Air conditioning system and control device

Abstract

To suppress erroneous detection of a refrigerant sensor imposed on other utilization units, in the case where a refrigerant has leaked in the utilization unit.SOLUTION: An air conditioning system includes a first utilization unit, a second utilization unit, a first heat source unit, a control part, and a refrigerant sensor. The first utilization unit is the utilization unit installed in a first indoor space which is the indoor space where the plurality of utilization units is installed. The second utilization unit is the utilization unit installed in the first indoor space and different from the first utilization unit. The first heat source unit is the heat source unit for constituting a refrigerant circuit together with the utilization unit. The control part controls the first utilization unit and the second utilization unit. The refrigerant sensor detects the leakage of the refrigerant in the first utilization unit. In the case where the refrigerant sensor has detected the leakage of the refrigerant in the first utilization unit, the control part brings the second utilization unit into an operation-inhibiting state.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an air conditioning system and a control device. [Background technology]

[0002] Patent Document 1 (JP 2023-119146 A) discloses an air conditioning system that can quickly issue a notification instruction for a refrigerant leak. Summary of the Invention [Problem to be solved by the invention]

[0003] Patent Document 1 does not disclose how to prevent false detection of refrigerant leakage.

[0004] The present disclosure proposes an air conditioning system that can reduce false positives, in which a refrigerant leak in one utilization unit is detected as a refrigerant leak in another utilization unit. [Means for solving the problem]

[0005] The air conditioning system of the first aspect includes a first usage unit, a second usage unit, a first heat source unit, a control unit, and a refrigerant sensor. The first usage unit is a usage unit that exchanges heat between a refrigerant and air in an indoor space, and is installed in a first indoor space that is an indoor space in which a plurality of usage units are installed. The second usage unit is a usage unit installed in the first indoor space and is different from the first usage unit. The first heat source unit is a heat source unit that configures a refrigerant circuit together with the usage units. The control unit controls the first usage unit and the second usage unit. The refrigerant sensor detects refrigerant leakage in the first usage unit. When the refrigerant sensor detects refrigerant leakage in the first usage unit, the control unit disables the second usage unit.

[0006] The air conditioning system according to the present disclosure includes a control unit that disables the second usage unit in the first indoor space when a refrigerant leak is detected in the first usage unit in the first indoor space. Therefore, the air conditioning system can suppress erroneous detection of a refrigerant leak in the second usage unit when a refrigerant leak is detected in the first usage unit.

[0007] An air conditioning system of a second aspect is the air conditioning system of the first aspect, wherein the control unit further performs a first notification control. The first notification control is a control for causing at least one of the second usage unit and a device connected to the second usage unit to notify the fact that a refrigerant leak has been detected in the first indoor space when the refrigerant sensor detects a refrigerant leak in the first usage unit.

[0008] An air conditioning system of a third aspect is the air conditioning system of the first or second aspect, in which the control unit is further connected to all of the utilization units installed in the first indoor space. The control unit further performs a second notification control. When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the second notification control is a control that causes at least one of all of the utilization units and devices connected to each of all of the utilization units to notify that a refrigerant leak has been detected in the first indoor space.

[0009] An air conditioning system according to a fourth aspect is the air conditioning system according to any one of the first aspect to the third aspect, wherein the control unit is further connected to a third usage unit that is a usage unit installed in a second indoor space that is an indoor space different from the first indoor space. When the refrigerant sensor detects a refrigerant leak in the first usage unit, the control unit further makes the third usage unit operable.

[0010] An air conditioning system of a fifth aspect is the air conditioning system of the fourth aspect, wherein the control unit further performs a third notification control. The third notification control is a control for causing at least one of the third usage unit and a device connected to the third usage unit to notify the fact that a refrigerant leak has been detected in the first indoor space when the refrigerant sensor detects a refrigerant leak in the first usage unit.

[0011] An air conditioning system of a sixth aspect is the air conditioning system of the fifth aspect, in which the control unit is further connected to all of the utilization units installed in the first indoor space. The control unit further performs a second notification control. The second notification control is a control for, when the refrigerant sensor detects a refrigerant leak in the first utilization unit, causing at least one of all of the utilization units and devices connected to each of all of the utilization units to notify that a refrigerant leak has been detected in the first indoor space. The control unit further performs a third notification control in at least one of a visual manner different from the visual manner of the second notification control, an auditory manner different from the auditory manner of the second notification control, and a tactile manner different from the tactile manner of the second notification control.

[0012] The air conditioning system of the seventh aspect is an air conditioning system of any one of the first aspect to the sixth aspect, in which a refrigerant that exchanges heat with the air of the first indoor space in the first usage unit and a refrigerant that exchanges heat with the air of the first indoor space in the second usage unit are heat exchanged with a fluid as a heat source in the first heat source unit.

[0013] An air conditioning system of an eighth aspect is the air conditioning system of any one of the first aspect to the seventh aspect, wherein the refrigerant that exchanges heat with the air of the first indoor space in the first usage unit exchanges heat with a fluid as a heat source in the first heat source unit, and the refrigerant that exchanges heat with the air of the first indoor space in the second usage unit exchanges heat with the fluid as a heat source in a second heat source unit that is a heat source unit different from the first heat source unit.

[0014] A control device of a ninth aspect controls a first usage unit and a second usage unit. The first usage unit is a usage unit that exchanges heat between a refrigerant and air in an indoor space, and is installed in a first indoor space, which is an indoor space in which a plurality of usage units are installed. The second usage unit is a usage unit installed in the first indoor space, and is different from the first usage unit. The control device includes a stop control unit. When a refrigerant sensor that detects refrigerant leakage in the first usage unit detects refrigerant leakage in the first usage unit, the stop control unit disables the second usage unit from operating. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic configuration diagram showing an air conditioning system 1. FIG. [Diagram 2] 1 is a schematic configuration diagram showing an air conditioning system 1. FIG. [Diagram 3] FIG. 2 is a control block diagram showing a control device 200. [Figure 4] 4 is a flowchart showing the operation of the air conditioning system 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (1) Overall structure An air conditioning system 1 of the present disclosure will be described. Figures 1 and 2 are schematic configuration diagrams showing the air conditioning system 1. The air conditioning system 1 is placed in a building B, and performs air conditioning of a first indoor space I1 and a second indoor space I2. Examples of air conditioning include cooling, refrigeration, heating, humidification, dehumidification, air purification, ventilation, etc.

