JP2023091400A - Air-conditioning system - Google Patents

Abstract

To provide an air-conditioning system which can perform an individual operation and a common operation of convection-type air-conditioning and radiation-type air-conditioning.SOLUTION: First piping 11 makes a first refrigerant circulate to a compressor 5, an outdoor heat exchanger 6, a first expansion valve 7, an indoor machine 2, and a four-way valve 8. Second piping 12 connects a first branch point arranged between the first expansion valve 7 and the indoor machine 2 of the piping 11 and a second branch point arranged between the indoor machine 2 and the four-way valve 8, and makes the first refrigerant circulate to a heat source unit 9. By the switching between a flow passage of a first selector valve 21 arranged at the first branch point and a flow passage of a second selector valve 22 arranged at the second branch point, the first refrigerant flows to both the indoor machine 2 and the heat source unit 9, to only the indoor machine 2, or to only the heat source unit 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to an air conditioning system.

The air conditioner described in Patent Document 1 has a configuration in which an indoor heat exchanger and a radiation heat exchanger are connected in series with respect to a heat pump cycle. When the air conditioner performs convection air conditioning and radiation air conditioning at the same time, the indoor heat exchanger raises the temperature of the air, the indoor fan blows warm air into the room, and the radiation heat exchanger raises the temperature of the heat radiation panel. The heat radiation panel radiates the radiant heat into the room. When the air conditioner performs only radiant air conditioning, the indoor heat exchanger and the radiant heat exchanger act as condensers, but since the indoor fan is in the off state, warm air is not sent and the heat radiation panel does not Only heat radiation takes place.

JP-A-63-113239

The air conditioner described in Patent Literature 1 cannot operate the indoor heat exchanger and the radiation heat exchanger separately. As a result, the heat radiation panel constantly radiates radiant heat into the room, making it difficult for the air conditioner to perform only convection air conditioning.

An object of the present invention is to provide an air conditioning system capable of operating convection air conditioning and radiant air conditioning individually and in combination.

An air conditioning system according to the present invention includes an indoor unit that blows temperature-controlled air into an air-conditioned area, a radiation panel that radiates radiant heat into the air-conditioned area, a compressor, an outdoor heat exchanger, and a first expansion valve. , and an outdoor unit having a four-way valve, a first pipe for circulating a first refrigerant to the compressor, the outdoor heat exchanger, the first expansion valve, the indoor unit, and the four-way valve, and the first pipe A first branch point provided between the first expansion valve and the indoor unit and a second branch point provided between the indoor unit and the four-way valve are connected, and the radiation panel A second pipe that supplies the first refrigerant to and provided at the first branch point for connection and disconnection between the outdoor unit and the indoor unit, and connection between the outdoor unit and the radiation panel and a first switching valve for switching between and cutoff, and a first switching valve provided at the second branch point for connecting and disconnecting between the outdoor unit and the indoor unit, and connecting and disconnecting between the outdoor unit and the radiation panel. and a second switching valve for switching.

According to the present invention, it is possible to provide an air conditioning system capable of individual operation and combined operation of convection air conditioning and radiant air conditioning.

1 is a configuration diagram of an air conditioning system according to Embodiment 1, showing a state during cooling operation. FIG. 1 is a configuration diagram of an air conditioning system according to Embodiment 1, showing a state during heating operation. FIG. 1 is a configuration diagram of an air conditioning system according to Embodiment 1, showing a state during radiant cooling operation. FIG. 1 is a configuration diagram of an air conditioning system according to Embodiment 1, showing a state during convection cooling operation. FIG. FIG. 4 is a configuration diagram of an air conditioning system according to Embodiment 2, showing a state during cooling operation. FIG. 11 is a configuration diagram of an air conditioning system according to Embodiment 3, showing a state during cooling operation. FIG. 11 is a configuration diagram of an air conditioning system according to Embodiment 4, showing a state during cooling operation. FIG. 11 is a block diagram showing the configuration of an air conditioning system according to Embodiment 5; 13 is a flow chart showing an example of basic operation of a control device according to Embodiment 5. FIG. 14 is a flowchart showing an operation example of the control device when stopping the operation of the radiant air conditioner during the cooling operation in Embodiment 5. FIG. 14 is a flowchart showing an operation example of the control device when stopping the operation of the radiant air conditioner during the heating operation in Embodiment 5. FIG. 14 is a flowchart showing an operation example of the control device when dehumidifying during cooling operation in Embodiment 5. FIG. 13 is a flow chart showing a modification of the basic operation of the control device according to Embodiment 5. FIG.

An embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

<Embodiment 1>
The configuration of an air conditioning system 1 according to Embodiment 1 will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a configuration diagram of an air conditioning system 1 according to Embodiment 1, and shows a state during cooling operation. FIG. 2 is a configuration diagram of the air conditioning system 1 according to Embodiment 1, and shows a state during heating operation. In each figure, the direction in which the refrigerant flows in the piping is indicated by an arrow.

The air conditioning system 1 mainly includes an indoor unit 2, a radiation panel 3, an outdoor unit 4, a heat source unit 9, a first pipe 11, a second pipe 12, a third pipe 13, a first switching valve 21, and a second switching A valve 22 is provided.

The indoor unit 2 is installed indoors, which is an air-conditioned area. The indoor unit 2 causes heat exchange between the first refrigerant flowing through the first pipe 11 and the air in the air conditioning area, and blows out the heat-exchanged air into the air conditioning area. The air-conditioned area is cooled or heated by the cool air or warm air blown out from the indoor unit 2 . In addition, the indoor unit 2 may be installed outside the air-conditioned area and connected to the air-conditioned area via a duct.

The outdoor unit 4 is installed outdoors outside the air conditioning area. The outdoor unit 4 includes a compressor 5 , an outdoor heat exchanger 6 , a first expansion valve 7 and a four-way valve 8 . The first pipe 11 annularly connects the compressor 5 , the outdoor heat exchanger 6 , the first expansion valve 7 , the indoor unit 2 , and the four-way valve 8 . A heat pump cycle is composed of the compressor 5 , the outdoor heat exchanger 6 , the first expansion valve 7 , the indoor unit 2 , and the four-way valve 8 that are connected by the first pipe 11 . A first refrigerant circulates through the first pipe 11 . The first refrigerant is refrigerant gas for room air conditioners.

