Air conditioning system

Abstract

The air conditioning system (50) includes a ventilation unit (10a, 10b), an air conditioning unit (200a, 200c), and a controller (100). The ventilation unit supplies outdoor air to the room and exhausts indoor air to the outside. The ventilation unit has a first heat exchanger (21) for exchanging heat between outdoor air and indoor air, and a second heat exchanger (25) for exchanging heat between outdoor air and a heat medium. The air conditioning unit is capable of operating in multiple modes. The controller changes the operation of the ventilation unit according to the operating mode performed by the air conditioning unit.

Description

Technical Field

[0001] This disclosure relates to an air conditioning system. Background Technology

[0002] Air conditioning systems incorporating air conditioning units and ventilation units are known to date. For example, such an air conditioning system is disclosed in Patent Document 1. In Patent Document 1, the ventilation unit includes a heat exchanger that allows heat exchange between outdoor air supplied to the room and indoor air exhausted to the outside. Patent Document 1 also describes adjusting the air supply of the ventilation unit according to whether the air conditioning unit is in operation or off.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2012-172961 Summary of the Invention

[0006] -The technical problem the invention aims to solve-

[0007] Regarding the air conditioning system in Patent Document 1, the control of the ventilation device takes into account whether the air conditioning unit is in an operating state or a stopped state. Therefore, in existing air conditioning systems, it may be impossible to properly control the overall operation of the air conditioning system.

[0008] The purpose of this disclosure is to properly control an air conditioning system having air conditioning and ventilation devices.

[0009] - Technical solutions for solving technical problems -

[0010] The first aspect of this disclosure relates to an air conditioning system 50, which includes ventilation devices 10a and 10b, air conditioning units 200a and 200c, and a controller 100. The ventilation devices 10a and 10b have a first heat exchanger 21 for exchanging heat between outdoor air and indoor air, and a second heat exchanger 25 for exchanging heat between outdoor air that has passed through the first heat exchanger 21 and a heat medium. The ventilation devices 10a and 10b supply outdoor air to the room and exhaust indoor air to the outside. The air conditioning units 200a and 200c have a third heat exchanger 225 for exchanging heat between indoor air and a heat medium. The air conditioning units 200a and 200c are capable of performing multiple operating modes. The controller 100 changes the operation of the ventilation devices 10a and 10b according to the operating mode performed by the air conditioning units 200a and 200c.

[0011] In the first aspect, ventilation devices 10a and 10b supply outdoor air, which has passed sequentially through the first heat exchanger 21 and the second heat exchanger 25, to the indoor environment. The controller 100 modifies the operation of ventilation devices 10a and 10b according to the operating mode performed by air conditioning units 200a and 200c. Therefore, ventilation devices 10a and 10b can be made to operate in an appropriate state corresponding to the operating mode performed by air conditioning units 200a and 200c, thereby enabling appropriate control of the air conditioning system 50.

[0012] The second aspect of this disclosure, based on the first aspect described above, involves the controller 100 changing the heat exchange capacity of the second heat exchanger 25 of the ventilation devices 10a and 10b according to the operating mode performed by the air conditioning devices 200a and 200c.

[0013] In the second aspect, the state of the outdoor air supplied to the room by the ventilation devices 10a and 10b changes according to the operating mode performed by the air conditioning devices 200a and 200c through the control action of the controller 100.

[0014] The third aspect of this disclosure, based on the second aspect described above, includes an indoor air heating mode in which the air conditioning units 200a and 200c can heat indoor air in the third heat exchanger 225, and an outdoor air heating mode in which the ventilation units 10a and 10b can heat outdoor air in the second heat exchanger 25. When the air conditioning units 200a and 200c start the indoor air heating mode while the ventilation units 10a and 10b are performing the outdoor air heating mode, the controller 100 reduces the heating amount of the second heat exchanger 25 of the ventilation units 10a and 10b, or stops the second heat exchanger 25 from heating the outdoor air.

[0015] In the third aspect, when the air conditioning units 200a and 200c start the indoor air heating mode while the ventilation units 10a and 10b are in outdoor air heating mode, the controller 100 changes the amount of outdoor air heated by the second heat exchanger 25 of the ventilation units 10a and 10b. Therefore, compared to the case where the controller 100 does not change the amount of outdoor air heated by the second heat exchanger 25 of the ventilation units 10a and 10b, the proportion of the heating load in the indoor space handled by the third heat exchanger 225 of the air conditioning units 200a and 200c increases, while the proportion of the load handled by the second heat exchanger 25 of the ventilation units 10a and 10b decreases.

[0016] The fourth aspect of this disclosure, based on the second aspect described above, includes an indoor air cooling mode in which the air conditioning units 200a and 200c can perform operations including cooling indoor air in the third heat exchanger 225. When the air conditioning units 200a and 200c start the indoor air cooling mode while the second heat exchanger 25 of the ventilation units 10a and 10b is stopped cooling outdoor air, the controller 100 causes the second heat exchanger 25 to start cooling outdoor air.

[0017] In the fourth aspect, when the second heat exchangers 25 of the ventilation units 10a and 10b stop cooling the outdoor air, and the air conditioning units 200a and 200c start the indoor air cooling mode, the controller 100 causes the second heat exchangers 25 to start cooling the outdoor air. Therefore, compared to the case where the second heat exchangers 25 of the ventilation units 10a and 10b remain stopped cooling the outdoor air, the proportion of the cooling load in the indoor space 5 handled by the third heat exchangers 225 of the air conditioning units 200a and 200c decreases, while the proportion of the load handled by the second heat exchangers 25 of the ventilation units 10a and 10b increases.

[0018] The fifth aspect of this disclosure, based on the first aspect described above, includes an indoor air cooling mode in which the air conditioning units 200a and 200c can perform cooling of indoor air in the third heat exchanger 225, and an outdoor air cooling mode in which the ventilation units 10a and 10b can perform cooling of outdoor air in the second heat exchanger 25. When the air conditioning units 200a and 200c are performing the indoor air cooling mode and the ventilation units 10a and 10b are performing the outdoor air cooling mode, the temperature of the third heat exchanger 225 is higher than the temperature of the second heat exchanger 25.

[0019] In the fifth aspect, when the air conditioning units 200a and 200c are in indoor air cooling mode and the ventilation units 10a and 10b are in outdoor air cooling mode, the cooling load of the indoor space is relatively small, while the load is relatively large, handled by the third heat exchanger 225 of the air conditioning units 200a and 200c.

[0020] The sixth aspect of this disclosure, based on any one of the first to fifth aspects above, is that the volume of the third heat exchanger 225 of the air conditioning devices 200a and 200c is greater than the volume of the second heat exchanger 25 of the ventilation devices 10a and 10b.

[0021] Generally speaking, the larger the volume of a heat exchanger, the higher its heat exchange capacity. Therefore, in the sixth aspect, the heat exchange capacity of the third heat exchanger 225 of the air conditioning units 200a and 200c is greater than the heat exchange capacity of the second heat exchanger 25 of the ventilation units 10a and 10b.

[0022] Based on any of the first to sixth aspects described above, the seventh aspect of this disclosure allows the controller 100 to enable the air conditioning devices 200a and 200c to continue operating even when the ventilation devices 10a and 10b are stopped during operation.

[0023] In the seventh aspect, even after the air conditioning units 200a and 200c stop operating while the ventilation units 10a and 10b are working, the controller 100 will still cause the ventilation units 10a and 10b to continue operating. Therefore, regardless of the status of the air conditioning units 200a and 200c, continuous ventilation of the indoor space is possible.

[0024] The eighth aspect of this disclosure, based on the seventh aspect above, involves, after the air conditioning units 200a and 200c stop, the controller 100 causing the ventilation units 10a and 10b to perform the same actions performed by the ventilation units 10a and 10b before the air conditioning units 200a and 200c are started.

[0025] In the eighth aspect, when the air conditioning units 200a and 200c stop, the controller 100 causes the operation performed by the ventilation units 10a and 10b to return to the operation performed by the ventilation units 10a and 10b before the air conditioning units 200a and 200c started.

[0026] Based on any one of the first to eighth aspects described above, the ninth aspect of this disclosure includes a ventilation device 10a, 10b comprising a sensor 105 that measures the temperature and humidity of outdoor air flowing from the first heat exchanger 21 to the second heat exchanger 25, and a controller 100 that adjusts the heat exchange rate of the second heat exchanger 25 based on the measurements taken by the sensor 105.

[0027] In the ninth aspect, the heat exchange capacity of the second heat exchanger 25 is changed according to the temperature and humidity of the outdoor air flowing to the second heat exchanger 25 after passing through the first heat exchanger 21. Attached Figure Description

[0028] Figure 1 This is a simplified structural diagram of a residential building equipped with an air conditioning system.

[0029] Figure 2 This is a piping system diagram showing the structure of the refrigerant circuit of an air conditioning unit.

[0030] Figure 3 This is a piping system diagram showing the structure of the refrigerant circuit of the ventilation unit.

[0031] Figure 4 This is a cross-sectional view showing the simplified structure of the ventilation unit of the ventilation device.

[0032] Figure 5 This is a block diagram showing the structure of the ventilation controller of the ventilation device and the air conditioning controller of the air conditioning device.

[0033] Figure 6 This is a diagram showing the actions performed by the ventilation controller of the ventilation device. (A) represents the first automatic selection action, and (B) represents the second automatic selection action.

[0034] Figure 7 It is a timing diagram showing how the operation of the ventilation device changes as the heating mode of the air conditioning unit starts and ends.

[0035] Figure 8 It is a timing diagram showing how the operation of the ventilation device changes as the air conditioning unit's cooling or dehumidification mode begins and ends.

