigerant pipe.

The air conditioner 1 includes an outflow temperature sensor 23, a return temperature sensor 24, a plurality of room temperature sensors 25-1 to 25-3, and a plurality of water temperature sensors 26-1 to 26-3 (a plurality of heat medium temperature detection units). It also has more. The outgoing temperature sensor 23 is disposed inside the outdoor unit 2 and measures the temperature of water flowing from the water-refrigerant heat exchanger 19 to the branch pipe 11. The return temperature sensor 24 is arranged inside the outdoor unit 2 and measures the temperature of the water supplied from the pump 8 to the water-refrigerant heat exchanger 19.

Among the plurality of room temperature sensors 25-1 to 25-3, the first room temperature sensor 25-1 is arranged inside the first indoor unit 3-1, and the second room temperature sensor 25-2 is arranged inside the second indoor unit 3. -2, and the third room temperature sensor 25-3 is arranged inside the third indoor unit 3-3. The first room temperature sensor 25-1 measures the temperature of the first room in which the first indoor unit 3-1 is installed. The second room temperature sensor 25-2 measures the temperature of the second room in which the second indoor unit 3-2 is installed. The third room temperature sensor 25-3 measures the temperature of the third room in which the third indoor unit 3-3 is installed.

The first water temperature sensor 26-1 of the plurality of water temperature sensors 26-1 to 26-3 is arranged inside the first indoor unit 3-1, and the second water temperature sensor 26-2 is arranged inside the second indoor unit 3. -2, and the third water temperature sensor 26-3 is arranged inside the third indoor unit 3-3. The first water temperature sensor 26-1 measures the temperature of water supplied to the first indoor heat exchanger 7-1. The second water temperature sensor 26-2 measures the temperature of water supplied to the second indoor heat exchanger 7-2. The third water temperature sensor 26-3 measures the temperature of water supplied to the third indoor heat exchanger 7-3.

The air conditioner 1 further includes a plurality of indoor unit control devices 27-1 to 27-3 and an outdoor unit control device 28 (control unit). The first indoor unit control device 27-1 of the plurality of indoor unit control devices 27-1 to 27-3 is arranged inside the first indoor unit 3-1, and the second indoor unit control device 27-2 is arranged inside the first indoor unit 3-1. , are arranged inside the second indoor unit 3-2, and the third indoor unit control device 27-3 is arranged inside the third indoor unit 3-3. The first indoor unit control device 27-1 controls the first indoor unit 3-1, the second indoor unit control device 27-2 controls the second indoor unit 3-2, and the third indoor unit control device 27-3 controls the third indoor unit 3-3. Each of the plurality of indoor unit control devices 27-1 to 27-3 is electrically connected to the outdoor unit control device 28 and mutually transmits information for controlling the air conditioner 1.

The outdoor unit control device 28 is arranged inside the outdoor unit 2. FIG. 2 is a block diagram showing the outdoor unit control device 28. As shown in FIG. The outdoor unit control device 28 includes a storage device 31 and a CPU 32 (Central Processing Unit). The storage device 31 stores a computer program installed in the outdoor unit control device 28, and stores information used by the CPU 32. The CPU 32 acquires information from the outgoing temperature sensor 23, the return temperature sensor 24, and the plurality of indoor unit control devices 27-1 to 27-3 by executing a computer program installed in the outdoor unit control device 28, A plurality of flow rate adjustment valves 6-1 to 6-3, a pump 8, a compressor 15, and a four-way valve 16 are controlled.

According to the computer program installed in the outdoor unit control device 28, the outdoor unit control device 28 executes each of a plurality of functions. The outdoor unit control device 28 includes a four-way valve control section 33, a compressor control section 34, a pump control section 35, and a flow rate adjustment valve control section 36 as a plurality of functions. The four-way valve control unit 33 controls the four-way valve 16 so that the refrigerant circuit 14 is switched to a heating cycle or a cooling cycle in response to a user's operation of the air conditioner 1. The compressor control unit 34 controls the compressor 15 so that an appropriate flow rate of refrigerant circulates through the refrigerant circuit 14. The pump control unit 35 controls the pump 8 so that water at an appropriate flow rate circulates in the water circuit 4. The flow rate adjustment valve control unit 36 controls the plurality of flow rate adjustment valves 6-1 to 6-3 so that an appropriate flow rate of water flows through each of the plurality of flow rate adjustment valves 6-1 to 6-3.

The storage device 31 further stores a pump target flow rate table 37 and a flow rate adjustment valve target flow rate table 38. FIG. 3 is a diagram showing the pump target flow rate table 37. The pump target flow rate table 37 associates a plurality of combinations of one of the plurality of temperature differences 41 and one of the plurality of outgoing temperatures 42 with a plurality of individual operation target flow rates 43 . Specifically, the larger the temperature difference 41 is, the larger the individual operation target flow rate 43 is set, and the smaller the outgoing temperature 42 is, the larger the individual operation target flow rate 43 is set. FIG. 4 is a diagram showing the flow rate adjustment valve target flow rate table 38. The flow rate adjustment valve target flow rate table 38 includes a plurality of combinations of capacity 46 and water flow rate 47 that are associated with water temperature 45 .

The operations performed by the air conditioner 1 include cooling operation, heating operation, and control operation.
[Cooling operation]
The cooling operation is performed, for example, when the air conditioner 1 is operated by the user to perform the cooling operation. The outdoor unit control device 28 controls the four-way valve 16 and switches the refrigerant circuit 14 to the cooling cycle when the air conditioner 1 performs cooling operation. The outdoor unit control device 28 controls the compressor 15 and compresses the low-pressure gas phase refrigerant supplied to the compressor 15 via the suction pipe 21. The low pressure gas phase refrigerant is compressed by the compressor 15 and becomes high pressure gas phase refrigerant. Compressor 15 further discharges high-pressure vapor phase refrigerant into discharge pipe 22 . The high-pressure gas phase refrigerant discharged into the discharge pipe 22 is supplied to the outdoor heat exchanger 17 because the refrigerant circuit 14 is switched to the cooling cycle.

