JP2006266642A - Refrigerant leakage detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant leakage detection system capable of detecting a refrigerant leakage in consideration of characteristics of individual air conditioners. <P>SOLUTION: The refrigerant leakage detection system 3 comprises acquisition devices 100, 200, a storage device 300 and a detector 400. The acquisition devices 100, 200 acquire the operating state data of the air conditioners 10, 20. The storage device 300 stores the operating state data acquired by the acquisition devices 100, 200, as data for detecting the refrigerant leakage. The detector 400 detects the refrigerant leakage in the air conditioners 10, 20, referring to the data for detecting the refrigerant leakage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerant leakage detection system for an air conditioner.

An air conditioner usually includes a refrigerant circuit including devices such as a compressor, an indoor heat exchanger, and an outdoor heat exchanger, and a refrigerant communication pipe that communicates these devices. During the operation of the air conditioner, the refrigerant circulates in the refrigerant circuit and heat is exchanged between the room and the outside, whereby the air in the room where the indoor heat exchanger is installed is cooled or heated.
In such a refrigerant circuit of an air conditioner, the refrigerant flowing through the refrigerant circuit tends to leak little by little as the cumulative number of operations of the air conditioner increases or due to secular change. May decrease. Therefore, conventionally, an air conditioner to which a function of detecting refrigerant leakage is added as in Patent Document 1 has been used.
JP 2000-304388 A

  However, the detection of refrigerant leakage in the conventional air conditioner does not reflect the characteristics of the air conditioner to be detected or the property in which the air conditioner is installed, and the detection result may be inaccurate. . Also in the air conditioner of Patent Document 1, detection of refrigerant leakage is performed using a general simulation model, and characteristics of individual air conditioners are not considered.

  The subject of this invention is providing the refrigerant | coolant leak detection system which can detect a refrigerant | coolant leak in consideration of the characteristic of each air conditioning apparatus.

The refrigerant leak detection system according to the first invention includes an acquisition device, a storage device, and a detection device. The acquisition device acquires operating state data of the air conditioner. The storage device stores the operation state data acquired by the acquisition device as refrigerant leakage detection data. The detection device detects refrigerant leakage in the air conditioner with reference to the refrigerant leakage detection data.
In this refrigerant leakage detection system, the storage device accumulates past operation state data of the air conditioner, and the detection device detects refrigerant leakage in the air conditioner with reference to the past operation state data. Therefore, in this refrigerant | coolant leak detection system, the refrigerant | coolant leak in the air conditioning apparatus made into a detection target can be detected based on the past operation state data of the air conditioning apparatus made into a detection target. Thereby, a refrigerant | coolant leak can be detected in consideration of the characteristic of each air conditioning apparatus.

A refrigerant leakage detection system according to a second aspect of the present invention is the refrigerant leakage detection system according to the first aspect of the present invention, in which the detection device uses the current operating state data acquired by the acquisition device as at least a part of the refrigerant leakage detection data. And refrigerant leakage in the air conditioner is detected.
In this refrigerant leak detection system, the detection device detects the refrigerant leak in the air conditioner by comparing the current operation state data with at least a part of the past operation state data. Therefore, it is possible to use only an appropriate or appropriate amount of operation state data as a comparison target among all past operation state data stored in the storage device. Thereby, the accuracy of refrigerant leakage detection can be improved.

A refrigerant leakage detection system according to a third aspect of the present invention is the refrigerant leakage detection system according to the second aspect of the present invention, in which the detection device uses the current operating state data acquired by the acquisition device as air in the refrigerant leakage detection data. It is compared with the initial operating state data of the air conditioner in a predetermined period from the start of use of the conditioner.
In this refrigerant leak detection system, the detection device compares the current operation state data with the initial operation state data of the air conditioner to detect refrigerant leak in the air conditioner. Since it is estimated that the amount of refrigerant leakage is zero or a small amount during initial operation, the refrigerant leakage detection system detects refrigerant leakage in the air conditioner based on normal operating state data. Thereby, the accuracy of refrigerant leakage detection can be improved.

A refrigerant leak detection system according to a fourth aspect of the present invention is the refrigerant leak detection system according to any of the first to third aspects of the invention, wherein the acquisition device manages the air conditioner in the property where the air conditioner is installed. To do. The storage device and the detection device are remote from the property, and are connected to the acquisition device via an Internet line, a dedicated line, or a telephone line.
Recently, local controllers are often installed in properties where air conditioners are installed. Such a local controller manages the operation of the air conditioner and periodically acquires the operation state data of the air conditioner for remote management and transmits it to the remote management computer of the remote management center. When such a local controller or the like is already installed, it is not necessary to newly install an acquisition device or the like when introducing the refrigerant leakage detection system. Furthermore, even when such a local controller or the like is not installed, the installation method itself of the acquisition device or the like has already been systematized and can be installed relatively easily. As described above, in this refrigerant leak detection system, when the refrigerant leak detection system is introduced, newly installed equipment is minimized, and the burden on the user or service provider related to the introduction of the refrigerant leak detection system is reduced. can do. Moreover, in this refrigerant leak detection system, since the detection device exists remotely from the property, it is not necessary for the service person to visit the site to operate the detection device, further reducing the burden on the cost of the service provider. be able to.

  A refrigerant leakage detection system according to a fifth aspect of the present invention is the refrigerant leakage detection system according to the second aspect of the present invention, and the detection device includes a calculation unit and a determination unit. The calculation unit calculates the Mahalanobis distance of the current operation state data acquired by the acquisition device based on at least a part of the refrigerant leakage detection data. The determination unit determines that the refrigerant is leaking when the Mahalanobis distance is greater than or equal to a predetermined value, and determines that the refrigerant is not leaking when the Mahalanobis distance is smaller than the predetermined value.

In this refrigerant leak detection system, the calculation unit of the detection device calculates the Mahalanobis distance of the current operation state data based on at least a part of the past operation state data, and the determination unit of the detection device is calculated by the calculation unit The Mahalanobis distance is compared with a predetermined value. Thereby, the refrigerant leak detection system can determine whether or not the refrigerant is leaking.
A refrigerant leakage detection system according to a sixth aspect of the present invention is the refrigerant leakage detection system according to any one of the first to fifth aspects of the present invention, wherein the operating state data includes the degree of supercooling, the degree of superheat, the low pressure of the refrigeration cycle of the air conditioner It relates to at least one of pressure, high pressure, outside air temperature, room temperature, and compressor speed.

