Air-conditioning system

Abstract

To suitably control an air-conditioning system having air conditioners and ventilators.SOLUTION: An air-conditioning system (50) comprises ventilators (10a, 10b), air conditioners (200a, 200c) and a controller (100). The ventilators supply outdoor air into a room, and discharge indoor air to the outside of the room. The ventilators have a first heat exchanger (21) for making the outdoor air exchange heat with the indoor air, and a second heat exchanger (25) for making the outdoor air exchange heat with a thermal medium. The air conditioners can perform a plurality of operation modes. The controller changes operations of the ventilators according to the operation modes which are performed by the air conditioner.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to air conditioning systems. [Background technology]

[0002] Conventionally, air conditioning systems equipped with an air conditioner and a ventilation device have been known. This air conditioning system is disclosed in, for example, Patent Document 1. In Patent Document 1, the ventilation device is equipped with a heat exchanger that exchanges heat between outdoor air supplied to the room and indoor air discharged to the outside. Patent Document 1 describes that the amount of air supplied by the ventilation device is adjusted depending on whether the air conditioner is operating or stopped. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-172961 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the air conditioning system of Patent Document 1, the control of the ventilation device takes into consideration whether the air conditioning device is operating or stopped. Therefore, in conventional air conditioning systems, there is a risk that the operation of the entire air conditioning system cannot be appropriately controlled.

[0005] An object of the present disclosure is to appropriately control an air conditioning system equipped with an air conditioner and a ventilator. [Means for solving the problem]

[0006] A first aspect of the present disclosure is an air conditioning system (50) including a first heat exchanger (21) that exchanges heat between outdoor air and indoor air, and a second heat exchanger (25) that exchanges heat between the outdoor air that has passed through the first heat exchanger (21) and a heat medium, a ventilation device (10a, 10b) that supplies the outdoor air to the room and exhausts the indoor air to the outside, an air conditioner (200a, 200c) that has a third heat exchanger (225) that exchanges heat between the indoor air and the heat medium and is capable of executing a plurality of operation modes, and a controller (100) that changes the operation of the ventilation device (10a, 10b) in accordance with the operation mode executed by the air conditioner (200a, 200c).

[0007] In the first aspect, the ventilation devices (10a, 10b) supply outdoor air that has passed through the first heat exchanger (21) and the second heat exchanger (25) in this order to the room. The controller (100) changes the operation of the ventilation devices (10a, 10b) in accordance with the operation mode executed by the air conditioners (200a, 200c). This makes it possible to operate the ventilation devices (10a, 10b) in an appropriate state in accordance with the operation mode executed by the air conditioners (200a, 200c), thereby making it possible to appropriately control the air conditioning system (50).

[0008] A second aspect of the present disclosure is related to the first aspect, wherein the controller (100) changes the heat exchange amount of the second heat exchanger (25) of the ventilation device (10a, 10b) depending on the operation mode performed by the air conditioning device (200a, 200c).

[0009] In the second mode, the state of the outdoor air supplied to the room by the ventilation devices (10a, 10b) changes depending on the operation mode performed by the air conditioners (200a, 200c) through the operation of the controller (100).

[0010] A third aspect of the present disclosure is characterized in that, in the second aspect, the operating modes executable by the air conditioners (200a, 200c) include an indoor air heating mode in which indoor air is heated in the third heat exchanger (225), and the ventilation devices (10a, 10b) are capable of executing an outdoor air heating mode in which outdoor air is heated in the second heat exchanger (25), and when the air conditioners (200a, 200c) start the indoor air heating mode while the ventilation devices (10a, 10b) are executing the outdoor air heating mode, the controller (100) reduces the amount of heating of the second heat exchanger (25) of the ventilation devices (10a, 10b) or stops heating of the outdoor air in the second heat exchanger (25).

[0011] In the third aspect, when the air conditioners (200a, 200c) start the inside air heating mode while the ventilation devices (10a, 10b) are executing the outside air heating mode, the controller (100) changes the amount of heat applied to the outdoor air by the second heat exchanger (25) of the ventilation devices (10a, 10b). As a result, compared to a case in which the controller (100) does not change the amount of heat applied to the outdoor air by the second heat exchanger (25) of the ventilation devices (10a, 10b), the proportion of the heating load of the indoor space that is processed by the third heat exchanger (225) of the air conditioners (200a, 200c) becomes higher and the proportion of the load that is processed by the second heat exchanger (25) of the ventilation devices (10a, 10b) becomes lower.

[0012] A fourth aspect of the present disclosure is characterized in that, in the second aspect, the operating modes executable by the air conditioners (200a, 200c) include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225), and the controller (100) starts cooling the outdoor air in the second heat exchanger (25) when the air conditioners (200a, 200c) start the indoor air cooling mode while cooling of the outdoor air in the second heat exchanger (25) of the ventilation device (10a, 10b) is stopped.

[0013] In the fourth aspect, when the air conditioners (200a, 200c) start the inside air cooling mode while the cooling of the outdoor air in the second heat exchanger (25) of the ventilation devices (10a, 10b) is stopped, the controller (100) starts cooling the outdoor air in the second heat exchanger (25). Therefore, compared with the case where the cooling of the outdoor air in the second heat exchanger (25) of the ventilation devices (10a, 10b) remains stopped, the proportion of the cooling load of the indoor space (5) processed by the third heat exchanger (225) of the air conditioners (200a, 200c) becomes lower and the proportion of the load processed by the second heat exchanger (25) of the ventilation devices (10a, 10b) becomes higher.

[0014] A fifth aspect of the present disclosure is characterized in that, in the first aspect, the operating modes executable by the air conditioning apparatus (200a, 200c) include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225), and the ventilation apparatus (10a, 10b) is capable of executing an outdoor air cooling mode in which outdoor air is cooled in the second heat exchanger (25), and when the air conditioning apparatus (200a, 200c) executes the indoor air cooling mode and the ventilation apparatus (10a, 10b) executes the outdoor air cooling mode, the temperature of the third heat exchanger (225) is higher than the temperature of the second heat exchanger (25).

[0015] In the fifth aspect, when the air conditioning units (200a, 200c) are operating in the indoor air cooling mode and the ventilation units (10a, 10b) are operating in the outdoor air cooling mode, the cooling load of the indoor space is relatively small, and the load is relatively large, that is, the cooling load of the indoor space is processed by the third heat exchanger (225) of the air conditioning units (200a, 200c).

[0016] A sixth aspect of the present disclosure is any one of the first to fifth aspects, wherein the volume of the third heat exchanger (225) of the air conditioner (200a, 200c) is larger than the volume of the second heat exchanger (25) of the ventilation device (10a, 10b).

[0017] Generally, 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 conditioner (200a, 200c) is greater than the heat exchange capacity of the second heat exchanger (25) of the ventilation device (10a, 10b).

[0018] A seventh aspect of the present disclosure is any one of the first to sixth aspects, wherein the controller (100) continues to operate the ventilation devices (10a, 10b) even if the air conditioning devices (200a, 200c) are stopped while the ventilation devices (10a, 10b) are operating.

[0019] In the seventh aspect, the controller (100) continues to operate the ventilation devices (10a, 10b) even after the air conditioners (200a, 200c) are stopped while the ventilation devices (10a, 10b) are operating. Therefore, ventilation of the indoor space is continuously performed regardless of the state of the air conditioners (200a, 200c).

[0020] An eighth aspect of the present disclosure is the seventh aspect, wherein, after the air conditioning apparatus (200a, 200c) is stopped, the controller (100) causes the ventilation apparatus (10a, 10b) to perform the same operation as the operation that the ventilation apparatus (10a, 10b) had performed before the air conditioning apparatus (200a, 200c) was started.

[0021] In an eighth embodiment, when the air conditioning apparatus (200a, 200c) is stopped, the controller (100) returns the operation performed by the ventilation apparatus (10a, 10b) to the operation that was being performed by the ventilation apparatus (10a, 10b) before the air conditioning apparatus (200a, 200c) was started.

[0022] A ninth aspect of the present disclosure is any one of the first to eighth aspects, wherein the ventilation device (10a, 10b) includes a sensor (105) that measures the temperature and humidity of the outdoor air passing through the first heat exchanger (21) and heading toward the second heat exchanger (25), and the controller (100) changes the heat exchange amount of the second heat exchanger (25) based on the measurement value of the sensor (105).