[0017] The first indoor space I1 is a space provided in the building B, and is an indoor space in which a plurality of utilization units are installed. The second indoor space I2 is a space provided in the building B, and is an indoor space in which one utilization unit is installed. Note that the second indoor space I2 may be an indoor space in which a plurality of utilization units are installed.

[0018] The air conditioning system 1 includes a first refrigeration cycle apparatus 100A, a second refrigeration cycle apparatus 100B, and a control device 200. The first refrigeration cycle apparatus 100A and the control device 200 are electrically connected. The second refrigeration cycle apparatus 100B and the control device 200 are electrically connected.

[0019] The first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B perform air conditioning using a vapor compression refrigeration cycle. The second refrigeration cycle apparatus 100B may have a different function and configuration from the first refrigeration cycle apparatus 100A.

[0020] (2) Detailed configuration (2-1) First refrigeration cycle device 100A The first refrigeration cycle apparatus 100A has utilization units 110A, 110B, 110C, a heat source unit 120A, a gas side connecting pipe 131A, a liquid side connecting pipe 132A, a refrigerant sensor 160A, a refrigerant sensor 160B, a refrigerant sensor 160C, a remote control 171A, a remote control 171B, and a remote control 171C. The number of utilization units included in the first refrigeration cycle apparatus 100A is not limited to three, and may be one, two, or four or more.

[0021] The usage unit 110A is an example of a first usage unit. The usage unit 110A is installed in the first indoor space I1 and has a usage side flow path 111A. The usage unit 110B is an example of a second usage unit. The usage unit 110B is installed in the first indoor space I1 and has a usage side flow path 111B. The usage unit 110C is installed in the first indoor space I1 and has a usage side flow path 111C. The heat source unit 120A is an example of a first heat source unit. The heat source unit 120A has a heat source side flow path 121A.

[0022] The utilization side flow paths 111A, the utilization side flow paths 111B, the utilization side flow paths 111C, the heat source side flow paths 121A, the gas side connection pipe 131A, and the liquid side connection pipe 132A configure a refrigerant circuit 150A. The refrigerant circuit 150A is filled with refrigerant.

[0023] The refrigerant filled in the refrigerant circuit 150A is, but is not limited to, a fluorocarbon refrigerant such as R32, R410A, etc., which has a low flammability (A2L). The refrigerant may be flammable or toxic.

[0024] (2-1-1) Usage unit 110A The utilization unit 110A mainly includes a utilization side flow path 111A, a heat exchanger 112A, an expansion mechanism 113A, a gas side connection part 114A, and a liquid side connection part 115A.

[0025] The utilization side flow path 111A is formed by connecting a heat exchanger 112A and an expansion mechanism 113A via a refrigerant piping.

[0026] The heat exchanger 112A exchanges heat between the refrigerant flowing inside the heat exchanger 112A and the air in the first indoor space I1. The heat exchanger 112A functions as an evaporator of the refrigerant during cooling operation, and functions as a radiator of the refrigerant during heating operation. One end of the heat exchanger 112A is connected to the gas side connector 114A via a refrigerant pipe. The other end of the heat exchanger 112A is connected to the expansion mechanism 113A via a refrigerant pipe.

[0027] The expansion mechanism 113A adjusts the pressure and flow rate of the refrigerant flowing through the refrigerant circuit 150A. The expansion mechanism 113A is an electronic expansion valve whose opening is adjusted by an actuator (not shown). The expansion mechanism 113A is connected to the heat exchanger 112A and the liquid side connection part 115A via a refrigerant pipe. The opening of the expansion mechanism 113A is controlled by the control device 200.

[0028] The gas side connector 114A is one end of the utilization side flow passage 111 A. The gas side connector 114A is connected to the gas side communication pipe 131A.

[0029] The liquid side connector 115A is the other end of the utilization side flow path 111 A. The liquid side connector 115A is connected to the liquid side communication pipe 132A.

[0030] (2-1-2) Utilization units 110B, 110C The utilization unit 110B mainly includes a utilization side flow path 111B, a heat exchanger 112B, an expansion mechanism 113B, a gas side connection part 114B, and a liquid side connection part 115B. The utilization unit 110C mainly includes a utilization side flow path 111C, a heat exchanger 112C, an expansion mechanism 113C, a gas side connection part 114C, and a liquid side connection part 115C.

[0031] The utilization side flow paths 111B and 111C are similar to the utilization side flow paths 111A. The heat exchangers 112B and 112C are similar to the heat exchanger 112A. The expansion mechanism 113B and 113C are similar to the expansion mechanism 113A. The gas side connection parts 114B and 114C are similar to the gas side connection parts 114A. The liquid side connection parts 115B and 115C are similar to the liquid side connection parts 115A.

[0032] (2-1-3) Heat source unit 120A The heat source unit 120A is disposed outside the first indoor space I1. In this embodiment, the heat source unit 120A is disposed on the roof of the building B. The heat source unit 120A may be installed adjacent to the building B. The heat source unit 120A has a heat source side flow path 121A.

[0033] The heat source side flow path 121A is formed by connecting a compressor 122A, a heat exchanger 123A, an expansion mechanism 124A, a flow path switching mechanism 125A, a gas side connection part 126A, and a liquid side connection part 127A via a refrigerant pipe 121a. The refrigerant pipe 121a includes a first refrigerant pipe 121b, a second refrigerant pipe 121c, and a third refrigerant pipe 121d.

[0034] The compressor 122A draws in a low-pressure refrigerant in a refrigeration cycle from a suction pipe 122a, compresses the refrigerant with a compression mechanism (not shown), and discharges the compressed refrigerant to a discharge pipe 122b. The operation of the compressor 122A is controlled by the control device 200.