In this refrigerant leak detection system, the current or past operating state data of the air conditioner includes the supercooling degree, superheat degree, low pressure pressure, high pressure pressure, outside air temperature, indoor temperature, and compressor speed of the refrigeration cycle of the air conditioner. At least one of Thereby, the accuracy of refrigerant leakage detection can be improved.
A refrigerant leakage detection system according to a seventh aspect includes a first acquisition device, a second acquisition device, a storage device, and a detection device. The first acquisition device acquires operation state data of the first air conditioner. The second acquisition device acquires operation state data of a second air conditioner similar to the first air conditioner. The accumulation device accumulates the operation state data of the first air conditioner acquired by the first acquisition device and the operation state data of the second air conditioner acquired by the second acquisition device. The detection device refers to the operation state data of the second air conditioner stored in the storage device when the amount of the operation state data of the first air conditioner stored in the storage device is insufficient. The refrigerant leakage in the first air conditioner is detected.

  In this refrigerant leak detection system, the storage device stores the operation state data of the first air conditioner and the second air conditioner, and when the amount of past operation state data of the first air conditioner is insufficient. The detection device detects refrigerant leakage in the first air conditioner with reference to past operation state data of the second air conditioner. Therefore, in this refrigerant leakage detection system, even when the amount of past operation state data of the first air conditioner is insufficient, the first air conditioner is based on the past operation state data of the similar second air conditioner. The refrigerant leakage can be detected in consideration of the characteristics of the apparatus. Thereby, a refrigerant | coolant leak can be detected in consideration of the characteristic of each air conditioning apparatus. Therefore, in this refrigerant leak detection system, it is possible to improve the accuracy of refrigerant leak detection even when the amount of past operation state data of the first air conditioner is insufficient.

The refrigerant leakage detection system according to an eighth aspect of the present invention is the refrigerant leakage detection system according to the seventh aspect of the present invention, wherein the detection device is insufficient in the amount of operating state data of the first air conditioner accumulated in the accumulation device. When not, the refrigerant leakage in the first air conditioner is detected with reference to the operation state data of the first air conditioner accumulated in the accumulator.
In this refrigerant leak detection system, when the amount of past operation state data of the first air conditioner is not insufficient, the refrigerant leak in the first air conditioner is referred to by referring to the past operation state data of the first air conditioner. Is detected. Thereby, the accuracy of refrigerant leakage detection can be improved.

  In the refrigerant leakage detection system according to the first aspect, the storage device accumulates past operation state data of the air conditioner, and the detection device detects refrigerant leakage in the air conditioner with reference to the past operation state data. . Therefore, in this refrigerant | coolant leak detection system, the refrigerant | coolant leak in the air conditioning apparatus made into a detection target can be detected based on the past operation state data of the air conditioning apparatus made into a detection target. Thereby, a refrigerant | coolant leak can be detected in consideration of the characteristic of each air conditioning apparatus.

  In the refrigerant leakage detection system according to the second aspect of the invention, the detection device detects refrigerant leakage in the air conditioner by comparing the current operation state data with at least a part of the past operation state data. Therefore, it is possible to use only an appropriate or appropriate amount of operation state data as a comparison target among all past operation state data stored in the storage device. Thereby, the accuracy of refrigerant leakage detection can be improved.

  In the refrigerant leakage detection system according to the third aspect of the invention, the detection device detects the refrigerant leakage in the air conditioner by comparing the current operation state data with the initial operation state data of the air conditioner. Since it is estimated that the amount of refrigerant leakage is zero or a small amount during initial operation, the refrigerant leakage detection system detects refrigerant leakage in the air conditioner based on normal operating state data. Thereby, the accuracy of refrigerant leakage detection can be improved.

  In the refrigerant leakage detection system according to the fourth aspect of the invention, the acquisition device is installed in the same property as the air management device, while the storage device and the detection device are installed remotely from the property where the air management device is installed. Recently, local controllers are often installed in properties where air conditioners are installed. Such a local controller manages the operation of the air conditioner and periodically acquires the operation state data of the air conditioner for remote management and transmits it to the remote management computer of the remote management center. For this reason, when introducing the refrigerant leakage detection system, it is possible to minimize newly installed equipment and reduce the burden on the user or service provider related to the introduction of the refrigerant leakage detection system. Moreover, in this refrigerant leak detection system, since the detection device exists remotely from the property, it is not necessary for the service person to visit the site to operate the detection device, further reducing the burden on the cost of the service provider. be able to.

In the refrigerant leakage detection system according to the fifth aspect, the calculation unit of the detection device calculates the Mahalanobis distance of the current operation state data with reference to at least a part of the past operation state data, and the determination unit of the detection device is the calculation unit. The Mahalanobis distance calculated by the above is compared with a predetermined value. Thereby, the refrigerant leak detection system can determine whether or not the refrigerant is leaking.
In the refrigerant leakage detection system according to the sixth aspect of the present invention, the current or past operation state data of the air conditioner includes the subcooling degree, superheat degree, low pressure pressure, high pressure pressure, outside air temperature, room temperature, and air temperature of the air conditioning apparatus. It relates to at least one of the compressor speeds. Thereby, the accuracy of refrigerant leakage detection can be improved.

  In the refrigerant leak detection system according to the seventh aspect of the present invention, the storage device stores the operation state data of the first air conditioner and the second air conditioner, and the amount of past operation state data of the first air conditioner is insufficient. When it is, the detection device detects refrigerant leakage in the first air conditioner with reference to past operation state data of the second air conditioner. Therefore, in this refrigerant leakage detection system, even when the amount of past operation state data of the first air conditioner is insufficient, the first air conditioner is based on the past operation state data of the similar second air conditioner. The refrigerant leakage can be detected in consideration of the characteristics of the apparatus. Thereby, a refrigerant | coolant leak can be detected in consideration of the characteristic of each air conditioning apparatus. Therefore, in this refrigerant leak detection system, it is possible to improve the accuracy of refrigerant leak detection even when the amount of past operation state data of the first air conditioner is insufficient.