[0036] Figure 9 This is a simplified three-dimensional diagram of a typical finned tube air heat exchanger.

[0037] Figure 10 This is a simplified side view of a typical finned tube air heat exchanger.

[0038] Figure 11 This is a timing diagram showing the changes in the operation of the ventilation device in a variation of the embodiment 1 as the heating mode of the air conditioning unit begins and ends. Detailed Implementation

[0039] The air conditioning system 50 of the implementation method will be described.

[0040] -Air conditioning systems and residential buildings-

[0041] like Figure 1 As shown, the air conditioning system 50 of this embodiment is installed in the residence 1. The air conditioning system 50 includes four air conditioning units 200a to 200d and two ventilation units 10a and 10b. It should be noted that the number of air conditioning units 200a to 200d and the number of ventilation units 10a and 10b are only one example.

[0042] In a residential building 1 equipped with an air conditioning system 50, living rooms 2a-2d and single rooms, as well as non-living rooms 3a and 3b such as corridors and bathrooms are formed on the first and second floors, respectively. These living rooms 2a-2d and non-living rooms 3a and 3b constitute the interior space 5. In addition, in the residential building, a ceiling back space 8 is formed above the ceiling panels 7 on both the first and second floors.

[0043] - Structure of the air conditioning unit -

[0044] like Figure 2 As shown, each air conditioning unit 200a-200d includes one outdoor unit 211a-211d and one indoor unit 212a-212d. The first air conditioning unit 200a includes a first outdoor unit 211a and a first indoor unit 212a. The second air conditioning unit 200b includes a second outdoor unit 211b and a second indoor unit 212b. The third air conditioning unit 200c includes a third outdoor unit 211c and a third indoor unit 212c. The fourth air conditioning unit 200d includes a fourth outdoor unit 211d and a fourth indoor unit 212d.

[0045] like Figure 1 As shown, the indoor units 212a-212d of each air conditioning unit 200a-200d are respectively installed in different rooms 2a-2d. Specifically, the first indoor unit 212a is installed in the first room 2a, the second indoor unit 212b is installed in the second room 2b, the third indoor unit 212c is installed in the third room 2c, and the fourth indoor unit 212d is installed in the fourth room 2d. In this embodiment, each indoor unit 212a-212d is a wall-mounted indoor unit.

[0046] The outdoor units 211a to 211d of each air conditioning unit 200a to 200d are installed in the outdoor space 6. Figure 1 The illustrations of outdoor units 211a to 211d are omitted in the text.

[0047] <Outdoor unit>

[0048] like Figure 2 As shown, each outdoor unit 211a to 211d includes a compressor 221, a switching mechanism 222, an outdoor heat exchanger 223, and an expansion valve 224. Additionally, each outdoor unit 211a to 211d includes an outdoor fan 215 and an air conditioning controller 250.

[0049] The outdoor heat exchanger 223 is a finned tube air heat exchanger. The outdoor heat exchanger 223 allows the refrigerant, acting as the heat medium, to exchange heat with the outdoor air. The switching mechanism 222 is a four-way reversing valve including four valve ports. The switching mechanism 222 is in a first state where the first valve port is connected to the third valve port and the second valve port is connected to the fourth valve port. Figure 2The state shown by the solid line), and the second state where the first valve port is connected to the fourth valve port and the second valve port is connected to the third valve port. Figure 2 Switch between states indicated by the dashed line.

[0050] <Indoor unit>

[0051] Each indoor unit 212a to 212d includes an indoor heat exchanger 225 and an indoor fan 216. In addition, each indoor unit 212a to 212d includes an indoor temperature sensor 255 and a heat exchanger temperature sensor 256.

[0052] Indoor heat exchanger 225 is a third heat exchanger that allows refrigerant, acting as a heat medium, to exchange heat with indoor air. Indoor heat exchanger 225 is a finned-tube air heat exchanger. Indoor temperature sensor 255 measures the temperature of the indoor air before it passes through indoor heat exchanger 225. Heat exchanger temperature sensor 256 is installed on the heat transfer tubes constituting indoor heat exchanger 225 and measures the evaporation and condensation temperatures of the refrigerant within indoor heat exchanger 225.

[0053] <Refrigerant Circuit>

[0054] In each air conditioning unit 200a to 200d, the outdoor units 211a to 211d and the indoor units 212a to 212d are connected via a liquid-side connecting pipe 226 and a gas-side connecting pipe 227. In each air conditioning unit 200a to 200d, the outdoor units 211a to 211d, the indoor units 212a to 212d, the liquid-side connecting pipe 226, and the gas-side connecting pipe 227 form a refrigerant circuit 220.

[0055] In the refrigerant circuit 220, the discharge pipe of compressor 221 is connected to the first valve port of switching mechanism 222, and the suction pipe of compressor 221 is connected to the second valve port of switching mechanism 222. The third valve port of switching mechanism 222 is connected to the gas-side end of outdoor heat exchanger 223. The fourth valve port of switching mechanism 222 is connected to the gas-side end of indoor heat exchanger 225 via gas-side connecting pipe 227. The liquid-side end of outdoor heat exchanger 223 is connected to one end of expansion valve 224. The other end of expansion valve 224 is connected to the liquid-side end of indoor heat exchanger 225 via liquid-side connecting pipe 226.

[0056] <Air Conditioner Controller>

[0057] Each air conditioning unit 200a to 200d includes an air conditioning controller 250. In each air conditioning unit 200a to 200d, the air conditioning controller 250 is housed in an outdoor unit 211a to 211d.

[0058] like Figure 5As shown, the air conditioning controller 250 includes a microcomputer 250a and a storage device 250b. The microcomputer 250a is mounted on a control board, and the storage device 250b stores software for operating the microcomputer 250a. The storage device 250b is a semiconductor memory. Measurements from the indoor temperature sensor 255 and the heat exchanger temperature sensor 256 are input to the air conditioning controller 250.

[0059] The air conditioning controller 250 controls the components of the air conditioning units 200a to 200d. For example, the air conditioning controller 250 controls the operating frequency of the compressor 221 to maintain the measured value of the indoor temperature sensor 255 at the set temperature. In addition, the air conditioning controller 250 operates the switching mechanism 222 according to the operating mode specified by the user.

[0060] - Operation of the air conditioning unit -

[0061] Each air conditioning unit 200a to 200d can perform multiple operating modes. Specifically, each air conditioning unit 200a to 200d can perform cooling mode, dehumidification mode, heating mode, and air supply mode.

[0062] <Cooling mode, Dehumidification mode>

[0063] The cooling mode and dehumidification mode are indoor air cooling modes that cool indoor air in the indoor heat exchanger 225.

[0064] In cooling and dehumidification modes, the switching mechanism 222 is in its first state, the compressor 221 operates, and the refrigerant circulates in the refrigerant circuit 220. Additionally, the outdoor fan 215 and the indoor fan 216 operate. A cooling cycle occurs in the refrigerant circuit 220, with the outdoor heat exchanger 223 functioning as a condenser and the indoor heat exchanger 225 functioning as an evaporator.

[0065] In the indoor heat exchanger 225, which functions as an evaporator, the indoor air is cooled, and its temperature decreases. Additionally, moisture contained in the indoor air condenses in the indoor heat exchanger 225, causing a decrease in the absolute humidity of the indoor air. Each indoor unit 212a to 212d blows the cooled indoor air from the indoor heat exchanger 225 into its corresponding room 2a to 2d.

[0066] <Heating Mode>

[0067] The heating mode is an indoor air heating mode in which indoor air is heated in the indoor heat exchanger 225.

[0068] In heating mode, switching mechanism 222 enters the second state, compressor 221 operates, and refrigerant circulates in refrigerant circuit 220. Additionally, outdoor fan 215 and indoor fan 216 operate. A refrigeration cycle occurs in refrigerant circuit 220, with indoor heat exchanger 225 functioning as a condenser and outdoor heat exchanger 223 functioning as an evaporator.

[0069] In the indoor heat exchanger 225, which functions as a condenser, the indoor air is heated, and the temperature of the indoor air rises. Each indoor unit 212a to 212d blows the heated indoor air from the indoor heat exchanger 225 into the corresponding rooms 2a to 2d.

[0070] <Airflow Mode>

[0071] The air supply mode is the operating mode in which indoor units 212a to 212d only supply air to rooms 2a to 2d.

[0072] In air supply mode, compressor 221 and outdoor fan 215 stop, while indoor fan 216 operates. In air supply mode, indoor heat exchanger 225 stops cooling and heating the indoor air. Indoor units 212a-212d return the drawn-in indoor air to rooms 2a-2d as is.

[0073] -Structure of the ventilation system-

[0074] like Figure 3 As shown, each ventilation device 10a, 10b includes a ventilation unit 11a, 11b and a heat source unit 80a, 80b. The first ventilation device 10a includes a first ventilation unit 11a and a first heat source unit 80a. The second ventilation device 10b includes a second ventilation unit 11b and a second heat source unit 80b.

[0075] like Figure 1 As shown, the first ventilation unit 11a is installed in the space 8 behind the ceiling on the first floor of the residence 1, and the second ventilation unit 11b is installed in the space 8 behind the ceiling on the second floor of the residence 1. Figure 1 The illustrations of heat source units 80a and 80b are omitted in the text.

[0076] Each ventilation unit 11a, 11b is connected to an outdoor air duct D1, an exhaust duct D2, and an air supply duct D3. The inlet end of the outdoor air duct D1 is open to the outdoor space 6, and the outlet end of the outdoor air duct D1 is connected to the corresponding ventilation unit 11a, 11b. The inlet end of the exhaust duct D2 is connected to the corresponding ventilation unit 11a, 11b, and the outlet end of the exhaust duct D2 is open to the outdoor space 6. The inlet end of the air supply duct D3 is connected to the corresponding ventilation unit 11a, 11b.