[0035] The heat exchanger 123A exchanges heat between the refrigerant flowing inside the heat exchanger 123A and the air (heat source air, the air of the outdoor room O in FIG. 1) at the installation location of the heat source unit 120A. In other words, the refrigerant that exchanges heat with the air of the first indoor space I1 in the utilization unit 110A, the refrigerant that exchanges heat with the air of the first indoor space I1 in the utilization unit 110B, and the refrigerant that exchanges heat with the air of the first indoor space I1 in the utilization unit 110C exchange heat with a fluid as a heat source in the heat exchanger 123A. The heat exchanger 123A functions as a refrigerant radiator during cooling operation and as a refrigerant evaporator during heating operation. One end of the heat exchanger 123A is connected to the flow path switching mechanism 125A via a refrigerant pipe. The other end of the heat exchanger 123A is connected to the expansion mechanism 124A via a refrigerant pipe.

[0036] The expansion mechanism 124A adjusts the pressure and flow rate of the refrigerant flowing through the refrigerant circuit 150A. The expansion mechanism 124A is an electronic expansion valve whose opening is adjusted by an actuator (not shown). The opening of the expansion mechanism 124A is controlled by the control device 200. The expansion mechanism 124A is connected to the heat exchanger 123A and the liquid side connection part 127A via a refrigerant piping.

[0037] The flow path switching mechanism 125A switches the flow direction of the refrigerant to change the state of the refrigerant circuit 150A between a first state and a second state. When the refrigerant circuit 150A is in the first state, the heat exchanger 123A functions as a radiator of the refrigerant, and the heat exchanger 112A functions as an evaporator of the refrigerant. When the refrigerant circuit 150A is in the second state, the heat exchanger 123A functions as an evaporator of the refrigerant, and the heat exchanger 112A functions as a radiator of the refrigerant. The flow path switching mechanism 125A is controlled by the control device 200. In this embodiment, the flow path switching mechanism 125A is a four-way switching valve. However, the flow path switching mechanism 125A is not limited to a four-way switching valve. For example, the flow path switching mechanism 125A may be configured by combining a plurality of solenoid valves and refrigerant pipes so as to realize switching of the flow direction of the refrigerant as described below.

[0038] During cooling operation, the flow path switching mechanism 125A sets the state of the refrigerant circuit 150A to a first state. In other words, during cooling operation, the flow path switching mechanism 125A connects the suction pipe 122a to the gas side connector 126A and connects the discharge pipe 122b to the heat exchanger 123A (see the dashed lines in the flow path switching mechanism 125A in FIG. 2). During heating operation, the flow path switching mechanism 125A sets the state of the refrigerant circuit 150A to a second state. In other words, during heating operation, the flow path switching mechanism 125A connects the suction pipe 122a to the heat exchanger 123A and connects the discharge pipe 122b to the gas side connector 126A (see the solid lines in the flow path switching mechanism 125A in FIG. 2).

[0039] The gas side connector 126A is one end of the heat source side flow passage 121 A. The gas side connector 126A is connected to a gas side communication pipe 131A.

[0040] The liquid side connector 127A is the other end of the heat source side flow path 121 A. The liquid side connector 127A is connected to a liquid side communication pipe 132A.

[0041] The first refrigerant pipe 121b connects the flow path switching mechanism 125A and the gas side connection part 126A. The second refrigerant pipe 121c connects the heat exchanger 123A and the expansion mechanism 124A. The third refrigerant pipe 121d connects the expansion mechanism 124A and the liquid side connection part 127A.

[0042] (2-1-4) Gas side connecting pipe 131A and liquid side connecting pipe 132A The gas side communication pipe 131A and the liquid side communication pipe 132A connect the utilization side flow passages 111A, 111B, 111C, and the heat source side flow passage 121A.

[0043] The gas side connection pipe 131A is connected to the gas side connection part 114A of the utilization side flow path 111A, the gas side connection part 114B of the utilization side flow path 111B, the gas side connection part 114C of the utilization side flow path 111C, and the gas side connection part 126A of the heat source side flow path 121A.

[0044] The utilization side flow paths 111A are connected to the liquid side connector 115A of the utilization side flow paths 111A and the liquid side connector 127A of the heat source side flow paths 121A. The utilization side flow paths 111B are connected to the liquid side connector 115B of the utilization side flow paths 111B and the liquid side connector 127A of the heat source side flow paths 121A. The utilization side flow paths 111C are connected to the liquid side connector 115C of the utilization side flow paths 111C and the liquid side connector 127A of the heat source side flow paths 121A.

[0045] (2-1-5) Refrigerant sensors 160A, 160B, 160C The refrigerant sensor 160A detects refrigerant leakage from the utilization side flow paths 111A. In other words, the refrigerant sensor 160A detects refrigerant leakage in the utilization unit 110A. The refrigerant sensor 160A is installed inside a casing (not shown) of the utilization unit 110A. The refrigerant sensor 160A is not limited in type as long as it can detect refrigerant leakage from the utilization side flow paths 111A, and may be a sensor that detects refrigerant, or may detect refrigerant leakage from a sudden change in air temperature or piping temperature inside the casing of the utilization unit 110A. The refrigerant sensor 160A may be installed outside the casing of the utilization unit 110A in a manner that allows it to detect refrigerant leakage from the utilization side flow paths 111A.

[0046] When the refrigerant sensor 160A detects a refrigerant leak, it transmits first detection information to the control device 200. The first detection information is information that indicates that a refrigerant leak has been detected in the utilization unit 110A.

[0047] The refrigerant sensor 160B detects refrigerant leakage from the usage side flow paths 111B. In other words, the refrigerant sensor 160B detects refrigerant leakage in the usage unit 110B. The refrigerant sensor 160B is installed inside a casing (not shown) of the usage unit 110B. The refrigerant sensor 160B may be a sensor that detects refrigerant, or may detect refrigerant leakage from a sudden change in air temperature or piping temperature inside the casing of the usage unit 110B. The refrigerant sensor 160B may be installed outside the casing of the usage unit 110B in a manner that allows it to detect refrigerant leakage from the usage side flow paths 111B.

[0048] When the refrigerant sensor 160B detects a refrigerant leak, it transmits second detection information to the control device 200. The second detection information is information that indicates that a refrigerant leak has been detected in the utilization unit 110B.