  In the refrigerant leakage detection system according to the eighth aspect of the present invention, when the amount of past operation state data of the first air conditioner is not insufficient, the first air conditioner is referred to by referring to the past operation state data of the first air conditioner. Detect refrigerant leakage in the device. Thereby, the accuracy of refrigerant leakage detection can be improved.

<Configuration of refrigerant leakage detection system>
With reference to FIG. 1, the structure of the refrigerant | coolant leak detection system 3 which concerns on one Embodiment of this invention is demonstrated.
The refrigerant leakage detection system 3 detects refrigerant leakage in a plurality of air conditioners including the first air conditioner 10 and the second air conditioner 20. Note that FIG. 1 does not clearly show an air conditioner other than the first air conditioner 10 and the second air conditioner 20, and is omitted in the following description. It is assumed that there is an air conditioner other than 10 and the second air conditioner 20.

  The refrigerant leakage detection system 3 is connected to the first air conditioner 10 to manage the first air conditioner 10, and is connected to the second air conditioner 20 and the second local controller (hereinafter, LC) 100. The second LC 200 for managing the air conditioner 20, the remote management computer 400 in the remote management center 60 connected to the first LC 100 and the second LC 200 via the Internet line 70, and the remote management computer in the remote management center 60 400 and a large-capacity storage device 300 connected to 400. In FIG. 1, LCs other than the first LC 100 and the second LC 200 are not clearly shown, and are omitted in the following description, but actually, other than the first air conditioner 10 and the second air conditioner 20. It is assumed that there are LCs other than the first LC 100 and the second LC 200 that are connected to the air conditioner in a one-to-one or one-to-many manner and manage the air conditioner in a one-to-one or one-to-many manner.

The first LC 100 is installed in the first property 110 together with the first air conditioner 10. The second LC 200 is installed in the second property 210 together with the second air conditioner 20.
(Configuration of the first local controller)
The configuration of the first LC 100 will be described with reference to FIG.
The first LC 100 includes communication units 101 and 103 and a management unit 102.

The communication unit 101 is connected to the first air conditioner 10 directly or via a dedicated adapter, and transmits and receives data to and from the first air conditioner 10. The communication unit 103 is connected to the remote management computer 400 via the Internet line 70 and exchanges data with the remote management computer 400. The management unit 102 gives an instruction to the communication unit 101 so as to periodically obtain the operation state data of the first air conditioner 10, or the first air conditioner 10 from the remote management computer 400 received by the communication unit 103. The operation of the first air conditioner 10 is managed by executing a command for The command from the remote management computer 400 to the first air conditioner 10 includes a command for starting or stopping the operation of the first air conditioner 10 or changing the operation mode from a remote location as necessary.
(Configuration of second local controller)
The configuration of the second LC 200 is the same as the configuration of the first LC 100.
(Configuration of remote management computer)
The configuration of the remote management computer 400 will be described with reference to FIG.

The remote management computer 400 exists in the remote management center 60 that is remote from the first property 110 and the second property 210. The remote management computer 400 transmits instructions for managing the respective operations to the first LC 100 and the second LC 200 as necessary, and manages the first air conditioner 10 and the second air conditioner 20 from a remote location.
The remote management computer 400 detects refrigerant leakage in the first air conditioner 10 and the second air conditioner 20. The remote management computer 400 includes communication units 401 and 408, a calculation unit 402, a determination unit 403, a display unit 404, a CPU 405, a memory 406, and a hard disk (hereinafter referred to as HD) 407.

The communication unit 408 receives the operation state data of the first air conditioner 10 from the first LC 100 and the operation state data of the second air conditioner 20 from the second LC 200. The communication unit 401 sequentially sends the operation state data received by the communication unit 408 to the mass storage device 300 connected to the remote management computer 400 in the remote management center 60. The calculation unit 402 uses the first air conditioner 10 and the second air conditioner 10 and the second air conditioner 10 and the second air conditioner 20 based on at least a part of the past operation state data stored in the large capacity accumulator 300 as a reference. The Mahalanobis distance of the current operating state data of the air conditioner 20 is calculated. The determination unit 403 determines whether the refrigerant is leaking in the first air conditioner 10 and the second air conditioner 20 from the Mahalanobis distance calculated by the calculation unit 402. The display unit 404 is a liquid crystal display, and displays that when the determination unit 403 detects that the refrigerant is leaking in the first air conditioner 10 and the second air conditioner 20. Details of processing by the communication units 401 and 408, the calculation unit 402, the determination unit 403, the display unit 404, the CPU 405, the memory 406, and the HD 407 will be described later.
(Configuration of mass storage device)
The large-capacity storage device 300 exists in the remote management center 60 and communicates with the remote management computer 400. The large-capacity storage device 300 includes an operation information database 301 (see FIG. 1) that stores operation state data of the first air conditioner 10 and the second air conditioner 20. When the mass storage device 300 receives one operation state data of the first air conditioner 10 or the second air conditioner 20 from the communication unit 401, the mass storage device 300 sequentially adds one new data to the operation information database 301 and operates. Store state data. The communication unit 401 can refer to the driving information database 301 at any time.

The operation information database 301 includes data ID, date / time, air conditioner ID, operation mode, degree of supercooling, degree of superheat, high pressure, low pressure, outside temperature, room temperature, and compressor speed. In the data ID field, a value representing the ID of each data is stored. The date / time field stores a value representing the date / time when each operation state data was acquired. The air conditioner ID field stores a value representing the ID of the air conditioner corresponding to each operation state data. In the operation mode field, a value representing the operation mode of the air conditioner corresponding to each operation state data is stored. The supercooling degree, superheating degree, high pressure pressure, low pressure pressure, outside air temperature, room temperature, and compressor rotation speed field are respectively the supercooling degree SC, superheat degree SH, high pressure Hp, Stored are values representing the low pressure Lp, the outside air temperature Ta, the room temperature Tr, and the compressor speed f.
(Configuration of the first air conditioner)
With reference to FIG. 4, the structure of the 1st air conditioning apparatus 10 is demonstrated.