[0023] In the ninth aspect, the amount of heat exchange in the second heat exchanger (25) is changed based on the temperature and humidity of the outdoor air passing through the first heat exchanger (21) and flowing toward the second heat exchanger (25). [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram of a house in which an air conditioning system is installed. [Diagram 2] FIG. 2 is a piping diagram showing the configuration of a refrigerant circuit of an air conditioner. [Diagram 3] FIG. 3 is a piping diagram showing the configuration of the refrigerant circuit of the ventilation device. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic configuration of a ventilation unit of the ventilation device. [Diagram 5] FIG. 5 is a block diagram showing the configuration of a ventilation controller of the ventilation device and an air conditioning controller of the air conditioner. [Figure 6] FIG. 6 is a diagram showing the operations performed by the ventilation control section of the ventilation device, where (A) shows a first automatic selection operation and (B) shows a second automatic selection operation. [Figure 7] FIG. 7 is a timing chart showing changes in the operation of the ventilator accompanying the start and end of the heating mode of the air conditioner. [Figure 8] FIG. 8 is a timing chart showing changes in the operation of the ventilator accompanying the start and end of the cooling mode or dehumidification mode of the air conditioner. [Figure 9] FIG. 9 is a schematic perspective view of a typical fin-and-tube air heat exchanger. [Figure 10] FIG. 10 is a schematic side view of a typical fin-and-tube air heat exchanger. [Figure 11] FIG. 11 is a timing chart showing changes in the operation of the ventilator accompanying the start and end of the heating mode of the air conditioner in the first modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] An air conditioning system (50) of the embodiment will be described.

[0026] -Air conditioning systems and housing- As shown in Fig. 1, an air conditioning system (50) of this embodiment is installed in a house (1). The air conditioning system (50) includes four air conditioners (200a-200d) and two ventilators (10a, 10b). Note that the numbers of the air conditioners (200a-200d) and the ventilators (10a, 10b) are merely examples.

[0027] In a house (1) in which an air conditioning system (50) is installed, occupant rooms (2a-2d) such as a living room and private rooms, and non-occupant rooms (3a, 3b) such as a hallway and a toilet are formed on each of the first and second floors. These occupant rooms (2a-2d) and non-occupant rooms (3a, 3b) form an indoor space (5). In addition, in the house, an attic space (8) is formed above a ceiling panel (7) on each of the first and second floors.

[0028] -Air conditioning system configuration- As shown in FIG. 2, each of the air conditioners (200a-200d) includes one outdoor unit (211a-211d) and one indoor unit (212a-212d). The first air conditioner (200a) includes a first outdoor unit (211a) and a first indoor unit (212a). The second air conditioner (200b) includes a second outdoor unit (211b) and a second indoor unit (212b). The third air conditioner (200c) includes a third outdoor unit (211c) and a third indoor unit (212c). The fourth air conditioner (200d) includes a fourth outdoor unit (211d) and a fourth indoor unit (212d).

[0029] As shown in Fig. 1, the indoor units (212a-212d) of each air conditioner (200a-200d) are installed in different rooms (2a-2d). Specifically, the first indoor unit (212a) is installed in the first room (2a), the second indoor unit (212b) in the second room (2b), the third indoor unit (212c) in the third room (2c), and the fourth indoor unit (212d) in the fourth room (2d). Each of the indoor units (212a-212d) in this embodiment is a wall-mounted indoor unit.

[0030] The outdoor units (211a to 211d) of the air conditioners (200a to 200d) are installed in the outdoor space (6). In FIG. 1, the outdoor units (211a to 211d) are not shown.

[0031] <Outdoor unit> 2, each of the outdoor units (211a to 211d) includes a compressor (221), a switching mechanism (222), an outdoor heat exchanger (223), and an expansion valve (224). Each of the outdoor units (211a to 211d) also includes an outdoor fan (215) and an air conditioning controller (250).

[0032] The outdoor heat exchanger (223) is a fin-and-tube air heat exchanger. The outdoor heat exchanger (223) exchanges heat between a refrigerant, which is a heat medium, and outdoor air. The switching mechanism (222) is a four-way switching valve having four ports. The switching mechanism (222) switches between a first state (a state shown by a solid line in FIG. 2) in which the first port communicates with the third port and the second port communicates with the fourth port, and a second state (a state shown by a dashed line in FIG. 2) in which the first port communicates with the fourth port and the second port communicates with the third port.

[0033] <Indoor unit> Each of the indoor units (212a to 212d) includes an indoor heat exchanger (225) and an indoor fan (216). Each of the indoor units (212a to 212d) also includes an indoor temperature sensor (255) and a heat exchanger temperature sensor (256).

[0034] The indoor heat exchanger (225) is a third heat exchanger that exchanges heat between the refrigerant, which is a heat medium, and the indoor air. The indoor heat exchanger (225) is a fin-and-tube air heat exchanger. The indoor temperature sensor (255) measures the temperature of the indoor air before it passes through the indoor heat exchanger (225). The heat exchanger temperature sensor (256) is attached to a heat transfer tube that constitutes the indoor heat exchanger (225), and measures the evaporation temperature and condensation temperature of the refrigerant in the indoor heat exchanger (225).

[0035] <Refrigerant circuit> In each of the air conditioners (200a-200d), the outdoor units (211a-211d) and the indoor units (212a-212d) are connected by a liquid side connecting pipe (226) and a gas side connecting pipe (227). In each of the air conditioners (200a-200d), a refrigerant circuit (220) is formed by the outdoor units (211a-211d), the indoor units (212a-212d), the liquid side connecting pipe (226), and the gas side connecting pipe (227).

[0036] In the refrigerant circuit (220), a discharge pipe of the compressor (221) is connected to a first port of a switching mechanism (222), and a suction pipe of the compressor (221) is connected to a second port of the switching mechanism (222). A third port of the switching mechanism (222) is connected to a gas side end of the outdoor heat exchanger (223). A fourth port of the switching mechanism (222) is connected to a gas side end of the indoor heat exchanger (225) via a gas side connecting pipe (227). A liquid side end of the outdoor heat exchanger (223) is connected to one end of an expansion valve (224). The other end of the expansion valve (224) is connected to a liquid side end of the indoor heat exchanger (225) via a liquid side connecting pipe (226).

[0037] Air conditioning controller Each of the air conditioners (200a to 200d) includes an air conditioning controller (250). In each of the air conditioners (200a to 200d), the air conditioning controller (250) is accommodated in the outdoor unit (211a to 211d).

[0038] 5, the air conditioning controller (250) includes a microcomputer (250a) mounted on a control board, and a memory device (250b) that stores software for operating the microcomputer (250a). The memory device (250b) is a semiconductor memory. Measurement values ​​of an indoor temperature sensor (255) and a heat exchanger temperature sensor (256) are input to the air conditioning controller (250).

[0039] The air conditioning controller (250) controls components of the air conditioners (200a-200d). For example, the air conditioning controller (250) controls the operation frequency of the compressor (221) so that the measurement value of the room temperature sensor (255) is maintained at a set temperature. The air conditioning controller (250) also operates the switching mechanism (222) in accordance with an operation mode designated by the user.

[0040] -Air conditioning unit operation- Each of the air conditioners (200a to 200d) is capable of operating in a plurality of operation modes. Specifically, each of the air conditioners (200a to 200d) is capable of operating in a cooling mode, a dehumidification mode, a heating mode, and a fan mode.

[0041] <Cooling mode, dehumidification mode> The cooling mode and the dehumidification mode are indoor air cooling modes in which the indoor air is cooled in the indoor heat exchanger (225).

[0042] In each of the cooling mode and the dehumidification mode, the switching mechanism (222) is in the first state, the compressor (221) is operated, and the refrigerant circulates through the refrigerant circuit (220). In addition, the outdoor fan (215) and the indoor fan (216) are operated. A refrigeration cycle is performed in the refrigerant circuit (220), and the outdoor heat exchanger (223) functions as a condenser and the indoor heat exchanger (225) functions as an evaporator.

[0043] In the indoor heat exchanger (225) functioning as an evaporator, the indoor air is cooled, lowering the temperature of the indoor air. In addition, in the indoor heat exchanger (225), moisture contained in the indoor air is condensed, lowering the absolute humidity of the indoor air. Each of the indoor units (212a-212d) blows the indoor air cooled in the indoor heat exchanger (225) into the corresponding room (2a-2d).

[0044] <Heating mode> The heating mode is an indoor air heating mode in which indoor air is heated in the indoor heat exchanger (225).

[0045] In the heating mode, the switching mechanism (222) is in the second state, the compressor (221) is operated, and the refrigerant circulates through the refrigerant circuit (220). In addition, the outdoor fan (215) and the indoor fan (216) are operated. A refrigeration cycle is performed in the refrigerant circuit (220), in which the indoor heat exchanger (225) functions as a condenser and the outdoor heat exchanger (223) functions as an evaporator.

[0046] In the indoor heat exchanger (225) functioning as a condenser, the indoor air is heated, and the temperature of the indoor air increases. Each of the indoor units (212a-212d) blows the indoor air heated in the indoor heat exchanger (225) into the corresponding room (2a-2d).

[0047] <Blower mode> The fan mode is an operation mode in which the indoor units (212a to 212d) only blow air into the rooms (2a to 2d).

[0048] In the fan mode, the compressor (221) and the outdoor fan (215) are stopped, and the indoor fan (216) is operated. In the fan mode, the indoor heat exchanger (225) stops cooling and heating the indoor air. The indoor units (212a-212d) return the sucked indoor air directly to the living rooms (2a-2d).

[0049] -Ventilation system configuration- 3, each of the ventilation devices (10a, 10b) includes one ventilation unit (11a, 11b) and one 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).