[0049] The refrigerant sensor 160C detects refrigerant leakage from the utilization side flow paths 111C. In other words, the refrigerant sensor 160C detects refrigerant leakage in the utilization unit 110C. The refrigerant sensor 160C is installed inside a casing (not shown) of the utilization unit 110C. The refrigerant sensor 160C is not limited in type as long as it can detect refrigerant leakage from the utilization side flow paths 111C, and may be a sensor that detects refrigerant, or may detect refrigerant leakage from a sudden change in air temperature or piping temperature inside the casing of the utilization unit 110C. The refrigerant sensor 160C may be installed outside the casing of the utilization unit 110C in a manner that allows it to detect refrigerant leakage from the utilization side flow paths 111C.

[0050] When the refrigerant sensor 160C detects a refrigerant leak, it transmits third detection information to the control device 200. The third detection information is information that indicates that a refrigerant leak has been detected in the utilization unit 110C.

[0051] (2-1-6) Remote Control 171A, 171B, 171C The remote control 171A is a device that is connected to the usage unit 110A by wire or wirelessly. The remote control 171A controls the air conditioning of the usage unit 110A. In this embodiment, the remote control 171A is fixed to a wall of the first indoor space I1. The remote control 171A may be a mobile terminal that is not fixed to the wall of the first indoor space I1.

[0052] When the refrigerant sensor 160A detects a refrigerant leak in the utilization unit 110A, the remote control 171A notifies the user that a refrigerant leak has been detected in the first indoor space I1. The remote control 171A notifies the user in at least one of a visual manner, an auditory manner, and a tactile manner. An example of the visual manner is a manner in which a message is displayed on a display device (not shown) included in the remote control 171A. An example of the auditory manner is a manner in which the remote control 171A outputs a sound from a speaker (not shown) included in the remote control 171A. An example of the tactile manner is a manner in which the remote control 171A vibrates.

[0053] The remote control 171B is a device that is connected to the usage unit 110B by wire or wirelessly. The remote control 171B controls the air conditioning of the usage unit 110B. In this embodiment, the remote control 171B is fixed to a wall of the first indoor space I1. The remote control 171B may be a mobile terminal that is not fixed to the wall of the first indoor space I1.

[0054] When the refrigerant sensor 160A detects a refrigerant leak in the utilization unit 110A, the remote control 171B notifies the user that a refrigerant leak has been detected in the first indoor space I1. When the refrigerant sensor 160B detects a refrigerant leak in the utilization unit 110B, the remote control 171B also notifies the user that a refrigerant leak has been detected in the first indoor space I1. The remote control 171B notifies the user in at least one of a visual manner, an auditory manner, and a tactile manner. An example of the visual manner is a manner in which a message is displayed on a display device (not shown) included in the remote control 171B. An example of the auditory manner is a manner in which the remote control 171B outputs a sound from a speaker (not shown) included in the remote control 171B. An example of the tactile manner is a manner in which the remote control 171B vibrates.

[0055] The remote control 171C is a device that is connected to the usage unit 110C by wire or wirelessly. The remote control 171C controls the air conditioning of the usage unit 110C. In this embodiment, the remote control 171C is fixed to a wall of the first indoor space I1. The remote control 171C may be a mobile terminal that is not fixed to the wall of the first indoor space I1.

[0056] When the refrigerant sensor 160A detects a refrigerant leak in the utilization unit 110A, the remote control 171C notifies the user that a refrigerant leak has been detected in the first indoor space I1. When the refrigerant sensor 160C detects a refrigerant leak in the utilization unit 110C, the remote control 171C also notifies the user that a refrigerant leak has been detected in the first indoor space I1. The remote control 171C notifies the user in at least one of a visual manner, an auditory manner, and a tactile manner. An example of the visual manner is a manner in which a message is displayed on a display device (not shown) included in the remote control 171C. An example of the auditory manner is a manner in which the remote control 171C outputs a sound from a speaker (not shown) included in the remote control 171C. An example of the tactile manner is a manner in which the remote control 171C vibrates.

[0057] (2-2) Second refrigeration cycle device 100B The second refrigeration cycle apparatus 100B has a utilization unit 110D, a heat source unit 120B, a gas side connection pipe 131B, a liquid side connection pipe 132B, a refrigerant sensor 160D, and a remote control 171D. The number of utilization units included in the second refrigeration cycle apparatus 100B is not limited to one, and may be two or more.

[0058] The utilization unit 110D is an example of a third utilization unit. The utilization unit 110D is installed in the second indoor space I2, and has a utilization side flow path 111D. The heat source unit 120B has a heat source side flow path 121B.

[0059] The utilization side flow paths 111D, the heat source side flow paths 121B, the gas side communication pipe 131B, and the liquid side communication pipe 132B configure a refrigerant circuit 150B. The refrigerant circuit 150B is filled with refrigerant.

[0060] The refrigerant filled in the refrigerant circuit 150B is, but is not limited to, a fluorocarbon refrigerant R such as R32 or R410A having a low flammability (A2L). The refrigerant may be flammable or toxic.

[0061] (2-2-1) Unit 110D The utilization unit 110D mainly includes a utilization side flow path 111D, a heat exchanger 112D, an expansion mechanism 113D, a gas side connection part 114D, and a liquid side connection part 115D.

[0062] The utilization unit 110D is similar to the utilization side flow path 111A. The heat exchanger 112D is similar to the heat exchanger 112A. The expansion mechanism 113D is similar to the expansion mechanism 113A. The gas side connection 114D is similar to the gas side connection 114A. The liquid side connection 115D is similar to the liquid side connection 115A.

[0063] (2-2-2) Heat source unit 120B The heat source unit 120B is disposed outside the second indoor space I2. In this embodiment, the heat source unit 120B is disposed on the roof of the building B. The heat source unit 120B may be installed adjacent to the building B. The heat source unit 120B has a heat source side flow path 121B. The configuration and function of the heat source side flow path 121B are similar to the configuration and function of the heat source side flow path 121A.

[0064] The refrigerant that exchanges heat with the air in the second indoor space I2 in the utilization unit 110D exchanges heat with a fluid that serves as a heat source in the heat exchanger 123B.