The first air conditioner 10 cools or heats the air in the room where the indoor units 4 and 5 of the first air conditioner 10 are installed by performing a vapor compression refrigeration cycle operation. The refrigerant circuit 1 of the first air conditioner 10 includes an outdoor unit 2, a plurality of (in this embodiment, two) indoor units 4 and 5 connected in parallel to the outdoor unit 2, the outdoor unit 2 and the indoor unit A liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7 that connect the units 4 and 5 are provided.
[Indoor unit]
The indoor units 4 and 5 are installed by embedding or hanging on the indoor ceiling of the first property 110 or by hanging on the indoor wall surface. The indoor units 4 and 5 are connected to the outdoor unit 2 via a liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7. In addition, since the indoor unit 4 and the indoor unit 5 have the same configuration, only the configuration of the indoor unit 4 will be described here, and the configuration of the indoor unit 5 is the 40th number indicating each part of the indoor unit 4. The reference numerals in the 50s are attached instead of the reference numerals, and description of each part is omitted.

The indoor unit 4 includes an indoor refrigerant circuit 1a (in the indoor unit 5, an indoor refrigerant circuit 1b) and an indoor fan 43. The indoor refrigerant circuit 1 a includes an indoor expansion valve 41 and an indoor heat exchanger 42.
The indoor expansion valve 41 is an electric expansion valve connected to the liquid side of the indoor heat exchanger 42 in order to adjust the flow rate of the refrigerant flowing in the indoor refrigerant circuit 1a.

The indoor heat exchanger 42 functions as a refrigerant evaporator during cooling operation to cool indoor air, and functions as a refrigerant condenser during heating operation to heat indoor air.
The indoor fan 43 can exchange heat between the indoor air and the refrigerant flowing through the indoor heat exchanger 42 by sucking the indoor air into the indoor unit 4 and supplying the air after heat exchange into the room. It is. The indoor fan 43 can change the flow rate of the air supplied to the indoor heat exchanger 42.

The indoor unit 4 is provided with sensors 44 to 46. The liquid side of the indoor heat exchanger 42 detects the temperature of the refrigerant in the liquid state or the gas-liquid two-phase state (that is, the refrigerant temperature corresponding to the condensing temperature during heating operation or the evaporating temperature during cooling operation). A temperature sensor 44 is provided. A gas side temperature sensor 45 that detects the temperature of the refrigerant in the gas state or the gas-liquid two-phase state is provided on the gas side of the indoor heat exchanger 42. An indoor temperature sensor 46 that detects the temperature of indoor air flowing into the indoor unit 4 (that is, the indoor temperature Tr) is provided on the indoor air inlet side of the indoor unit 4. The liquid side temperature sensor 44, the gas side temperature sensor 45, and the room temperature sensor 46 are thermistors. In addition, the indoor unit 4 includes an indoor side control unit 47 that controls the operation of each unit constituting the indoor unit 4. And the indoor side control part 47 has the microcomputer, memory, etc. which were provided in order to control the indoor unit 4, and is with the remote control (not shown) for operating the indoor unit 4 separately. Control signals and the like are exchanged between them, and control signals and the like are exchanged with the outdoor unit 2.
[Outdoor unit]
The outdoor unit 2 is installed on the roof of the first property 110, and is connected to the indoor units 4 and 5 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7.

The outdoor unit 2 includes an outdoor refrigerant circuit 1 c and an outdoor fan 27. The outdoor refrigerant circuit 1c includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an accumulator 24, a liquid side closing valve 25, and a gas side closing valve 26.
The compressor 21 is a compressor capable of changing the operating capacity, and is a positive displacement compressor driven at a rotational speed f by a motor 21a controlled by an inverter.

The four-way switching valve 22 is a valve for switching the direction of refrigerant flow. During the cooling operation, the four-way switching valve 22 is in a state indicated by a solid line, and during the heating operation, the four-way switching valve 22 is in a state indicated by a broken line.
The outdoor heat exchanger 23 functions as a refrigerant condenser during the cooling operation, and functions as a refrigerant evaporator during the heating operation. The outdoor heat exchanger 23 has a gas side connected to the four-way switching valve 22 and a liquid side connected to the liquid refrigerant communication pipe 6.

The outdoor fan 27 can exchange heat between the outdoor air and the refrigerant flowing through the outdoor heat exchanger 23 by sucking outdoor air into the outdoor unit 2 and discharging the air after heat exchange outside the outdoor unit 2. It is. The outdoor fan 27 can change the flow rate of air supplied to the outdoor heat exchanger 23.
The accumulator 24 is connected between the four-way switching valve 22 and the compressor 21 and is a container capable of storing surplus refrigerant generated in the refrigerant circuit 1 according to the operating load of the indoor units 4 and 5. is there.

The liquid side shutoff valve 25 and the gas side shutoff valve 26 are valves provided at connection ports with the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7. The liquid side closing valve 25 is connected to the outdoor heat exchanger 23. The gas side closing valve 26 is connected to the four-way switching valve 22.
The outdoor unit 2 is provided with sensors 28 to 35. Specifically, the outdoor unit 2 includes a suction pressure sensor 28 that detects the suction pressure (ie, the low pressure Lp) of the compressor 21 and a discharge that detects the discharge pressure (ie, the high pressure Hp) of the compressor 21. A pressure sensor 29, a suction temperature sensor 32 that detects the suction temperature of the compressor 21, and a discharge temperature sensor 33 that detects the discharge temperature of the compressor 21 are provided. The suction temperature sensor 32 is provided on the inlet side of the accumulator 24. The outdoor heat exchanger 23 includes a heat exchanger temperature sensor 30 that detects the temperature of the refrigerant flowing in the outdoor heat exchanger 23 (that is, the refrigerant temperature corresponding to the condensation temperature during the cooling operation or the evaporation temperature during the heating operation). Is provided. On the liquid side of the outdoor heat exchanger 23, a liquid side temperature sensor 31 that detects the temperature of the refrigerant in the liquid state or the gas-liquid two-phase state is provided. A gas side temperature sensor 35 that detects the temperature of the refrigerant in the gas state or the gas-liquid two-phase state is provided on the gas side of the outdoor heat exchanger 23. An outdoor air temperature sensor 34 that detects the temperature of the outdoor air flowing into the outdoor unit 2 (that is, the outdoor air temperature Ta) is provided on the outdoor air inlet side of the outdoor unit 2. The outdoor unit 2 includes an outdoor control unit 36 that controls the operation of each unit constituting the outdoor unit 2. The outdoor control unit 36 includes a microcomputer provided for controlling the outdoor unit 2, a memory, an inverter circuit for controlling the motor 21a, and the like. Control signals and the like are exchanged between 47 and 57.