[0077] Four gas supply units 30a to 30d are installed on the ceiling panel 7 of residential building 1. It should be noted that the number of gas supply units 30a to 30d shown here is only one example.

[0078] The first air supply unit 30a and the second air supply unit 30b are connected to the first ventilation unit 11a via air supply pipe D3. The first air supply unit 30a blows air supplied from the first ventilation unit 11a into the first room 2a. The second air supply unit 30b blows air supplied from the first ventilation unit 11a into the second room 2b.

[0079] The third air supply unit 30c and the fourth air supply unit 30d are connected to the second ventilation unit 11b via air supply pipe D3. The third air supply unit 30c blows air supplied from the second ventilation unit 11b into the third room 2c. The fourth air supply unit 30d blows air supplied from the second ventilation unit 11b into the fourth room 2d.

[0080] <Heat Source Unit>

[0081] like Figure 3 As shown, each heat source unit 80a and 80b includes a compressor 82, a switching mechanism 84, a heat source-side heat exchanger 83, and an expansion valve 85. Additionally, each heat source unit 80a and 80b includes a heat source-side fan 81 and an air exchange controller 100.

[0082] The heat source-side heat exchanger 83 is a finned tube air heat exchanger. The heat source-side heat exchanger 83 allows the refrigerant, acting as the heat medium, to exchange heat with the outdoor air. The switching mechanism 84 is a four-way reversing valve including four valve ports. The switching mechanism 84 is in a first state where the first valve port is connected to the third valve port and the second valve port is connected to the fourth valve port. Figure 3 The state shown by the solid line), and the second state where the first valve port is connected to the fourth valve port and the second valve port is connected to the third valve port. Figure 3 Switch between states indicated by the dashed line.

[0083] <Ventilation Unit>

[0084] Each ventilation unit 11a, 11b includes a total heat exchanger 21 and a utilization-side heat exchanger 25, and ventilates the indoor space 5. Additionally, each ventilation unit 11a, 11b includes a temperature and humidity sensor 105 and a heat exchanger temperature sensor 106. The detailed structure of each ventilation unit 11a, 11b will be described later.

[0085] <Refrigerant Circuit>

[0086] In each ventilation unit 10a, 10b, the heat source units 80a, 80b and the ventilation units 11a, 11b are connected via a liquid-side connecting pipe 87 and a gas-side connecting pipe 86. In each ventilation unit 10a, 10b, the heat source units 80a, 80b, the ventilation units 11a, 11b, the liquid-side connecting pipe 87, and the gas-side connecting pipe 86 form a refrigerant circuit R.

[0087] In the refrigerant circuit R, the discharge pipe of compressor 82 is connected to the first valve port of switching mechanism 84, and the suction pipe of compressor 82 is connected to the second valve port of switching mechanism 84. The third valve port of switching mechanism 84 is connected to the gas side of heat exchanger 83 on the heat source side. The fourth valve port of switching mechanism 84 is connected to the gas side of heat exchanger 25 on the utilization side via gas side connecting pipe 86. The liquid side of heat exchanger 83 on the heat source side is connected to one end of expansion valve 85. The other end of expansion valve 85 is connected to the liquid side of heat exchanger 25 on the utilization side via liquid side connecting pipe 87.

[0088] <Ventilation Controller>

[0089] Each ventilation device 10a, 10b includes a ventilation controller 100. In each ventilation device 10a, 10b, the ventilation controller 100 is housed within the heat source units 80a, 80b. It should be noted that the ventilation controller 100 can also be housed within the ventilation units 11a, 11b.

[0090] like Figure 5 As shown, the ventilation controller 100 includes a microcomputer 100a and a storage device 100b. The microcomputer 100a is mounted on a control board, and the storage device 100b stores software for operating the microcomputer 100a. The storage device 100b is a semiconductor memory. Measurement values ​​from the temperature and humidity sensor 105 and the heat exchanger temperature sensor 106 are input to the ventilation controller 100.

[0091] The ventilation controller 100 controls the components of the ventilation devices 10a and 10b. For example, the ventilation controller 100 controls the operation of the compressor 82 based on the measurements from the temperature and humidity sensor 105. Furthermore, the ventilation controller 100 can perform a first automatic control action and a second automatic control action. Detailed operation of the ventilation controller 100 will be described later.

[0092] The ventilation controllers 100 of each ventilation unit 10a and 10b are capable of communicating with the air conditioning controllers 250 of their respective air conditioning units 200a to 200d. The ventilation controllers 100 of each ventilation unit 10a and 10b receive operating information related to the operating status of their respective air conditioning units 200a to 200d from the air conditioning controllers 250. The ventilation controllers 100 are controllers that change the operation of the ventilation units 10a and 10b based on the received operating information.

[0093] -Structure of the ventilation unit-

[0094] like Figure 4 As shown, each ventilation unit 11a, 11b has a housing 12. An air supply passage 13 and an exhaust passage 14 are formed in the housing 12 of each ventilation unit 11a, 11b. In addition, an air supply fan 22, an exhaust fan 23, a total heat exchanger 21, and a utilization side heat exchanger 25 are housed in the housing 12 of each ventilation unit 11a, 11b.

[0095] <Shell>

[0096] like Figure 4 As shown, the shell 12 is formed in a cuboid shape. The shell 12 has an upper plate 12a, a lower plate 12b, and four side plates. The four side plates include a first side plate 12c and a second side plate 12d that are opposite each other.

[0097] The upper plate 12a forms the upper surface of the housing 12. The lower plate 12b forms the lower surface of the housing 12. The first side plate 12c forms the side surface of one end of the housing 12 along its long side. The second side plate 12d forms the side surface of the other end of the housing 12 along its long side.

[0098] A first pipe connection C1 and a second pipe connection C2 are provided on the first side plate 12c. Both the first pipe connection C1 and the second pipe connection C2 are cylindrical. The first pipe connection C1 and the second pipe connection C2 protrude laterally from the outer surface of the first side plate 12c. An outlet end of an outdoor air duct D1 is connected to the first pipe connection C1. An inlet end of an exhaust duct D2 is connected to the second pipe connection C2.

[0099] A third pipe connection C3 is provided on the second side plate 12d. The third pipe connection C3 is cylindrical. The third pipe connection C3 protrudes to the side from the outer surface of the second side plate 12d. The inlet end of the gas supply pipe D3 is connected to the third pipe connection C3.

[0100] An interior panel 15 is provided on the lower plate 12b of the housing 12. For example... Figure 1As shown, the indoor panel 15 is disposed inside the ventilation opening 7a that penetrates the ceiling panel 7. The indoor panel 15 faces the interior space 5. An intake port 15a is formed on the indoor panel 15. The intake port 15a formed on the housing 12 of the first ventilation unit 11a connects the inflow end of the exhaust passage 14 to the non-living room 3a on the first floor. The intake port 15a formed on the housing 12 of the second ventilation unit 11b connects the inflow end of the exhaust passage 14 to the non-living room 3b on the second floor.

[0101] <Partition>

[0102] like Figure 4 As shown, a first partition 16 and a second partition 17 are provided inside the housing 12. The first partition 16 divides the space between the first side plate 12c, the upper plate 12a, the lower plate 12b, and the total heat exchanger 21 into a first flow path P1 and a second flow path P2. The first flow path P1 is connected to the first pipe connection C1. The first flow path P1 constitutes the flow path upstream of the total heat exchanger 21 in the air supply path 13. The second flow path P2 is connected to the second pipe connection C2. The second flow path P2 constitutes the flow path downstream of the total heat exchanger 21 in the exhaust path 14.

[0103] The second partition 17 divides the space between the second side plate 12d, the upper plate 12a, the lower plate 12b, and the total heat exchanger 21 into a third flow path P3 and a fourth flow path P4. The third flow path P3 is connected to the third pipe connection C3. The third flow path P3 constitutes the flow path downstream of the total heat exchanger 21 in the air supply path 13. The fourth flow path P4 is connected to the intake port 15a of the indoor panel 15. The fourth flow path P4 constitutes the flow path upstream of the total heat exchanger 21 in the exhaust path 14.

[0104] <Total Heat Exchanger>

[0105] The total heat exchanger 21 is the first heat exchanger that allows outdoor air supplied to the room to exchange heat with indoor air exhausted to the outside.

[0106] The total heat exchanger 21 is a cross-flow heat exchanger. The total heat exchanger 21 allows air flowing in the supply passage 13 to exchange heat with air flowing in the exhaust passage 14. Inside the total heat exchanger 21, a supply-side internal flow path 21a and an exhaust-side internal flow path 21b are formed. The supply-side internal flow path 21a and the exhaust-side internal flow path 21b extend in mutually orthogonal directions.

[0107] The inflow portion of the gas supply side internal flow path 21a is connected to the first flow path P1. The outflow portion of the gas supply side internal flow path 21a is connected to the third flow path P3. The inflow portion of the exhaust side internal flow path 21b is connected to the fourth flow path P4. The outflow portion of the exhaust side internal flow path 21b is connected to the second flow path P2.

[0108] The total heat exchanger 21 facilitates the movement of heat between the air in the supply-side internal flow path 21a and the air in the exhaust-side internal flow path 21b. The total heat exchanger 21 also facilitates the movement of moisture between the air in the supply-side internal flow path 21a and the air in the exhaust-side internal flow path 21b. In this way, the total heat exchanger 21 exchanges both sensible heat and latent heat between the air in the supply-side internal flow path 21a and the exhaust-side internal flow path 21b.

