Inspection method for refrigeration and air conditioning management systems and shut-off valves

Abstract

This invention provides a refrigeration and air conditioning management system and a method for inspecting shut-off valves that can inspect shut-off valves regardless of the detected value from a flow sensor. [Solution] The refrigeration and air conditioning management system comprises a refrigeration and air conditioning device 1 including one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, and a shut-off valve inspection device 6 that performs control to close a first shut-off valve to be inspected, and after the closing control of the first shut-off valve, determines whether the first shut-off valve is normal based on a first detected value of the temperature sensor of the first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating.

Description

Technical Field

[0001] The present disclosure relates to a refrigeration and air-conditioning management system and a method for inspecting a shut-off valve of a refrigeration and air-conditioning management system.

Background Art

[0002] Conventionally, in a refrigerating or air-conditioning device such as an air conditioner or a refrigerator, in order to detect leakage of a refrigerant from the refrigerating or air-conditioning device, it is known to provide a refrigerant leakage detection device. For example, in Patent Document 1, it is described that the presence or absence of refrigerant leakage is determined from the refrigerant concentration detected by a sensor, and when it is determined that the refrigerant is leaking, an alarm sound is emitted from an alarm buzzer, a shut-off valve is closed to block the flow of the refrigerant, and a ventilation fan is rotated to reduce the refrigerant concentration in the room. In order to achieve the above when refrigerant leakage occurs, it is necessary to periodically inspect whether the shut-off valve operates normally.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the shut-off valve is inspected from the measured value of a flow rate sensor. Installing the flow rate sensor individually increases the cost of the air conditioner.

[0005] Therefore, an object of the present disclosure is to provide a refrigeration and air-conditioning management system and a method for inspecting a shut-off valve that can inspect the shut-off valve regardless of the detection value of a flow rate sensor.

Means for Solving the Problems

[0006] The refrigeration and air conditioning management system of this disclosure includes a refrigeration and air conditioning system including one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, and a shut-off valve inspection device that performs control to close a first shut-off valve to be inspected, and after the closing control of the first shut-off valve, determines whether the first shut-off valve is normal based on a first detected value of the temperature sensor of the first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating. [Effects of the Invention]

[0007] According to this disclosure, the shut-off valve can be inspected regardless of the detected value from the flow sensor. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram illustrating the configuration of a building management system. [Figure 2] This is a diagram showing the configuration of the refrigeration and air conditioning system 1. [Figure 3] This is a flowchart illustrating the inspection procedure for the first shut-off valves 25a and 26a of Embodiment 1. [Figure 4] This is a flowchart illustrating the inspection procedure for the first shut-off valves 25a and 26a of Embodiment 2. [Figure 5] This is a diagram showing the configuration of the refrigeration and air conditioning system 1 according to Embodiment 3. [Figure 6] This is a flowchart illustrating the inspection procedure for the first shut-off valves 25a and 26a of Embodiment 3. [Figure 7] This diagram shows the hardware configuration of the shut-off valve inspection device 6. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a diagram illustrating the configuration of a building management system.

[0010] The building management system includes a refrigeration and air-conditioning management system 100, a system controller 7, a device information management system 9, and a remote monitoring device 8.

[0011] The refrigeration and air-conditioning management system 100 includes a refrigeration and air-conditioning device and manages the refrigeration and air-conditioning device. The system controller 7 controls the refrigeration and air-conditioning management system 100.

[0012] The device information management system 9 manages the status of facilities in the building such as the refrigeration and air-conditioning device 1. The remote monitoring device 8 remotely monitors facilities in the building such as the refrigeration and air-conditioning device 1.

[0013] The refrigeration and air-conditioning management system 100 includes a refrigeration and air-conditioning device 1, a measurement and control unit 5, and a shut-off valve inspection device 6.

[0014] The refrigeration and air-conditioning device 1 includes one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor unit and the outdoor unit.