The outdoor heat exchanger 17 exchanges heat between the high-pressure gas phase refrigerant supplied from the four-way valve 16 and outside air. The high-pressure gas-phase refrigerant radiates heat to the outside air in the outdoor heat exchanger 17 and condenses, becoming a supercooled high-pressure liquid-phase refrigerant. That is, the outdoor heat exchanger 17 functions as a condenser when the air conditioner 1 performs cooling operation. The high-pressure liquid phase refrigerant flowing out from the outdoor heat exchanger 17 is supplied to the expansion valve 18 .

The expansion valve 18 adjusts the flow rate of the refrigerant flowing from the outdoor heat exchanger 17 to the water-refrigerant heat exchanger 19, and reduces the pressure of the high-pressure liquid phase refrigerant supplied from the outdoor heat exchanger 17. The high-pressure liquid phase refrigerant is reduced in pressure by the expansion valve 18 and becomes a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant flowing out from the expansion valve 18 is supplied to the water-refrigerant heat exchanger 19 .

The water-refrigerant heat exchanger 19 exchanges heat between the low-pressure gas-liquid two-phase refrigerant supplied from the expansion valve 18 and the water circulating in the water circuit 4 . The low-pressure gas-liquid two-phase refrigerant is heated and evaporated in the water-refrigerant heat exchanger 19, and becomes a low-pressure gas-phase refrigerant. That is, the water-refrigerant heat exchanger 19 functions as an evaporator when the air conditioner 1 performs cooling operation. The low-pressure gas phase refrigerant flowing out from the water-refrigerant heat exchanger 19 is supplied to the four-way valve 16 . The low-pressure gas phase refrigerant supplied to the four-way valve 16 is supplied to the suction pipe 21 and sucked into the compressor 15 via the suction pipe 21 because the refrigerant circuit 14 is switched to the cooling cycle.

[Heating operation]
The heating operation is performed, for example, when the air conditioner 1 is operated by the user to perform the heating operation. The outdoor unit control device 28 controls the four-way valve 16 and switches the refrigerant circuit 14 to a heating cycle when the air conditioner 1 performs heating operation. The outdoor unit control device 28 controls the compressor 15 and compresses the low-pressure gas phase refrigerant supplied to the compressor 15 via the suction pipe 21. The low pressure gas phase refrigerant is compressed by the compressor 15 and becomes high pressure gas phase refrigerant. Compressor 15 further discharges high-pressure vapor phase refrigerant into discharge pipe 22 . The high-pressure gas phase refrigerant discharged into the discharge pipe 22 is supplied to the water-refrigerant heat exchanger 19 because the refrigerant circuit 14 is switched to the heating cycle.

The water-refrigerant heat exchanger 19 exchanges heat between the high-pressure gas-phase refrigerant supplied from the four-way valve 16 and the water circulating in the water circuit 4 . The high-pressure gas-phase refrigerant radiates heat to water in the water-refrigerant heat exchanger 19, and becomes a supercooled high-pressure liquid-phase refrigerant. That is, the water-refrigerant heat exchanger 19 functions as a condenser when the air conditioner 1 performs heating operation. The high-pressure liquid phase refrigerant flowing out from the water-refrigerant heat exchanger 19 is supplied to the expansion valve 18 .

The expansion valve 18 adjusts the flow rate of the refrigerant flowing from the water-refrigerant heat exchanger 19 to the outdoor heat exchanger 17, and reduces the pressure of the high-pressure liquid phase refrigerant supplied from the water-refrigerant heat exchanger 19. The high-pressure liquid phase refrigerant is reduced in pressure by the expansion valve 18 and becomes a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant flowing out from the expansion valve 18 is supplied to the outdoor heat exchanger 17.

The outdoor heat exchanger 17 exchanges heat between the low-pressure gas-liquid two-phase refrigerant supplied from the expansion valve 18 and the outside air. The low-pressure gas-liquid two-phase refrigerant is heated in the outdoor heat exchanger 17 and becomes a low-pressure gas-phase refrigerant. That is, the outdoor heat exchanger 17 functions as an evaporator when the air conditioner 1 performs heating operation. The low-pressure gas phase refrigerant flowing out from the outdoor heat exchanger 17 is supplied to the four-way valve 16. The low-pressure gas phase refrigerant supplied to the four-way valve 16 is supplied to the suction pipe 21 and sucked into the compressor 15 via the suction pipe 21 because the refrigerant circuit 14 is switched to the heating cycle.

When the air conditioner 1 performs a cooling operation or a heating operation, the outdoor unit control device 28 further controls the pump 26 and supplies water supplied from the merging pipe 12 to the water-refrigerant heat exchanger 19, Water is circulated through the water circuit 4. The water heat exchanged with the refrigerant in the water-refrigerant heat exchanger 19 is supplied to the plurality of flow rate regulating valves 6-1 to 6-3 via the branch pipe 11. The first flow rate adjustment valve 6-1 adjusts the flow rate of refrigerant flowing into the first indoor heat exchanger 7-1 from the branch pipe 11, and adjusts the flow rate of water flowing through the first indoor heat exchanger 7-1. . The second flow rate adjustment valve 6-2 adjusts the flow rate of refrigerant flowing into the second indoor heat exchanger 7-2 from the branch pipe 11, and adjusts the flow rate of water flowing through the second indoor heat exchanger 7-2. . The third flow rate adjustment valve 6-3 adjusts the flow rate of refrigerant flowing into the third indoor heat exchanger 7-3 from the branch pipe 11, and adjusts the flow rate of water flowing through the third indoor heat exchanger 7-3. .