[0109] <Supply and exhaust fans>

[0110] Air supply fan 22 is arranged in the third flow path P3. Exhaust fan 23 is arranged in the second flow path P2. Air supply fan 22 delivers air from air supply path 13. Exhaust fan 23 delivers air from exhaust path 14. Air supply fan 22 and exhaust fan 23 are Sylphyll-type fans. Air supply fan 22 and exhaust fan 23 can also be turbine-type or propeller-type fans.

[0111] <Filter>

[0112] Air exchange units 11a and 11b have filters 24. Filters 24 are arranged in the first flow path P1. In other words, filters 24 are arranged in the portion of the air supply path 13 upstream of the total heat exchanger 21. Filters 24 capture dust in the outdoor air OA.

[0113] <Utilizing a side heat exchanger>

[0114] The side heat exchanger 25 is a second heat exchanger that allows outdoor air after passing through the total heat exchanger 21 to exchange heat with the refrigerant, which serves as the heat medium. The side heat exchanger 25 is a finned tube type air heat exchanger.

[0115] A side heat exchanger 25 is arranged in the third flow path P3. The side heat exchanger 25 is arranged in the portion of the air supply path 13 downstream of the total heat exchanger 21. The side heat exchanger 25 is arranged in the third flow path P3 between the internal flow path 21a on the air supply side and the air supply fan 22.

[0116] <Sensors>

[0117] As described above, each ventilation unit 11a, 11b is equipped with a temperature and humidity sensor 105 and a heat exchanger temperature sensor 106.

[0118] like Figure 4As shown, the temperature and humidity sensor 105 is located in the third flow path P3, between the total heat exchanger 21 and the utilization-side heat exchanger 25. The temperature and humidity sensor 105 measures the temperature and relative humidity of the air (outdoor air) flowing from the total heat exchanger 21 to the utilization-side heat exchanger 25. It should be noted that in each ventilation unit 11a, 11b, a temperature sensor that only measures the air temperature and a humidity sensor that only measures the air relative humidity can be used instead of the temperature and humidity sensor 105.

[0119] A heat exchanger temperature sensor 106 is installed on the heat transfer tube constituting the utilization side heat exchanger 25 to measure the evaporation temperature and condensation temperature of the refrigerant in the utilization side heat exchanger 25.

[0120] -Operation of the ventilation system-

[0121] Each ventilation device 10a and 10b can perform multiple operating modes. Specifically, each ventilation device 10a and 10b can perform a cooling ventilation mode, a heating ventilation mode, and a simple ventilation mode.

[0122] <Cooling and ventilation mode>

[0123] The cooling and ventilation mode is an outdoor air cooling mode that utilizes the side heat exchanger 25 to cool the outdoor air.

[0124] In cooling and ventilation mode, switching mechanism 84 is in its first state, compressor 82 operates, and refrigerant circulates in refrigerant circuit R. In cooling and ventilation mode, compressor 82 operates at a constant speed. A refrigeration cycle occurs in refrigerant circuit R, with heat source-side heat exchanger 83 functioning as a condenser and utilization-side heat exchanger 25 functioning as an evaporator. Additionally, in cooling and ventilation mode, supply fan 22 and exhaust fan 23 operate.

[0125] In ventilation units 11a and 11b, outdoor air flows into the first flow path P1 through outdoor air duct D1, and indoor air flows into the fourth flow path P4 through intake 15a.

[0126] In the total heat exchanger 21, outdoor air flowing in from the first flow path P1 exchanges heat with indoor air flowing in from the fourth flow path P4. In summer, when the indoor space 5 is air-conditioned, the indoor air temperature and humidity are typically lower than the outdoor air temperature and humidity, respectively. Therefore, in the total heat exchanger 21, both heat and moisture (sensible heat and latent heat) move from the outdoor air to the indoor air.

[0127] Outdoor air that has passed through the total heat exchanger 21 is sent to the utilization side heat exchanger 25. On the other hand, indoor air that has passed through the total heat exchanger 21 is discharged to the exhaust pipe D2 through the second flow path P2.

[0128] In the utilization-side heat exchanger 25, which functions as an evaporator, the outdoor air that has passed through the total heat exchanger 21 is cooled, and the temperature of the outdoor air decreases. Additionally, moisture contained in the outdoor air condenses in the utilization-side heat exchanger 25, and the absolute humidity of the outdoor air decreases. The ventilation units 11a and 11b supply the cooled outdoor air from the utilization-side heat exchanger 25 to the rooms 2a to 2d via the air supply pipe D3.

[0129] <Heating and ventilation mode>

[0130] The heating and ventilation mode is an outdoor air heating mode that uses the side heat exchanger 25 to heat the outdoor air.

[0131] In the heating and ventilation mode, the switching mechanism 84 enters the second state, the compressor 82 operates, and the refrigerant circulates in the refrigerant circuit R. In this mode, the compressor 82 operates at a constant speed. A refrigeration cycle occurs in the refrigerant circuit R, utilizing the side heat exchanger 25 as a condenser and the heat source side heat exchanger 83 as an evaporator. Additionally, in the heating and ventilation mode, the supply fan 22 and the exhaust fan 23 operate.

[0132] In ventilation units 11a and 11b, outdoor air flows into the first flow path P1 through outdoor air duct D1, and indoor air flows into the fourth flow path P4 through intake 15a.

[0133] In the total heat exchanger 21, outdoor air flowing in from the first flow path P1 exchanges heat with indoor air flowing in from the fourth flow path P4. When the indoor space 5 is conditioned in winter, the temperature and humidity of the indoor air are typically higher than those of the outdoor air. Therefore, in the total heat exchanger 21, both heat and moisture (sensible heat and latent heat) move from the indoor air to the outdoor air.

[0134] Outdoor air that has passed through the total heat exchanger 21 is sent to the utilization side heat exchanger 25. On the other hand, indoor air that has passed through the total heat exchanger 21 is discharged to the exhaust pipe D2 through the second flow path P2.

[0135] In the utilization-side heat exchanger 25, which functions as a condenser, the outdoor air that has passed through the total heat exchanger 21 is heated, and the temperature of the outdoor air rises. The ventilation units 11a and 11b supply the outdoor air heated in the utilization-side heat exchanger 25 to the rooms 2a to 2d via the air supply pipe D3.

[0136] <Simple ventilation mode>

[0137] The simple ventilation mode is a mode in which ventilation is performed when the side heat exchanger 25 stops cooling and heating the outdoor air.

[0138] In simple ventilation mode, compressor 82 stops, while supply fan 22 and exhaust fan 23 operate. No refrigeration cycle occurs in the refrigerant circuit R.

[0139] In ventilation units 11a and 11b, outdoor air flows into the first flow path P1 through outdoor air duct D1, and indoor air flows into the fourth flow path P4 through intake duct 15a. In the total heat exchanger 21, the outdoor air flowing in from the first flow path P1 and the indoor air flowing in from the fourth flow path P4 exchange heat. The outdoor air that has passed through the total heat exchanger 21 is then supplied to rooms 2a to 2d via air supply duct D3 after passing through the utilization side heat exchanger 25. On the other hand, the indoor air that has passed through the total heat exchanger 21 is discharged to the exhaust duct D2 through the second flow path P2.

[0140] - Operation of the ventilation controller -

[0141] As described above, the ventilation controller 100 is capable of performing a first automatic selection action and a second automatic selection action. The first automatic selection action and the second automatic selection action are control actions that automatically select the operating mode of the ventilation devices 10a and 10b based on the measurement values ​​of the temperature and humidity sensor 105.

[0142] The ventilation controller 100 executes the action specified by the user in the first automatic selection action and the second automatic selection action. In addition, as described later, the ventilation controller 100 switches between the first automatic selection action and the second automatic selection action based on the operating information received from the air conditioning controller 250 of the corresponding air conditioning units 200a and 200c.

[0143] <First Automatic Selection Action>

[0144] Reference Figure 6 (A) The first automatic selection action of the ventilation controller 100 is described.

[0145] The ventilation controller 100 acquires the measured values ​​of temperature T and relative humidity H from the temperature and humidity sensor 105. Temperature T and relative humidity H are the temperature and relative humidity of the outdoor air flowing from the total heat exchanger 21 to the utilization side heat exchanger 25, respectively. The ventilation controller 100 calculates the absolute humidity X based on the acquired temperature T and relative humidity H.

[0146] In the first automatic selection action, the ventilation controller 100 compares the temperature T with the first upper reference temperature T_U1 and the first lower reference temperature T_L1, and compares the absolute humidity X with the first reference absolute humidity X1.

[0147] In this embodiment, the first upper reference temperature T_U1 is 26°C, and the first lower reference temperature T_L1 is 18°C. Furthermore, the first reference absolute humidity X1 is the absolute humidity of moist air at the first upper reference temperature T_U1 and the first reference relative humidity H1. The first reference relative humidity H1 is 55%. It should be noted that these specific values ​​are merely examples.

[0148] When the temperature T is higher than the first upper reference temperature T_U1, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a cooling ventilation mode. When the temperature T is higher than the first lower reference temperature T_L1 and lower than the first upper reference temperature T_U1, and the absolute humidity X is higher than the first reference absolute humidity X1, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a cooling ventilation mode. When the temperature T is higher than the first lower reference temperature T_L1 and lower than the first upper reference temperature T_U1, and the absolute humidity X is lower than the first reference absolute humidity X1, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a simple ventilation mode. When the temperature T is lower than the first lower reference temperature T_L1, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a heating ventilation mode.

[0149] <Second Automatic Selection Action>

[0150] Reference Figure 6 (B) The second automatic selection action of the ventilation controller 100 will be explained.

[0151] In the second automatic selection action, similar to the first automatic selection action, the ventilation controller 100 acquires the measured values ​​of the temperature and humidity sensor 105, namely temperature T and relative humidity H, and calculates the absolute humidity X based on the acquired temperature T and relative humidity H.