The compressor 5 compresses the first refrigerant to raise its temperature and outputs it to the four-way valve 8 . The four-way valve 8 switches the direction in which the first refrigerant flows depending on whether the operation of the air conditioning system 1 is cooling operation or heating operation. The outdoor heat exchanger 6 exchanges heat between the first refrigerant flowing through the first pipe 11 and outdoor air, and blows out the heat-exchanged air to the outdoor. The first expansion valve 7 reduces the pressure of the first refrigerant to lower the temperature.

A first branch point at which the first pipe 11 branches to the second pipe 12 is provided between the first expansion valve 7 and the indoor unit 2 in the first pipe 11 . Further, a second branch point is provided between the indoor unit 2 and the four-way valve 8 in the first pipe 11 to branch from the first pipe 11 to the second pipe 12 . The second pipe 12 connects the first branch point and the second branch point. By providing the second pipe 12 , the air conditioning system 1 has a configuration in which the indoor unit 2 and the heat source unit 9 are connected in parallel to the outdoor unit 4 .

A first switching valve 21 is provided at the first branch point. The first switching valve 21 switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the heat source unit 9 . A second switching valve 22 is provided at the second branch point. The second switching valve 22 switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the heat source unit 9 . Each of the first switching valve 21 and the second switching valve 22 is realized by a three-way valve or the like. In the illustrated example, the first switching valve 21 and the second switching valve 22 are built in the outdoor unit 4, but the arrangement of the first switching valve 21 and the second switching valve 22 is not limited to the illustrated example.

The radiation panel 3 is installed in the air conditioning area. The radiation panel 3 is attached to the third pipe 13 . The third pipe 13 connects the radiation panel 3 and the water heat exchanger 10 in an annular fashion. The second coolant flowing through the third pipe 13 cools or heats the radiation panel 3, thereby causing the radiation panel 3 to radiate radiation heat into the air-conditioned area. The radiant heat of the radiant panel 3 cools or heats the air-conditioned area. The second refrigerant is water or antifreeze.

The heat source unit 9 has a water heat exchanger 10 and a pump 14 . The water heat exchanger 10 exchanges water heat between the first refrigerant flowing through the second pipe 12 and the second refrigerant flowing through the third pipe 13 . The pump 14 circulates the second refrigerant within the third pipe 13 . The heat source unit 9 may be installed outdoors or indoors.

The air conditioning system 1 can implement convection air conditioning that cools and heats the air conditioned area by convection and radiation air conditioning that cools and heats the air conditioned area by radiation. Convective air conditioning is realized by a convective air conditioner including an indoor unit 2 and an outdoor unit 4 . The convection air conditioner corresponds to the convection air conditioner 41 shown in FIG. 8 which will be described later. The cooling operation performed by the convection air conditioner may be described as "convection cooling operation", and the heating operation performed by the convection air conditioner may be described as "convection heating operation". Radiant air conditioning is realized by a radiant air conditioner including an indoor unit 2 , a radiation panel 3 and a heat source unit 9 . The radiant air conditioner corresponds to the radiant air conditioner 42 shown in FIG. 8 which will be described later. The cooling operation performed by the radiant air conditioner may be described as "radiant cooling operation", and the heating operation performed by the radiant air conditioner may be described as "radiant heating operation".

Next, a case where the air conditioning system 1 simultaneously performs the convection cooling operation and the radiation cooling operation will be described. As shown in FIG. 1 , the four-way valve 8 switches the flow path so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6 . The first switching valve 21 switches the flow path so that the first refrigerant flows from the first expansion valve 7 to the indoor unit 2 and from the first expansion valve 7 to the water heat exchanger 10 . The second switching valve 22 switches the flow path so that the first refrigerant flows from the indoor unit 2 to the four-way valve 8 and from the water heat exchanger 10 to the four-way valve 8 .

The first refrigerant compressed by the compressor 5 exchanges heat with outdoor air in the outdoor heat exchanger 6 and flows to the first expansion valve 7 . The first refrigerant that has flowed to the first expansion valve 7 is decompressed by the first expansion valve 7 and flows to the indoor unit 2 and the water heat exchanger 10 via the first switching valve 21 . The first refrigerant that has flowed to the indoor unit 2 exchanges heat with the air in the air conditioning area. The air cooled by heat exchange is sent from the indoor unit 2 into the air-conditioned area. After heat exchange, the first refrigerant flows to the four-way valve 8 via the second switching valve 22 . The first refrigerant that has flowed to the four-way valve 8 flows to the compressor 5 again.

The first refrigerant flowing through the first switching valve 21 to the water heat exchanger 10 exchanges water heat with the second refrigerant flowing through the third pipe 13 . After water heat exchange, the first refrigerant flows to the four-way valve 8 via the second switching valve 22 . The first refrigerant that has flowed to the four-way valve 8 flows to the compressor 5 again. The second refrigerant after water heat exchange flows through the third pipe 13 to the radiation panel 3 . The second refrigerant that has flowed to the radiation panel 3 cools the radiation panel 3 and flows to the water heat exchanger 10 again.

Next, a case where the air conditioning system 1 simultaneously performs the convection heating operation and the radiation heating operation will be described. As shown in FIG. 2 , the four-way valve 8 switches the flow path so that the first refrigerant flows from the outdoor heat exchanger 6 to the compressor 5 . The first switching valve 21 switches the flow path so that the first refrigerant flows from the indoor unit 2 to the first expansion valve 7 and from the water heat exchanger 10 to the first expansion valve 7 . The second switching valve 22 switches the flow paths so that the first refrigerant flows from the four-way valve 8 to the indoor unit 2 and from the four-way valve 8 to the water heat exchanger 10 .

The first refrigerant compressed by the compressor 5 flows through the four-way valve 8 and the second switching valve 22 to the indoor unit 2 and the water heat exchanger 10 . The first refrigerant that has flowed to the indoor unit 2 exchanges heat with the air in the air conditioning area. The air heated by heat exchange is sent from the indoor unit 2 into the air-conditioned area. After heat exchange, the first refrigerant flows to the first expansion valve 7 via the first switching valve 21 . The first refrigerant that has flowed to the first expansion valve 7 is decompressed by the first expansion valve 7 and flows to the outdoor heat exchanger 6 . The first refrigerant that has flowed to the outdoor heat exchanger 6 exchanges heat with outdoor air in the outdoor heat exchanger 6 and flows to the four-way valve 8 . The first refrigerant that has flowed to the four-way valve 8 flows to the compressor 5 again.