[0050] As shown in Fig. 1, the first ventilation unit (11a) is installed in an attic space (8) on the first floor of the house (1), and the second ventilation unit (11b) is installed in an attic space (8) on the second floor of the house (1). In Fig. 1, the heat source units (80a, 80b) are not shown.

[0051] An outdoor air duct (D1), an exhaust duct (D2), and an air supply duct (D3) are connected to each ventilation unit (11a, 11b). The outdoor air duct (D1) has an inflow end that opens into the outdoor space (6) and an outflow end that connects to the corresponding ventilation unit (11a, 11b). The exhaust duct (D2) has an inflow end that connects to the corresponding ventilation unit (11a, 11b) and an outflow end that opens into the outdoor space (6). The air supply duct (D3) has an inflow end that connects to the corresponding ventilation unit (11a, 11b).

[0052] Four air supply units (30a-30d) are provided on the ceiling panel (7) of the house (1). Note that the number of air supply units (30a-30d) shown here is merely an example.

[0053] The first air supply unit (30a) and the second air supply unit (30b) are connected to the first ventilation unit (11a) via an air supply duct (D3). The first air supply unit (30a) blows the air supplied from the first ventilation unit (11a) into the first living room (2a). The second air supply unit (30b) blows the air supplied from the first ventilation unit (11a) into the second living room (2b).

[0054] The third air supply unit (30c) and the fourth air supply unit (30d) are connected to the second ventilation unit (11b) via an air supply duct (D3). The third air supply unit (30c) blows the air supplied from the second ventilation unit (11b) into the third living room (2c). The fourth air supply unit (30d) blows the air supplied from the second ventilation unit (11b) into the fourth living room (2d).

[0055] <Heat source unit> 3, each of the heat source units (80a, 80b) includes a compressor (82), a switching mechanism (84), a heat-source-side heat exchanger (83), and an expansion valve (85). Each of the heat source units (80a, 80b) also includes a heat-source-side fan (81) and a ventilation controller (100).

[0056] The heat source side heat exchanger (83) is a fin-and-tube air heat exchanger. The heat source side heat exchanger (83) exchanges heat between a refrigerant, which is a heat medium, and outdoor air. The switching mechanism (84) is a four-way switching valve having four ports. The switching mechanism (84) switches between a first state (a state shown by a solid line in FIG. 3 ) in which the first port communicates with the third port and the second port communicates with the fourth port, and a second state (a state shown by a dashed line in FIG. 3 ) in which the first port communicates with the fourth port and the second port communicates with the third port.

[0057] <Ventilation unit> Each of the ventilation units (11a, 11b) includes a total heat exchanger (21) and a utilization-side heat exchanger (25), and ventilates the indoor space (5). Each of the ventilation units (11a, 11b) also includes a temperature / humidity sensor (105) and a heat exchanger temperature sensor (106). The detailed structure of each of the ventilation units (11a, 11b) will be described later.

[0058] <Refrigerant circuit> In each ventilation device (10a, 10b), the heat source unit (80a, 80b) and the ventilation unit (11a, 11b) are connected by a liquid side connecting pipe (87) and a gas side connecting pipe (86). In each ventilation device (10a, 10b), a refrigerant circuit (R) is formed by the heat source unit (80a, 80b), the ventilation unit (11a, 11b), the liquid side connecting pipe (87), and the gas side connecting pipe (86).

[0059] In the refrigerant circuit (R), a discharge pipe of the compressor (82) is connected to a first port of a switching mechanism (84), and a suction pipe of the compressor (82) is connected to a second port of the switching mechanism (84). A third port of the switching mechanism (84) is connected to a gas side end of the heat source side heat exchanger (83). A fourth port of the switching mechanism (84) is connected to a gas side end of the utilization side heat exchanger (25) via a gas side connecting pipe (86). A liquid side end of the heat source side heat exchanger (83) is connected to one end of an expansion valve (85). The other end of the expansion valve (85) is connected to a liquid side end of the utilization side heat exchanger (25) via a liquid side connecting pipe (87).

[0060] <Ventilation Controller> Each of the ventilation devices (10a, 10b) includes a ventilation controller (100). In each of the ventilation devices (10a, 10b), the ventilation controller (100) is housed in the heat source unit (80a, 80b). The ventilation controller (100) may be housed in the ventilation unit (11a, 11b).

[0061] As shown in Fig. 5, the ventilation controller (100) includes a microcomputer (100a) mounted on a control board, and a memory device (100b) for storing software for operating the microcomputer (100a). The memory device (100b) is a semiconductor memory. Measurement values ​​of a temperature and humidity sensor (105) and a heat exchanger temperature sensor (106) are input to the ventilation controller (100).

[0062] The ventilation controller (100) controls the components of the ventilation device (10a, 10b). For example, the ventilation controller (100) controls the operation of the compressor (82) based on measurements of the temperature and humidity sensor (105). The ventilation controller (100) can also perform a first automatic control operation and a second automatic control operation. The operation of the ventilation controller (100) will be described in detail later.

[0063] The ventilation controller (100) of each ventilation device (10a, 10b) is capable of communicating with the air conditioning controller (250) of the corresponding air conditioner (200a-200d). The ventilation controller (100) of each ventilation device (10a, 10b) receives operation information related to the operation state of the corresponding air conditioner (200a-200d) from the air conditioning controller (250) of the corresponding air conditioner (200a-200d). The ventilation controller (100) is a controller that changes the operation of the ventilation device (10a, 10b) based on the received operation information.

[0064] -Ventilation unit configuration- As shown in Fig. 4, each ventilation unit (11a, 11b) has a casing (12). An air supply passage (13) and an exhaust passage (14) are formed in the casing (12) of each ventilation unit (11a, 11b). Also, the casing (12) of each ventilation unit (11a, 11b) accommodates an air supply fan (22), an exhaust fan (23), a total heat exchanger (21), and a utilization side heat exchanger (25).

[0065] <Casing> As shown in Fig. 3, the casing (12) is formed in a rectangular parallelepiped shape. The casing (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 face each other.

[0066] The upper plate (12a) forms an upper surface of the casing (12). The lower plate (12b) forms a lower surface of the casing (12). The first side plate (12c) forms a side surface at one longitudinal end of the casing (12). The second side plate (12d) forms a side surface at the other longitudinal end of the casing (12).

[0067] The first side plate (12c) is provided with a first duct connection part (C1) and a second duct connection part (C2). The first duct connection part (C1) and the second duct connection part (C2) are formed in a cylindrical shape. The first duct connection part (C1) and the second duct connection part (C2) protrude laterally from the outer surface of the first side plate (12c). The first duct connection part (C1) is connected to the outflow end of the outside air duct (D1). The second duct connection part (C2) is connected to the inflow end of the exhaust duct (D2).

[0068] The second side plate (12d) is provided with a third duct connection portion (C3). The third duct connection portion (C3) is formed in a cylindrical shape. The third duct connection portion (C3) protrudes laterally from the outer surface of the second side plate (12d). The inlet end of the air supply duct (D3) is connected to the third duct connection portion (C3).

[0069] An indoor panel (15) is provided on the lower plate (12b) of the casing (12). As shown in FIG. 1, the indoor panel (15) is provided inside a ventilation opening (7a) penetrating the ceiling panel (7). The indoor panel (15) faces the indoor space (5). An intake port (15a) is formed in the indoor panel (15). The intake port (15a) formed in the casing (12) of the first ventilation unit (11a) connects the inlet end of the exhaust passage (14) to the unoccupied room (3a) on the first floor. The intake port (15a) formed in the casing (12) of the second ventilation unit (11b) connects the inlet end of the exhaust passage (14) to the unoccupied room (3b) on the second floor.

[0070] <Partition> As shown in FIG. 4, a first partition plate (16) and a second partition plate (17) are provided inside the casing (12). The first partition plate (16) divides a 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) communicates with the first duct connection portion (C1). The first flow path (P1) constitutes a flow path of the air supply path (13) upstream of the total heat exchanger (21). The second flow path (P2) communicates with the second duct connection portion (C2). The second flow path (P2) constitutes a flow path of the exhaust path (14) downstream of the total heat exchanger (21).

[0071] The second partition plate (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) communicates with the third duct connection portion (C3). The third flow path (P3) constitutes a flow path of the air supply path (13) downstream of the total heat exchanger (21). The fourth flow path (P4) is connected to the inlet (15a) of the indoor panel (15). The fourth flow path (P4) constitutes a flow path of the exhaust path (14) upstream of the total heat exchanger (21).

[0072] <Total heat exchanger> The total heat exchanger (21) is a first heat exchanger that exchanges heat between the outdoor air supplied to the room and the indoor air discharged to the outside.

[0073] The total heat exchanger (21) is a cross-flow type heat exchanger. The total heat exchanger (21) exchanges heat between air flowing through the air supply passage (13) and air flowing through the exhaust passage (14). An air supply side internal flow path (21a) and an exhaust side internal flow path (21b) are formed inside the total heat exchanger (21). The air supply side internal flow path (21a) and the exhaust side internal flow path (21b) extend in directions perpendicular to each other.