The control unit 8 includes indoor side control units 47 and 57 and an outdoor side control unit 36. The control unit 8 receives detection signals from the various sensors 28 to 35, 44 to 46, and 54 to 56, and controls various devices and valves 21, 22, 41, and 51 based on these detection signals and the like. Moreover, the control part 8 is connected to 1st LC100, and 1st LC100 acquires the detection signal of various sensors 28-35, 44-46, 54-56 as driving | running state data.
[Operation of the first air conditioner]
Next, the operation mode of the 1st air conditioning apparatus 10 is demonstrated. The operation mode of the first air conditioner 10 includes a cooling operation mode and a heating operation mode.

  During the cooling operation, the four-way switching valve 22 is in the state shown by the solid line in FIG. 4, that is, the discharge side of the compressor 21 is connected to the gas side of the outdoor heat exchanger 23, and the suction side of the compressor 21 is the indoor heat. It will be in the state connected to the gas side of the exchangers 42 and 52. FIG. Further, the liquid side closing valve 25 and the gas side closing valve 26 are opened, and the opening degrees of the indoor expansion valves 41 and 51 are adjusted so that the superheat degree SH of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. It has come to be. The superheat degree SH of the refrigerant at the outlets of the indoor heat exchangers 42 and 52 is obtained by subtracting the refrigerant temperature value detected by the liquid side temperature sensors 44 and 54 from the refrigerant temperature value detected by the gas side temperature sensors 45 and 55. The suction pressure of the compressor 21 detected or detected by the suction pressure sensor 28 is converted into a saturation temperature value corresponding to the evaporation temperature, and the refrigerant temperature value detected by the gas side temperature sensors 45 and 55 It is detected by subtracting the saturation temperature value of the refrigerant. The refrigerant subcooling degree SC at the outlet of the outdoor heat exchanger 23 is detected by the liquid side temperature sensor 31 by converting the discharge pressure of the compressor 21 detected by the discharge pressure sensor 29 into a saturation temperature value with respect to the condensation temperature. It is detected by subtracting the saturation temperature value of the refrigerant from the refrigerant temperature value.

  When the compressor 21, the outdoor fan 27, and the indoor fans 43 and 53 are started in the state of the refrigerant circuit 1, the low-pressure Lp gas refrigerant is sucked into the compressor 21 and compressed to become a high-pressure Hp gas refrigerant. . Thereafter, the gas refrigerant having the high pressure Hp is sent to the outdoor heat exchanger 23 via the four-way switching valve 22 and is condensed by exchanging heat with the outdoor air supplied by the outdoor fan 27. It becomes a liquid refrigerant.

Then, the liquid refrigerant having the high pressure Hp is sent to the indoor units 4 and 5 via the liquid side closing valve 25 and the liquid refrigerant communication pipe 6.
The liquid refrigerant at the high pressure Hp sent to the indoor units 4 and 5 is reduced in pressure by the indoor expansion valves 41 and 51 to become a gas-liquid two-phase refrigerant at the low pressure Lp and sent to the indoor heat exchangers 42 and 52. Then, heat is exchanged with the indoor air in the indoor heat exchangers 42 and 52 to evaporate to become a gas refrigerant having a low pressure Lp. Here, the indoor expansion valves 41 and 51 control the flow rate of the refrigerant flowing in the indoor heat exchangers 42 and 52 so that the degree of superheat SH at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. The gas refrigerant having the low pressure Lp evaporated in the indoor heat exchangers 42 and 52 has a predetermined superheat degree SH. Thus, the refrigerant | coolant of the flow volume according to the driving | running load requested | required in each indoor heat exchanger 42 and 52 in the air conditioned space in which each indoor unit 4 and 5 was installed is flowing.

  The gas refrigerant having the low pressure Lp is sent to the outdoor unit 2 via the gas refrigerant communication pipe 7 and flows into the accumulator 24 via the gas side closing valve 26 and the four-way switching valve 22. Then, the gas refrigerant having the low pressure Lp flowing into the accumulator 24 is sucked into the compressor 21 again. Here, depending on the operating load of the indoor units 4 and 5, for example, when the operating load of one of the indoor units 4 and 5 is small or stopped, or the operating load of both the indoor units 4 and 5 is When a surplus refrigerant amount is generated in the refrigerant circuit 1 as in the case where the refrigerant is small, the surplus refrigerant is accumulated in the accumulator 24.

  On the other hand, during the heating operation, the four-way switching valve 22 is in the state indicated by the broken line in FIG. 4, that is, the discharge side of the compressor 21 is connected to the gas side of the indoor heat exchanger 52 and the suction side of the compressor 21 is It will be in the state connected to the gas side of the outdoor heat exchanger 23. FIG. Further, the liquid side closing valve 25 and the gas side closing valve 26 are opened, and the indoor expansion valves 41 and 51 are opened so that the refrigerant subcooling degree SC at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. It has come to be adjusted. The refrigerant supercooling degree SC at the outlets of the indoor heat exchangers 42 and 52 converts the discharge pressure of the compressor 21 detected by the discharge pressure sensor 29 into a saturation temperature value with respect to the condensation temperature, and the liquid side temperature sensors 44 and 54. This is detected by subtracting the saturation temperature value of the refrigerant from the refrigerant temperature value detected by the above. Whether the refrigerant superheat degree SH at the outlet of the outdoor heat exchanger 23 is detected by subtracting the refrigerant temperature value detected by the liquid side temperature sensor 31 from the refrigerant temperature value detected by the gas side temperature sensor 35. Alternatively, the suction pressure of the compressor 21 detected by the suction pressure sensor 28 is converted into a saturation temperature value corresponding to the evaporation temperature, and the saturation temperature value of this refrigerant is calculated from the refrigerant temperature value detected by the gas side temperature sensor 35. Detected by subtracting.