The first refrigerant flowing through the second switching valve 22 to the water heat exchanger 10 exchanges water heat with the second refrigerant flowing through the third pipe 13 . After exchanging water heat, the first refrigerant flows to the first expansion valve 7 via the first switching valve 21 . The second refrigerant after water heat exchange flows through the third pipe 13 to the radiation panel 3 . The second refrigerant that has flowed to the radiation panel 3 heats the radiation panel 3 and flows to the water heat exchanger 10 again.

Next, with reference to FIG. 3, the case where the air-conditioning system 1 performs only radiation cooling operation will be described. FIG. 3 is a configuration diagram of the air conditioning system 1 according to Embodiment 1, and shows a state during radiation cooling operation. The four-way valve 8 switches the flow path so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6 . The first switching valve 21 switches the flow path so that the first refrigerant flows from the first expansion valve 7 to the water heat exchanger 10 . The second switching valve 22 switches the flow path so that the first refrigerant flows from the water heat exchanger 10 to the four-way valve 8 . Therefore, the portion of the first pipe 11 indicated by the dashed arrow in FIG. 3 is blocked, and the first refrigerant does not flow through this portion of the pipe. Also, the indoor unit 2 stops operating. Thereby, the air conditioning system 1 can perform only radiation cooling operation.

When the air-conditioning system 1 performs only the radiation heating operation, the four-way valve 8 switches to the flow path for the heating operation, and reverses the flow direction of the first refrigerant to that during the cooling operation.

Next, with reference to FIG. 4, the case where the air conditioning system 1 performs only the convection cooling operation will be described. FIG. 4 is a configuration diagram of the air conditioning system 1 according to Embodiment 1, and shows a state during convection cooling operation. The four-way valve 8 switches the flow path so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6 . The first switching valve 21 switches the flow path so that the first refrigerant flows from the first expansion valve 7 to the indoor unit 2 . The second switching valve 22 switches the flow path so that the first refrigerant flows from the indoor unit 2 to the four-way valve 8 . Therefore, the second pipe 12 indicated by the dashed arrow in FIG. 4 is blocked, and the first refrigerant does not flow through the second pipe 12 . Also, the heat source unit 9 stops operating. Thereby, the air conditioning system 1 can perform only the convection cooling operation.

When the air conditioning system 1 performs only convective cooling operation, the four-way valve 8 switches to the flow path for heating operation, and reverses the flow direction of the first refrigerant to that during cooling operation.

The first embodiment has been described above with reference to FIGS. 1 to 4. FIG. According to Embodiment 1, the air conditioning system 1 includes the indoor unit 2, the radiation panel 3, the outdoor unit 4, the first pipe 11, the second pipe 12, the third pipe 13, and the heat source unit 9. , a first switching valve 21 and a second switching valve 22 . The indoor unit 2 blows temperature-controlled air into the air-conditioned area. The radiation panel 3 radiates radiant heat into the air-conditioned area. The outdoor unit 4 has a compressor 5 , an outdoor heat exchanger 6 , a first expansion valve 7 and a four-way valve 8 . The first pipe 11 circulates the first refrigerant to the compressor 5 , the outdoor heat exchanger 6 , the first expansion valve 7 , the indoor unit 2 and the four-way valve 8 . The second pipe 12 has a first branch point provided between the first expansion valve 7 and the indoor unit 2 in the first pipe 11 and a second branch point provided between the indoor unit 2 and the four-way valve 8. connect between The third pipe 13 circulates the second coolant to the radiation panel 3 . The heat source unit 9 has a water heat exchanger 10 that performs water heat exchange between the first refrigerant flowing through the second pipe 12 and the second refrigerant flowing through the third pipe 13 . The first switching valve 21 is provided at the first branch point, and switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the heat source unit 9 . The second switching valve 22 is provided at the second branch point, and switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the heat source unit 9 . As a result, the indoor unit 2 and the heat source unit 9 are connected in parallel to one outdoor unit 4 . In this configuration, the flow path is switched by the first switching valve 21 and the second switching valve 22 to flow the first refrigerant only to the indoor unit 2, only to the heat source unit 9, or to both the indoor unit 2 and the heat source unit 9. can be done. Therefore, the air conditioning system 1 is capable of individual operation and combined operation of convection air conditioning and radiant air conditioning.

Convection air conditioning blows cool air or warm air from the indoor unit 2 into the air-conditioned area, so that the air temperature in the air-conditioned area can be efficiently adjusted to the target temperature. On the other hand, the user may feel uncomfortable with the cool or warm air blown from the indoor unit 2 . On the other hand, radiant air conditioning radiates radiant heat from the radiant panel 3, so comfort is high. However, radiant heat is inefficient due to its low ability to cool or warm air-conditioned areas. Since the air conditioning system 1 is capable of operating convective air conditioning and radiant air conditioning individually and in combination, it is possible to selectively use convective air conditioning and radiant air conditioning according to energy saving and comfort. .

<Embodiment 2>
FIG. 5 is a configuration diagram of the air conditioning system 1 according to Embodiment 2, and shows a state during cooling operation. In FIG. 5, the same or corresponding parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will not be repeated.

The air conditioning system 1 according to Embodiment 2 has a configuration in which a second expansion valve 31 is added to the air conditioning system 1 according to Embodiment 1 shown in FIGS. The second expansion valve 31 is provided at a position closer to the radiation panel 3 than the first switching valve 21 in the second pipe 12 .

In Embodiment 2, the degree of opening of the first expansion valve 7 is primarily controlled according to the operating load of the convection air conditioning. The degree of opening of the second expansion valve 31 is secondarily controlled according to the operating load of the radiant air conditioning. Thereby, the air conditioning system 1 can change the operating load factor of the convection air conditioning and the radiation air conditioning when performing the convection air conditioning and the radiation air conditioning at the same time.

<Embodiment 3>
FIG. 6 is a configuration diagram of the air conditioning system 1 according to Embodiment 3, and shows a state during cooling operation. In FIG. 6, the same or corresponding parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will not be repeated.

The air conditioning system 1 according to Embodiment 3 has a configuration in which a third expansion valve 32 is added to the air conditioning system 1 according to Embodiment 2 shown in FIG. The third expansion valve 32 is provided at a position closer to the indoor unit 2 than the first switching valve 21 in the first pipe 11 .