[0152] In the second automatic selection action, the ventilation controller 100 compares the temperature T with the second upper reference temperature T_U2 and the second lower reference temperature T_L2, and compares the absolute humidity X with the second reference absolute humidity X2.

[0153] In this embodiment, the second upper reference temperature T_U2 is 30°C, and the second lower reference temperature T_L2 is 10°C. Furthermore, the second reference absolute humidity X2 is the absolute humidity of moist air at the second upper reference temperature T_U2 and the second reference relative humidity H2. The second reference relative humidity H2 is 65%. It should be noted that these specific values ​​are merely examples. However, the second upper reference temperature T_U2 is higher than the first upper reference temperature T_U1, the second lower reference temperature T_L2 is lower than the first lower reference temperature T_L1, and the second reference relative humidity H2 is higher than the first reference relative humidity H1.

[0154] When the temperature T is higher than the second upper reference temperature T_U2, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a cooling ventilation mode. When the temperature T is higher than the second lower reference temperature T_L2 and lower than the second upper reference temperature T_U2, and the absolute humidity X is higher than the second reference absolute humidity X2, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a cooling ventilation mode. When the temperature T is higher than the second lower reference temperature T_L2 and lower than the second upper reference temperature T_U2, and the absolute humidity X is lower than the second reference absolute humidity X2, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a simple ventilation mode. When the temperature T is lower than the second lower reference temperature T_L2, the ventilation controller 100 causes the ventilation devices 10a and 10b to operate in a heating ventilation mode.

[0155] As described above, the second upper reference temperature T_U2 is higher than the first upper reference temperature T_U1, the second lower reference temperature T_L2 is lower than the first lower reference temperature T_L1, and the second reference relative humidity H2 is higher than the first reference relative humidity H1. In other words, compared to the first automatic selection action, in the second automatic selection action, the ventilation controller 100 enables the ventilation devices 10a and 10b to operate in a simple ventilation mode over a wider range of temperatures and humidity. Therefore, if the comparison is made under the condition that the temperature of the outdoor space 6 changes the same over time, the time during which the ventilation devices 10a and 10b operate in the simple ventilation mode (that is, the time when the compressor 82 stops) is longer during the execution of the second automatic selection action compared to the execution of the first automatic selection action. Therefore, the second automatic selection action is a control action that can reduce the energy consumption of the ventilation devices 10a and 10b compared to the first automatic selection action.

[0156] - Coordinated operation of ventilation and air conditioning units-

[0157] In the air conditioning system 50 of this embodiment, each ventilation device 10a and 10b is associated with one air conditioning unit 200a to 200d. Each ventilation device 10a and 10b works in coordination with its corresponding air conditioning unit 200a to 200d.

[0158] <Coordinated operation of the first ventilation unit and the air conditioning unit>

[0159] The first ventilation device 10a installed on the first floor of the residence 1 is associated with one of the first air conditioning device 200a and the second air conditioning device 200b that regulate the air in the first-floor rooms 2a and 2b. In the air conditioning system 50 of this embodiment, the first ventilation device 10a is associated with the first air conditioning device 200a so that the first ventilation device 10a and the first air conditioning device 200a work together.

[0160] In the air conditioning system 50 of this embodiment, the air exchange controller 100 of the first air exchange device 10a is capable of communicating with the air conditioning controller 250 of the first air conditioning device 200a (see reference). Figure 5 The ventilation controller 100 of the first ventilation device 10a receives the operating information output by the air conditioning controller 250 of the first air conditioning device 200a.

[0161] The operating information output by the air conditioning controller 250 of the first air conditioning unit 200a includes information indicating that the first air conditioning unit 200a has started the cooling mode, dehumidification mode and heating mode respectively, and information indicating that the first air conditioning unit 200a has ended the cooling mode, dehumidification mode and heating mode respectively.

[0162] When the ventilation controller 100 of the first ventilation device 10a receives information indicating that the first air conditioning unit 200a has started heating mode as operating information, it performs a second automatic selection operation. Additionally, when the ventilation controller 100 of the first ventilation device 10a receives information indicating that the first air conditioning unit 200a has started cooling mode or dehumidification mode as operating information, it performs a first automatic selection operation.

[0163] <Coordinated operation of the second ventilation unit and the air conditioning unit>

[0164] The second ventilation unit 10b, installed on the second floor of residential building 1, is associated with one of the third air conditioning unit 200c and the fourth air conditioning unit 200d, which regulate the air in the second-floor rooms 2c and 2d. In the air conditioning system 50 of this embodiment, the second ventilation unit 10b is associated with the third air conditioning unit 200c, so that the second ventilation unit 10b and the third air conditioning unit 200c work together.

[0165] In the air conditioning system 50 of this embodiment, the air exchange controller 100 of the second air exchange device 10b is able to communicate with the air conditioning controller 250 of the third air conditioning device 200c (see reference). Figure 5 The ventilation controller 100 of the second ventilation device 10b receives the operating information output by the air conditioning controller 250 of the third air conditioning device 200c.

[0166] The operating information output by the air conditioning controller 250 of the third air conditioning unit 200c includes information indicating that the third air conditioning unit 200c has started the cooling mode, dehumidification mode and heating mode respectively, and information indicating that the third air conditioning unit 200c has ended the cooling mode, dehumidification mode and heating mode respectively.

[0167] When the ventilation controller 100 of the second ventilation device 10b receives information indicating that the third air conditioning unit 200c has started heating mode, it performs a second automatic selection operation. Conversely, when the ventilation controller 100 of the second ventilation device 10b receives information indicating that the third air conditioning unit 200c has started cooling mode or dehumidification mode, it performs a first automatic selection operation.

[0168] <Coordination related to the heating mode of the air conditioning unit>

[0169] The coordinated operation of ventilation devices 10a and 10b with air conditioning units 200a and 200c in relation to their heating modes is explained in detail. Here, the coordinated operation of the first ventilation device 10a with the first air conditioning unit 200a is explained, and the coordinated operation of the second ventilation device 10b with the third air conditioning unit 200c is explained in the same way.

[0170] The air conditioning controller 250 of the first air conditioning unit 200a outputs "information indicating that the first air conditioning unit 200a has started the heating mode" as operating information when the first air conditioning unit 200a is started and the heating mode is started, and when the operating mode executed by the first air conditioning unit 200a has been switched from a mode other than the heating mode (e.g., the air supply mode) to the heating mode.

[0171] When the ventilation controller 100 of the first ventilation device 10a receives an operation message indicating that the first air conditioning unit 200a has started heating mode, it performs a second automatic selection operation. If the ventilation controller 100 is performing an operation other than the second automatic selection operation at the time of receiving the operation message, the ventilation controller 100 switches the currently performed operation to the second automatic selection operation. On the other hand, if the ventilation controller 100 is performing the second automatic selection operation at the time of receiving the operation message, the ventilation controller 100 continues to perform the second automatic selection operation.

[0172] When the ventilation controller 100 of the first ventilation device 10a receives an operation message indicating that the first air conditioning unit 200a has ended its heating mode, it performs the same actions as those performed before the first air conditioning unit 200a is about to start its heating mode. If the actions performed before the first air conditioning unit 200a starts its heating mode differ from the second automatic selection action, the ventilation controller 100 ends the second automatic selection action and begins the actions performed before the first air conditioning unit 200a starts its heating mode. Conversely, if the second automatic selection action is also performed before the first air conditioning unit 200a starts its heating mode, the ventilation controller 100 continues to execute the second automatic selection action.

[0173] Reference Figure 7 A specific example of the coordinated operation of the ventilation devices 10a and 10b with the air conditioning units 200a and 200c in relation to the heating mode of the air conditioning units 200a and 200c will be explained.

[0174] exist Figure 7 In the example shown, before time t1, the first air conditioning unit 200a stops, and the ventilation controller 100 of the first ventilation unit 10a performs a first automatic selection action. In this example, the temperature T measured by the temperature and humidity sensor 105 is lower than the first lower reference temperature T_L1. Therefore, the ventilation controller 100 performing the first automatic selection action causes the first ventilation unit 10a to operate in a heating ventilation mode.

[0175] At time t1, when the occupant of residence 1 starts the first air conditioning unit 200a and instructs to start the heating mode, the first air conditioning unit 200a starts the heating mode. The air conditioning controller 250 of the first air conditioning unit 200a outputs information indicating that the first air conditioning unit 200a has started operating in the heating mode. Upon receiving this operating information, the ventilation controller 100 of the first ventilation unit 10a ends the first automatic selection action and begins the second automatic selection action.

[0176] exist Figure 7 In the example shown, at time t1, the temperature T measured by the temperature and humidity sensor 105 is higher than the second lower reference temperature T_L2. Therefore, the ventilation controller 100, which has started the second automatic selection operation, changes the operating mode of the first ventilation device 10a from the heating ventilation mode to the simple ventilation mode. In this way, the ventilation controller 100 changes the operation of the first ventilation device 10a as the second automatic selection operation begins.

[0177] At time t2, when the occupant of residence 1 stops the first air conditioning unit 200a, the first air conditioning unit 200a ends its heating mode. The air conditioning controller 250 of the first air conditioning unit 200a outputs information indicating that the first air conditioning unit 200a has ended its heating mode operation. Upon receiving this operation information, the ventilation controller 100 of the first ventilation unit 10a ends its second automatic selection operation and begins its first automatic selection operation.

[0178] exist Figure 7 In the example shown, at time t2, the temperature T measured by the temperature and humidity sensor 105 is lower than the first lower reference temperature T_L1. Therefore, the ventilation controller 100, which has initiated the first automatic selection action, changes the operating mode of the first ventilation device 10a from the simple ventilation mode to the heating ventilation mode. In this way, when the ventilation controller 100 receives information indicating that the first air conditioning unit 200a has ended its heating mode operation, it causes the operating mode of the first ventilation device 10a to revert to the heating ventilation mode performed by the first ventilation device 10a before time t1.