When the compressor 21, the outdoor fan 27, and the outdoor fans 43 and 53 are started in the state of the refrigerant circuit 1, the low-pressure Lp gas refrigerant is sucked into the compressor 21 and compressed to become high-pressure Hp gas refrigerant. The four-way switching valve 22, the gas side closing valve 26 and the gas refrigerant communication pipe 7 are sent to the indoor units 4 and 5.
And after the gas refrigerant of the high pressure Hp sent to the indoor units 4 and 5 is condensed by performing heat exchange with the indoor air in the indoor heat exchangers 42 and 52, the liquid refrigerant of the high pressure Hp is obtained. The refrigerant is decompressed by the indoor expansion valves 41 and 51 to become a gas-liquid two-phase refrigerant having a low pressure Lp. Here, the indoor expansion valves 41 and 51 control the flow rate of the refrigerant flowing in the indoor heat exchangers 42 and 52 so that the degree of supercooling SC at the outlets of the indoor heat exchangers 42 and 52 becomes a predetermined value. Therefore, the liquid refrigerant having the high pressure Hp condensed in the indoor heat exchangers 42 and 52 has a predetermined supercooling degree SC. Thus, the refrigerant | coolant of the flow volume according to the driving | running load requested | required in each indoor heat exchanger 42 and 52 in the air conditioned space in which each indoor unit 4 and 5 was installed is flowing.

The refrigerant in the gas-liquid two-phase state at the low pressure Lp is sent to the outdoor unit 2 via the liquid refrigerant communication pipe 6 and flows into the outdoor heat exchanger 23 via the liquid side closing valve 25. Then, the refrigerant in the gas-liquid two-phase state having the low pressure Lp flowing into the outdoor heat exchanger 23 is condensed by performing heat exchange with the outdoor air supplied by the outdoor fan 27, and becomes a gas refrigerant having the low pressure Lp. It flows into the accumulator 24 via the path switching valve 22. Then, the gas refrigerant having the low pressure Lp flowing into the accumulator 24 is sucked into the compressor 21 again. Here, depending on the operating load of the indoor units 4 and 5, for example, when the operating load of one of the indoor units 4 and 5 is small or stopped, or the operating load of both the indoor units 4 and 5 is When a surplus refrigerant amount is generated in the refrigerant circuit 1 as in the case where the refrigerant is small, the surplus refrigerant is accumulated in the accumulator 24 as in the cooling operation.
(Configuration of second air conditioner)
The configuration of the second air conditioner is the same as the configuration of the first air conditioner. Moreover, the apparatus which comprises a 2nd air conditioning apparatus has the same model number as the apparatus which comprises the 1st air conditioning apparatus corresponding to each apparatus. Furthermore, the 1st property 110 in which the 1st air conditioning apparatus 10 was installed, and the 2nd property 210 in which the 2nd air conditioning apparatus 20 was installed exist in the vicinity, and environmental conditions, such as external temperature, are also substantially equal. As described above, the first air conditioner 10 and the second air conditioner 20 are similar in configuration and exist under similar environmental conditions.
(Detection operation of refrigerant leakage in the first air conditioner)
Next, the operation in which the refrigerant leakage detection system 3 detects refrigerant leakage in the first air conditioner 10 will be described.

  First, consider immediately after installing the first air conditioner 10 in the first property 110 and starting to use the first air conditioner 10. As the first air conditioner 10 starts to be used, the first LC 100 also starts to operate, and continuously acquires the operation state data of the first air conditioner 10 from the first air conditioner 10. The first LC 100 displays daily operation data of the first air conditioner 10 for one day, data indicating the date and time when the operation state data was acquired, and the operation mode of the first air conditioner 10 as daily report data. Data to be represented, data representing the ID of the first air conditioner 10 to be detected, and the like are transmitted to the remote management computer 400 in the remote management center 60 via the Internet line 70. The operation state data includes data representing the degree of supercooling SC, the degree of superheat SH, the high pressure Hp, the low pressure Lp, the outside air temperature Ta, the room temperature Tr, and the compressor speed f of the refrigeration cycle of the first air conditioner 10. included.

When the communication unit 401 of the remote management computer 400 sends the operation state data from the first LC 100 to the large-capacity storage device 300, the operation state data is sequentially stored as new data in the operation information database 301 of the large-capacity storage device 300. It will be stored.
The first air conditioner 10 requires periodic inspection for refrigerant leakage when a predetermined time comes after the start of use. The period of the periodic inspection is set in advance. When the period of the periodic inspection comes, the remote management computer 400 performs the refrigerant leak detection operation in the first air conditioning apparatus 10.

Hereinafter, an operation in which the remote management computer 400 detects refrigerant leakage in the first air conditioner 10 will be described with reference to FIG.
In the following description, the use of the second air conditioner 20 has started long before the use of the first air conditioner 10 has started, and the use of the first air conditioner 10 has started. In the operation information database 301, it is assumed that past operation state data corresponding to each operation mode such as the cooling operation mode and the heating operation mode is sufficiently stored.

In step S <b> 21, the communication unit 408 receives daily report data including the operation state data for one day of the first air conditioner from the first LC 100 via the Internet line 70.
Next, in step S22, the CPU 405 selects n driving state data that are in the steady state and have the same driving mode ID among the driving state data included in the daily report data, according to the control program stored in the HD 407, N sets of data consisting of supercooling degree SC, superheat degree SH, high pressure Hp, low pressure Lp, outside air temperature Ta, room temperature Tr, and compressor speed f of one set of refrigeration cycles are prepared and stored in memory 406. To do.

  Next, in step S <b> 23, the CPU 405 retrieves initial operation state data of the first air conditioner 10 with reference to the operation information database 301 in the large capacity storage device 300 according to the control program stored in the HD 407. Further, the CPU 405 checks whether or not there are m data in the initial operation state data that are in the steady state and have the same operation mode ID as the n operation state data selected in step S22. If there are m, the process proceeds to step S24. If there are only m ′ (0 ≦ m ′ <m), the process proceeds to step S25.

  In step S24, the CPU 405 selects m operating state data in step S23 from the initial operating state data of the first air conditioner 10 according to the control program stored in the HD 407, and supercools one set of refrigeration cycles. M data sets consisting of degree SC, superheat degree SH, high pressure Hp, low pressure Lp, outside air temperature Ta, room temperature Tr, compressor speed f, and the n data sets prepared in step S22 The comparison target data is stored in the memory 406, and the process proceeds to step S26.

  In step S25, the CPU 405 selects m ′ (0 ≦ m ′ <m) operation state data in step S23 from the initial operation data of the first air conditioner 10 according to the control program stored in the HD 407, Furthermore, the operation mode ID is equal to the n operation state data that are in the steady state among the initial operation state data of the second air conditioner 20 similar to the first air conditioner 10 and are selected in step S22. A data set consisting of the supercooling degree SC, superheat degree SH, high pressure Hp, low pressure Lp, outside air temperature Ta, indoor temperature Tr, and compressor speed f of one set of refrigeration cycles is selected. m are prepared and stored in the memory 406 as comparison target data of the n data sets prepared in step S22.