[0074] An inlet of the intake side internal flow path (21a) is connected to the first flow path (P1). An outlet of the intake side internal flow path (21a) is connected to the third flow path (P3). An inlet of the exhaust side internal flow path (21b) is connected to the fourth flow path (P4). An outlet of the exhaust side internal flow path (21b) is connected to the second flow path (P2).

[0075] The total heat exchanger (21) transfers heat between the air in the intake side internal flow path (21a) and the air in the exhaust side internal flow path (21b). The total heat exchanger (21) transfers moisture between the air in the intake side internal flow path (21a) and the air in the exhaust side internal flow path (21b). In this manner, the total heat exchanger (21) exchanges both sensible heat and latent heat between the air in the intake side internal flow path (21a) and the air in the exhaust side internal flow path (21b).

[0076] <Intake and exhaust fans> The intake fan (22) is disposed in the second flow path (P2). The exhaust fan (23) is disposed in the third flow path (P3). The intake fan (22) transports air in the intake path (13). The exhaust fan (23) transports air in the exhaust path (14). The intake fan (22) and the exhaust fan (23) are of a sirocco type. The intake fan (22) and the exhaust fan (23) may be of a turbo type or a propeller type.

[0077] <filter> The ventilation unit (11a, 11b) includes a filter (24). The filter (24) is disposed in the first flow path (P1). In other words, the filter (24) is disposed upstream of the total heat exchanger (21) in the air supply path (13). The filter (24) collects dust in the outdoor air (OA).

[0078] <Used heat exchanger> The utilization side heat exchanger (25) is a second heat exchanger that exchanges heat between the outdoor air that has passed through the total heat exchanger (21) and a refrigerant that is a heat medium. The utilization side heat exchanger (25) is a fin-and-tube type air heat exchanger.

[0079] The utilization side heat exchanger (25) is disposed in the third flow path (P3). The utilization side heat exchanger (25) is disposed downstream of the total heat exchanger (21) in the air supply passage (13). The utilization side heat exchanger (25) is disposed in the third flow path (P3) between the air supply side internal flow path (21a) and the air supply fan (22).

[0080] Sensors As described above, each ventilation unit (11a, 11b) is provided with the temperature / humidity sensor (105) and the heat exchanger temperature sensor (106).

[0081] 4, the temperature and humidity sensor (105) is provided 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) passing through the total heat exchanger (21) and proceeding toward the utilization side heat exchanger (25). Each ventilation unit (11a, 11b) may be provided with a temperature sensor that measures only the air temperature and a humidity sensor that measures only the relative humidity of the air, instead of the temperature and humidity sensor (105).

[0082] The heat exchanger temperature sensor (106) is attached to a heat transfer tube constituting the utilization side heat exchanger (25) and measures the evaporation temperature and condensation temperature of the refrigerant in the utilization side heat exchanger (25).

[0083] -Ventilation system operation- Each of the ventilation devices (10a, 10b) is capable of operating in a plurality of operation modes, specifically, each of the ventilation devices (10a, 10b) is capable of operating in a cooling ventilation mode, a heating ventilation mode, and a simple ventilation mode.

[0084] <Cooling ventilation mode> The cooling ventilation mode is an outdoor air cooling mode in which the outdoor air is cooled in the utilization side heat exchanger (25).

[0085] In the cooling ventilation mode, the switching mechanism (84) is in the first state, the compressor (82) is operated, and the refrigerant circulates through the refrigerant circuit (R). In the cooling ventilation mode, the compressor (82) operates at a constant rotation speed. In the refrigerant circuit (R), a refrigeration cycle is performed, in which the heat-source side heat exchanger (83) functions as a condenser and the utilization side heat exchanger (25) functions as an evaporator. In addition, in the cooling ventilation mode, the supply air fan (22) and the exhaust fan (23) are operated.

[0086] In the ventilation units (11a, 11b), outside air passes through the outside air duct (D1) and flows into the first flow path (P1), and room air passes through the inlet (15a) and flows into the fourth flow path (P4).

[0087] In the total heat exchanger (21), the outdoor air flowing in through the first flow path (P1) exchanges heat with the indoor air flowing in through the fourth flow path (P4). When the indoor space (5) is air-conditioned in summer, the temperature and humidity of the indoor air are usually lower than the temperature and humidity of the outdoor air, respectively. Therefore, in the total heat exchanger (21), both heat and moisture (sensible heat and latent heat) are transferred from the outdoor air to the indoor air.

[0088] The outdoor air that has passed through the total heat exchanger (21) is sent to 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).

[0089] In the utilization side heat exchanger (25) functioning as an evaporator, the outdoor air that has passed through the total heat exchanger (21) is cooled, and the temperature of the outdoor air is reduced. In addition, in the utilization side heat exchanger (25), moisture contained in the outdoor air is condensed, and the absolute humidity of the outdoor air is reduced. The ventilation units (11a, 11b) supply the outdoor air cooled in the utilization side heat exchanger (25) to the living rooms (2a-2d) through the supply air duct (D3).

[0090] <Heating ventilation mode> The heating ventilation mode is an outdoor air heating mode in which the outdoor air is heated in the utilization side heat exchanger (25).

[0091] In the heating ventilation mode, the switching mechanism (84) is in the second state, the compressor (82) is operated, and the refrigerant circulates through the refrigerant circuit (R). In the heating ventilation mode, the compressor (82) operates at a constant rotation speed. In the refrigerant circuit (R), a refrigeration cycle is performed, in which the utilization side heat exchanger (25) functions as a condenser, and the heat source side heat exchanger (83) functions as an evaporator. In addition, in the heating ventilation mode, the supply air fan (22) and the exhaust fan (23) operate.

[0092] In the ventilation units (11a, 11b), outside air passes through the outside air duct (D1) and flows into the first flow path (P1), and room air passes through the inlet (15a) and flows into the fourth flow path (P4).

[0093] In the total heat exchanger (21), the outdoor air flowing in through the first flow path (P1) exchanges heat with the indoor air flowing in through the fourth flow path (P4). When the indoor space (5) is air-conditioned in winter, the temperature and humidity of the indoor air are usually higher than the temperature and humidity of the outdoor air, respectively. Therefore, in the total heat exchanger (21), both heat and moisture (sensible heat and latent heat) are transferred from the indoor air to the outdoor air.

[0094] The outdoor air that has passed through the total heat exchanger (21) is sent to 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).

[0095] In the utilization side heat exchanger (25) functioning as a condenser, the outdoor air that has passed through the total heat exchanger (21) is heated, and the temperature of the outdoor air increases. The ventilation units (11a, 11b) supply the outdoor air heated in the utilization side heat exchanger (25) to the living rooms (2a-2d) through the supply air duct (D3).

[0096] <Simple ventilation mode> The simple ventilation mode is a mode in which ventilation is performed without cooling or heating the outdoor air in the utilization side heat exchanger (25).

[0097] In the simple ventilation mode, the compressor (82) is stopped, and the supply fan (22) and the exhaust fan (23) are operated. No refrigeration cycle is performed in the refrigerant circuit (R).

[0098] In the ventilation units (11a, 11b), outdoor air flows into the first flow path (P1) through the outside air duct (D1), and indoor air flows into the fourth flow path (P4) through the inlet (15a). In the total heat exchanger (21), the outdoor air flowing in from the first flow path (P1) exchanges heat with the indoor air flowing in from the fourth flow path (P4). The outdoor air that has passed through the total heat exchanger (21) passes through the utilization side heat exchanger (25), and is then supplied to the living rooms (2a to 2d) through the supply air duct (D3). On the other hand, the indoor air that has passed through the total heat exchanger (21) is discharged into the exhaust duct (D2) through the second flow path (P2).

[0099] -Ventilation controller operation- As described above, the ventilation controller (100) is capable of executing the first automatic selection operation and the second automatic selection operation. Each of the first automatic selection operation and the second automatic selection operation is a control operation for automatically selecting an operation mode to be performed by the ventilation device (10a, 10b) based on a measurement value of the temperature and humidity sensor (105).

[0100] The ventilation controller (100) executes either the first automatic selection operation or the second automatic selection operation, whichever is designated by the user. As will be described later, the ventilation controller (100) switches between the first automatic selection operation and the second automatic selection operation based on operation information received from the air conditioning controller (250) of the corresponding air conditioner (200a, 200c).

[0101] <First automatic selection operation> The first automatic selection operation of the ventilation controller (100) will be described with reference to FIG. 6(A).

[0102] The ventilation controller (100) acquires the temperature T and relative humidity H, which are measured by the temperature and humidity sensor (105). The temperature T and relative humidity H are the temperature and relative humidity, respectively, of the outdoor air passing through the total heat exchanger (21) and proceeding toward the utilization side heat exchanger (25). The ventilation controller (100) calculates the absolute humidity X based on the acquired temperature T and relative humidity H.

[0103] In the first automatic selection operation, the ventilation controller (100) compares the temperature T with a first upper reference temperature T_U1 and a first lower reference temperature T_L1, and compares the absolute humidity X with a first reference absolute humidity X1.