[0179] <Coordination with the cooling and dehumidification modes of the air conditioning unit>

[0180] The coordinated operation of ventilation devices 10a and 10b with air conditioning units 200a and 200c in their cooling and dehumidification modes is explained in detail. Here, the coordinated operation of the first ventilation device 10a with the first air conditioning unit 200a is explained, and the coordinated operation of the second ventilation device 10b with the third air conditioning unit 200c is explained in the same way.

[0181] When the first air conditioning unit 200a is started and begins cooling or dehumidification mode, or when the operating mode of the first air conditioning unit 200a has been switched from a mode other than cooling or dehumidification mode (e.g., air supply mode) to cooling or dehumidification mode, the air conditioning controller 250 of the first air conditioning unit 200a outputs "information indicating that the first air conditioning unit 200a has started cooling mode" or "information indicating that the first air conditioning unit 200a has started dehumidification mode" as operating information.

[0182] When the ventilation controller 100 of the first ventilation device 10a receives operating information indicating that either the first air conditioning unit 200a has started cooling mode or dehumidification mode, it performs a first automatic selection operation. If the ventilation controller 100 is performing an operation other than the first automatic selection operation at the time of receiving these operating information, it switches the currently performed operation to the first automatic selection operation. Conversely, if the ventilation controller 100 is performing the first automatic selection operation at the time of receiving these operating information, it continues to perform the first automatic selection operation.

[0183] When the ventilation controller 100 of the first ventilation device 10a receives information indicating that the first air conditioning unit 200a has ended its cooling mode or dehumidification mode, it performs the same actions as those performed before the first air conditioning unit 200a is about to start its cooling or dehumidification mode. If the actions performed before the first air conditioning unit 200a is about to start its cooling or dehumidification mode differ from the first automatic selection action, the ventilation controller 100 ends the first automatic selection action and begins the actions performed before the first air conditioning unit 200a is about to start its cooling or dehumidification mode. Conversely, if the first automatic selection action is also being performed before the first air conditioning unit 200a is about to start its cooling or dehumidification mode, the ventilation controller 100 continues to execute the first automatic selection action.

[0184] Reference Figure 8 A specific example of the coordinated operation of the ventilation devices 10a and 10b, which are related to the cooling and dehumidification modes of the air conditioning units 200a and 200c, with the air conditioning units 200a and 200c will be explained.

[0185] exist Figure 8 In the example shown, before time t1, the first air conditioning unit 200a stops, and the ventilation controller 100 of the first ventilation unit 10a executes a second automatic selection action. In this example, the temperature T measured by the temperature and humidity sensor 105 is lower than the second upper reference temperature T_U2, and the absolute humidity X calculated based on the measurement value of the temperature and humidity sensor 105 is below the second reference absolute humidity X2. Therefore, the ventilation controller 100 executing the second automatic selection action causes the first ventilation unit 10a to execute a simple ventilation mode.

[0186] At time t1, when an occupant in residence 1 activates the first air conditioning unit 200a and instructs it to start either cooling or dehumidification mode, the first air conditioning unit 200a begins operating in either mode. The air conditioning controller 250 of the first air conditioning unit 200a outputs information indicating that either the first air conditioning unit 200a has started operating in cooling mode or dehumidification mode. Upon receiving this operating information, the ventilation controller 100 of the first ventilation device 10a terminates the second automatic selection operation and begins the first automatic selection operation.

[0187] exist Figure 8 In the example shown, at time t1, the temperature T measured by the temperature and humidity sensor 105 is higher than the first upper reference temperature T_U1. Therefore, the ventilation controller 100, which has started the first automatic selection action, changes the operating mode of the first ventilation device 10a from the simple ventilation mode to the cooling ventilation mode. In this way, the ventilation controller 100 changes the operation of the first ventilation device 10a as the first automatic selection action is started.

[0188] At time t2, when the occupant of residence 1 stops the first air conditioning unit 200a, the first air conditioning unit 200a ends its cooling or dehumidification mode. The air conditioning controller 250 of the first air conditioning unit 200a outputs information indicating that the first air conditioning unit 200a has ended its cooling mode operation or that the first air conditioning unit 200a has ended its dehumidification mode operation. Upon receiving this operation information, the ventilation controller 100 of the first ventilation device 10a ends its first automatic selection operation and begins its second automatic selection operation.

[0189] exist Figure 8 In the example shown, at time t2, the temperature T measured by the temperature and humidity sensor 105 is lower than the second upper reference temperature T_U2, and the absolute humidity X calculated based on the measurement value of the temperature and humidity sensor 105 is below the second reference absolute humidity X2. Therefore, the ventilation controller 100, which has started the second automatic selection operation, changes the operating mode of the first ventilation device 10a from the cooling ventilation mode to the simple ventilation mode. In this way, when the ventilation controller 100 receives information indicating that the first air conditioning unit 200a has ended the cooling mode or the dehumidification mode, it causes the operating mode of the first ventilation device 10a to return to the simple ventilation mode that the first ventilation device 10a was performing before time t1.

[0190] - Volume of indoor heat exchanger and utilization side heat exchanger -

[0191] As described above, the indoor heat exchangers 225 of each air conditioning unit 200a to 200d and the utilization-side heat exchangers 25 of each ventilation unit 10a and 10b are finned tube air heat exchangers. In the air conditioning system 50 of this embodiment, the volume of the indoor heat exchanger 225 is larger than the volume of the utilization-side heat exchanger 25.

[0192] Here, refer to Figure 9 and Figure 10 The volume of the finned tube air heat exchanger 300 is described. Figure 9 and Figure 10 A typical finned tube air heat exchanger 300 is shown.

[0193] The air heat exchanger 300 includes multiple fins 302 and multiple heat transfer tubes 303. Each fin 302 is formed in the shape of a plate. The multiple fins 302 are arranged in a row at certain intervals. The multiple fins 302 form a fin group 301. The heat transfer tubes 303 pass through each fin 302 constituting the fin group 301. The heat transfer tubes 303 include multiple straight tube sections 304 and multiple bent tube sections 305. The straight tube sections 304 pass through the fin group 301, and the bent tube sections 305 connect adjacent straight tube sections 304.

[0194] Multiple straight tube sections 304 are arranged in the length direction (layer direction) and width direction (row direction) of the fin 302. Figure 10 In the air heat exchanger 300 shown, seven straight tube sections 304 are arranged in the layer direction, and two straight tube sections 304 are arranged in the column direction. Therefore, in Figure 10 The air heat exchanger 300 shown has fourteen straight pipe sections 304.

[0195] The volume of the air heat exchanger 300 is the sum of the internal volumes of each straight pipe section 304. Therefore, the volume V of the air heat exchanger 300 is calculated by the following mathematical formula.

[0196] V = A × L × N

[0197] In the above mathematical formula, "A" is the cross-sectional area of ​​the internal space of the straight pipe section 304, "L" is the effective length of the air heat exchanger 300, and "N" is the number of straight pipe sections 304. For example... Figure 9 As shown, the effective length L of the air heat exchanger 300 is the length from one end of the fin assembly 301 to the other end.

[0198] In the case of the indoor heat exchanger 225 of this embodiment, A = 18.3 mm², L = 610 mm, and N = 36 units. Therefore, the volume of the indoor heat exchanger 225 is V = 402 cm³.

[0199] In this embodiment, the utilization-side heat exchanger 25 has A = 37.1 mm², L = 330 mm, and N = 24 units. Therefore, the volume of the utilization-side heat exchanger 25 is V = 294 cm³.

[0200] - Temperature of indoor heat exchanger and utilization side heat exchanger -

[0201] The temperature of the indoor heat exchanger 225 is the value measured by the heat exchanger temperature sensor 256. When the air conditioning units 200a and 200c are in cooling mode, the value measured by the heat exchanger temperature sensor 256 is essentially equal to the evaporation temperature of the refrigerant in the indoor heat exchanger 225.

[0202] The temperature of the heat exchanger 25 is the measurement value of the heat exchanger temperature sensor 106. When the ventilation devices 10a and 10b are in cooling ventilation mode, the measurement value of the heat exchanger temperature sensor 106 is substantially equal to the evaporation temperature of the refrigerant in the heat exchanger 25.

[0203] As described above, in the air conditioning system 50 of this embodiment, the first ventilation device 10a is associated with the first air conditioning unit 200a, and the second ventilation device 10b is associated with the third air conditioning unit 200c. In the air conditioning system 50 of this embodiment, there is a situation where, while the ventilation devices 10a and 10b are performing cooling ventilation mode, the air conditioning units 200a and 200c corresponding to the ventilation devices 10a and 10b are performing cooling mode.

[0204] For example, the first ventilation unit 10a, operating in cooling ventilation mode, supplies outdoor air cooled in the utilization side heat exchanger 25 to the first room 2a. By supplying cooled outdoor air through the first ventilation unit 10a, a portion of the cooling load in the first room 2a is handled. As a result, the load handled by the first air conditioning unit 200a in the cooling load of the first room 2a is reduced. Therefore, typically, the temperature of the indoor heat exchanger 225 of the first air conditioning unit 200a operating in cooling mode is higher than the temperature of the utilization side heat exchanger 25 of the first ventilation unit 10a operating in cooling ventilation mode.

[0205] A specific example is shown. Assume the outdoor air temperature in the outdoor space is 28°C and the relative humidity is 80%, and the indoor air temperature in the first room 2a is 28°C and the relative humidity is 60%. In this state, the temperature of the indoor heat exchanger 225 of the first air conditioning unit 200a operating in cooling mode is approximately 15°C, and the temperature of the utilization-side heat exchanger 25 of the first ventilation unit 10a operating in cooling ventilation mode is approximately 12°C.