In step S26, the calculation unit 402 calculates n Mahalanobis distances for each of the n data sets based on the comparison target data stored in the memory 406 in step S24 or step S25.
The Mahalanobis distance D _k (k = 1,..., N) of each data set is calculated by the following equation.

D _k ² = (X _k −μ) ^T Σ ⁻¹ (X _k −μ) (k = 1,..., N)
Here, X _k is SC ₁ , SC ₂ ,..., SC _n and the superheat degree is SH ₁ , SH ₂ ,. _n, Hp ₁ a high _{pressure, Hp 2, ···, Hp n} , Lp 1 and low _{pressure, Lp 2, ···, Lp n} , the outside air temperature _{Ta 1, Ta 2, ···,} Ta n, the room temperature _{Tr 1, Tr 2, ···,} Tr n, the compressor rotational speed f _1, f _2, ···, when the f _{n,
X k = (SC k, SH} k, Hp k, Lp k, Ta k, Tr k, f k) (k = 1, ···, n)
Is an observation matrix with 7 rows and 1 column,
(X _k −μ) ^T is a transposed matrix of (X _k −μ),
μ is a supercooling degree data group (SC ₁ , SC ₂ ,..., SC _m ) and superheat degree data group (SH ₁ , SH ₂ ) of the refrigeration cycle of the first air conditioner 10 having m elements. ,..., SH _m ), high pressure data group (Hp ₁ , Hp ₂ ,..., Hp _m ), low pressure data group (Lp ₁ , Lp ₂ ,..., Lp _m ), outside air temperature data. Group (Ta ₁ , Ta ₂ ,..., Ta _m ), room temperature data group (Tr ₁ , Tr ₂ ,..., Tr _m ), compressor speed data group (f ₁ , f ₂ ,... .., F _m ), it is a 7 × 1 average matrix whose components are the average values of these seven data groups,
Σ is a supercooling degree data group (SC ₁ , SC ₂ ,..., SC _m ) and superheat degree data group (SH ₁ , SH ₂ ) of the refrigeration cycle of the first air conditioner 10 each having m elements. ,..., SH _m ), high pressure data group (Hp ₁ , Hp ₂ ,..., Hp _m ), low pressure data group (Lp ₁ , Lp ₂ ,..., Lp _m ), outside air temperature data. Group (Ta ₁ , Ta ₂ ,..., Ta _m ), room temperature data group (Tr ₁ , Tr ₂ ,..., Tr _m ), compressor speed data group (f ₁ , f ₂ ,... ., F _m ) is a 7 × 7 variance-covariance matrix.

Next, in step S27, the determination unit 403 compares each of the n Mahalanobis distances D _k (k = 1,..., N) calculated in step S26 with a predetermined value. If there are 1 or more (1 ≦ l ≦ n) greater than a predetermined value among the Mahalanobis distances D _k (k = 1,..., N) calculated in step S26, the determination unit 403 is a refrigerant. It is determined that the refrigerant has leaked, and if the number greater than the predetermined value is less than l, it is determined that the refrigerant has not leaked. If it is determined that the refrigerant is leaking, the process proceeds to step S28. If it is not determined that the refrigerant is leaking, the flow ends.

In step S <b> 28, the display unit 404 displays the determination result and notifies a serviceman of the remote management center 60 that the refrigerant has leaked in the first air conditioning apparatus 10.
(Refrigerant leak detection operation in the second air conditioner)
The refrigerant leak detection operation in the second air conditioner 20 is the same as the refrigerant leak detection operation in the first air conditioner 10.
(Characteristic)
(1)
In the said embodiment, the detection of the refrigerant | coolant leakage in the 1st air conditioning apparatus 10 is the 2nd similar to the 1st air conditioning apparatus 10 or the 1st air conditioning apparatus 10 using the present driving | running state data of the 1st air conditioning apparatus 10. FIG. This is performed by comparing with past operating state data of the air conditioner 20. Thereby, even when the amount of past operating state data of the first air conditioner is insufficient, the refrigerant leakage can be detected in consideration of the characteristics of the individual air conditioners. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10.
(2)
In the above embodiment, the refrigerant leakage detection in the first air conditioning apparatus 10 is mainly performed by the remote management computer 400 in the remote management center 60. That is, the first local controller 100 in the first property 110 that is the same as the first air conditioner 10 only needs to acquire and transmit the operation state data from the first air conditioner 10, and to detect refrigerant leakage. The main processing is performed by the remote management computer 400. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10. As a result, it is relatively easy to perform data mining that requires a high calculation capacity for a huge amount of past driving state data included in the driving information database 301, and the refrigerant leakage is more accurate than before. Detection is possible.
(3)
Recently, equipment such as air conditioners are often managed by remote management centers that are remote via the Internet line, etc., and local controllers are installed in the properties where air conditioners are installed. There are many. Such a local controller manages the operation of the air conditioner and periodically acquires the operation state data of the air conditioner for remote management and transmits it to the remote management computer of the remote management center. In such a case, when introducing the refrigerant leakage detection system 3, it is possible to use existing equipment, minimize newly introduced equipment, and reduce the burden on the cost of the user or service provider. can do.
<Modification>
(1)
In the above embodiment, the refrigerant leakage detection in the first air conditioner 10 is performed by the remote management computer 400 in the remote management center 60, but in the first property 110 where the first air conditioner 10 exists. It may be done at. In this case, for example, a service person travels to the first property 110 with a notebook computer having a program for detecting refrigerant leakage according to the flowchart of FIG. 5, and the first air conditioner in the first property 110. The refrigerant leakage in the first air-conditioning apparatus 10 may be detected by connecting to the first LC 100 that manages 10 and further connecting to the large-capacity storage apparatus 300 that is remote via the Internet line 70. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10.
(2)
The first LC 100 may perform a part of the refrigerant leak detection operation in the first air-conditioning apparatus 10 performed by the remote management computer 400 in the above embodiment. That is, the remote management computer 400 performs a process with a relatively large calculation load, and the first LC 100 performs a process with a relatively small calculation load. For example, the remote management computer 400 only calculates the variance-covariance matrix and the mean value matrix in step S26, and the first LC 100 performs other processes in the flowchart of FIG. The remote management computer 400 calculates the variance covariance matrix and the mean value matrix before the first LC 100 performs processing other than the calculation of the variance covariance matrix and the mean value matrix, and transmits the computation results to the first LC 100. deep. In this case, the refrigerant leakage detection system 3 can detect refrigerant leakage in the first air conditioner 10 even when the remote management computer 400 is disconnected from the first air conditioner 10 due to a network failure or the like. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10.
(3)
In the above embodiment, the refrigerant leakage detection in the first air conditioner 10 is performed by detecting the supercooling degree SC, the superheat degree SH, the low pressure Lp, the high pressure Hp, the outside air temperature Ta, the indoor temperature of the refrigeration cycle of the first air conditioner 10. Although the temperature Tr and the compressor speed f are used, the refrigerant leakage is detected using various state quantities obtained from the detection signals of the various sensors 28 to 35, 44 to 46, and 54 to 56. Also good. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10.
(4)
In the above embodiment, detection of refrigerant leakage in the first air conditioner 10 is performed by Mahalanobis distance calculation according to step S26 in FIG. 5, but other data mining methods such as multiple regression analysis and cluster analysis are used. May be. The same applies to the detection of refrigerant leakage in air conditioners other than the first air conditioner 10.
(5)
The processing by the communication units 401 and 408, the calculation unit 402, the determination unit 403, and the display unit 404 of the remote management computer 400 is performed in accordance with an appropriate control program stored in the HD 407, similarly to the other processing in the remote management computer 400. It may be executed by the CPU 405. That is, the entire processing by the remote management computer 400 does not need to be distributed to the communication units 401 and 408, the calculation unit 402, the determination unit 403, the display unit 404, the CPU 405, the memory 406, and the HD 407 in the form of the above embodiment. It can be implemented by hardware, software or a combination thereof in any manner.