[0104] In this embodiment, the first upper reference temperature T_U1 is 26°C, and the first lower reference temperature T_L1 is 18°C. The first reference absolute humidity X1 is the absolute humidity of humid air whose temperature is the first upper reference temperature T_U1 and whose relative humidity is the first reference relative humidity H1. The first reference relative humidity H1 is 55%. Note that these specific values ​​are merely examples.

[0105] When the temperature T is higher than the first upper reference temperature T_U1, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the cooling ventilation mode. When the temperature T is equal to or higher than the first lower reference temperature T_L1 and equal to or 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 device (10a, 10b) to execute the cooling ventilation mode. When the temperature T is equal to or higher than the first lower reference temperature T_L1 and equal to or lower than the first upper reference temperature T_U1, and the absolute humidity X is equal to or lower than the first reference absolute humidity X1, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the simple ventilation mode. When the temperature T is lower than the first lower reference temperature T_L1, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the heating ventilation mode.

[0106] <Second automatic selection operation> The second automatic selection operation of the ventilation controller (100) will now be described with reference to FIG. 6(B).

[0107] In the second automatic selection operation, the ventilation controller (100), like the first automatic selection operation, acquires the temperature T and the relative humidity H, which are measured by the temperature and humidity sensor (105), and calculates the absolute humidity X based on the acquired temperature T and relative humidity H.

[0108] In the second automatic selection operation, 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.

[0109] In this embodiment, the second upper reference temperature T_U2 is 30°C, and the second lower reference temperature T_L2 is 10°C. The second reference absolute humidity X2 is the absolute humidity of humid air whose temperature is the second upper reference temperature T_U2 and whose relative humidity is the second reference relative humidity H2. The second reference relative humidity H2 is 65%. Note that these specific numerical values ​​are all 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.

[0110] When the temperature T is higher than the second upper reference temperature T_U2, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the cooling ventilation mode. When the temperature T is equal to or higher than the second lower reference temperature T_L2 and equal to or 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 device (10a, 10b) to execute the cooling ventilation mode. When the temperature T is equal to or higher than the second lower reference temperature T_L2 and equal to or lower than the second upper reference temperature T_U2, and the absolute humidity X is equal to or lower than the second reference absolute humidity X2, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the simple ventilation mode. When the temperature T is lower than the second lower reference temperature T_L2, the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the heating ventilation mode.

[0111] 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, the second automatic selection operation has a wider temperature and humidity range for which the ventilation controller (100) causes the ventilation device (10a, 10b) to execute the simple ventilation mode than the first automatic selection operation. Therefore, when comparing the case where the change over time of the air temperature in the outdoor space (6) is the same, the time during which the ventilation device (10a, 10b) executes the simple ventilation mode (i.e., the time during which the compressor (82) is stopped) is longer during the second automatic selection operation than during the first automatic selection operation. Therefore, the second automatic selection operation is a control operation that can reduce the energy consumption of the ventilation device (10a, 10b) than the first automatic selection operation.

[0112] - Cooperation between ventilation equipment and air conditioning equipment - In the air conditioning system (50) of the present embodiment, each ventilation device (10a, 10b) is associated with one air conditioner (200a-200d). Each ventilation device (10a, 10b) cooperates with the corresponding one air conditioner (200a-200d).

[0113] <Coordination between the first ventilation unit and the air conditioning unit> The first ventilation device (10a) installed on the first floor of the house (1) is associated with one of the first air conditioning device (200a) and the second air conditioning device (200b) that air-condition the living rooms (2a, 2b) on the first floor. In the air conditioning system (50) of the present embodiment, the first ventilation device (10a) is associated with the first air conditioning device (200a) and cooperates with the first air conditioning device (200a).

[0114] In the air conditioning system (50) of the present embodiment, the ventilation controller (100) of the first ventilation device (10a) is capable of communicating with the air conditioning controller (250) of the first air conditioning device (200a) (see FIG. 5). The ventilation controller (100) of the first ventilation device (10a) receives operation information output by the air conditioning controller (250) of the first air conditioning device (200a). The operation information output by the air conditioning controller (250) of the first air conditioning apparatus (200a) includes information indicating that the first air conditioning apparatus (200a) has started each of the cooling mode, the dehumidification mode, and the heating mode, and information indicating that the first air conditioning apparatus (200a) has ended each of the cooling mode, the dehumidification mode, and the heating mode.

[0115] The ventilation controller (100) of the first ventilation device (10a) executes the second automatic selection operation when it receives, as operation information, “information indicating that the first air conditioning device (200a) has started the heating mode”. Moreover, the ventilation controller (100) of the first ventilation device (10a) executes the first automatic selection operation when it receives, as operation information, “information indicating that the first air conditioning device (200a) has started the cooling mode” or “information indicating that the first air conditioning device (200a) has started the dehumidification mode”.

[0116] <Coordination between the second ventilation unit and the air conditioning unit> The second ventilation device (10b) installed on the second floor of the house (1) is associated with one of the third air conditioner (200c) and the fourth air conditioner (200d) that air-condition the living rooms (2c, 2d) on the second floor. In the air conditioning system (50) of the present embodiment, the second ventilation device (10b) is associated with the third air conditioner (200c) and cooperates with the third air conditioner (200c).

[0117] In the air conditioning system (50) of the present embodiment, the ventilation controller (100) of the second ventilation device (10b) is capable of communicating with the air conditioning controller (250) of the third air conditioning device (200c) (see FIG. 5). The ventilation controller (100) of the second ventilation device (10b) receives operation information output by the air conditioning controller (250) of the third air conditioning device (200c).

[0118] The operation information output by the air conditioning controller (250) of the third air conditioner (200c) includes information indicating that the third air conditioner (200c) has started each of the cooling mode, the dehumidification mode, and the heating mode, and information indicating that the third air conditioner (200c) has ended each of the cooling mode, the dehumidification mode, and the heating mode.

[0119] The ventilation controller (100) of the second ventilation device (10b) executes the second automatic selection operation when it receives, as operation information, “information indicating that the third air conditioning device (200c) has started the heating mode”. Moreover, the ventilation controller (100) of the second ventilation device (10b) executes the first automatic selection operation when it receives, as operation information, “information indicating that the third air conditioning device (200c) has started the cooling mode” or “information indicating that the third air conditioning device (200c) has started the dehumidification mode”.

[0120] <Coordination regarding heating modes of air conditioners> Cooperation between the ventilation devices (10a, 10b) and the air conditioners (200a, 200c) regarding the heating modes of the air conditioners (200a, 200c) will be described in detail. Here, cooperation between the first ventilation device (10a) and the first air conditioner (200a) will be described, but cooperation between the second ventilation device (10b) and the third air conditioner (200c) is also similar.

[0121] The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs, as operation information, “information indicating that the first air conditioning apparatus (200a) has started the heating mode” when the first air conditioning apparatus (200a) is started and starts the heating mode, and when the operation mode executed by the first air conditioning apparatus (200a) is switched from a mode other than the heating mode (e.g., a fan mode) to the heating mode.

[0122] The ventilation controller (100) of the first ventilation device (10a) performs the second automatic selection operation when it receives "information indicating that the first air conditioning device (200a) has started the heating mode" as operation information. If the ventilation controller (100) is performing an operation other than the second automatic selection operation at the time when this operation information is received, the ventilation controller (100) switches the operation to be performed 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 when this operation information is received, the ventilation controller (100) continues to perform the second automatic selection operation.

[0123] When the ventilation controller (100) of the first ventilation device (10a) receives “information indicating that the first air conditioning device (200a) has ended the heating mode” as operation information, it performs the same operation as the operation performed immediately before the first air conditioning device (200a) started the heating mode. If the operation performed immediately before the first air conditioning device (200a) started the heating mode is different from the second automatic selection operation, the ventilation controller (100) ends the second automatic selection operation and starts the operation performed immediately before the first air conditioning device (200a) started the heating mode. On the other hand, if the second automatic selection operation was also performed immediately before the first air conditioning device (200a) started the heating mode, the ventilation controller (100) continues to perform the second automatic selection operation.

[0124] A specific example of cooperation between the ventilator devices (10a, 10b) and the air conditioners (200a, 200c) regarding the heating mode of the air conditioners (200a, 200c) will be described with reference to FIG.

[0125] 7, before time t1, the first air conditioning device (200a) is stopped, and the ventilation controller (100) of the first ventilation device (10a) is executing the first automatic selection operation. 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) executing the first automatic selection operation causes the first ventilation device (10a) to execute the heating ventilation mode.

[0126] At time t1, when a resident of the house (1) starts the first air conditioning apparatus (200a) and instructs it to start the heating mode, the first air conditioning apparatus (200a) starts the heating mode. The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs operation information indicating that the first air conditioning apparatus (200a) has started the heating mode. On receiving this operation information, the ventilation controller (100) of the first ventilation apparatus (10a) ends the first automatic selection operation and starts the second automatic selection operation.

[0127] 7, 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 operation mode performed by 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) in response to the start of the second automatic selection operation.