In Embodiment 3, the degree of opening of the first expansion valve 7 is primarily controlled according to the operating load of the convection air conditioning. The degree of opening of the second expansion valve 31 is secondarily controlled according to the operating load of the radiant air conditioning. The degree of opening of the third expansion valve 32 is secondarily controlled according to the operating load of the convection air conditioning system. As a result, the air conditioning system 1 can independently control the operating load of the convective air conditioning and the operating load of the radiant air conditioning when the convective air conditioning and the radiant air conditioning are performed at the same time.

<Embodiment 4>
FIG. 7 is a configuration diagram of the air conditioning system 1 according to Embodiment 4, and shows a state during cooling operation. In FIG. 7, the same or corresponding parts as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof will not be repeated.

The air conditioning system 1 according to Embodiment 4 mainly includes an indoor unit 2, a radiation panel 3, an outdoor unit 4, a first pipe 11, a second pipe 12, a first switching valve 21, and a second switching valve 22. . The air conditioning system 1 according to Embodiment 4 has a configuration in which the indoor unit 2 and the radiation panel 3 are connected in parallel to the outdoor unit 4 by providing the second pipe 12 .

A second pipe 12 branched from the first pipe 11 supplies the first coolant to the radiation panel 3 . The first switching valve 21 switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the radiation panel 3 . The second switching valve 22 switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the radiation panel 3 .

The radiation panel 3 is attached to the second pipe 12 . The first coolant flowing through the second pipe 12 cools or heats the radiation panel 3, thereby causing the radiation panel 3 to radiate radiation heat into the air-conditioned area. In Embodiment 4, a radiant air conditioner is realized by the outdoor unit 4 and the radiant panel 3 .

When the air-conditioning system 1 performs heating operation, the four-way valve 8 switches to the flow path for heating operation, and reverses the flow direction of the first refrigerant to that during cooling operation.

According to Embodiment 4, the air conditioning system 1 includes the indoor unit 2, the radiation panel 3, the outdoor unit 4, the first pipe 11, the second pipe 12, the first switching valve 21, and the second switching a valve 22; The indoor unit 2 blows temperature-controlled air into the air-conditioned area. The radiation panel 3 radiates radiant heat into the air-conditioned area. The outdoor unit 4 has a compressor 5 , an outdoor heat exchanger 6 , a first expansion valve 7 and a four-way valve 8 . The first pipe 11 circulates the first refrigerant to the compressor 5 , the outdoor heat exchanger 6 , the first expansion valve 7 , the indoor unit 2 and the four-way valve 8 . The second pipe 12 has a first branch point provided between the first expansion valve 7 and the indoor unit 2 in the first pipe 11 and a second branch point provided between the indoor unit 2 and the four-way valve 8. and supply the first coolant to the radiation panel 3 . The first switching valve 21 is provided at the first branch point, and switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the radiation panel 3 . The second switching valve 22 is provided at the second branch point, and switches connection and disconnection between the outdoor unit 4 and the indoor unit 2 and connection and disconnection between the outdoor unit 4 and the radiation panel 3 . As a result, the indoor unit 2 and the radiation panel 3 are connected in parallel to one outdoor unit 4 . In this configuration, the flow path is switched by the first switching valve 21 and the second switching valve 22 to flow the first refrigerant only to the indoor unit 2, only to the radiation panel 3, or to both the indoor unit 2 and the radiation panel 3. can be done. Therefore, the air conditioning system 1 is capable of individual operation and combined operation of convection air conditioning and radiant air conditioning.

Embodiments 1 to 4 of the present invention have been described above with reference to the drawings (FIGS. 1 to 7). However, the configuration of the air conditioning system 1 is not limited to the above-described Embodiments 1 to 4, and can be implemented in various aspects without departing from the gist thereof. Modifications 1 to 3 are described below.

<Modification 1>
In Modification 1, the air conditioning system 1 has two expansion valves, the first expansion valve 7 and the third expansion valve 32 , and does not have the second expansion valve 31 . The opening degree of the first expansion valve 7 is primarily controlled according to the operating load of the radiant air conditioning system. The degree of opening of the third expansion valve 32 is secondarily controlled according to the operating load of the convection air conditioning system. Thereby, the air conditioning system 1 can change the operating load factor of the convection air conditioning and the radiation air conditioning when performing the convection air conditioning and the radiation air conditioning at the same time.

<Modification 2>
In Modification 2, the air conditioning system 1 includes two expansion valves, a second expansion valve 31 and a third expansion valve 32, and does not have the first expansion valve 7. FIG. The degree of opening of the second expansion valve 31 is controlled according to the operating load of the radiant air conditioning. The degree of opening of the third expansion valve 32 is controlled according to the operating load of the convection air conditioning system. As a result, the air conditioning system 1 can independently control the operating load of the convective air conditioning and the operating load of the radiant air conditioning when the convective air conditioning and the radiant air conditioning are performed at the same time. Note that when there is the first expansion valve 7 as in the third embodiment, the first expansion valve 7 temporarily lowers the pressure of the first refrigerant, so the pressure load applied to the first switching valve 21 is reduced, There is an advantage that the durability of the switching valve 21 is improved.

<Modification 3>
At least one of the second expansion valve 31 and the third expansion valve 32 may be added to the air conditioning system 1 according to the fourth embodiment. Moreover, in the configuration in which both the second expansion valve 31 and the third expansion valve 32 are added to the air conditioning system 1 according to Embodiment 4, the first expansion valve 7 may be omitted.

<Embodiment 5>
In Embodiment 5, operations of the air conditioning system 1 according to Embodiments 1 to 4 will be described. 1 to 7 are referred to below.

FIG. 8 is a block diagram showing the configuration of the air conditioning system 1 according to Embodiment 5. As shown in FIG. The air conditioning system 1 mainly includes a convection air conditioner 41 , a radiation air conditioner 42 , a control device 50 , an operation terminal 61 , a temperature sensor 62 , a humidity sensor 63 and a ventilation device 64 . The control device 50 includes an information acquisition section 51 , a determination section 52 and a control section 53 .

The convection air conditioner 41 is composed of the indoor unit 2 and the outdoor unit 4 shown in FIGS. 1 to 7. FIG. The radiation air conditioner 42 is composed of the radiation panel 3, the outdoor unit 4, and the heat source unit 9 shown in FIGS. Alternatively, the radiant air conditioner 42 is composed of the radiant panel 3 and the outdoor unit 4 shown in FIG. In the following description, it is assumed that the radiation type air conditioner 42 is composed of the radiation panel 3 , the outdoor unit 4 and the heat source unit 9 .