The first indoor heat exchanger 7-1 exchanges heat between the water flowing through the first indoor heat exchanger 7-1 and the air in the first chamber. The first indoor unit control device 27-1 controls the first indoor unit 3-1 and converts the air heat-exchanged with water in the first indoor heat exchanger 7-1 into an air volume determined based on the user's operation. The air is blown into the first room, heating and cooling the first room. The second indoor heat exchanger 7-2 exchanges heat between the water flowing through the second indoor heat exchanger 7-2 and the air in the second chamber. The second indoor unit control device 27-2 controls the second indoor unit 3-2 and converts the air heat-exchanged with water in the second indoor heat exchanger 7-2 into an air volume determined based on the user's operation. The air is blown into the second room, heating and cooling the second room. The third indoor heat exchanger 7-3 exchanges heat between the water flowing through the third indoor heat exchanger 7-3 and the air in the third chamber. The third indoor unit control device 27-3 controls the third indoor unit 3-3 and converts the air heat-exchanged with water in the third indoor heat exchanger 7-3 into an air volume determined based on the user's operation. The air is blown into the third room, heating and cooling the third room. The water flowing through the plurality of indoor heat exchangers 7-1 to 7-3 is supplied to the pump 8 via the confluence pipe 12.

[Control operation]
The control operation is always performed when heating or cooling operation is being performed. FIG. 5 is a flowchart showing the control operation. When the user does not want to cool or heat the first room, the user operates the first indoor unit 3-1 to stop the first indoor unit 3-1. When the user wants to cool or heat the first room, the user operates the first indoor unit 3-1 and sets the first set temperature in the first indoor unit 3-1. The user operates the second indoor unit 3-2 in the same manner as the first indoor unit 3-1, such as stopping the second indoor unit 3-2 or setting the second indoor unit 3-2 to the second set temperature. or set. The user operates the third indoor unit 3-3 in the same manner as the first indoor unit 3-1, such as stopping the third indoor unit 3-3 or setting the third indoor unit 3-3 to the third set temperature. or set.

The first indoor unit control device 27-1 acquires the first room temperature measured by the first room temperature sensor 25-1 from the first room temperature sensor 25-1, and obtains the first room temperature measured by the first water temperature sensor 26-1. The water temperature is obtained from the first water temperature sensor 26-1. The first indoor unit control device 27-1 calculates a first required temperature range based on the first set temperature and the first room temperature. The first required temperature range indicates the temperature range of water that should be supplied to the first indoor heat exchanger 7-1 when the first indoor unit 3-1 cools or heats the first room to the first set temperature. There is. Furthermore, the first required temperature range is included in the temperature range specific to the first indoor heat exchanger 7-1. The unique temperature range indicates the temperature range of water that can be supplied to the first indoor heat exchanger 7-1, that is, the upper limit of the first required temperature range is the temperature range of water that can be supplied to the first indoor heat exchanger 7-1. The lower limit of the first required temperature range is higher than the lower limit of the temperature range. The first required temperature range has a specific range for each of the indoor units 3-1 to 3-3 depending on the capacity of the indoor heat exchanger, heat transfer performance, etc. Similarly to the first indoor unit control device 27-1, the second indoor unit control device 27-2 also obtains the second room temperature from the second room temperature sensor 25-2, and obtains the second water temperature from the second water temperature sensor 26-2. , and calculate the second required temperature range. Similarly to the first indoor unit control device 27-1, the third indoor unit control device 27-3 also obtains the third room temperature from the third room temperature sensor 25-3, and obtains the third water temperature from the third water temperature sensor 26-3. , and calculate the third required temperature range.

The outdoor unit control device 28 transmits information on whether or not the plurality of indoor units 3-1 to 3-3 are stopped when the cooling operation or the heating operation is performed to the plurality of indoor unit control devices 27-1. ~27-3, and determines whether multiple unit operation or individual operation is being executed (step S1). In multiple unit operation, two or more of the indoor units 3-1 to 3-3 are operating, and two or more of the indoor heat exchangers 7-1 to 7-3 are not operating. Water is flowing through the indoor heat exchanger (hereinafter referred to as the operation indoor heat exchanger) corresponding to the indoor unit being installed. In standalone operation, only one of the indoor units 3-1 to 3-3 is not stopped, and only one of the indoor units 3-1 to 3-3 is in standalone operation. Another indoor unit that is different from the above has stopped. That is, in the individual operation, water flows only to the individually operated indoor heat exchanger installed in the individually operated indoor unit among the plurality of indoor heat exchangers 7-1 to 7-3, and Water is not flowing to other indoor heat exchangers different from the independently operated indoor heat exchanger among the containers 7-1 to 7-3. The outdoor unit control device 28 detects that the air conditioner 1 is operating multiple units when two or more of the indoor units 3-1 to 3-3 are not stopped. Determine (step S1, Yes). The outdoor unit control device 28 determines that the air conditioner 1 is operating independently when only one of the plurality of indoor units 3-1 to 3-3 is operating (step S1 , No).

When it is determined that a plurality of air conditioners 1 are operating (Step S1, Yes), the outdoor unit control device 28 controls the pump 8 to change the flow rate of water circulating through the water circuit 4. Water is circulated through the water circuit 4 at a predetermined flow rate determined in advance according to the number of connected indoor units so as to prevent the water from leaking (step S2). The predetermined flow rate at this time is set to such a flow rate that the capacity will not be insufficient even if the rated capacity is required for all of the plurality of indoor units 3-1 to 3-3.

Next, the outdoor unit control device 28 calculates the temperature difference between the indoor units that are running, calculates the target flow rate of each indoor unit that is running based on the temperature difference, and adjusts the target flow rate to the indoor unit that is running. to control the plurality of flow rate regulating valves 6-1 to 6-3 (step 3). Specifically, first, the outdoor unit control device 28 calculates the heat load of the indoor unit that is performing the target flow rate operation. As an example, a case where all of the plurality of indoor units 3-1 to 3-3 are in operation will be described. Based on the first room temperature acquired from the first indoor unit control device 27-1 among the plurality of room temperatures and the first set temperature acquired from the first indoor unit control device 27-1 among the plurality of set temperatures. A first heat load among the plurality of heat loads is calculated. The first heat load indicates the heat load of the first indoor heat exchanger 7-1, and corresponds to the capacity required when the first indoor unit 3-1 cools and heats the first room to the first set temperature, The larger the absolute value of the first temperature difference obtained by subtracting the first set temperature from the first room temperature, the larger the difference. Similarly to the first heat load, the outdoor unit control device 28 calculates, for example, the second heat load and the third heat load of the plurality of heat loads for both the indoor units 3-2 and 3-3. The second heat load indicates the heat load of the second indoor heat exchanger 7-2, and the third heat load indicates the heat load of the third indoor heat exchanger 7-3.