[0206] - Features of the implementation method (1) -

[0207] In the air conditioning system 50 of this embodiment, the air exchange controller 100 of each air exchange device 10a and 10b changes the operation of the air exchange devices 10a and 10b according to the operating mode executed by the corresponding air conditioning devices 200a and 200c. Therefore, the air exchange devices 10a and 10b can be made to operate in an appropriate state corresponding to the operating mode executed by the air conditioning devices 200a and 200c, thereby enabling proper control of the air conditioning system 50.

[0208] In particular, in the air conditioning system 50 of this embodiment, the air exchange controller 100 of each air exchange device 10a, 10b changes the heat exchange capacity of the utilization side heat exchanger 25 (see reference) according to the operating mode executed by the corresponding air conditioning device 200a, 200c. Figure 7 , Figure 8 Therefore, the state of outdoor air supplied to the room by the ventilation devices 10a and 10b can be appropriately adjusted according to the operating mode performed by the air conditioning units 200a and 200c.

[0209] - Features of the implementation method (2) -

[0210] exist Figure 7 In the specific example shown, regarding the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c start in heating mode during the operation of the heating and ventilation modes of the ventilation units 10a and 10b, the ventilation controller 100 stops the heat exchangers 25 on the utilization side of the ventilation units 10a and 10b from heating the outdoor air. In other words, the ventilation controller 100 reduces the heating amount of the heat exchangers 25 on the utilization side of the ventilation units 10a and 10b to zero.

[0211] Therefore, compared to the case where the ventilation controller 100 does not change the heating amount of the heat exchanger 25 on the utilization side of the ventilation devices 10a and 10b, the proportion of the heating load of the indoor space 5 handled by the indoor heat exchanger 225 of the air conditioning units 200a and 200c increases, while the proportion of the load handled by the heat exchanger 25 on the utilization side of the ventilation devices 10a and 10b decreases.

[0212] In this embodiment of the air conditioning system 50, the volume of the indoor heat exchanger 225 of the air conditioning units 200a and 200c is larger than the volume of the utilization-side heat exchanger 25 of the ventilation units 10a and 10b. Generally speaking, the larger the volume of the heat exchanger, the higher its heat exchange capacity. Therefore, the heat exchange capacity of the indoor heat exchanger 225 of the air conditioning units 200a and 200c is greater than the heat exchange capacity of the utilization-side heat exchanger 25 of the ventilation units 10a and 10b.

[0213] Generally, the greater the heat exchange capacity of a heat exchanger installed in a refrigerant circuit, the higher the COP (coefficient of performance) of the refrigeration cycle in that refrigerant circuit. Therefore, in the air conditioning system 50 of this embodiment, the COP of the refrigeration cycle performed in the refrigerant circuit 220 of the air conditioning units 200a and 200c is higher than the COP of the refrigeration cycle performed in the refrigerant circuit R of the ventilation units 10a and 10b.

[0214] As mentioned above, in Figure 7 In the specific example shown, regarding the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c start in heating mode while the ventilation units 10a and 10b are in heating ventilation mode, the ventilation controller 100 stops the heat exchangers 25 on the utilization side of the ventilation units 10a and 10b from heating the outdoor air. As a result, the proportion of the heating load in the indoor space 5 handled by the indoor heat exchangers 225 of the air conditioning units 200a and 200c, which have a relatively high COP, increases, while the proportion of the load handled by the heat exchangers 25 on the utilization side of the ventilation units 10a and 10b, which have a relatively low COP, decreases.

[0215] Therefore, in the air conditioning system 50 of this embodiment, by having the air conditioning units 200a and 200c with relatively high COP handle a large amount of heating load, the overall power consumption of the air conditioning system 50 can be reduced.

[0216] - Features of the implementation method (3) -

[0217] exist Figure 8 In the specific example shown, with regard to the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c start the cooling mode or dehumidification mode in the state where the heat exchanger 25 on the utilization side of the ventilation units 10a and 10b has stopped cooling the outdoor air, the ventilation controller 100 causes the heat exchanger 25 on the utilization side to start cooling the outdoor air.

[0218] Therefore, compared to the case where the heat exchanger 25 on the utilization side of the ventilation devices 10a and 10b remains uncooled, the proportion of the cooling load (sensible heat load and latent heat load) of the indoor space 5 handled by the indoor heat exchanger 225 of the air conditioning units 200a and 200c decreases, while the proportion of the load handled by the heat exchanger 25 on the utilization side of the ventilation devices 10a and 10b increases.

[0219] Here, under the condition of air conditioning in indoor space 5 during summer, the temperature and humidity of outdoor air in outdoor space 6 are higher than those of indoor air in indoor space 5. Therefore, the dew point of outdoor air in outdoor space 6 is higher than that of indoor air in indoor space 5. Consequently, in the heat exchangers 25 of the ventilation devices 10a and 10b that exchange heat between outdoor air and refrigerant, compared to the indoor heat exchangers 225 of the air conditioning devices 200a and 200c that exchange heat between indoor air and refrigerant, the difference between the dew point of the air and the temperature of the heat exchanger is greater, resulting in an increase in the amount of condensate generated.

[0220] In particular, in the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c are operating in cooling or dehumidification mode and the ventilation units 10a and 10b are operating in cooling ventilation mode, the temperature of the indoor heat exchanger 225 of the air conditioning units 200a and 200c is higher than the temperature of the utilization side heat exchanger 25 of the ventilation units 10a and 10b. Therefore, the proportion of the cooling load (sensible heat load and latent heat load) of the indoor space 5 handled by the indoor heat exchanger 225 of the air conditioning units 200a and 200c is relatively low, while the proportion of the load handled by the utilization side heat exchanger 25 of the ventilation units 10a and 10b is relatively high.

[0221] Therefore, in the air conditioning system 50 of this embodiment, by having the ventilation devices 10a and 10b, which generate a large amount of condensate, handle a large amount of latent heat load (dehumidification load), the overall power consumption of the air conditioning system 50 can be reduced.

[0222] - Features of the implementation method (4) -

[0223] like Figure 7 As shown, in the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c start heating mode during the first automatic selection operation performed by the air exchange controller 100 of the air exchange units 10a and 10b, the air exchange controller 100 temporarily ends the first automatic selection operation and starts the second automatic selection operation. Furthermore, if the air conditioning units 200a and 200c subsequently end the heating mode, the air exchange controller 100 ends the second automatic selection operation and starts the first automatic selection operation again.

[0224] The result of the ventilation controller 100 of ventilation devices 10a and 10b performing this action is that, Figure 7In the specific example shown, when air conditioning units 200a and 200c start in heating mode, ventilation units 10a and 10b end the heating and ventilation mode and start in simple ventilation mode. Furthermore, when air conditioning units 200a and 200c end the heating mode, ventilation units 10a and 10b restart the heating and ventilation mode that was in place before air conditioning units 200a and 200c started the heating mode.

[0225] like Figure 8 As shown, in the air conditioning system 50 of this embodiment, when the air conditioning units 200a and 200c start cooling mode or dehumidification mode during the second automatic selection operation performed by the air exchange controller 100 of the air exchange units 10a and 10b, the air exchange controller 100 temporarily ends the second automatic selection operation and starts the first automatic selection operation. Furthermore, if the air conditioning units 200a and 200c subsequently end the cooling mode or dehumidification mode, the air exchange controller 100 ends the first automatic selection operation and starts the second automatic selection operation again.

[0226] The result of the ventilation controller 100 of ventilation devices 10a and 10b performing this action is that, Figure 8 In the specific example shown, when air conditioning units 200a and 200c start in cooling or dehumidification mode, ventilation units 10a and 10b end the simple ventilation mode and start the cooling ventilation mode. Furthermore, when air conditioning units 200a and 200c end the cooling or dehumidification mode, ventilation units 10a and 10b resume the simple ventilation mode that was in place before air conditioning units 200a and 200c started the cooling or dehumidification mode.

[0227] - Features of the implementation method (5) -

[0228] In the air conditioning system 50 of this embodiment, the air exchange controller 100 of the air exchange devices 10a and 10b switches the operating mode performed by the air exchange devices 10a and 10b based on the measurement values ​​of the temperature and humidity sensor 105. As a result, the amount of heat exchanged in the air exchange devices 10a and 10b using the side heat exchanger 25 is changed according to the temperature and humidity of the outdoor air flowing to the side heat exchanger 25 after passing through the total heat exchanger 21.

[0229] - Variation 1 of the implementation method -

[0230] exist Figure 7 In the specific example shown, when the air conditioning units 200a and 200c corresponding to the ventilation units 10a and 10b start the heating mode during the execution of the heating ventilation mode, the ventilation controller 100 of each ventilation unit 10a and 10b switches the operating mode executed by the ventilation units 10a and 10b from the heating ventilation mode to the simple ventilation mode.

[0231] When each ventilation device 10a and 10b is configured to change the speed of the compressor 82, the ventilation controller 100 of each ventilation device 10a and 10b can also be adjusted. Figure 11 The control action shown is used instead of the control action described above.

[0232] It should be noted that, Figure 11 The numbers "100" and "0" recorded indicate the operating status of the compressor 82 of the ventilation devices 10a and 10b. "100" indicates that the compressor 82 is at its maximum speed. "0" indicates that the compressor 82 has stopped.