[0065] (2-2-3) Gas side connecting pipe 131B and liquid side connecting pipe 132B The gas side communication pipe 131B and the liquid side communication pipe 132B connect the utilization side flow passage 111D and the heat source side flow passage 121B.

[0066] The gas side communication pipe 131B is connected to the gas side connector 114D of the utilization side passage 111D and the gas side connector 126B of the heat source side passage 121B.

[0067] The utilization side flow paths 111D are connected to a liquid side connector 115D of the utilization side flow paths 111D and a liquid side connector 127B of the heat source side flow paths 121B.

[0068] (2-2-4) Refrigerant sensor 160D The refrigerant sensor 160D detects refrigerant leakage from the utilization side flow paths 111D. In other words, the refrigerant sensor 160D detects refrigerant leakage in the utilization unit 110D. The refrigerant sensor 160D is installed inside a casing (not shown) of the utilization unit 110D. The refrigerant sensor 160D is not limited in type as long as it can detect refrigerant leakage from the utilization side flow paths 111D, and may be a sensor that detects refrigerant, or may detect refrigerant leakage from a sudden change in air temperature or piping temperature inside the casing of the utilization unit 110D. The refrigerant sensor 160D may be installed outside the casing of the utilization unit 110D in a manner that allows it to detect refrigerant leakage from the utilization side flow paths 111D.

[0069] When the refrigerant sensor 160D detects a refrigerant leak, it transmits fourth detection information to the control device 200. The fourth detection information is information that indicates that a refrigerant leak has been detected in the utilization unit 110D.

[0070] (2-2-5) Remote Control 171D The remote control 171D is a device that is connected to the usage unit 110D by wire or wirelessly. The remote control 171D controls the air conditioning of the usage unit 110D. In this embodiment, the remote control 171D is fixed to a wall of the second indoor space I2. The remote control 171D may be a mobile terminal that is not fixed to the wall of the second indoor space I2.

[0071] When the refrigerant sensor 160A detects a refrigerant leak in the utilization unit 110A, the remote control 171D notifies the user that a refrigerant leak has been detected in the first indoor space I1. When the refrigerant sensor 160D detects a refrigerant leak in the utilization unit 110D, the remote control 171D also notifies the user that a refrigerant leak has been detected in the second indoor space I2. The remote control 171D notifies the user in at least one of a visual manner, an auditory manner, and a tactile manner. An example of the visual manner is a manner in which a message is displayed on a display device (not shown) included in the remote control 171D. An example of the auditory manner is a manner in which the remote control 171D outputs a sound from a speaker (not shown) included in the remote control 171D. An example of the tactile manner is a manner in which the remote control 171D vibrates.

[0072] (2-3) Control device 200 The control device 200 controls the operation of each part constituting the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B. The control device 200 is electrically connected to the expansion mechanisms 113A-D, the refrigerant sensors 116A-D, the compressors 122A-B, the expansion mechanisms 124A-B, and the flow path switching mechanisms 125A-B so as to be able to exchange control signals and information with them.

[0073] For example, when the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B are installed in a building B and undergo a test run, the control device 200 is connected to the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B. Note that the control device 200 may be retrofitted to the already installed first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B, and the control device 200 may be connected to the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B.

[0074] 3 is a control block diagram of the control device 200. The control device 200 is an example of a control unit. The control device 200 has an air conditioning control unit 201, a receiving unit 202, a stop control unit 203, a continuation control unit 204, and a notification control unit 205.

[0075] The control device 200 is realized by a computer. The control device 200 includes a control arithmetic device and a storage device. A processor such as a CPU or a GPU can be used for the control arithmetic device. The control arithmetic device reads out a program stored in the storage device, and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic device can write the results of calculations to the storage device and read out information stored in the storage device according to the program. Figure 3 shows various functional blocks realized by the control arithmetic device. The storage device can be used as a database.

[0076] The control device 200 may be provided separately for each of the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B. In this case, the control device of the first refrigeration cycle apparatus 100A and the control device of the second refrigeration cycle apparatus 100B transmit and / or receive control signals, measurement signals, signals related to various settings, etc., via communication lines. In the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B, the control device 200 may be provided separately for each utilization unit and for each heat source unit. In this case, the control device provided for each utilization unit and the control device provided for the heat source unit transmit and / or receive control signals, measurement signals, signals related to various settings, etc., via communication lines.

[0077] (2-3-1) Air conditioning control unit 201 The air conditioning control unit 201 controls the air conditioning of the first refrigeration cycle apparatus 100A and the second refrigeration cycle apparatus 100B.

[0078] (2-3-2) Reception desk 202 When refrigerant sensor 160A detects a refrigerant leak in utilization unit 110A, the receiving unit 202 receives first detection information from refrigerant sensor 160A. When refrigerant sensor 160B detects a refrigerant leak in utilization unit 110B, the receiving unit 202 receives second detection information from refrigerant sensor 160B. When refrigerant sensor 160C detects a refrigerant leak in utilization unit 110C, the receiving unit 202 receives third detection information from refrigerant sensor 160C. When refrigerant sensor 160D detects a refrigerant leak in utilization unit 110D, the receiving unit 202 receives fourth detection information from refrigerant sensor 160D.

[0079] (2-3-3) Stop control unit 203 When the reception unit 202 receives the first detection information, the stop control unit 203 disables the utilization units 110A, 110B, and 110C. "Disabling the utilization units" means "disabling the utilization units from flowing in." Specific examples of "disabling the utilization units" include stopping the utilization units when they are in operation, and preventing the utilization units from starting operation when they are not in operation.

[0080] When the reception unit 202 receives the second detection information, the stop control unit 203 disables the utilization unit 110B. When the reception unit 202 receives the third detection information, the stop control unit 203 disables the utilization unit 110C. When the reception unit 202 receives the fourth detection information, the stop control unit 203 disables the utilization unit 110D.

[0081] (2-3-4) Continuation control unit 204 When the reception unit 202 receives the first detection information, the continuation control unit 204 makes the utilization unit 110D in an operable state. "Making the utilization unit in an operable state" means "making the utilization unit in a state in which the refrigerant flows in." Specific examples of "making the utilization unit in an operable state" include continuing the operation of the utilization unit when the utilization unit is in operation, and allowing the utilization unit to start operation when the utilization unit is not in operation.