The outdoor unit control device 28 sets the indoor heat exchanger with the maximum heat load among the plurality of heat loads as the maximum load indoor heat exchanger. The outdoor unit control device 28 acquires a first target flow rate (maximum heat load target flow rate) based on the maximum value of the heat load. The first target flow rate is the water flow rate required in the indoor heat exchanger with the maximum load, and a value that increases as the maximum heat load value increases is stored in advance in the storage device 31. The outdoor unit control device 28 controls the maximum load indoor heat exchanger among the plurality of flow rate adjustment valves 6-1 to 6-3 so that the flow rate of water flowing to the maximum load indoor heat exchanger becomes equal to the first target flow rate. Controls the maximum load flow rate adjustment valve provided in the

Furthermore, the outdoor unit control device 28 acquires the outgoing temperature measured by the outgoing temperature sensor 23 from the outgoing temperature sensor 23. The outdoor unit control device 28 controls the flow rate adjustment valve target for the operating indoor heat exchanger (residual heat load indoor heat exchanger) that is different from the maximum load indoor heat exchanger among the plurality of indoor heat exchangers 7-1 to 7-3. With reference to the flow rate table 38, a second target flow rate (residual heat load target flow rate) is calculated based on the heat load of the heat exchanger in the operating room among the plurality of heat loads and the outgoing temperature. Specifically, the outdoor unit control device 28 selects the water temperature closest to the outgoing temperature from the plurality of water temperatures 45 (selects the higher water temperature if there are two closest water temperatures), and selects that water temperature from the plurality of capacities 46. The capacity closest to the heat load of the heat exchanger in the driver's room is selected from several capacities corresponding to the determined water temperature, and the water flow rate corresponding to the selected capacity is selected from the plurality of water flow rates 47. The second target flow rate is equal to the selected water flow rate. The second target flow rate is smaller than the first target flow rate, and increases as the heat load on the heat exchanger in the operating room increases. The outdoor unit control device 28 is provided in the heat exchanger in the operating room of the plurality of flow rate regulating valves 6-1 to 6-3 so that the flow rate of water flowing into the heat exchanger in the operating room is equal to the second target flow rate. Controls the operating load flow rate adjustment valve.

Next, the outdoor unit control device 28 calculates a temperature control range based on a plurality of required temperature ranges (first required temperature range to third required temperature range). The upper limit of the temperature control range indicates the lowest temperature among the upper limits of each of the plurality of required temperature ranges, and the lower limit of the temperature control range indicates the highest temperature maximum value among the lower limits of each of the plurality of required temperature ranges. The outdoor unit control device 28 calculates the target outgoing temperature when multiple units are operated based on the maximum heat load value and the temperature control range. When operating multiple units, the target outgoing temperature is included in multiple required temperature ranges, and when cooling operation is being performed, the higher the maximum heat load value is, the lower the target temperature is, and when heating operation is being performed, the higher the maximum heat load value is, the lower the The higher the value, the higher the value. The outdoor unit control device 28 calculates the target compressor rotation speed when multiple units are operated based on the target outgoing temperature when multiple units are operated. The target compressor rotation speed when operating multiple units is defined as the temperature of water flowing from the water-refrigerant heat exchanger 19 to the branch pipe 11 (outgoing temperature ) is calculated so that it is equal to the target outgoing temperature when multiple units are operated. The outdoor unit control device 28 controls the compressor 15 so that the rotation speed of the compressor 15 becomes equal to the target compressor rotation speed when multiple units are operated (step S4).

FIG. 6 is a graph showing the relationship between water temperature, heating capacity, and water flow rate in the indoor heat exchanger. The heating capacity corresponding to a certain water temperature and a certain water flow rate is when, under predetermined conditions, the temperature of the water flowing into the indoor heat exchanger is equal to that water temperature, and the heating capacity corresponds to the temperature of the water flowing into the indoor heat exchanger per unit time. It shows the heating capacity achieved when the water flow rate is equal to the water flow rate. Examples of the conditions include the temperature of the room in which the indoor unit in which the indoor heat exchanger is installed, and the volume of air that blows the air whose temperature has been adjusted by the indoor heat exchanger into the room. When multiple units of the air conditioner 1 are being operated, the air conditioner 1 adjusts the flow rate of water flowing to the multiple indoor heat exchangers 7-1 to 7-3 to the multiple indoor heat exchangers 7-1 to 7-3. When adjustments are not made according to each heat load, water temperature, heating capacity, and water flow rate do not match the relationship shown in the graph of Figure 6, resulting in excessive cooling and heating capacity in multiple indoor units 3-1 to 3-3. This may result in under- or under-fitting, resulting in decreased comfort.

In the air conditioner 1, when a plurality of units are operated, the flow rate of water flowing to the plurality of indoor heat exchangers 7-1 to 7-3 is equal to that of the plurality of indoor heat exchangers 7-1 to 7-3. By adjusting according to the heat load, the capacity of each of the plurality of indoor heat exchangers 7-1 to 7-3 is adjusted according to the heat load of each of the plurality of indoor heat exchangers 7-1 to 7-3. I can develop my abilities. That is, in the air conditioner 1, the relationship between the water temperature, water flow rate, and heat load in each of the plurality of indoor heat exchangers 7-1 to 7-3 is the same as the water temperature, water flow rate, and heating capacity shown in the graph of FIG. The plurality of flow rate regulating valves 6-1 to 6-3 can be controlled so as to approximately match the relationship shown in FIG. Therefore, the air conditioner 1 can prevent the refrigerant from circulating excessively or insufficiently to each of the plurality of indoor heat exchangers 7-1 to 7-3. As a result, the plurality of indoor units 3-1 to 3-3 can be appropriately cooled and heated, and comfort can be improved.