[0015] The measurement and control unit 5 controls the devices of the refrigeration and air-conditioning device 1 and measures the status of the refrigeration and air-conditioning device 1. The shut-off valve inspection device 6 includes an input unit 601, a measurement unit 602, a determination unit 603, a determination value recording unit 604, an output unit 605, a display setting unit 606, a device information recording unit 607, and a notification unit 608. The input unit 601 inputs temperature data from the measurement and control unit 5. The measurement unit 602 counts the processing time. The determination unit 603 determines whether the shut-off valve is normal based on the temperature data. The determination value recording unit 604 records the determination result. The output unit 605 outputs the determination result. The display setting unit 606 sets the display content of the determination result. The device information recording unit 607 records the display content of the determination result. The notification unit 608 notifies the determination result.

[0016] Figure 2 is a diagram showing the configuration of the refrigeration and air-conditioning device 1. In Figure 2, two indoor units 20a and 20b are shown, but the number of indoor units may be one or more.

[0017] The refrigeration and air conditioning apparatus 1 includes an outdoor unit 10, a first indoor unit 20a and a second indoor unit 20b, a first liquid shut-off valve 25a and a first gas shut-off valve 26a for shutting off the connection between the outdoor unit 10 and the first indoor unit 20a, a second liquid shut-off valve 25b and a second gas shut-off valve 26b for shutting off the connection between the outdoor unit 10 and the second indoor unit 20b, and a liquid pipe 41 and a gas pipe 42 connecting the outdoor unit 10 to the first indoor unit 20a and the second indoor unit 20b.

[0018] In the following description, the first liquid shut-off valve 25a and the first gas shut-off valve 26a may be collectively referred to as the first shut-off valve, and the second liquid shut-off valve 25b and the second gas shut-off valve 26b may be collectively referred to as the second shut-off valve.

[0019] The outdoor unit 10 includes a compressor 11, a condenser 12, an outdoor fan 13, a high-pressure pressure sensor 16, a low-pressure pressure sensor 18, a compressor discharge temperature sensor 51, and a condenser outlet temperature sensor 53. The compressor 11 compresses the refrigerant. The condenser 12 exchanges heat between the refrigerant flowing out from the compressor 11 and air. The outdoor fan 13 sends air to the condenser 12. The high-pressure pressure sensor 16 detects the pressure of the refrigerant discharged from the compressor 11. The low-pressure pressure sensor 18 detects the pressure of the refrigerant flowing into the compressor 11. The compressor discharge temperature sensor 51 detects the temperature of the pipe through which the refrigerant discharged from the compressor 11 flows. The condenser outlet temperature sensor 53 detects the temperature of the pipe through which the refrigerant flowing out from the condenser 12 flows.

[0020] The first indoor unit 20a includes an expansion valve 21a, an evaporator 22a, an indoor fan 23a, an evaporator gas-side temperature sensor 61a, an evaporator liquid-side temperature sensor 62a, and a refrigerant leak detection sensor 65a. The expansion valve 21a expands the refrigerant. The evaporator 22a exchanges heat between the refrigerant flowing out of the expansion valve 21a and air. The indoor fan 23a sends air to the evaporator 22a. The evaporator gas-side temperature sensor 61a detects the temperature of the piping through which the refrigerant flowing out of the evaporator 22a flows. The evaporator liquid-side temperature sensor 62a detects the temperature of the piping through which the refrigerant flowing into the evaporator 22a flows. The refrigerant leak detection sensor 65a detects refrigerant leakage. The refrigerant leak detection sensor 65a is configured, for example, by an infrared sensor. The compressor 11, condenser 12, expansion valve 21a, and evaporator 22a constitute the first refrigerant circuit.

[0021] The second indoor unit 20b includes an expansion valve 21b, an evaporator 22b, an indoor fan 23b, an evaporator gas-side temperature sensor 61b, an evaporator liquid-side temperature sensor 62b, and a refrigerant leak detection sensor 65b. The expansion valve 21b expands the refrigerant. The evaporator 22b exchanges heat between the refrigerant flowing out of the expansion valve 21b and air. The indoor fan 23b sends air to the evaporator 22b. The evaporator gas-side temperature sensor 61b detects the temperature of the refrigerant flowing out of the evaporator 22b. The evaporator liquid-side temperature sensor 62b detects the temperature of the refrigerant flowing into the evaporator 22b. The refrigerant leak detection sensor 65b detects refrigerant leakage. The refrigerant leak detection sensor 65b is configured, for example, by an infrared sensor. The compressor 11, condenser 12, expansion valve 21b, and evaporator 22b constitute the second refrigerant circuit.