[0082] (2-3-5) Notification control unit 205 When the reception unit 202 receives the first detection information, the notification control unit 205 causes the remote control 171A, the remote control 171B, and the remote control 171C to notify that a refrigerant leak has been detected in the first indoor space I1. In other words, the notification control unit 205 causes devices connected to all of the utilization units installed in the first indoor space I1 to notify. Note that when the reception unit 202 receives the first detection information, the notification control unit 205 may cause the utilization unit 110A, the utilization unit 110B, and the utilization unit 110C to notify that a refrigerant leak has been detected in the first indoor space I1. In other words, the notification control unit 205 may cause all of the utilization units installed in the first indoor space I1 to notify.

[0083] Here, "causing at least one of the utilization unit 110B and the device connected to the utilization unit 110B to notify that a refrigerant leak has been detected in the first indoor space I1" is referred to as first notification control. Here, "causing at least one of all utilization units installed in the first indoor space I1 and the devices connected to each of all utilization units installed in the first indoor space I1 to notify that a refrigerant leak has been detected in the first indoor space I1" is referred to as second notification control. The notification control unit 205 performs the first notification control and the second notification control.

[0084] When the receiving unit 202 receives the first detection information, the notification control unit 205 causes the remote control 171D to notify that a refrigerant leak has been detected in the first indoor space I1. In other words, the notification control unit 205 causes a device connected to the utilization unit 110D to notify. Note that when the receiving unit 202 receives the first detection information, the notification control unit 205 may cause the utilization unit 110D to notify that a refrigerant leak has been detected in the first indoor space I1. Here, "causing at least one of the utilization unit 110D and the device connected to the utilization unit 110D to notify that a refrigerant leak has been detected in the first indoor space I1" is referred to as third notification control. The notification control unit 205 performs the third notification control.

[0085] The third notification control is performed in at least one of a visual mode different from the visual mode of the second notification control, an auditory mode different from the auditory mode of the second notification control, and a tactile mode different from the tactile mode of the second notification control. Examples of the visual mode include a mode in which a message is displayed on a display device of the remote control, and a mode in which a lamp or the like of the remote control is turned on. Examples of the auditory mode include a mode in which a sound is output from a speaker of the remote control, and a mode in which the remote control is vibrated as a tactile mode.

[0086] (3) Operation The operation of the air conditioning system 1 in the case where refrigerant leaks from the utilization unit 110A will be described. It is assumed that the utilization units 110A, 110B, and 110D are in operation. It is assumed that the utilization unit 110C is not in operation. FIG. 4 is a flowchart showing the operation of the air conditioning system 1.

[0087] The refrigerant sensor 160A detects a refrigerant leak in the utilization unit 110A (step S1). The refrigerant sensor 160A transmits first detection information to the control device 200 (step S2). The receiving unit 202 receives the first detection information from the refrigerant sensor 160A (step S3).

[0088] The stop control unit 203 sets the utilization unit 110A, utilization unit 110B, and utilization unit 110C in an inoperable state (step S4). The utilization unit 110A in operation and the utilization unit 110B in operation are stopped from operation. The utilization unit 110C that is not in operation is prevented from starting operation.

[0089] The continuation control unit 204 puts the utilization unit 110D into an operable state (step S5). The utilization unit 110D that is in operation is allowed to continue operating.

[0090] The notification control unit 205 causes the remote controls 171A, 171B, 171C, and 171D to notify that a refrigerant leak has been detected in the first indoor space I1 (step S6). The remote controls 171A, 171B, and 171C notify that a refrigerant leak has been detected in the first indoor space I1 in a manner different from that of the remote control 171D.

[0091] (4) Features (4-1) The air conditioning system 1 includes a first usage unit 110A, a second usage unit 110B, a first heat source unit 120A, a control device 200 as a control unit, and a refrigerant sensor 160A. The first usage unit 110A is a usage unit that exchanges heat between a refrigerant and the air in an indoor space, and is installed in a first indoor space I1, which is an indoor space in which a plurality of usage units are installed. The second usage unit 110B is a usage unit that is installed in the first indoor space I1, and is different from the first usage unit 110A. The first heat source unit 120A is a heat source unit that configures a refrigerant circuit 150A together with the usage units. The control device 200 controls the first usage unit 110A and the second usage unit 110B. The refrigerant sensor 160A detects leakage of refrigerant in the first usage unit 110A. When the refrigerant sensor 160A detects a refrigerant leak in the first usage unit 110A, the control device 200 places the second usage unit 110B in an inoperable state.

[0092] A refrigerant sensor is installed to detect refrigerant leakage in a utilization unit. If refrigerant leaks in a utilization unit, the leaked refrigerant will spread to the surroundings due to air currents. The spread refrigerant may be detected by other refrigerant sensors that detect refrigerant leakage in other utilization units. When refrigerant leaks in one utilization unit, a refrigerant leakage is detected by a refrigerant sensor in another utilization unit where there is no actual refrigerant leakage, this is called a false detection.

[0093] A service engineer who responds to refrigerant leaks must respond to the utilization unit in which a refrigerant leak was detected, including false positives. In other words, the service engineer must also respond to other utilization units that are not leaking refrigerant. Therefore, when a refrigerant leak occurs in a utilization unit, false positives result in unnecessary time and cost being wasted in responding to the refrigerant leak.

[0094] The air conditioning system 1 includes a control device 200 that, when a refrigerant leak is detected in the first usage unit 110A of the first indoor space I1, disables the second usage unit 110B of the first indoor space I1. Because the second usage unit 110B is disabled, the second usage unit 110B is prevented from sucking in and blowing out air. In other words, the leaked refrigerant is prevented from reaching the refrigerant sensor 160B that detects a refrigerant leak in the second usage unit 110B. Therefore, the air conditioning system 1 can suppress erroneous detection.

[0095] Furthermore, if the operation of the refrigerant sensor is linked to the operation of the usage unit, then if the second usage unit 110B is in an inoperable state, the refrigerant sensor 160B that detects refrigerant leakage in the second usage unit 110B also stops operating. Therefore, the air conditioning system 1 can suppress erroneous detection.