  Further, the first LC 100 may include a microcomputer, and the processing by the communication units 101 and 103 and the management unit 102 of the first LC 100 may be executed by the microcomputer of the first LC 100. That is, the entire processing by the first LC 100 does not need to be distributed to the communication units 101 and 103 and the management unit 102 in the aspect of the above-described embodiment, and can be executed by hardware, software, or a combination thereof in any aspect. The same applies to the processing in the LC other than the first LC 100.

  The present invention has an effect that refrigerant leakage can be detected in consideration of the characteristics of individual air conditioners, and is useful as a refrigerant leak detection system for air conditioners.

The figure which shows the structure of the refrigerant | coolant leak detection system which concerns on one Embodiment of this invention. The figure which shows the structure of a 1st local controller. The figure which shows the structure of the computer for remote management. The refrigerant circuit figure of the air conditioning apparatus which concerns on one Embodiment of this invention. The flowchart of the operation | movement in which the computer for remote management detects the refrigerant | coolant leakage in a 1st air conditioning apparatus.

Explanation of symbols

3 refrigerant leakage detection system 10 first air conditioner 20 second air conditioner 70 internet line 100 first local controller 110 first property 200 second local controller 210 second property 300 large capacity storage device 400 remote management computer 402 calculation Part 403 judgment part

Claims (8)

An acquisition device (100, 200) for acquiring operating state data of the air conditioner (10, 20);
A storage device (300) for storing the operation state data acquired by the acquisition device (100, 200) as refrigerant leakage detection data;
A detection device (400) for detecting refrigerant leakage in the air conditioner (10, 20) with reference to the refrigerant leakage detection data;
A refrigerant leakage detection system (3). The detection device (400) compares the current operation state data acquired by the acquisition device (100, 200) with at least a part of the refrigerant leakage detection data, thereby the air conditioner (10, 20). ) To detect refrigerant leakage in
The refrigerant leakage detection system (3) according to claim 1. The detection device (400) uses the current operation state data acquired by the acquisition device (100, 200) at the start of use of the air conditioner (10, 20) in the refrigerant leakage detection data. To the initial operating state data of the air conditioner (10, 20) in a predetermined period from
The refrigerant leak detection system (3) according to claim 2. The acquisition device (100, 200) is a device that manages the air conditioner (10, 20) in a property (110, 210) where the air conditioner (10, 20) is installed,
The storage device (300) and the detection device (400) are remote from the property (110, 210), and are connected to the acquisition device (100, 200) via an Internet line (70), a dedicated line, or a telephone line. Connected,
The refrigerant leakage detection system (3) according to any one of claims 1 to 3. The detection device (400)
A calculation unit (402) for calculating a Mahalanobis distance of the current operation state data acquired by the acquisition device (100, 200) with reference to the at least part of the refrigerant leakage detection data;
A determination unit (403) that determines that the refrigerant is leaking when the Mahalanobis distance is equal to or greater than a predetermined value, and determines that the refrigerant is not leaked when the Mahalanobis distance is smaller than the predetermined value;
Having
The refrigerant leak detection system (3) according to claim 2. The operating state data relates to at least one of the degree of supercooling, the degree of superheating, the low pressure, the high pressure, the outside temperature, the room temperature, and the compressor speed of the refrigeration cycle of the air conditioner (10, 20).
The refrigerant leak detection system (3) according to any one of claims 1 to 5. A first acquisition device (100) for acquiring operating state data of the first air conditioner (10);
A second acquisition (200) device for acquiring operating state data of a second air conditioner (20) similar to the first air conditioner (10);
Operation state data of the first air conditioner (10) acquired by the first acquisition device (100) and operation state of the second air conditioner (20) acquired by the second acquisition device (200). A storage device (300) for storing data;
The second air conditioning stored in the storage device (300) when the amount of operating state data of the first air conditioning device (10) stored in the storage device (300) is insufficient. A detection device (400) for detecting refrigerant leakage in the first air conditioner (10) with reference to operating state data of the device (20);
A refrigerant leakage detection system (3). The detection device (400) is stored in the storage device (300) when the amount of operation state data of the first air conditioner (10) stored in the storage device (300) is not insufficient. The refrigerant leakage in the first air conditioner (10) is detected with reference to the operation state data of the first air conditioner (10).
The refrigerant leak detection system (3) according to claim 7.

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