[0128] At time t2, when the resident of the house (1) stops the first air conditioning apparatus (200a), the first air conditioning apparatus (200a) ends the heating mode. The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs operation information indicating that the first air conditioning apparatus (200a) has ended the heating mode. Upon receiving this operation information, the ventilation controller (100) of the first ventilation apparatus (10a) ends the second automatic selection operation and starts the first automatic selection operation.

[0129] At time t2 in the example shown in Fig. 7, 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 started the first automatic selection operation, changes the operation mode performed by the first ventilation device (10a) from the simple ventilation mode to the heating ventilation mode. In this way, upon receiving operation information indicating that the first air conditioning device (200a) has ended the heating mode, the ventilation controller (100) returns the operation mode performed by the first ventilation device (10a) to the heating ventilation mode that was performed by the first ventilation device (10a) before time t1.

[0130] <Coordination of cooling and dehumidifying modes of air conditioners> Cooperation between the ventilation devices (10a, 10b) and the air conditioners (200a, 200c) regarding the cooling mode and dehumidification mode of the air conditioners (200a, 200c) will be described in detail. Here, cooperation between the first ventilation device (10a) and the first air conditioner (200a) will be described, but cooperation between the second ventilation device (10b) and the third air conditioner (200c) is also similar.

[0131] The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs, as operation information, “information indicating that the first air conditioning apparatus (200a) has started the cooling mode” or “information indicating that the first air conditioning apparatus (200a) has started the dehumidification mode” when the first air conditioning apparatus (200a) is started and starts the cooling mode or the dehumidification mode, and when the operation mode executed by the first air conditioning apparatus (200a) is switched from a mode other than the cooling mode or the dehumidification mode (e.g., the blowing mode) to the cooling mode or the dehumidification mode.

[0132] The ventilation controller (100) of the first ventilation device (10a) performs the second automatic selection operation when it receives, as operation information, "information indicating that the first air conditioning device (200a) has started the cooling mode" or "information indicating that the first air conditioning device (200a) has started the dehumidification mode." If the ventilation controller (100) is performing an operation other than the first automatic selection operation at the time when it receives this operation information, the ventilation controller (100) switches the operation to be performed to the first automatic selection operation. On the other hand, if the ventilation controller (100) is performing the first automatic selection operation at the time when it receives this operation information, the ventilation controller (100) continues to perform the first automatic selection operation.

[0133] When the ventilation controller (100) of the first ventilation device (10a) receives “information indicating that the first air conditioning device (200a) has ended the cooling mode” or “information indicating that the first air conditioning device (200a) has ended the dehumidification mode” as operation information, the ventilation controller (100) performs the same operation as the operation performed immediately before the first air conditioning device (200a) started the cooling mode or the dehumidification mode. If the operation performed immediately before the first air conditioning device (200a) started the cooling mode or the dehumidification mode is different from the first automatic selection operation, the ventilation controller (100) ends the first automatic selection operation and starts the operation performed immediately before the first air conditioning device (200a) started the cooling mode or the dehumidification mode. On the other hand, if the first automatic selection operation was also performed immediately before the first air conditioning device (200a) started the cooling mode or the dehumidification mode, the ventilation controller (100) continues to perform the first automatic selection operation.

[0134] A specific example of cooperation between the ventilator (10a, 10b) and the air conditioners (200a, 200c) regarding the cooling mode and the dehumidification mode of the air conditioners (200a, 200c) will be described with reference to FIG.

[0135] 8, before time t1, the first air conditioning device (200a) is stopped, and the ventilation controller (100) of the first ventilation device (10a) is executing the second automatic selection operation. 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 equal to or lower than the second reference absolute humidity X2. Therefore, the ventilation controller (100) executing the second automatic selection operation causes the first ventilation device (10a) to execute the simple ventilation mode.

[0136] At time t1, when a resident of the house (1) starts up the first air conditioning apparatus (200a) and instructs it to start the cooling mode or the dehumidification mode, the first air conditioning apparatus (200a) starts the cooling mode or the dehumidification mode. The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs operation information indicating that the first air conditioning apparatus (200a) has started the cooling mode or operation information indicating that the first air conditioning apparatus (200a) has started the dehumidification mode. Upon receiving this operation information, the ventilation controller (100) of the first ventilation apparatus (10a) ends the second automatic selection operation and starts the first automatic selection operation.

[0137] At time t1 in the example shown in Fig. 8, 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 operation, changes the operation mode performed by 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) in response to the start of the first automatic selection operation.

[0138] At time t2, when the resident of the house (1) stops the first air conditioning apparatus (200a), the first air conditioning apparatus (200a) ends the cooling mode or the dehumidification mode. The air conditioning controller (250) of the first air conditioning apparatus (200a) outputs operation information indicating that the first air conditioning apparatus (200a) has ended the cooling mode, or operation information indicating that the first air conditioning apparatus (200a) has ended the dehumidification mode. Upon receiving this operation information, the ventilation controller (100) of the first ventilation apparatus (10a) ends the first automatic selection operation and starts the second automatic selection operation.

[0139] At time t2 in the example shown in FIG. 8, 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 equal to or lower than the second reference absolute humidity X2. Therefore, the ventilation controller (100), which has started the second automatic selection operation, changes the operation mode performed by the first ventilation device (10a) from the cooling ventilation mode to the simple ventilation mode. In this way, when the ventilation controller (100) receives operation information indicating that the first air conditioning device (200a) has ended the cooling mode or operation information indicating that the first air conditioning device (200a) has ended the dehumidification mode, the ventilation controller (100) returns the operation mode performed by the first ventilation device (10a) to the simple ventilation mode that was performed by the first ventilation device (10a) before time t1.

[0140] -Volume of indoor heat exchanger and user side heat exchanger- As described above, the indoor heat exchanger (225) of each of the air conditioners (200a-200d) and the utilization side heat exchanger (25) of each of the ventilators (10a, 10b) are fin-and-tube air heat exchangers. In the air conditioning system (50) of the present embodiment, the volume of the indoor heat exchanger (225) is larger than the volume of the utilization side heat exchanger (25).

[0141] Here, the volume of the fin-and-tube air heat exchanger (300) will be described with reference to Figures 9 and 10. Figures 9 and 10 show a typical fin-and-tube air heat exchanger (300).

[0142] This air heat exchanger (300) includes a plurality of fins (302) and a plurality of heat transfer tubes (303). Each fin (302) is formed in a plate shape. The plurality of fins (302) are arranged in a row at regular intervals from one another. The plurality of fins (302) form a fin group (301). The heat transfer tube (303) penetrates each of the fins (302) constituting the fin group (301). The heat transfer tube (303) includes a plurality of straight pipe portions (304) penetrating the fin group (301) and a plurality of curved pipe portions (305) connecting adjacent straight pipe portions (304).

[0143] The straight pipe sections (304) are arranged in the longitudinal direction (row direction) of the fins (302) and in the width direction (row direction) of the fins (302). In the air heat exchanger (300) shown in Fig. 10, eight straight pipe sections (304) are arranged in the row direction, and two straight pipe sections (304) are arranged in the row direction. Thus, the air heat exchanger (300) shown in Fig. 10 is provided with sixteen straight pipe sections (304).

[0144] The volume of the air heat exchanger (300) is the sum of the internal volumes of the straight pipe sections (304). Therefore, the volume V of the air heat exchanger (300) is calculated by the following formula.

[0145] V=A×L×N In the above 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). The effective length L of the air heat exchanger (300) is the length from one end to the other end of the fin group (301), as shown in FIG.

[0146] In the present embodiment, the indoor heat exchanger (225) has a diameter of A=18.3 mm. 2 , L = 610 mm, and N = 36. Therefore, the volume of the indoor heat exchanger (225) is V = 402 cm 3 It is.

[0147] In this embodiment, the utilization side heat exchanger (25) has a diameter of A=37.1 mm. 2, L = 330 mm, and N = 24. Therefore, the volume of the user side heat exchanger (25) is V = 294 cm 3 It is.

[0148] -Temperature of indoor heat exchanger and user side heat exchanger- The temperature of the indoor heat exchanger (225) is a measurement value of the heat exchanger temperature sensor (256). When the air conditioners (200a, 200c) are operating in the cooling mode, the measurement value of the heat exchanger temperature sensor (256) is substantially equal to the evaporation temperature of the refrigerant in the indoor heat exchanger (225).

[0149] The temperature of the utilization-side heat exchanger (25) is a value measured by the heat exchanger temperature sensor (106). When the ventilation device (10a, 10b) is in the cooling ventilation mode, the value measured by the heat exchanger temperature sensor (106) is substantially equal to the evaporation temperature of the refrigerant in the utilization-side heat exchanger (25).

[0150] As described above, in the air conditioning system (50) of the present embodiment, the first ventilation device (10a) is associated with the first air conditioning device (200a), and the second ventilation device (10b) is associated with the third air conditioning device (200c). In the air conditioning system (50) of the present embodiment, the ventilation devices (10a, 10b) may operate in the cooling ventilation mode, and at the same time, the air conditioning devices (200a, 200c) corresponding to the ventilation devices (10a, 10b) may operate in the cooling mode.