[0096] (4-2) In the air conditioning system 1, the control device 200 further performs a first notification control. The first notification control is a control for causing at least one of the second usage unit 110B and a device connected to the second usage unit 110B to notify the fact that a refrigerant leak has been detected in the first indoor space I1 when the refrigerant sensor 160A detects a refrigerant leak in the first usage unit 110A.

[0097] If a refrigerant leaks from a utilization unit, the leaked refrigerant will spread to the surroundings due to air currents. The leaked refrigerant will also spread to other utilization units in the same indoor space as the utilization unit. Therefore, it is necessary to notify the refrigerant leak not only to the user of the utilization unit from which the refrigerant leaked, but also to the users of the other utilization units.

[0098] The air conditioning system 1 further performs a first notification control. Therefore, the air conditioning system 1 can notify the user of the second usage unit 110B, who may be affected by the leaking refrigerant, of the refrigerant leakage.

[0099] (4-3) In the air conditioning system 1, the control device 200 is further connected to all of the utilization units installed in the first indoor space I1. The control device 200 further performs a second notification control. When the refrigerant sensor 160A detects a refrigerant leak in the first utilization unit 110A, the second notification control causes at least one of all of the utilization units and devices connected to each of the utilization units to notify that a refrigerant leak has been detected in the first indoor space I1.

[0100] If a refrigerant leaks from a utilization unit, the leaked refrigerant will spread to the surroundings due to air currents. The leaked refrigerant will spread not only around the utilization unit, but also throughout the indoor space the utilization unit is installed in. For this reason, it is necessary to notify the refrigerant leak not only to the user of the utilization unit from which the refrigerant leaked, but also to the indoor space in question.

[0101] The air conditioning system 1 further performs a second notification control. Therefore, the air conditioning system 1 can notify users of all utilization units installed in the same indoor space that may be affected by the leaking refrigerant of the refrigerant leakage.

[0102] (4-4) In the air conditioning system 1, the control device 200 is further connected to a third usage unit 110D, which is a usage unit installed in a second indoor space I2, which is an indoor space different from the first indoor space I1. The control device 200 further makes the third usage unit 110D operable when the refrigerant sensor 160A detects a refrigerant leak in the first usage unit 110A.

[0103] In the event of a refrigerant leak, it may be necessary to stop the operation of other utilization units connected to the control device for safety reasons. However, indoor spaces other than the indoor space in which the utilization unit with the leaked refrigerant is installed are less likely to be affected by the leaked refrigerant.

[0104] When the refrigerant sensor 160A detects a refrigerant leak in the first usage unit 110A, the air conditioning system 1 places the third usage unit 110D in an operable state. Therefore, the air conditioning system 1 can ensure the safety of the first indoor space I1 without reducing the convenience of the user in the second indoor space I2.

[0105] (4-5) In the air conditioning system 1, the control device 200 further performs third notification control. The third notification control is a control for causing at least one of the third usage unit 110D and a device connected to the third usage unit 110D to notify the fact that a refrigerant leak has been detected in the first indoor space I1 when the refrigerant sensor 160A detects a refrigerant leak in the first usage unit 110A.

[0106] When a refrigerant leaks in an indoor space, it is possible that there may be no user in the indoor space where the leak occurred, so it is desirable to notify other indoor spaces of the refrigerant leak in order to take immediate measures. Also, for example, if the utilization units installed in the other indoor spaces are in the same system as the utilization unit installed in the indoor space where the refrigerant leaked, stopping the operation of the utilization unit installed in the indoor space where the refrigerant leaked will also affect the operating capacity of the utilization units installed in the other indoor spaces.

[0107] The air conditioning system 1 further performs a third notification control. Therefore, the air conditioning system 1 can notify the user of the second indoor space I2, who may be affected by the refrigerant leakage from the first usage unit 110A, of the refrigerant leakage.

[0108] (4-6) In the air conditioning system 1, the control device 200 is further connected to all the utilization units installed in the first indoor space I1. The control device 200 further performs a second notification control. When the refrigerant sensor 160A detects a refrigerant leak in the first utilization unit 110A, the second notification control causes at least one of all the utilization units and devices connected to each of all the utilization units to notify that a refrigerant leak has been detected in the first indoor space I1. The control device 200 further performs a third notification control in at least one of a visual manner different from the visual manner of the second notification control, an auditory manner different from the auditory manner of the second notification control, and a tactile manner different from the tactile manner of the second notification control.

[0109] When the refrigerant sensor detects a refrigerant leak in an indoor space, the refrigerant leak may be reported in at least one of a visual manner, an auditory manner, and a tactile manner. In addition, in consideration of the safety of the user, refrigerant leaks in other indoor spaces may also be reported. However, the response required for the indoor space where the refrigerant has leaked is different from the response required for other indoor spaces where the refrigerant is not leaking. Therefore, when a refrigerant leak is reported in a similar manner, it is not possible to distinguish between the response required for the indoor space where the refrigerant has leaked and the response required for other indoor spaces where the refrigerant is not leaking, which may reduce the efficiency of the response.

[0110] The air conditioning system 1 performs the third alert control in at least one of a visual manner different from the second alert control, an auditory manner different from the second alert control, and a tactile manner different from the second alert control. Therefore, the air conditioning system 1 can improve the efficiency of the user's response in the event of a refrigerant leak.

[0111] (4-7) In the air conditioning system 1, a refrigerant that exchanges heat with the air of the first indoor space I1 in the first usage unit 110A and a refrigerant that exchanges heat with the air of the first indoor space I1 in the second usage unit 110B exchange heat with a fluid as a heat source in the first heat source unit 120A.

[0112] The first usage unit 110A and the second usage unit 110B are so-called usage units of the same system. Therefore, the air conditioning system 1 can suppress erroneous detection of a refrigerant leak in the first usage unit 110A in the second usage unit 110B of the same system.