As described in the first to fourth embodiments, the radiant air conditioner 42 cools or heats the radiant panel 3 using the heat pump cycle of the convection air conditioner 41 . Therefore, when the convection air conditioner 41 and the radiation air conditioner 42 operate simultaneously, the air conditioning capacity of the convection air conditioner 41 is lowered. Therefore, in the fifth embodiment, the control device 50 optimally controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 .

Information acquisition unit 51 acquires information from at least one of operation terminal 61 , temperature sensor 62 , humidity sensor 63 , and ventilation device 64 . Information acquisition unit 51 outputs the acquired information to determination unit 52 . The determination unit 52 determines operation details of the convection air conditioner 41 and the radiation air conditioner 42 based on the information acquired by the information acquisition unit 51 . The determination unit 52 outputs the determination result to the control unit 53 . The control unit 53 controls the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 .

The information acquisition unit 51 is an interface through which information is input. The determination unit 52 has, for example, a processor such as a CPU (Central Processing Unit), and memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory). For example, the determination unit 52 executes various processes specified by the computer program when the processor executes a computer program stored in advance in the memory. The control unit 53 is a circuit that drives various devices included in the convection air conditioner 41 and the radiation air conditioner 42 .

When the air conditioning system 1 simultaneously performs the convection cooling operation and the radiation cooling operation, the control unit 53 switches the flow path of the four-way valve 8 so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6. . Further, the control unit 53 switches the flow path of the first switching valve 21 so that the first refrigerant flows from the first expansion valve 7 to the indoor unit 2 and the water heat exchanger 10, and exchanges water heat with the indoor unit 2. The flow path of the second switching valve 22 is switched so that the first refrigerant flows from the container 10 to the four-way valve 8 . The controller 53 opens the first expansion valve 7 and drives the compressor 5 , the outdoor heat exchanger 6 , the indoor unit 2 , the water heat exchanger 10 and the pump 14 . When the air conditioning system 1 simultaneously performs the convection heating operation and the radiation heating operation, the control unit 53 reverses the flow path of the four-way valve 8 to the flow path during the cooling operation.

When the air conditioning system 1 performs only convection cooling operation, the controller 53 switches the flow path of the four-way valve 8 so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6 . Further, the control unit 53 switches the flow path of the first switching valve 21 so that the first refrigerant flows from the first expansion valve 7 to the indoor unit 2 , and also switches the flow path of the first switching valve 21 so that the first refrigerant flows from the indoor unit 2 to the four-way valve 8 . , the flow path of the second switching valve 22 is switched to . The controller 53 opens the first expansion valve 7 and drives the compressor 5 , the outdoor heat exchanger 6 and the indoor unit 2 . When the air conditioning system 1 performs only the convection heating operation, the control unit 53 reverses the flow path of the four-way valve 8 to the flow path during the cooling operation.

When the air conditioning system 1 performs only radiation cooling operation, the controller 53 switches the flow path of the four-way valve 8 so that the first refrigerant flows from the compressor 5 to the outdoor heat exchanger 6 . Further, the control unit 53 switches the flow path of the first switching valve 21 so that the first refrigerant flows from the first expansion valve 7 to the water heat exchanger 10 , and also switches the flow path of the first switching valve 21 from the water heat exchanger 10 to the four-way valve 8 . The flow path of the second switching valve 22 is switched so that the refrigerant flows. The controller 53 opens the first expansion valve 7 and drives the compressor 5 , the outdoor heat exchanger 6 , the water heat exchanger 10 and the pump 14 . When the air conditioning system 1 performs only radiation heating operation, the controller 53 causes the flow path of the four-way valve 8 to be opposite to the flow path during cooling operation.

The control unit 53 controls at least one of the control of the rotation speed of the compressor 5 (that is, the circulation amount of the first refrigerant), the control of the opening degree of the first expansion valve 7, and the control of the air blowing amount of the indoor unit 2. , the operating load of the convection air conditioner 41 is controlled. Further, when the first pipe 11 is provided with the third expansion valve 32 , the control unit 53 controls the operating load of the convection air conditioner 41 by controlling the degree of opening of the third expansion valve 32 .

The control unit 53 controls the operating load of the radiant air conditioner 42 by controlling the flow rate of the pump 14 . Moreover, when the second expansion valve 31 is provided in the second pipe 12 , the control unit 53 controls the operating load of the radiant air conditioner 42 by controlling the opening degree of the second expansion valve 31 . In addition, when a reservoir tank (not shown) is connected to the third pipe 13, the control unit 53 controls the amount of the second refrigerant flowing into and out of the reservoir tank (not shown), so that the radiant air conditioner 42 Control the driving load.

The operation terminal 61 is a terminal for the user to operate the air conditioning system 1 . The operation terminal 61 is, for example, a remote controller that wirelessly communicates with the control device 50, or a controller that is attached to the wall surface of the air conditioning area and communicates with the control device 50 by wire. An operation to start or stop the cooling operation of the air conditioning system 1, an operation to start or stop the heating operation of the air conditioning system 1, an operation to set the target temperature of the air conditioning area, and the like are performed on the operation terminal 61 . The operation terminal 61 outputs operation information indicating the details of the operation performed by the user to the information acquisition unit 51 . The control device 50 controls the operation of the convection air conditioner 41 and the radiation air conditioner 42 according to the details of the operation performed by the user.

The temperature sensor 62 is, for example, a sensor that measures the air temperature within the air conditioning area. Also, the temperature sensor 62 may be a sensor that measures the air temperature outside the air-conditioned area. Also, the temperature sensor 62 may be a sensor that measures the surface temperature of the radiation panel 3 . The temperature sensor 62 outputs temperature information indicating the measured temperature to the information acquisition unit 51 .

Humidity sensor 63 is a sensor that measures the relative humidity in the air-conditioned area. Humidity sensor 63 outputs humidity information indicating the measured relative humidity to information acquisition unit 51 .

The ventilator 64 is a device that ventilates the inside of the air-conditioned area. The ventilation device 64 outputs ventilation operation information indicating whether or not the ventilation operation is being performed to the information acquisition unit 51 . The ventilation device 64 may be ventilation means (not shown) included in the air conditioning system 1, or may be a ventilation fan or the like installed in the air conditioning area. Alternatively, the ventilation device 64 may be a window provided in the air-conditioned area. A sensor or the like for detecting an open/closed state is installed on the window, and the sensor or the like outputs the detection result to the information acquisition section 51 . The information acquisition unit 51 regards the state in which the window is open as equivalent to the state in which the ventilator 64 is operating for ventilation.