[0022] Figure 3 is a flowchart showing the inspection procedure for the first shut-off valves 25a and 26a of Embodiment 1.

[0023] In step S11, the shut-off valve inspection device 6 sets the inspection mode of the first shut-off valves 25a and 26a connected to the first indoor unit 20a to ON.

[0024] In step S12, the shut-off valve inspection device 6 acquires the detected temperature ETA(1) of the evaporator gas side temperature sensor 61a of the first indoor unit 20a, which is sent via the measurement control unit 5. Here, 1 represents time t1.

[0025] In step S12, the shut-off valve inspection device 6 instructs the measurement control unit 5 to close the first shut-off valves 25a and 26a connected to the first indoor unit 20a.

[0026] In step S13, the shut-off valve inspection device 6 instructs the measurement control unit 5 to start the compressor 11.

[0027] In step S14, if the set predetermined time for the refrigeration cycle of the refrigeration and air conditioning unit 1 to stabilize has elapsed, the process proceeds to step S15.

[0028] In step S15, the shut-off valve inspection device 6 obtains the detected temperature ETA(n) of the evaporator gas side temperature sensor 61a of the first indoor unit 20a, which is sent via the measurement control unit 5. Here, n represents time tn.

[0029] In step S16, if the absolute value of the difference between ETA(1) and ETA(n) is less than or equal to the threshold TH1, the process proceeds to step S18. If the absolute value of the difference between ETA(1) and ETA(n) exceeds the threshold TH1, the process proceeds to step S19.

[0030] In step S18, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are functioning normally.

[0031] In step S19, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are abnormal.

[0032] As described above, according to this embodiment, it is possible to check whether the shut-off valve is operating normally using a temperature sensor installed in the indoor unit, without the need for a flow sensor, thus reducing the cost of the refrigeration and air conditioning system. This is because the temperature sensor is used for controlling the refrigeration and air conditioning system, so there is no need to install an additional temperature sensor. Furthermore, even if an additional temperature sensor were to be added, it would be less expensive than a flow sensor.

[0033] Furthermore, temperature sensors are less expensive than flow sensors and do not need to be connected to piping, thus reducing installation and maintenance costs.

[0034] In the above embodiment, the temperature detected by the evaporator gas-side temperature sensor 61a was used, but the method is not limited to this, and the temperature of the piping of the first indoor unit 20a can be used. For example, the temperature detected by the evaporator liquid-side temperature sensor 62a may be used. In the above embodiment, the order of steps S12 and S13 may be reversed. Also, in the above embodiment, the temperature ETA(1) was measured in step S12, but if the temperature of the refrigerant before starting the compressor can be known in advance, a predetermined temperature can be used instead of measuring the temperature ETA(1).

[0035] Embodiment 2. In this embodiment, the shut-off valve inspection device 6 compares the temperature of the piping of the indoor unit that has been instructed to close the shut-off valve with the temperature of the piping of the indoor unit that has been left open.

[0036] Figure 4 is a flowchart showing the inspection procedure for the first shut-off valves 25a and 26a in Embodiment 2.

[0037] In step S21, the shut-off valve inspection device 6 sets the inspection mode of the first shut-off valves 25a and 26a connected to the first indoor unit 20a to ON.

[0038] In step S22, the shut-off valve inspection device 6 instructs the measurement control unit 5 to start the compressor 11.

[0039] In step S23, the shut-off valve inspection device 6 instructs the measurement control unit 5 to close the first shut-off valves 25a and 26a connected to the first indoor unit 20a. The second shut-off valves 25b and 26b remain open.

[0040] In step S24, if the set predetermined time for the refrigeration cycle to stabilize has elapsed, the process proceeds to step S25.