[0113] (4-8) The control device 200 controls the first usage unit 110A and the second usage unit 110B. The first usage unit 110A is a usage unit that exchanges heat between a refrigerant and the air in an indoor space, and is installed in a first indoor space I1, which is an indoor space in which a plurality of usage units are installed. The second usage unit 110B is a usage unit installed in the first indoor space I1, and is different from the first usage unit 110A. The control device 200 includes a stop control unit 203. When a refrigerant leak in the first usage unit 110A is detected by a refrigerant sensor 160A that detects a refrigerant leak in the first usage unit 110A, the stop control unit 203 disables the second usage unit 110B.

[0114] Therefore, the control device 200 can suppress erroneous detection in which a refrigerant leak in the second usage unit 110B is detected when a refrigerant leak in the first usage unit 110A occurs.

[0115] (5) Variations (5-1) Variation 1A (5-1-1) Configuration The air conditioning system 1 may further include a heat source unit 120C. The heat source unit 120C is an example of a second heat source unit. The heat source unit 120C has the same configuration and the same function as the heat source unit 120A.

[0116] The refrigerant that exchanges heat with the air in the first indoor space I1 in the utilization unit 110B exchanges heat with a fluid as a heat source in the heat source unit 120C instead of the heat source unit 120A. In other words, the utilization unit 110A and the utilization unit 110B are so-called utilization units of different systems.

[0117] (5-1-2) Features In the air conditioning system 1, the refrigerant that exchanges heat with the air in the first indoor space I1 in the first usage unit 110A exchanges heat with a fluid as a heat source in the first heat source unit 120A. The refrigerant that exchanges heat with the air in the first indoor space I1 in the second usage unit 110B exchanges heat with a fluid as a heat source in the second heat source unit 120B, which is a heat source unit different from the first heat source unit 120A.

[0118] Therefore, the air conditioning system 1 can suppress erroneous detection in the second usage unit 110B of a different system when there is a refrigerant leak in the first usage unit 110A.

[0119] (5-2) Variation 1B When the receiving unit 202 receives the first detection information, the stop control unit 203 may disable all of the refrigerant sensors installed in the first indoor space I1.

[0120] To ensure the safety of users, the operation of the utilization unit and the refrigerant sensor may not be linked. When a refrigerant leak is detected in the utilization unit 110A, the stop control unit 203 disables all the refrigerant sensors installed in the first indoor space I1. Therefore, the air conditioning system 1 can suppress false detection.

[0121] Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims. [Explanation of symbols]

[0122] 1. Air conditioning system 110A First User Unit 110B Second user unit 110D 3rd User Unit 120A First heat source unit 120B Second heat source unit 150A refrigerant circuit 160A Refrigerant Sensor 200 Control device (control unit) 203 Stop control section I1 1st indoor space I2 2nd interior space [Prior art documents] [Patent documents]

[0123] [Patent Document 1] JP 2023-119146 A

Claims

1. A first utilization unit (110A) which is a utilization unit that exchanges heat between a refrigerant and air in an indoor space and is installed in a first indoor space (I1) which is an indoor space in which a plurality of the utilization units are installed; A second usage unit (110B) that is different from the first usage unit and is installed in the first indoor space; A first heat source unit (120A) which is a heat source unit constituting a refrigerant circuit (150A) together with the utilization unit; A control unit (200) that controls the first utilization unit and the second utilization unit; A refrigerant sensor (160A) that detects leakage of a refrigerant in the first utilization unit; Equipped with the control unit, when the refrigerant sensor detects a refrigerant leak in the first utilization unit, disables the second utilization unit. Air conditioning system (1).

2. The control unit further includes: When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the refrigerant sensor detects that a refrigerant leak has been detected in the first indoor space. performing a first notification control to cause at least one of the second usage unit and a device connected to the second usage unit to notify the user; The air conditioning system of claim 1 .

3. The control unit further includes: Connected to all of the utilization units installed in the first indoor space, When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the refrigerant sensor detects that a refrigerant leak has been detected in the first indoor space. A second notification control is performed to cause at least one of all of the utilization units and devices connected to each of the utilization units to notify the user.

3. The air conditioning system according to claim 2.

4. The control unit further includes: The third utilization unit (110D) is connected to the utilization unit installed in a second indoor space (I2) which is an indoor space different from the first indoor space, When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the third utilization unit is made operable.

3. An air conditioning system according to claim 1 or 2.

5. The control unit further includes: When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the refrigerant sensor detects that a refrigerant leak has been detected in the first indoor space. and performing a third notification control to cause at least one of the third usage unit and a device connected to the third usage unit to notify the user.

5. The air conditioning system according to claim 4.

6. The control unit further includes: Connected to all of the utilization units installed in the first indoor space, When the refrigerant sensor detects a refrigerant leak in the first utilization unit, the refrigerant sensor detects that a refrigerant leak has been detected in the first indoor space. performing a second notification control to cause at least one of all of the utilization units and devices connected to each of the utilization units to notify; The third notification control, a visual aspect different from the visual aspect of the second notification control; an auditory manner different from the auditory manner of the second notification control; a tactile aspect different from the tactile aspect of the second notification control; At least one of the following is performed:

6. The air conditioning system according to claim 5.

7. a refrigerant that exchanges heat with the air in the first indoor space in the first utilization unit; a refrigerant that exchanges heat with the air in the first indoor space in the second utilization unit; is heat exchanged with a fluid as a heat source in the first heat source unit; 3. An air conditioning system according to claim 1 or 2.

8. The refrigerant that exchanges heat with the air in the first indoor space in the first utilization unit exchanges heat with a fluid that serves as a heat source in the first heat source unit, The refrigerant that exchanges heat with the air in the first indoor space in the second utilization unit exchanges heat with a fluid as a heat source in a second heat source unit (120B) that is a heat source unit different from the first heat source unit.

3. An air conditioning system according to claim 1 or 2.

9. A first utilization unit that exchanges heat between a refrigerant and air in an indoor space, the first utilization unit being installed in a first indoor space that is an indoor space in which a plurality of the utilization units are installed; A second utilization unit that is installed in the first indoor space and is different from the first utilization unit; A control device (200) for controlling a stop control unit (203) that disables the second usage unit when a refrigerant leak in the first usage unit is detected by a refrigerant sensor that detects a refrigerant leak in the first usage unit; A control device comprising:

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