When it is determined that the air conditioner 1 is operating independently (Step S1, No), the outdoor unit control device 28 controls the operation of the plurality of indoor heat exchangers 7-1 to 7-3. One of the indoor units is used as an independently operated indoor heat exchanger. The outdoor unit control device 28 controls the flow rate adjustment valves so that the single operation flow rate adjustment valve corresponding to the single operation indoor heat exchanger among the plurality of flow rate adjustment valves 6-1 to 6-3 is fully opened, and the plurality of flow rate adjustment valves Control the plurality of flow rate adjustment valves 6-1 to 6-3 so that the stop flow rate adjustment valve, which is a flow rate adjustment valve different from the single operation flow rate adjustment valve among 6-1 to 6-3, is fully closed ( Step S5).

Next, the outdoor unit control device 28 calculates a target flow rate of the independently operated indoor unit, and controls the pump 8 according to the target flow rate (step S6). Specifically, first, the outgoing temperature is acquired from the outgoing temperature sensor 23.

Next, the outdoor unit control device 28 acquires the return temperature measured by the return temperature sensor 24 from the return temperature sensor 24 . The outdoor unit control device 28 calculates the temperature difference based on the outgoing temperature and the returning temperature. The temperature difference is equal to the outgoing temperature minus the return temperature.

The outdoor unit control device 28 refers to the pump target flow rate table 37 and calculates the target flow rate during independent operation based on the outgoing temperature and temperature difference of the independent operation indoor heat exchanger. Specifically, the outdoor unit control device 28 selects the temperature difference closest to the obtained temperature difference from the plurality of temperature differences 41 in the pump target flow rate table 37, and selects the temperature difference closest to the current outflow temperature from the plurality of outflow temperatures 42. Select values that are close to each other. The individual operation target flow rate is equal to the individual operation target flow rate associated with the combination of the temperature difference and the outgoing temperature selected from the plurality of individual operation target flow rates 43. The outdoor unit control device 28 controls the pump 8 so that the flow rate at which the pump 8 circulates water in the water circuit 4 becomes equal to the target flow rate during independent operation (step S6).

The outdoor unit control device 28 calculates the target outgoing temperature during independent operation based on the heat load of the indoor heat exchanger in independent operation. The target outgoing temperature during standalone operation is lower when the heat load of the standalone indoor heat exchanger is higher when the cooling operation is being performed, and when the heat load of the standalone indoor heat exchanger is The higher the load, the higher the value. The outdoor unit control device 28 calculates the target compressor rotation speed during independent operation based on the target outgoing temperature during independent operation. The target compressor rotation speed during independent operation is the temperature (outgoing temperature) of water flowing from the water-refrigerant heat exchanger 19 to the branch pipe 11 when the rotation speed of the compressor 15 is equal to the target compressor rotation speed during independent operation. It is calculated so that it is equal to the target outgoing temperature during independent operation. The outdoor unit control device 28 controls the compressor 15 so that the rotation speed of the compressor 15 becomes equal to the target compressor rotation speed during independent operation (step S7).

In the air conditioner 1, when the individual operation is performed, the flow rate of water flowing into the individual operation indoor heat exchanger is adjusted according to the temperature difference of the individual operation indoor heat exchanger and the incoming temperature. The pump 8 can be controlled so that the relationship between the water temperature, water flow rate, and heating capacity in the individually operated indoor heat exchanger matches the relationship between the water temperature, water flow rate, and heating capacity shown in the graph of FIG. . Therefore, the air conditioner 1 can prevent the refrigerant from circulating excessively or insufficiently to the individually operated indoor heat exchanger. As a result, the individually operated indoor unit can be appropriately cooled and heated, and comfort can be improved. Furthermore, the air conditioner 1 can reduce the flow rate of the pump 8 without unnecessarily increasing the flow rate of the pump 8 when the heat load of the independently operated indoor heat exchanger is small, and at this time, the power consumption can be reduced. can be reduced.

[Effects of the heating and cooling device of Example 1]
The air conditioning system of the first embodiment includes a pump 8, a plurality of indoor heat exchangers 7-1 to 7-3, a plurality of flow rate adjustment valves 6-1 to 6-3, and a plurality of water temperature sensors 26-1 to 26-3. It includes a water refrigerant heat exchanger 19 and an outdoor unit control device 28. Pump 8 circulates water through water circuit 4 . The plurality of indoor heat exchangers 7-1 to 7-3 are provided in parallel to each other in the water circuit 4. The plurality of flow rate adjustment valves 6-1 to 6-3 are provided for each of the plurality of indoor heat exchangers 7-1 to 7-3. The plurality of water temperature sensors 26-1 to 26-3 are provided for each of the plurality of indoor heat exchangers 7-1 to 7-3. The water-refrigerant heat exchanger 19 adjusts the temperature of the water circulating in the water circuit 4 .