[0041] In step S25, the shut-off valve inspection device 6 acquires the detected temperature ETA(n) of the evaporator gas side temperature sensor 61a of the first indoor unit 20a and the detected temperature ETB(n) of the evaporator gas side temperature sensor 61b of the second indoor unit 20b, which are sent via the measurement control unit 5.

[0042] In step S26, if the absolute value of the difference between ETA(n) and ETB(n) is less than or equal to the threshold TH2, the process proceeds to step S27. If the absolute value of the difference between ETA(n) and ETB(n) exceeds the threshold TH2, the process proceeds to step S28.

[0043] In step S27, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are abnormal.

[0044] In step S28, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are functioning normally.

[0045] As described above, according to this embodiment, similar to Embodiment 1, it is possible to check whether the shut-off valve is operating normally using a temperature sensor installed in the indoor unit without providing a flow sensor, thus reducing the cost of the refrigeration and air conditioning system.

[0046] Furthermore, according to this embodiment, the first shut-off valves 25a and 26a can be diagnosed while the second indoor unit 20b is in operation. In the above embodiment, the detected temperatures of the evaporator gas-side temperature sensors 61a and 61b were used, but the embodiment is not limited to this, and the temperatures of the piping of the first indoor unit 20a and the piping of the second indoor unit 20b can be used. The detected temperatures of the evaporator liquid-side temperature sensors 62a and 62b may also be used. In the above embodiment, the order of steps S22 and S23 may be reversed.

[0047] Embodiment 3. In this embodiment, the shut-off valve inspection device 6 diagnoses the shut-off valve based on the measurement value from the indoor unit's outlet temperature sensor.

[0048] Figure 5 shows the configuration of the refrigeration and air conditioning system 1 of Embodiment 3. The difference between this refrigeration and air conditioning system 1 and the refrigeration and air conditioning system 1 of Embodiment 1 is that the first indoor unit 20a includes a discharge temperature sensor 63a, and the second indoor unit 20b includes a discharge temperature sensor 63b.

[0049] The air outlet temperature sensor 63a detects the temperature of the air outlet of the first indoor unit 20a. The air outlet temperature sensor 63b detects the temperature of the air outlet of the second indoor unit 20b.

[0050] Figure 6 is a flowchart showing the inspection procedure for the first shut-off valves 25a and 26a of Embodiment 3.

[0051] In step S31, the shut-off valve inspection device 6 sets the inspection mode of the first shut-off valves 25a and 26a connected to the first indoor unit 20a to ON.

[0052] In step S32, the shut-off valve inspection device 6 instructs the measurement control unit 5 to start the compressor 11.

[0053] In step S33, the shut-off valve inspection device 6 instructs the measurement control unit 5 to close the first shut-off valves 25a and 26a connected to the first indoor unit 20a.

[0054] In step S34, if the set time has elapsed, the process proceeds to step S25.

[0055] In step S35, the shut-off valve inspection device 6 acquires the temperature BTA(n) detected by the outlet temperature sensor 63a of the first indoor unit 20a and the temperature BTB(n) detected by the outlet temperature sensor 63b of the second indoor unit 20b, which are sent via the measurement control unit 5.

[0056] In step S36, if the absolute value of the difference between BTA(n) and BTB(n) is less than or equal to the threshold TH3, the process proceeds to step S37. If the absolute value of the difference between BTA(n) and BTB(n) exceeds the threshold TH3, the process proceeds to step S38.

[0057] In step S37, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are abnormal.

[0058] In step S38, the shut-off valve inspection device 6 determines that the first shut-off valves 25a and 26a connected to the first indoor unit 20a are functioning normally.

[0059] As described above, according to this embodiment, similar to Embodiment 1, it is possible to check whether the shut-off valve is operating normally using a temperature sensor installed in the indoor unit without providing a flow sensor, thus reducing the cost of the refrigeration and air conditioning system.