Next, the operation of the control device 50 will be described with reference to FIGS. 9 to 12. FIG. FIG. 9 is a flowchart showing an example of basic operation of the control device 50 according to the fifth embodiment. Here, the convection air conditioner 41 and the radiation air conditioner 42 are in cooling operation or heating operation.

In step S<b>11 , the determination unit 52 estimates the air conditioning load based on the information acquired by the information acquisition unit 51 . If the air-conditioning load is greater than the predetermined air-conditioning load threshold value Q (step S11; Yes), the process of the determination unit 52 proceeds to step S12. If the air-conditioning load is equal to or less than the air-conditioning load threshold Q (step S11; No), the process of the determination unit 52 returns to step S11.

The air conditioning load is the amount of heat required to achieve the target temperature. The air-conditioning load consists of the magnitude of the difference between the target temperature and the temperature inside the air-conditioned area, the magnitude of the temperature difference between inside and outside the air-conditioned area, the insulation performance of the air-conditioned area, and the difference between the outside air flowing into the air-conditioned area and the target temperature. It depends on the size, etc. Examples of situations in which the air conditioning load increases include a situation in which the ventilator 64 is operating for ventilation, a situation in which the air conditioning system 1 has started operation, and the like.

For example, the determination unit 52 determines whether or not the ventilation device 64 is in ventilation operation based on the ventilation operation information acquired from the ventilation device 64 by the information acquisition unit 51 . When the ventilation device 64 starts ventilation or is in ventilation operation, the determination unit 52 determines the temperature inside the air-conditioned area and the temperature outside the air-conditioned area included in the temperature information acquired by the information acquisition unit 51 from the temperature sensor 62. Calculate the difference between The determination unit 52 determines that the air conditioning load is greater than the air conditioning load threshold Q when the temperature difference between inside and outside the air conditioning area is greater than a predetermined temperature difference ΔT1.

For example, the determination unit 52 determines the target temperature included in the operation information acquired by the information acquisition unit 51 from the operation terminal 61 and the temperature in the air-conditioned area included in the temperature information acquired by the information acquisition unit 51 from the temperature sensor 62. Calculate the difference. The determination unit 52 determines that the air conditioning load is greater than the air conditioning load threshold Q when the difference between the target temperature and the air temperature in the air conditioning area is greater than a predetermined temperature difference ΔT2. The temperature difference ΔT2 may be the same as or different from the temperature difference ΔT1.

In step S<b>12 , the determination unit 52 determines that the convection air conditioner 41 should be preferentially operated over the radiation air conditioner 42 because the air conditioning load is large. As a specific example, the determination unit 52 determines that the operation of the radiant air conditioner 42 is weakened compared to when the air conditioning load is the air conditioning load threshold Q or less. Alternatively, the determination unit 52 may determine that the operation of the radiant air conditioner 42 should be stopped rather than weakened. The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 .

The reason why the convection air conditioner 41 is preferentially operated is that the convection air conditioner 41 has a higher ability to cool or warm the air in the air conditioning area than the radiation air conditioner 42 does. However, since the convection air conditioner 41 and the radiation air conditioner 42 are in a relationship of receiving the heat of the first refrigerant, when the convection air conditioner 41 is preferentially operated under a high load, the radiation air conditioner 42 is used. It is necessary to operate under low load or to stop. The determination unit 52 determines whether to weaken or stop the operation of the radiation air conditioner 42 (step S12), for example, based on the magnitude of the operating load of the convection air conditioner 41 linked to the magnitude of the air conditioning load. conduct. It should be noted that once the temperature of the second refrigerant flowing through the third pipe 13 and the radiation panel 3 rises during the cooling operation, it takes time for the temperature to drop again. Therefore, the determination unit 52 may determine that the radiant air conditioner 42 should be operated at a low load instead of stopping the cooling operation. Similarly, once the temperature of the second coolant and the radiation panel 3 drops during the heating operation, it takes time before the temperature rises again. Therefore, the determination unit 52 may determine that the radiant air conditioner 42 should be operated at a low load instead of stopping the heating operation.

In step S<b>13 , the determination unit 52 estimates the air conditioning load based on the information acquired by the information acquisition unit 51 . If the air-conditioning load is equal to or less than the air-conditioning load threshold Q (step S13; Yes), the process of the determination unit 52 returns to step S11. If the air-conditioning load is greater than the air-conditioning load threshold value Q (step S13; No), the process of the determination unit 52 returns to step S13.

By executing the control method shown in the flowchart of FIG. 9, the control device 50 can optimally perform combined operation of convective air conditioning and radiant air conditioning in the air conditioning system 1 .

FIG. 10 is a flowchart showing an operation example of the control device 50 when the operation of the radiant air conditioner 42 is stopped during the cooling operation in the fifth embodiment. Here, the convection air conditioner 41 and the radiation air conditioner 42 are performing cooling operation. The determination unit 52 performs the operations of the flowchart shown in FIG. 9 and the operations of the flowchart shown in FIG. 10 in parallel.

When the determination unit 52 determines to stop the operation of the convection air conditioner 41 in step S12 shown in FIG. 9 (step S21; Yes), the processing of the determination unit 52 proceeds to step S22. Otherwise (step S21; No), the processing of the determination unit 52 returns to step S21.

In step S<b>22 , the determination unit 52 determines that the cooling operation of the radiation air conditioner 42 is given priority over the convection air conditioner 41 . As a specific example, the determination unit 52 determines that the cooling operation by the convection air conditioner 41 is weakened compared to when the air conditioning load is equal to or less than the air conditioning load threshold Q. On the other hand, the determination unit 52 determines that the cooling operation by the radiant air conditioner 42 is to be strengthened compared to when the air conditioning load is the air conditioning load threshold Q or less. The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 . Due to the preferential operation of the radiant air conditioner 42, the surface temperature of the radiant panel 3 is lowered.

In step S23, based on the temperature information indicating the surface temperature of the radiation panel 3 acquired by the information acquisition unit 51, the determination unit 52 determines whether the surface temperature of the radiation panel 3 has fallen below a predetermined temperature lower limit value Tpc. judge. When the surface temperature of the radiation panel 3 is lower than the temperature lower limit value Tpc (step S23; Yes), the process of the determination unit 52 proceeds to step S24. If the surface temperature of the radiation panel 3 has not decreased to the temperature lower limit Tpc (step S23; No), the process of the determination section 52 returns to step S23.