The outdoor unit control device 28 controls the pump 8 so that a predetermined flow rate of water circulates through the water circuit 4 during a multi-unit operation in which water flows to the plurality of indoor heat exchangers 7-1 to 7-3. do. When operating a plurality of indoor heat exchangers 7-1 to 7-3, the outdoor unit control device 28 further calculates the first target flow rate based on the maximum value of the heat loads of the plurality of indoor heat exchangers 7-1 to 7-3. The outdoor unit control device 28 controls the flow rate of water flowing through the maximum load indoor heat exchanger having the maximum heat load among the plurality of indoor heat exchangers 7-1 to 7-3 to be equal to the first target flow rate. , controls the maximum load flow rate adjustment valve provided in the maximum load indoor heat exchanger among the plurality of flow rate adjustment valves 6-1 to 6-3. When operating a plurality of indoor heat exchangers, the outdoor unit control device 28 further controls the heat load of another indoor heat exchanger that is different from the maximum load indoor heat exchanger among the plurality of indoor heat exchangers 7-1 to 7-3. , the temperature of the water flowing into the maximum load indoor heat exchanger measured by the maximum load water temperature sensor installed in the maximum load indoor heat exchanger among the plurality of water temperature sensors 26-1 to 26-3. 2 Calculate the target flow rate. The outdoor unit control device 28 controls other indoor heat exchangers among the plurality of flow rate adjustment valves 6-1 to 6-3 so that the flow rate of water flowing through the other indoor heat exchangers becomes equal to the second target flow rate. Controls other flow rate regulating valves installed in the

In the case where a plurality of indoor units 3-1 to 3-3 are in operation, the air-conditioning device controls the flow rate of water flowing to the plurality of indoor heat exchangers 7-1 to 7-3. If adjustments are not made in accordance with each of the heat loads 1 to 7-3, excessive or insufficient cooling and heating capacity may occur, resulting in decreased comfort. The air conditioning system of the first embodiment can adjust the flow rate of water flowing into the plurality of indoor heat exchangers 7-1 to 7-3 according to the heat load of the plurality of indoor heat exchangers 7-1 to 7-3. This can prevent each of the plurality of indoor units 3-1 to 3-3 from heating or cooling excessively or insufficiently, thereby improving comfort.

Further, the water-refrigerant heat exchanger 19 of the air-conditioning device of the first embodiment has a refrigerant circuit 14 including a compressor 15 and a water-refrigerant heat exchanger 19 that exchanges heat between water and refrigerant, and the refrigerant circulates. It is something to do. The outdoor unit control device 28 controls the heat load on the individually operated indoor heat exchanger during an individual operation in which water flows only to one of the plurality of indoor heat exchangers 7-1 to 7-3. Calculate the target flow rate during standalone operation based on. The outdoor unit control device 28 controls the pump 8 so that the flow rate of water flowing into the independent operation indoor heat exchanger becomes equal to the target flow rate during independent operation. During the individual operation, the outdoor unit control device 28 further controls the compressor rotation speed of the compressor 15 to be equal to the target compressor rotation speed during the individual operation, which is calculated based on the heat load in the individual operation indoor heat exchanger. The compressor 15 is controlled so that the When operating multiple units, the outdoor unit control device 28 controls the compressor 15 so that the compressor rotation speed becomes equal to the target compressor rotation speed for multiple unit operation, which is calculated based on the maximum value of the heat load. Control. The air conditioning system of the first embodiment can control the compressor 15 of the water/refrigerant heat exchanger 19 so that the refrigerant does not circulate in the refrigerant circuit 14 in an excessive or insufficient amount, and can control the compressor 15 of the water/refrigerant heat exchanger 19, and 3 can prevent excessive or insufficient heating and cooling and improve comfort.

Further, the air-conditioning device of the first embodiment further includes a storage device 31, a forward temperature sensor 23, and a return temperature sensor 24. The storage device 31 stores a pump target flow rate table 37 and a flow rate adjustment valve target flow rate table 38. The pump target flow rate table 37 associates a plurality of combinations of temperature difference and thermal load with a plurality of individual operation target flow rates. The flow rate adjustment valve target flow rate table 38 associates a plurality of combinations of heat load and temperature with a plurality of water flow rates 47. The outgoing temperature sensor 23 measures the temperature of water whose temperature has been adjusted by the water-refrigerant heat exchanger 19. The return temperature sensor 24 measures the temperature of water flowing out from the plurality of indoor heat exchangers 7-1 to 7-3.

During individual operation, the outdoor unit control device 28 refers to the pump target flow rate table 37 and determines the outgoing temperature measured by the outgoing temperature sensor 23 and the outgoing temperature among the plurality of individual operation target flow rates 43. A target flow rate during independent operation corresponding to the combination of the return temperature measured by the return temperature sensor 24 and the temperature difference is calculated. When operating multiple units, the outdoor unit control device 28 refers to the flow rate adjustment valve target flow rate table 38 and determines the combination of heat load and outgoing temperature in other indoor heat exchangers among the multiple water flow rates 47. A second target flow rate corresponding to is calculated. The heating and cooling device of the first embodiment can calculate the target flow rate and the second target flow rate during independent operation in a short time, and can improve comfort.

Further, the heating and cooling apparatus of the first embodiment further includes a plurality of indoor units 3-1 to 3-3 each having a plurality of indoor heat exchangers 7-1 to 7-3. The first indoor unit 3-1 of the plurality of indoor units 3-1 to 3-3 includes a first room temperature sensor 25-1 that measures the temperature inside the room in which the first indoor unit 3-1 is installed. The outdoor unit control device 28 controls the plurality of indoor heat exchangers 7-1 to 7- based on the room temperature measured by the first room temperature sensor 25-1 and the set temperature set in the first indoor unit 3-1. The heat load of the first indoor heat exchanger 7-1 provided in the first indoor unit 3-1 of the three indoor units is calculated. The outdoor unit control device 28 calculates a target outgoing temperature during independent operation based on the heat load of the indoor heat exchanger in independent operation, and so that the outgoing temperature becomes equal to the target outgoing temperature during independent operation. Calculate the target compressor rotation speed during independent operation. When operating multiple units, the outdoor unit control device 28 calculates a target outgoing temperature during multiple unit operation based on the heat load of the maximum load indoor heat exchanger, and the outgoing temperature becomes equal to the target outgoing temperature during multiple unit operation. The target compressor rotation speed when operating multiple units is calculated as follows. In the air-conditioning device of the first embodiment, the method of controlling the outgoing temperature is different between single operation and multiple unit operation, and whether the single operation or multiple unit operation is performed, the water-refrigerant heat exchanger 19 The compressor 15 can be controlled, the plurality of indoor units 3-1 to 3-3 can be prevented from excessively or insufficiently heating and cooling, and comfort can be improved.