[0060] Furthermore, according to this embodiment, since it is not necessary to consider the influence of the heat capacity of the piping and refrigerant, the waiting time after closing the shut-off valve can be shortened. In addition, the determination may be made using multiple sensor values, including the piping temperature in Embodiment 2. This improves the reliability of the determination. In the above embodiment, the detected temperatures of the outlet temperature sensors 63a and 63b were used, but the embodiment is not limited to this, and the temperature of the room in which the first indoor unit 20a is installed and the temperature of the room in which the second indoor unit 20b is installed can be used. In the above embodiment, the order of steps S32 and S33 may be reversed. In addition, in Embodiment 1, instead of using the evaporator gas side temperatures ETA(1) and ETA(n) of the first indoor unit, the detected temperatures BTA(1) and BTA(n) of the outlet temperature sensor 63a of the first indoor unit 20a may be used.

[0061] The shut-off valve inspection device 6 described in embodiments 1 to 3 above can be configured using digital circuit hardware or software for the corresponding operations. When the shut-off valve inspection device 6 is implemented using software, for example, as shown in Figure 7, the shut-off valve inspection device 6 includes a processor 202 connected by a bus 206, a memory 201, a display device 203, an input device 204, and a communication device 205, and the processor 202 can execute a program stored in the memory 201.

[0062] The embodiments described above are specific examples of the following appendix. (Note 1) A refrigeration and air conditioning system including one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, A refrigeration and air conditioning management system comprising: a shut-off valve inspection device that performs control to close a first shut-off valve to be inspected, and after the closing control of the first shut-off valve, determines whether the first shut-off valve is normal or not based on a first detection value of a temperature sensor of a first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating.

[0063] (Note 2) The refrigeration and air conditioning management system according to Appendix 1, wherein the shut-off valve inspection device determines whether the first shut-off valve is functioning correctly based on the first detected value and the second detected value of the temperature sensor of the first indoor unit while the compressor is not operating before executing control to close the first shut-off valve.

[0064] (Note 3) The refrigeration and air conditioning management system according to Appendix 2, wherein the shut-off valve inspection device determines that the first shut-off valve is abnormal when the absolute value of the difference between the first detected value and the second detected value exceeds a threshold.

[0065] (Note 4) The refrigeration and air conditioning system includes the first indoor unit and the first shut-off valve, a second indoor unit, and a second shut-off valve for connecting the second indoor unit and the outdoor unit. The refrigeration and air conditioning management system according to Appendix 1, wherein the shut-off valve inspection device determines whether the first shut-off valve is functioning correctly based on the first detected value and the second detected value of the temperature sensor of the second indoor unit connected to the second shut-off valve, which is not being controlled to close while the compressor is operating.

[0066] (Note 5) The refrigeration and air conditioning management system described in Appendix 4, wherein the shut-off valve inspection device determines that the first shut-off valve is abnormal when the absolute value of the difference between the first detected value and the second detected value is less than or equal to a threshold value.

[0067] (Note 6) The refrigeration and air conditioning management system according to any one of the appendices 1 to 5, wherein the temperature sensor is a sensor for measuring the piping temperature of the first indoor unit or the second indoor unit.

[0068] (Note 7) The refrigeration and air conditioning management system according to any one of the appendices 1 to 6, wherein the temperature sensor is a sensor that measures the temperature of the room in which the first indoor unit or the second indoor unit is installed.

[0069] (Note 8) The refrigeration and air conditioning management system according to any one of the appendices 1 to 7, wherein the temperature sensor is the outlet temperature sensor of the first indoor unit or the second indoor unit.

[0070] (Note 9) A method for inspecting a shut-off valve in a refrigeration and air conditioning system, which includes one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, The steps include: executing a control to close the first shut-off valve to be inspected, The steps include: after the closing control of the first shut-off valve, obtaining a first detected value from the temperature sensor of the first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating; A method for inspecting a shut-off valve, comprising the step of determining whether the first shut-off valve is functioning normally based on the first detected value.

[0071] (modified version) The following forms of torture are also conceivable.

[0072] Embodiments 1, 2, and 3 described a refrigeration and air conditioning system that includes a shut-off valve located between the indoor unit and the outdoor unit, but the system is not limited to this, and the shut-off valve may be installed inside the indoor unit or the outdoor unit.