[0233] like Figure 11 As shown, when the air conditioning units 200a and 200c corresponding to the ventilation units 10a and 10b start their heating mode during the heating and ventilation mode, the ventilation controllers 100 of each ventilation unit 10a and 10b can also control the speed of the compressors 82 of the ventilation units 10a and 10b to reduce their speed. When the ventilation controllers 100 perform this control action, the heating amount in the heat exchangers 25 on the utilization side of the ventilation units 10a and 10b will decrease when the air conditioning units 200a and 200c corresponding to the ventilation units 10a and 10b start their heating mode during the heating and ventilation mode.

[0234] -Modification 2 of the implementation method-

[0235] The air conditioning system 50 of this embodiment can also be configured to switch between air conditioning units 200a to 200d that work in conjunction with each ventilation unit 10a, 10b. Specifically, it can switch between a state in which the first ventilation unit 10a works in conjunction with the first air conditioning unit 200a and a state in which the first ventilation unit 10a works in conjunction with the second air conditioning unit 200b. It can also switch between a state in which the second ventilation unit 10b works in conjunction with the third air conditioning unit 200c and a state in which the second ventilation unit 10b works in conjunction with the fourth air conditioning unit 200d.

[0236] - Modification of the implementation method 3 -

[0237] The air conditioning system 50 in this embodiment can also be configured such that each ventilation device 10a, 10b works in conjunction with multiple air conditioning units 200a to 200d. Specifically, the first ventilation device 10a can also work in conjunction with both the first air conditioning unit 200a and the second air conditioning unit 200b. Furthermore, the second ventilation device 10b can also work in conjunction with both the third air conditioning unit 200c and the fourth air conditioning unit 200d.

[0238] The following explanation will take the case where the first ventilation device 10a, the first air conditioning unit 200a, and the second air conditioning unit 200b work together as an example. When the ventilation controller 100 of the first ventilation device 10a performs a first automatic selection action, and either the first air conditioning unit 200a or the second air conditioning unit 200b starts in heating mode, the ventilation controller 100 of the first ventilation device 10a ends the first automatic selection action and begins a second automatic selection action. Conversely, when the ventilation controller 100 of the first ventilation device 10a performs a second automatic selection action, and either the first air conditioning unit 200a or the second air conditioning unit 200b starts in cooling mode or dehumidification mode, the ventilation controller 100 of the first ventilation device 10a ends the second automatic selection action and begins the first automatic selection action.

[0239] -Modification of the implementation method 4-

[0240] In the air conditioning system 50 of this embodiment, the first indoor unit 212a and the second indoor unit 212b installed on the first floor of the residence 1 can also be connected to one outdoor unit. Similarly, the third indoor unit 212c and the fourth indoor unit 212d installed on the second floor of the residence 1 can also be connected to one outdoor unit.

[0241] - Variation of the implementation method 5 -

[0242] In the air conditioning system 50 of this embodiment, the air exchange controller 100 of the air exchange devices 10a and 10b changes the operation of the air exchange devices 10a and 10b according to the operating mode executed by the corresponding air conditioning devices 200a and 200c.

[0243] The air conditioning system 50 of this embodiment may also include a control device in addition to the ventilation controller 100 and the air conditioning controller 250. This control device performs the action of "changing the operation of the ventilation devices 10a and 10b according to the operating mode performed by the air conditioning devices 200a and 200c". This control device may also be installed in the residence 1 where the air conditioning system 50 is installed. Alternatively, the control device may be installed in a location away from the residence 1 and configured to communicate with the ventilation controller 100 and the air conditioning controller 250 via a communication line such as the Internet.

[0244] The embodiments and variations have been described above. However, it should be understood that various changes can be made to their form and specific details without departing from the spirit and scope of the claims. Furthermore, appropriate combinations or substitutions can be made to the above embodiments, variations, and other embodiments as long as the function of the object of this disclosure is not impaired. Additionally, the terms "first," "second," "third," etc., used above are only used to distinguish statements containing these terms and do not limit the number or order of the statements.

[0245] -Industry Applicability-

[0246] In conclusion, this disclosure is very useful for air conditioning systems.

[0247] - Symbol Explanation -

[0248] 10a First ventilation device

[0249] 10b Second ventilation device

[0250] 21 Total heat exchanger (first heat exchanger)

[0251] 25. Utilize a side heat exchanger (second heat exchanger)

[0252] 50 Air conditioning system

[0253] 100 Ventilation Controller (Controller)

[0254] 105 Temperature and Humidity Sensor (Sensor)

[0255] 200a First Air Conditioning Unit

[0256] 200b Second Air Conditioning Unit

[0257] 200c Third air conditioning unit

[0258] 200d Fourth Air Conditioning Unit

[0259] 225 Indoor heat exchanger (third heat exchanger)

Claims

1. An air conditioning system, the air conditioning system comprising an air exchange device (10a, 10b), an air conditioning unit (200a, 200c), and a controller (100). The ventilation devices (10a, 10b) have a first heat exchanger (21) for exchanging heat between outdoor air and indoor air, and a second heat exchanger (25) for exchanging heat between outdoor air that has passed through the first heat exchanger (21) and a heat medium. The ventilation devices (10a, 10b) supply outdoor air to the room and exhaust indoor air to the outside. The air conditioning unit (200a, 200c) has a third heat exchanger (225) for exchanging heat between indoor air and a heat medium, and the air conditioning unit (200a, 200c) is capable of performing multiple operating modes. The controller (100) changes the operation of the ventilation devices (10a, 10b) according to the operating mode performed by the air conditioning units (200a, 200c). The controller (100) changes the heat exchange capacity of the second heat exchanger (25) of the ventilation device (10a, 10b) according to the operating mode performed by the air conditioning unit (200a, 200c). The air conditioning system is characterized in that... The operating modes that the air conditioning units (200a, 200c) can perform include an indoor air heating mode in which indoor air is heated in the third heat exchanger (225). The ventilation devices (10a, 10b) are capable of performing an outdoor air heating mode in which outdoor air is heated in the second heat exchanger (25). When the air conditioning unit (200a, 200c) starts the indoor air heating mode during the outdoor air heating mode of the ventilation device (10a, 10b), the controller (100) reduces the heating amount of the second heat exchanger (25) of the ventilation device (10a, 10b) or stops the second heat exchanger (25) from heating the outdoor air.

2. An air conditioning system, the air conditioning system comprising an air exchange device (10a, 10b), an air conditioning unit (200a, 200c), and a controller (100). The ventilation devices (10a, 10b) have a first heat exchanger (21) for exchanging heat between outdoor air and indoor air, and a second heat exchanger (25) for exchanging heat between outdoor air that has passed through the first heat exchanger (21) and a heat medium. The ventilation devices (10a, 10b) supply outdoor air to the room and exhaust indoor air to the outside. The air conditioning unit (200a, 200c) has a third heat exchanger (225) for exchanging heat between indoor air and a heat medium, and the air conditioning unit (200a, 200c) is capable of performing multiple operating modes. The controller (100) changes the operation of the ventilation devices (10a, 10b) according to the operating mode performed by the air conditioning units (200a, 200c). The controller (100) changes the heat exchange capacity of the second heat exchanger (25) of the ventilation device (10a, 10b) according to the operating mode performed by the air conditioning unit (200a, 200c). The air conditioning system is characterized in that... The operating modes that the air conditioning units (200a, 200c) can perform include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225). When the air conditioning unit (200a, 200c) starts the indoor air cooling mode while the second heat exchanger (25) of the ventilation device (10a, 10b) stops cooling the outdoor air, the controller (100) causes the second heat exchanger (25) to start cooling the outdoor air.

3. An air conditioning system, the air conditioning system comprising an air exchange device (10a, 10b), an air conditioning unit (200a, 200c), and a controller (100). The ventilation devices (10a, 10b) have a first heat exchanger (21) for exchanging heat between outdoor air and indoor air, and a second heat exchanger (25) for exchanging heat between outdoor air that has passed through the first heat exchanger (21) and a heat medium. The ventilation devices (10a, 10b) supply outdoor air to the room and exhaust indoor air to the outside. The air conditioning unit (200a, 200c) has a third heat exchanger (225) for exchanging heat between indoor air and a heat medium, and the air conditioning unit (200a, 200c) is capable of performing multiple operating modes. The controller (100) changes the operation of the ventilation devices (10a, 10b) according to the operating mode performed by the air conditioning units (200a, 200c). The air conditioning system is characterized in that... The operating modes that the air conditioning units (200a, 200c) can perform include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225). The ventilation devices (10a, 10b) are capable of performing an outdoor air cooling mode in which outdoor air is cooled in the second heat exchanger (25). When the air conditioning unit (200a, 200c) is in the indoor air cooling mode and the ventilation unit (10a, 10b) is in the outdoor air cooling mode, the temperature of the third heat exchanger (225) is higher than the temperature of the second heat exchanger (25).

4. The air conditioning system according to any one of claims 1 to 3, characterized in that: The volume of the third heat exchanger (225) of the air conditioning unit (200a, 200c) is greater than the volume of the second heat exchanger (25) of the ventilation unit (10a, 10b).

5. The air conditioning system according to any one of claims 1 to 3, characterized in that: Even if the air conditioning unit (200a, 200c) stops while the ventilation unit (10a, 10b) is working, the controller (100) will cause the ventilation unit (10a, 10b) to continue working.

6. The air conditioning system according to claim 5, characterized in that: After the air conditioning units (200a, 200c) stop, the controller (100) causes the ventilation units (10a, 10b) to perform the same actions as those performed by the ventilation units (10a, 10b) before the air conditioning units (200a, 200c) are started.

7. The air conditioning system according to any one of claims 1 to 3, characterized in that: The ventilation devices (10a, 10b) include a sensor (105) that measures the temperature and humidity of the outdoor air flowing from the first heat exchanger (21) to the second heat exchanger (25). The controller (100) changes the heat exchange rate of the second heat exchanger (25) based on the measurement value of the sensor (105).

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