In step S<b>24 , the determination unit 52 determines to give priority to the cooling operation of the convection air conditioner 41 over the radiation air conditioner 42 . In step S<b>25 , the determination unit 52 determines to stop the operation of the radiant air conditioner 42 . The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 .

The control device 50 cools the radiant panel 3 during cooling operation with a large air conditioning load and before the radiant air conditioner 42 stops by executing the control method shown in the flowchart of FIG. 10 . As a result, the radiation panel 3 continues to radiate radiation heat for a while after the radiation type air conditioner 42 stops operating in step S25. Therefore, user's comfort is ensured. Since the convection air conditioner 41 can perform high-load operation by stopping the operation of the radiation air conditioner 42, the inside of the air-conditioned area can be rapidly cooled.

FIG. 11 is a flowchart showing an operation example of the control device 50 when the operation of the radiant air conditioner 42 is stopped during the heating operation in the fifth embodiment. Here, the convection air conditioner 41 and the radiation air conditioner 42 are performing heating operation. The determination unit 52 performs the operations of the flowchart shown in FIG. 9 and the operations of the flowchart shown in FIG. 11 in parallel.

When the determination unit 52 determines to stop the operation of the convection air conditioner 41 in step S12 shown in FIG. 9 (step S31; Yes), the processing of the determination unit 52 proceeds to step S32. Otherwise (step S31; No), the process of the determination unit 52 returns to step S31.

In step S<b>32 , the determination unit 52 determines to give priority to the heating operation of the radiation air conditioner 42 over the convection air conditioner 41 . As a specific example, the determination unit 52 determines that the heating operation by the convection air conditioner 41 is weakened compared to when the air conditioning load is the air conditioning load threshold value Q or less. On the other hand, the determination unit 52 determines that the heating operation by the radiant air conditioner 42 is to be strengthened compared to the case where the air conditioning load is equal to or less than the air conditioning load threshold Q. The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 . Due to the preferential operation of the radiant air conditioner 42, the surface temperature of the radiant panel 3 rises.

In step S33, the determination unit 52 determines whether the surface temperature of the radiation panel 3 has risen above a predetermined upper temperature limit Tph based on the temperature information indicating the surface temperature of the radiation panel 3 acquired by the information acquisition unit 51. judge. When the surface temperature of the radiation panel 3 has risen above the temperature upper limit Tph (step S33; Yes), the process of the determination unit 52 proceeds to step S34. When the surface temperature of the radiation panel 3 has not risen to the temperature upper limit Tph (step S33; No), the process of the determination unit 52 returns to step S33.

In step S<b>34 , the determination unit 52 determines to give priority to the heating operation of the convection air conditioner 41 over the radiation air conditioner 42 . In step S<b>35 , the determination unit 52 determines to stop the operation of the radiant air conditioner 42 . The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 .

The control device 50 warms the radiant panel 3 during the heating operation with a large air conditioning load and before the radiant air conditioner 42 stops by executing the control method shown in the flowchart of FIG. 11 . As a result, the radiation panel 3 continues to radiate radiation heat for a while after the radiation type air conditioner 42 stops operating in step S25. Therefore, user's comfort is ensured. Since the convection air conditioner 41 can perform high-load operation by stopping the operation of the radiation air conditioner 42, the inside of the air-conditioned area can be rapidly warmed.

FIG. 12 is a flowchart showing an operation example of the control device 50 when dehumidifying during cooling operation in the fifth embodiment. Here, the convection air conditioner 41 and the radiation air conditioner 42 are performing cooling operation. The processing of steps S11 to S13 shown in FIG. 12 is the same as the processing of steps S11 to S13 shown in FIG.

In step S<b>41 , the determination unit 52 determines whether the relative humidity is greater than a predetermined humidity threshold H based on the humidity information indicating the relative humidity in the air-conditioned area acquired by the information acquisition unit 51 . If the relative humidity is greater than the humidity threshold H (step S41; Yes), the process of the determination unit 52 proceeds to step S42. When the relative humidity is equal to or lower than the humidity threshold value H (step S41; No), the process of the determination section 52 returns to step S11.

In step S<b>42 , the determination unit 52 determines that the cooling operation of the radiant air conditioner 42 is given priority over the convection air conditioner 41 . The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 . Due to the preferential operation of the radiant air conditioner 42, the surface temperature of the radiant panel 3 is lowered.

By executing the control method shown in the flowchart of FIG. 12, the control device 50 can lower the surface temperature of the radiation panel 3 during the cooling operation to improve the dehumidification capability of the radiation panel 3. Therefore, user's comfort is improved.

FIG. 13 is a flow chart showing a modification of the basic operation of the control device 50 according to the fifth embodiment. The processing of steps S11 to S13 shown in FIG. 13 is the same as the processing of steps S11 to S13 shown in FIG.

In step S<b>51 , the determination unit 52 determines whether or not the cause of the air conditioning load being greater than the air conditioning load threshold Q is disturbance. The disturbance includes ventilation operation by the ventilation device 64, opening and closing of windows for ventilation, and the like. For example, the determination unit 52 determines whether or not disturbance is occurring based on the ventilation operation information acquired by the information acquisition unit 51 . If disturbance is the cause (step S51; Yes), the process of the determination unit 52 proceeds to step S52. If the disturbance is not the cause (step S51; No), the process of the determination unit 52 proceeds to step S12.

In step S<b>52 , the determination unit 52 determines that the operation of the radiation air conditioner 42 is prioritized over the convection air conditioner 41 . The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 . Due to the preferential operation of the radiant air conditioner 42, the surface temperature of the radiant panel 3 rises or falls.

In step S53, the determination unit 52 determines whether or not a predetermined time has elapsed since the time of determination in step S52. If the predetermined time has passed (step S53; Yes), the process of the determination unit 52 proceeds to step S12. If the predetermined time has not elapsed (step S53; No), the processing of the determination unit 52 returns to step S53. The process of step S53 is a process for determining whether the surface temperature of the radiation panel 3 has warmed up to some extent or cooled down to some extent. In this example, the determination unit 52 uses the elapse of time as the determination condition, but the surface temperature of the radiation panel 3 may be used as the determination condition as in step S23 of FIG. 10 and step S33 of FIG.