[0073] Embodiments 1, 2, and 3 described a refrigeration and air conditioning system in which the indoor unit is an evaporator and the outdoor unit is a condenser, but the system is not limited to this, and the indoor unit may be a condenser and the outdoor unit an evaporator.

[0074] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0075] 1 Refrigeration and air conditioning unit, 5 Measurement and control unit, 6 Shut-off valve inspection device, 7 System controller, 8 Remote monitoring device, 9 Equipment information management system, 10 Outdoor unit, 11 Compressor, 12 Condenser, 13 Outdoor fan, 16 High-pressure sensor, 18 Low-pressure sensor, 20a First indoor unit, 20b Second indoor unit, 21a, 21b Expansion valve, 22a, 22b Evaporator, 23a, 23b Indoor fan, 25a First liquid shut-off valve, 25b Second liquid shut-off valve, 26a First gas shut-off valve, 26b Second gas shut-off valve, 41 Liquid piping, 42 Gas piping, 51 Compressor discharge temperature sensor, 53 Condenser outlet temperature sensor, 61a, 61b Evaporator gas-side temperature sensor, 62a, 62b Evaporator liquid-side temperature sensor, 63a, 63b Discharge temperature sensor, 65a, 65b Refrigerant leak detection sensor, 100 Refrigeration and air conditioning management system, 201 Memory, 202 Processor, 203 Display device, 204 Input device, 205 Communication device, Input unit, 602 Measurement unit, 603 Judgment unit, 604 Judgment value recording unit, 605 Output unit, 606 Display setting unit, 607 Equipment information recording unit, 608 Notification unit.

Claims

1. A refrigeration and air conditioning system including one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, A refrigeration and air conditioning management system comprising: a shut-off valve inspection device that performs control to close a first shut-off valve to be inspected, and after the closing control of the first shut-off valve, determines whether the first shut-off valve is normal or not based on a first detection value of a temperature sensor of a first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating.

2. The refrigeration and air conditioning management system according to claim 1, wherein the shut-off valve inspection device determines whether the first shut-off valve is functioning correctly based on the first detected value and the second detected value of the temperature sensor of the first indoor unit while the compressor is not operating before executing control to close the first shut-off valve.

3. The refrigeration and air conditioning management system according to claim 2, wherein the shut-off valve inspection device determines that the first shut-off valve is abnormal when the absolute value of the difference between the first detected value and the second detected value exceeds a threshold.

4. The refrigeration and air conditioning system includes the first indoor unit and the first shut-off valve, a second indoor unit, and a second shut-off valve for connecting the second indoor unit and the outdoor unit. The refrigeration and air conditioning management system according to claim 1, wherein the shut-off valve inspection device determines whether the first shut-off valve is functioning normally based on the first detected value and the second detected value of the temperature sensor of the second indoor unit connected to the second shut-off valve, which is not being controlled to close while the compressor is operating.

5. The refrigeration and air conditioning management system according to claim 4, wherein the shut-off valve inspection device determines that the first shut-off valve is abnormal when the absolute value of the difference between the first detected value and the second detected value is less than or equal to a threshold value.

6. The refrigeration and air conditioning management system according to any one of claims 1 to 5, wherein the temperature sensor is a sensor for measuring the piping temperature of the first indoor unit or the second indoor unit.

7. The refrigeration and air conditioning management system according to any one of claims 1 to 5, wherein the temperature sensor is a sensor that measures the temperature of the room in which the first indoor unit or the second indoor unit is installed.

8. The refrigeration and air conditioning management system according to claim 7, wherein the temperature sensor is an outlet temperature sensor of the first indoor unit or the second indoor unit.

9. A method for inspecting a shut-off valve in a refrigeration and air conditioning system, which includes one or more indoor units having temperature sensors, an outdoor unit, and a shut-off valve disposed between the indoor and outdoor units, The steps include: executing a control to close the first shut-off valve to be inspected, The steps include: after the closing control of the first shut-off valve, obtaining a first detected value from the temperature sensor of the first indoor unit connected to the first shut-off valve while the compressor of the outdoor unit is operating; A method for inspecting a shut-off valve, comprising the step of determining whether the first shut-off valve is functioning normally based on the first detected value.

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