By the way, the air conditioning system of the first embodiment described above calculates the second target flow rate using the flow rate adjustment valve target flow rate table 38, but the second target flow rate is calculated without using the flow rate adjustment valve target flow rate table 38. It may be calculated. In addition, although the air conditioning system of the first embodiment described above uses the pump target flow rate table 37 to calculate the target flow rate during individual operation, the target flow rate during individual operation is calculated without using the pump target flow rate table 37. It's okay.

In the air conditioning system of the second embodiment, the outdoor unit control device 28 of the air conditioning system of the first embodiment described above uses a mathematical formula to determine the second target flow rate without using the pump target flow rate table 37 and the flow rate adjustment valve target flow rate table 38. and the target flow rate during standalone operation are calculated, and the rest is the same as the air-conditioning system of the first embodiment described above. That is, the water side capacity Qw of each target indoor heat exchanger among the plurality of indoor heat exchangers 7-1 to 7-3 is generally determined by water specific heat Cpw, inlet water temperature TwL, outlet water temperature TwR, and water flow rate. It is expressed by the following equation (1) using Gw.
Qw=Cpw×(TwL−TwR)×Gw…(1)
Here, the inlet water temperature TwL indicates the temperature of water supplied to the target indoor heat exchanger. The outlet water temperature TwR indicates the temperature of water flowing out from the target indoor heat exchanger. The water flow rate Gw indicates the flow rate of water flowing into the target indoor heat exchanger per unit time. Furthermore, the air side capacity Qa of the target indoor heat exchanger is generally calculated by the following equation (2) using the air specific heat Cpa, the inlet water temperature TwL, the indoor suction temperature Ta, the heat exchanger temperature efficiency ε, and the air volume Ga. expressed.
Qa=Cpa×(TwL−Ta)×ε×Ga…(2)
Here, the indoor suction temperature Ta indicates the temperature inside the room in which the target indoor unit in which the target indoor heat exchanger is installed among the plurality of indoor units 3-1 to 3-3 is installed. The heat exchanger temperature efficiency ε indicates a value specific to the target indoor heat exchanger, and is a function of the water flow rate Gw. The air volume Ga indicates the air volume at which the target indoor unit blows air whose temperature has been adjusted by the target indoor heat exchanger indoors.

At this time, the outdoor unit control device 28 uses equations (1) and (2) so that the water side capacity Qw and the air side capacity Qa roughly match the heat load of the target indoor heat exchanger when multiple units are operated. is calculated backwards to calculate the water flow rate Gw as the second target flow rate. The outdoor unit control device 28 back-calculates equations (1) and (2) so that the water side capacity Qw and the air side capacity Qa generally match the heat load of the independently operated indoor heat exchanger during the isolated operation. Then, the water flow rate Gw is calculated as the target flow rate during independent operation.

In the air conditioning system of the second embodiment, even when the second target flow rate and the target flow rate during independent operation are calculated using mathematical formulas without using the pump target flow rate table 37 and the flow rate adjustment valve target flow rate table 38, the above-mentioned Similarly to the heating and cooling system of Embodiment 1, a plurality of flow rate regulating valves 6-1 to 6-3 and the pump 8 can be controlled. Therefore, the air-conditioning device of the second embodiment can improve comfort similarly to the air-conditioning device of the first embodiment described above. In addition, the air conditioning system of the first embodiment described above uses the pump target flow rate table 37 and the flow rate adjustment valve target flow rate table 38, so there is no need to back-calculate equations (1) and (2), and the air conditioning system of the second embodiment Compared to the air conditioning system, the second target flow rate and the target flow rate during independent operation can be calculated in a shorter time.

Incidentally, although the air-conditioning apparatus of the embodiment described above is provided with a plurality of water temperature sensors 26-1 to 26-3, the plurality of water temperature sensors 26-1 to 26-3 may be omitted. The water temperatures measured by the plurality of water temperature sensors 26-1 to 26-3 are approximately equal to the outgoing temperature measured by the outgoing temperature sensor 23. Therefore, when the plurality of water temperature sensors 26-1 to 26-3 are omitted, the air conditioning system uses the outgoing temperature sensor 23 instead of the water temperature measured by the plurality of water temperature sensors 26-1 to 26-3. The outgoing temperature measured by can be used. Moreover, although the air conditioning apparatus of the above-mentioned embodiment is provided with the outgoing temperature sensor 23, the outgoing temperature sensor 23 may be omitted. When the outgoing temperature sensor 23 is omitted, the air conditioning system uses the water temperature measured by one of the plurality of water temperature sensors 26-1 to 26-3 instead of the outgoing temperature measured by the outgoing temperature sensor 23. Can be used. Even in such a case, the heating and cooling device can improve comfort in the same way as the heating and cooling device of the previously described embodiments.

By the way, the water-refrigerant heat exchanger 19 of the air-conditioning device of the embodiment described above heats or cools the water circulating in the water circuit 4, but only heats the water circulating in the water circuit 4 without cooling it. It may be replaced with another heat source device. Even in such a case, the heating and cooling device can improve comfort in the same way as the heating and cooling device of the above-mentioned embodiments.

By the way, although water circulates in the water circuit 4 of the air-conditioning apparatus in the embodiment described above, a heat medium other than water may also circulate. An example of the heat medium is antifreeze. Even when a heat medium other than water is circulated through the water circuit 4, the air-conditioning device can improve comfort in the same way as the air-conditioning device of the embodiment described above.

By the way, the air conditioning system of the embodiment described above is provided with a plurality of indoor units 3-1 to 3-2 that blow air indoors, but the plurality of indoor units 3-1 to 3-2 are connected to other indoor units. It may be replaced by multiple terminals. An example of the terminal is a floor heating device that adjusts the temperature of the floor to heat the room. Even in such a case, the air-conditioning device can improve comfort similarly to the air-conditioning device of the first embodiment described above.