[0151] For example, the first ventilation device (10a) executing the cooling ventilation mode supplies outdoor air cooled in the utilization-side heat exchanger (25) to the first living room (2a). The first ventilation device (10a) supplies the cooled outdoor air, thereby treating part of the cooling load of the first living room (2a). As a result, the load of the cooling load of the first living room (2a) that is treated by the first air conditioning device (200a) is reduced. Therefore, the temperature of the indoor heat exchanger (225) of the first air conditioning device (200a) executing the cooling mode is usually higher than the temperature of the utilization-side heat exchanger (25) of the first ventilation device (10a) executing the cooling ventilation mode.

[0152] A specific example will be given. Suppose that the temperature of the outdoor air in the outdoor space is 28°C and the relative humidity is 80%, and the temperature of the indoor air 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 conditioner (200a) operating in the cooling mode is approximately 15°C, and the temperature of the utilization side heat exchanger (25) of the first ventilation unit (10a) operating in the cooling ventilation mode is approximately 12°C.

[0153] -Features of the embodiment (1)- In the air conditioning system (50) of the present embodiment, the ventilation controller (100) of each ventilation device (10a, 10b) changes the operation of the ventilation device (10a, 10b) depending on the operation mode executed by the corresponding air conditioning device (200a, 200c). This makes it possible to operate the ventilation devices (10a, 10b) in an appropriate state depending on the operation mode executed by the air conditioning device (200a, 200c), thereby making it possible to appropriately control the air conditioning system (50).

[0154] In particular, in the air conditioning system (50) of the present embodiment, the ventilation controller (100) of each ventilation device (10a, 10b) changes the heat exchange amount of the utilization side heat exchanger (25) in accordance with the operation mode executed by the corresponding air conditioner (200a, 200c) (see FIGS. 7 and 8). This makes it possible to appropriately adjust the state of the outdoor air supplied to the room by the ventilation devices (10a, 10b) in accordance with the operation mode executed by the air conditioner (200a, 200c).

[0155] -Features of the embodiment (2)- 7, in the air conditioning system (50) of this embodiment, when the air conditioners (200a, 200c) start a heating mode while the ventilation devices (10a, 10b) are operating in a heating ventilation mode, the ventilation controller (100) stops heating the outdoor air in the utilization side heat exchangers (25) of the ventilation devices (10a, 10b). In other words, the ventilation controller (100) reduces the amount of heating in the utilization side heat exchangers (25) of the ventilation devices (10a, 10b) to zero.

[0156] Therefore, compared to the case where the ventilation controller (100) does not change the heating amount of the utilization side heat exchanger (25) of the ventilation device (10a, 10b), the proportion of the heating load of the indoor space (5) that is processed by the indoor heat exchanger (225) of the air conditioner (200a, 200c) increases, and the proportion of the load that is processed by the utilization side heat exchanger (25) of the ventilation device (10a, 10b) decreases.

[0157] In the air conditioning system (50) of this embodiment, the volume of the indoor heat exchanger (225) of the air conditioner (200a, 200c) is larger than the volume of the utilization side heat exchanger (25) of the ventilation unit (10a, 10b). In general, the larger the volume of a heat exchanger, the higher the heat exchange capacity. Therefore, the heat exchange capacity of the indoor heat exchanger (225) of the air conditioner (200a, 200c) is larger than the heat exchange capacity of the utilization side heat exchanger (25) of the ventilation unit (10a, 10b).

[0158] Generally, the greater the heat exchange capacity of a heat exchanger provided in a refrigerant circuit, the higher the COP (coefficient of performance) of the refrigeration cycle performed in the refrigerant circuit. Therefore, in the air conditioning system (50) of the present embodiment, the COP of the refrigeration cycle performed in the refrigerant circuit (220) of the air conditioners (200a, 200c) is higher than the COP of the refrigeration cycle performed in the refrigerant circuit (R) of the ventilation devices (10a, 10b).

[0159] 7, in the air conditioning system (50) of this embodiment, when the air conditioners (200a, 200c) start the heating mode while the ventilation devices (10a, 10b) are executing the heating ventilation mode, the ventilation controller (100) stops heating the outdoor air in the utilization side heat exchanger (25) of the ventilation devices (10a, 10b). As a result, the proportion of the heating load of the indoor space (5) processed by the indoor heat exchanger (225) of the air conditioner (200a, 200c) having a relatively high COP increases, and the proportion of the heating load processed by the utilization side heat exchanger (25) of the ventilation devices (10a, 10b) having a relatively low COP decreases.

[0160] Therefore, in the air conditioning system (50) of the present embodiment, the air conditioners (200a, 200c) having a relatively high COP handle a large heating load, thereby making it possible to reduce the power consumption of the entire air conditioning system (50).

[0161] -Features of the embodiment (3)- In the specific example shown in FIG. 8, in the air conditioning system (50) of this embodiment, when the air conditioning apparatus (200a, 200c) starts the cooling mode or the dehumidification mode while the cooling of the outdoor air in the utilization side heat exchanger (25) of the ventilation apparatus (10a, 10b) is stopped, the ventilation controller (100) starts cooling the outdoor air in the utilization side heat exchanger (25).

[0162] Therefore, compared to the case where cooling of the outdoor air in the utilization side heat exchanger (25) of the ventilation unit (10a, 10b) is stopped, the proportion of the cooling load (sensible heat load and latent heat load) of the indoor space (5) processed by the indoor heat exchanger (225) of the air conditioner (200a, 200c) decreases, and the proportion of the load processed by the utilization side heat exchanger (25) of the ventilation unit (10a, 10b) increases.

[0163] Here, in a state where the indoor space (5) is air-conditioned in summer, the outdoor air in the outdoor space (6) has a higher temperature and humidity than the indoor air in the indoor space (5). Therefore, the outdoor air in the outdoor space (6) has a higher dew point than the indoor air in the indoor space (5). Therefore, in the utilization side heat exchanger (25) of the ventilation system (10a, 10b) that exchanges heat between the outdoor air and the refrigerant, the difference between the air dew point and the heat exchanger temperature is larger than in the indoor heat exchanger (225) of the air conditioner (200a, 200c) that exchanges heat between the indoor air and the refrigerant, and a larger amount of condensed water is generated.

[0164] In particular, in the air conditioning system (50) of the present embodiment, when the air conditioners (200a, 200c) are operating in a cooling mode or a dehumidification mode and the ventilation units (10a, 10b) are operating in a cooling ventilation mode, the temperature of the indoor heat exchanger (225) of the air conditioners (200a, 200c) is higher than the temperature of the utilization side heat exchanger (25) of the ventilation units (10a, 10b). Thus, the proportion of the cooling load (sensible heat load and latent heat load) of the indoor space (5) treated by the indoor heat exchanger (225) of the air conditioners (200a, 200c) becomes relatively low, and the proportion of the load treated by the utilization side heat exchanger (25) of the ventilation units (10a, 10b) becomes relatively high.

[0165] Therefore, in the air conditioning system (50) of the present embodiment, the ventilator (10a, 10b), which produces a large amount of condensed water, is made to process a large latent heat load (dehumidification load), thereby making it possible to reduce the power consumption of the entire air conditioning system (50).

[0166] -Features of the embodiment (4)- 7, in the air conditioning system (50) of the present embodiment, when the air conditioners (200a, 200c) start the heating mode while the ventilation controller (100) of the ventilation devices (10a, 10b) is executing the first automatic selection operation, the ventilation controller (100) temporarily ends the first automatic selection operation and starts the second automatic selection operation. Then, when the air conditioners (200a, 200c) thereafter end the heating mode, the ventilation controller (100) ends the second automatic selection operation and resumes the first automatic selection operation.

[0167] As a result of this operation being performed by the ventilation controller (100) of the ventilation devices (10a, 10b), in the specific example shown in Fig. 7, when the air conditioners (200a, 200c) start the heating mode, the ventilation devices (10a, 10b) end the heating ventilation mode and start the simple ventilation mode. Also, when the air conditioners (200a, 200c) end the heating mode, the ventilation devices (10a, 10b) resume the heating ventilation mode that was being performed before the air conditioners (200a, 200c) started the heating mode.

[0168] 8, in the air conditioning system (50) of the present embodiment, when the air conditioners (200a, 200c) start the cooling mode or the dehumidification mode while the ventilation controller (100) of the ventilation devices (10a, 10b) is executing the second automatic selection operation, the ventilation controller (100) temporarily ends the second automatic selection operation and starts the first automatic selection operation. Then, when the air conditioners (200a, 200c) thereafter end the cooling mode or the dehumidification mode, the ventilation controller (100) ends the first automatic selection operation and resumes the second automatic selection operation.

[0169] As a result of this operation being performed by the ventilation controller (100) of the ventilation device (10a, 10b), in the specific example shown in Fig. 8, when the air conditioner (200a, 200c) starts the cooling mode or the dehumidification mode, the ventilation device (10a, 10b) ends the simple ventilation mode and starts the cooling ventilation mode. Also, when the air conditioner (200a, 200c) ends the cooling mode or the dehumidification mode, the ventilation device (10a, 10b) resumes the simple ventilation mode that was being performed before the air conditioner (200a, 200c) started the cooling mode or the dehumidification mode.