In step S<b>12 following step S<b>53 , the determination unit 52 determines to give priority to the operation of the convection air conditioner 41 over the radiation air conditioner 42 . That is, the determination unit 52 determines that the heat radiation from the radiation panel 3 is maintained by causing the radiation type air conditioner 42 to operate at a low load. The control unit 53 controls the operations of the convection air conditioner 41 and the radiation air conditioner 42 according to the determination result of the determination unit 52 .

By executing the control method shown in the flowchart of FIG. 13, the control device 50 first prioritizes the operation of the radiant air conditioner 42 and then the convection air conditioner 41 when the air conditioning load increases due to disturbance. give priority to the driving of As a result, the air conditioning system 1 can ensure heat radiation from the radiation panel 3 to maintain the user's comfort, and the high-load operation of the convection air conditioner 41 can quickly respond to temperature changes in the air-conditioned area.

INDUSTRIAL APPLICABILITY The present invention is suitably used for air conditioning in buildings.

1 Air conditioning system 2 Indoor unit 3 Radiation panel 4 Outdoor unit 5 Compressor 6 Outdoor heat exchanger 7 First expansion valve 8 Four-way valve 9 Heat source unit 10 Water heat exchanger 11 First pipe 12 Second pipe 13 Third pipe 14 Pump 21 First switching valve 22 Second switching valve 31 Second expansion valve 32 Third expansion valve 41 Convection air conditioner 42 Radiation air conditioner 50 Control device 51 Information acquisition unit 52 Judgment unit 53 Control unit 61 Operation terminal 62 Temperature sensor 63 humidity sensor 64 ventilator

Claims (11)

an indoor unit that blows temperature-controlled air into an air-conditioned area;
a radiation panel that radiates radiant heat into the air-conditioned area;
an outdoor unit having a compressor, an outdoor heat exchanger, a first expansion valve, and a four-way valve;
a first pipe for circulating a first refrigerant to the compressor, the outdoor heat exchanger, the first expansion valve, the indoor unit, and the four-way valve;
connecting a first branch point provided between the first expansion valve and the indoor unit in the first pipe and a second branch point provided between the indoor unit and the four-way valve; , a second pipe for supplying the first coolant to the radiation panel;
a first switching valve provided at the first branch point for switching connection and disconnection between the outdoor unit and the indoor unit and connection and disconnection between the outdoor unit and the radiation panel;
and a second switching valve provided at the second branch point for switching connection and disconnection between the outdoor unit and the indoor unit and connection and disconnection between the outdoor unit and the radiation panel. system. an indoor unit that blows temperature-controlled air into an air-conditioned area;
a radiation panel that radiates radiant heat into the air-conditioned area;
an outdoor unit having a compressor, an outdoor heat exchanger, a first expansion valve, and a four-way valve;
a first pipe for circulating a first refrigerant to the compressor, the outdoor heat exchanger, the first expansion valve, the indoor unit, and the four-way valve;
Connecting between a first branch point provided between the first expansion valve and the indoor unit in the first pipe and a second branch point provided between the indoor unit and the four-way valve a second pipe;
a third pipe for circulating a second coolant to the radiation panel;
a heat source unit having a water heat exchanger that performs water heat exchange between the first refrigerant flowing through the second pipe and the second refrigerant flowing through the third pipe;
a first switching valve provided at the first branch point for switching connection and disconnection between the outdoor unit and the indoor unit and connection and disconnection between the outdoor unit and the heat source unit;
and a second switching valve provided at the second branch point for switching connection and disconnection between the outdoor unit and the indoor unit and connection and disconnection between the outdoor unit and the heat source unit. system. 3. The air conditioning system according to claim 1, further comprising a second expansion valve provided at a position closer to said radiation panel than said first switching valve in said second pipe. 3. The air conditioning system according to claim 1, further comprising a third expansion valve provided at a position closer to said indoor unit than said first switching valve in said first pipe. A control device for controlling cooling operation and heating operation by the outdoor unit and cooling operation and heating operation by the radiation panel,
When the air-conditioning load is greater than a predetermined air-conditioning load threshold, the control device stops the cooling operation or the heating operation by the radiant panel, or weakens it compared to when the air-conditioning load is equal to or less than the air-conditioning load threshold. The air conditioning system according to any one of claims 1 to 4. When the air-conditioning load is greater than the air-conditioning load threshold and the cooling operation by the radiation panel is stopped, the control device performs cooling by the indoor unit more than when the air-conditioning load is equal to or less than the air-conditioning load threshold. 6. The air according to claim 5, wherein the cooling operation by the radiation panel is strengthened while the operation is weakened, and the cooling operation by the radiation panel is stopped when the temperature of the radiation panel becomes lower than a predetermined temperature lower limit value. harmonious system. When the air conditioning load is greater than the air conditioning load threshold and the heating operation by the radiation panel is stopped, the control device performs heating by the indoor unit compared to when the air conditioning load is equal to or less than the air conditioning load threshold. The air according to claim 5, wherein the heating operation by the radiation panel is strengthened while the operation is weakened, and the heating operation by the radiation panel is stopped when the temperature of the radiation panel exceeds a predetermined upper temperature limit. harmonious system. When a ventilation device that performs ventilation inside and outside the air-conditioned area starts ventilation and a temperature difference between inside and outside the air-conditioned area is greater than a predetermined temperature difference, the control device reduces the air-conditioning load to the air-conditioning load threshold. 8. The air conditioning system according to any one of claims 5 to 7, determined to be greater than. 6. The controller determines that the air conditioning load is greater than the air conditioning load threshold when a difference between a target temperature in the air conditioning area and an air temperature in the air conditioning area is greater than a predetermined temperature difference. 8. The air conditioning system according to any one of 7. When the indoor unit is in cooling operation and the air-conditioning load is equal to or less than the air-conditioning load threshold, the control device controls the radiant panel if the relative humidity in the air-conditioned area is greater than a predetermined humidity threshold. 6. The air conditioning system according to claim 5, wherein cooling operation is enhanced compared to when the air conditioning load is equal to or less than the air conditioning load threshold. When the air-conditioning load becomes greater than the air-conditioning load threshold due to a disturbance, the control device weakens the cooling operation or heating operation of the indoor unit compared to when the air-conditioning load is equal to or less than the air-conditioning load threshold. 6. The air conditioning system according to claim 5, wherein the cooling operation or heating operation by the radiation panel is strengthened, and then the cooling operation or heating operation by the indoor unit is strengthened while the cooling operation or heating operation by the radiation panel is weakened.

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