Although the embodiments have been described above, the embodiments are not limited to the contents described above. Furthermore, the above-mentioned components include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that are in a so-called equivalent range. Furthermore, the aforementioned components can be combined as appropriate. Furthermore, at least one of various omissions, substitutions, and modifications of the components can be made without departing from the gist of the embodiments.

1: Air conditioner 3-1 to 3-3: Multiple indoor units 4: Water circuit (heat medium circuit)
5: Water refrigerant heat exchanger (heat source machine)
6-1 to 6-3: Multiple flow rate adjustment valves 7-1 to 7-3: Multiple indoor heat exchangers 8: Pump 14: Refrigerant circuit 15: Compressor 19: Water-refrigerant heat exchanger (heat medium refrigerant heat exchanger) exchanger)
23: Outgoing temperature sensor 24: Return temperature sensor 25-1 to 25-3: Multiple room temperature sensors 26: Pump 26-1 to 26-3: Multiple water temperature sensors (multiple heat medium temperature detection units)
28: Outdoor unit control device (control unit)
37: Pump target flow rate table 38: Flow rate adjustment valve target flow rate table

Claims (4)

a pump that circulates the heat medium inside the heat medium circuit;
a plurality of indoor heat exchangers provided in the heat medium circuit and provided in parallel with each other;
a plurality of flow rate adjustment valves provided for each of the plurality of indoor heat exchangers;
a plurality of heat medium temperature detection units provided for each of the plurality of indoor heat exchangers;
a heat source device that adjusts the temperature of the heat medium;
controlling the pump so that a predetermined flow rate of the heat medium circulates through the heat medium circuit when the heat medium flows through the plurality of indoor heat exchangers; Among them, the indoor heat exchanger with the maximum heat load is set as the maximum heat load indoor heat exchanger, and the maximum heat load target flow rate is calculated based on the heat load of the maximum heat load indoor heat exchanger. controlling the flow rate adjustment valve corresponding to the maximum heat load indoor heat exchanger among the plurality of flow rate adjustment valves so that the flow rate of the heat medium flowing through the heat exchanger is equal to the maximum heat load target flow rate; Another indoor heat exchanger different from the maximum heat load indoor heat exchanger among the plurality of indoor heat exchangers is a residual heat load indoor heat exchanger, and the heat load of the residual heat load indoor heat exchanger and the maximum heat The residual heat load target flow rate calculated based on the temperature of the heat medium flowing into the maximum heat load indoor heat exchanger measured by the heat medium temperature detection section corresponding to the load indoor heat exchanger, A heating and cooling device comprising: a control unit that controls the flow rate adjustment valve corresponding to the residual heat load indoor heat exchanger among the plurality of flow rate adjustment valves so that the flow rate of the heat medium flowing through the heat exchanger becomes equal. The heat source device has a refrigerant circuit including a compressor and a heat medium refrigerant heat exchanger that exchanges heat between the heat medium and the refrigerant, and the refrigerant circulates;
The control unit includes:
When the indoor heat exchanger is in an isolated operation in which the heat medium flows only in one indoor heat exchanger among the plurality of indoor heat exchangers, the indoor heat exchanger is regarded as an independently operated indoor heat exchanger, and the heat in the individually operated indoor heat exchanger is The pump is controlled so that the flow rate of the heat medium flowing through the isolated indoor heat exchanger is equal to the target flow rate during isolated operation calculated based on the load, and the heat load in the isolated indoor heat exchanger is controlled. controlling the compressor so that the compressor rotation speed of the compressor becomes equal to the target compressor rotation speed during independent operation calculated based on the
When operating the plurality of units, the compressor is operated so that the number of rotations of the compressor becomes equal to the target number of rotations of the compressor during operation of the plurality of units, which is calculated based on the heat load of the maximum heat load indoor heat exchanger. The heating and cooling device according to claim 1. an outgoing temperature sensor that measures an outgoing temperature that is the temperature of the heat medium whose temperature has been adjusted by the heat source device;
Further comprising a return temperature sensor that measures a return temperature that is the temperature of the heat medium flowing out from the indoor heat exchanger,
a pump target flow rate table that associates a plurality of combinations of the outgoing temperature and a temperature difference between the outgoing temperature and the return temperature with a plurality of target flow rates during independent operation; and a capacity that is associated with the temperature of the heat medium; a storage unit that stores a flow rate adjustment valve target flow rate table including a plurality of flow rate combinations;
The control unit includes:
During the individual operation, by referring to the pump target flow rate table, a combination of the temperature difference between the outgoing temperature and the return temperature and the outgoing temperature among the plurality of individual operation target flow rates is determined. Calculate the target flow rate during independent operation,
When the plural units are operated, the residual heat load target flow rate corresponding to the combination of the heat load in the residual heat load indoor heat exchanger and the outgoing temperature is calculated with reference to the flow rate adjustment valve target flow rate table. 2. The air conditioning device according to 2. further comprising a plurality of indoor units each including the plurality of indoor heat exchangers,
The plurality of indoor units are:
comprising a room temperature sensor that measures the temperature of the room in which the indoor unit is installed,
The control unit includes:
Calculating the heat load of an indoor heat exchanger provided in the indoor unit of the plurality of indoor heat exchangers based on the room temperature measured by the room temperature sensor and the set temperature set in the indoor unit;
During the individual operation, a target outgoing temperature during the individual operation is calculated based on the heat load of the indoor heat exchanger in the individual operation, and the individual operation is performed so that the outgoing temperature becomes equal to the target outgoing temperature during the individual operation. Calculate the target compressor rotation speed,
When operating the plural units, calculate a target outgoing temperature when operating the plural units based on the heat load of the maximum heat load indoor heat exchanger, so that the outgoing temperature becomes equal to the target outgoing temperature when operating the plural units. , calculating the target compressor rotation speed when the plurality of units are operated.

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