[0170] -Features of the embodiment (5)- In the air conditioning system (50) of the present embodiment, the ventilation controller (100) of the ventilation device (10a, 10b) switches the operation mode executed by the ventilation device (10a, 10b) based on the measurement value of the temperature and humidity sensor (105). As a result, in the ventilation device (10a, 10b), the heat exchange amount of the utilization side heat exchanger (25) is changed based on the temperature and humidity of the outdoor air passing through the total heat exchanger (21) and flowing toward the utilization side heat exchanger (25).

[0171] -Modification of embodiment (1)- In the specific example shown in FIG. 7, when the ventilation device (10a, 10b) is operating in the heating ventilation mode and the corresponding air conditioner (200a, 200c) starts the heating mode, the ventilation controller (100) of each ventilation device (10a, 10b) switches the operation mode executed by the ventilation device (10a, 10b) from the heating ventilation mode to the simple ventilation mode.

[0172] When each ventilation device (10a, 10b) is configured to be able to change the rotation speed of the compressor (82), the ventilation controller (100) of each ventilation device (10a, 10b) may perform a control operation as shown in FIG. 11 instead of the above-described control operation.

[0173] 11 indicate the operating state of the compressor (82) of the ventilation system (10a, 10b). "100" indicates that the rotation speed of the compressor (82) is at its maximum. "0" indicates that the compressor (82) is stopped.

[0174] 11, the ventilation controller (100) of each ventilation device (10a, 10b) may perform a control operation to reduce the rotation speed of the compressor (82) of the ventilation device (10a, 10b) when the corresponding air conditioner (200a, 200c) starts the heating mode while the ventilation device (10a, 10b) is executing the heating ventilation mode. When the ventilation controller (100) performs this control operation, when the corresponding air conditioner (200a, 200c) starts the heating mode while the ventilation device (10a, 10b) is executing the heating ventilation mode, the amount of heating in the utilization side heat exchanger (25) of the ventilation device (10a, 10b) is reduced.

[0175] -Modification of the embodiment (2)- The air conditioning system (50) of the present embodiment may be configured to be capable of switching the air conditioners (200a-200d) with which each ventilation device (10a, 10b) cooperates. Specifically, the system may be capable of switching between a state in which the first ventilation device (10a) cooperates with the first air conditioner (200a) and a state in which the first ventilation device (10a) cooperates with the second air conditioner (200b). The air conditioning system (50) may be capable of switching between a state in which the second ventilation device (10b) cooperates with the third air conditioner (200c) and a state in which the second ventilation device (10b) cooperates with the fourth air conditioner (200d).

[0176] -Modification of embodiment (3)- The air conditioning system (50) of the present embodiment may be configured such that each ventilation device (10a, 10b) is linked to a plurality of air conditioning devices (200a to 200d). Specifically, the first ventilation device (10a) may be linked to both the first air conditioning device (200a) and the second air conditioning device (200b). Furthermore, the second ventilation device (10b) may be linked to both the third air conditioning device (200c) and the fourth air conditioning device (200d).

[0177] An example will be described in which the first ventilation device (10a) cooperates with both the first air conditioning device (200a) and the second air conditioning device (200b). If either the first air conditioning device (200a) or the second air conditioning device (200b) starts the heating mode while the ventilation controller (100) of the first ventilation device (10a) is executing the first automatic selection operation, the ventilation controller (100) of the first ventilation device (10a) ends the first automatic selection operation and starts the second automatic selection operation. Also, if either the first air conditioning device (200a) or the second air conditioning device (200b) starts the cooling mode or the dehumidification mode while the ventilation controller (100) of the first ventilation device (10a) is executing the second automatic selection operation, the ventilation controller (100) of the first ventilation device (10a) ends the second automatic selection operation and starts the first automatic selection operation.

[0178] -Modification of embodiment (4)- In the air conditioning system (50) of the present embodiment, the first indoor unit (212a) and the second indoor unit (212b) installed on the first floor of the house (1) may be connected to a single outdoor unit. Similarly, the third indoor unit (212c) and the fourth indoor unit (212d) installed on the second floor of the house (1) may be connected to a single outdoor unit.

[0179] -Modification of the embodiment (5)- In the air conditioning system (50) of the present embodiment, the ventilation controller (100) of the ventilation device (10a, 10b) changes the operation of the ventilation device (10a, 10b) depending on the operation mode executed by the corresponding air conditioner (200a, 200c).

[0180] The air conditioning system (50) of the present embodiment may include a control device that performs the operation of "changing the operation of the ventilators (10a, 10b) depending on the operation mode executed by the air conditioners (200a, 200c)" in addition to the ventilation controller (100) and the air conditioning controller (250). This control device may be provided in the house (1) in which the air conditioning system (50) is installed. In addition, this control device may be provided in a location remote from the house (1) and configured to communicate with the ventilation controller (100) and the air conditioning controller (250) via a communication line such as the Internet.

[0181] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments, modifications, and other embodiments may be appropriately combined or substituted as long as the functions of the subject matter of this disclosure are not impaired. Furthermore, the descriptions "first," "second," "third," etc. described above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0182] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for air conditioning systems. [Explanation of symbols]

[0183] 10a First ventilation device 10b Second ventilation device 21 Total heat exchanger (1st heat exchanger) 25 User side heat exchanger (second heat exchanger) 50 Air Conditioning System 100 Ventilation controller (controller) 105 Temperature and humidity sensor (sensor) 200a First air conditioning device 200b Second air conditioning device 200c Third air conditioner 200d 4th air conditioning unit 225 Indoor heat exchanger (3rd heat exchanger)

Claims

1. a ventilation device (10a, 10b) including a first heat exchanger (21) for exchanging heat between outdoor air and indoor air, and a second heat exchanger (25) for exchanging heat between the outdoor air that has passed through the first heat exchanger (21) and a heat medium, the ventilation device supplying the outdoor air to a room and discharging the indoor air to the outside; an air conditioner (200a, 200c) having a third heat exchanger (225) for exchanging heat between indoor air and a heat medium and capable of implementing a plurality of operation modes; a controller (100) that changes the operation of the ventilation device (10a, 10b) depending on the operation mode executed by the air conditioner (200a, 200c); Air conditioning system.

2. The controller (100) changes the amount of heat exchange in the second heat exchanger (25) of the ventilation device (10a, 10b) in accordance with the operation mode executed by the air conditioner (200a, 200c). The air conditioning system of claim 1 .

3. Operation modes that can be implemented by the air conditioners (200a, 200c) include an indoor air heating mode in which indoor air is heated in the third heat exchanger (225), The ventilation device (10a, 10b) is capable of executing an outdoor air heating mode in which outdoor air is heated in the second heat exchanger (25), When the air conditioner (200a, 200c) starts the indoor air heating mode while the ventilation device (10a, 10b) is executing the outdoor air heating mode, the controller (100) reduces the amount of heating of the second heat exchanger (25) of the ventilation device (10a, 10b) or stops heating of the outdoor air in the second heat exchanger (25).

3. The air conditioning system according to claim 2.

4. Operation modes that can be implemented by the air conditioners (200a, 200c) include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225), When the air conditioner (200a, 200c) starts the indoor air cooling mode in a state in which the cooling of the outdoor air in the second heat exchanger (25) of the ventilation device (10a, 10b) is stopped, the controller (100) starts cooling of the outdoor air in the second heat exchanger (25).

3. The air conditioning system according to claim 2.

5. Operation modes that can be implemented by the air conditioners (200a, 200c) include an indoor air cooling mode in which indoor air is cooled in the third heat exchanger (225), The ventilation device (10a, 10b) is capable of executing an outdoor air cooling mode in which outdoor air is cooled in the second heat exchanger (25), When the air conditioners (200a, 200c) are operating in the inside air cooling mode and the ventilation devices (10a, 10b) are operating in the outside air cooling mode, the temperature of the third heat exchanger (225) is higher than the temperature of the second heat exchanger (25). The air conditioning system of claim 1 .

6. The volume of the third heat exchanger (225) of the air conditioner (200a, 200c) is larger than the volume of the second heat exchanger (25) of the ventilation device (10a, 10b). An air conditioning system according to any one of claims 1 to 5.

7. The controller (100) continues to operate the ventilation devices (10a, 10b) even if the air conditioners (200a, 200c) are stopped while the ventilation devices (10a, 10b) are in operation. An air conditioning system according to any one of claims 1 to 5.

8. After the air conditioners (200a, 200c) are stopped, the controller (100) causes the ventilation devices (10a, 10b) to perform the same operations as those performed by the ventilation devices (10a, 10b) before the air conditioners (200a, 200c) are started.

8. The air conditioning system according to claim 7.

9. The ventilation device (10a, 10b) includes a sensor (105) that measures the temperature and humidity of outdoor air passing through the first heat exchanger (21) and flowing toward the second heat exchanger (25); The controller (100) changes the amount of heat exchange in the second heat exchanger (25) based on the measurement value of the sensor (105). An air conditioning system according to any one of claims 1 to 5.

Images