WO2020115935A1 - Système de conditionnement d'air - Google Patents

Système de conditionnement d'air Download PDF

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Publication number
WO2020115935A1
WO2020115935A1 PCT/JP2019/024316 JP2019024316W WO2020115935A1 WO 2020115935 A1 WO2020115935 A1 WO 2020115935A1 JP 2019024316 W JP2019024316 W JP 2019024316W WO 2020115935 A1 WO2020115935 A1 WO 2020115935A1
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WIPO (PCT)
Prior art keywords
unit
indoor
air conditioning
heat exchanger
degree
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PCT/JP2019/024316
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English (en)
Japanese (ja)
Inventor
和田　誠
康敬 落合
一宏 小松
宣明 田崎
義統 中島
Original Assignee
三菱電機株式会社
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Publication of WO2020115935A1 publication Critical patent/WO2020115935A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Definitions

  • the present invention relates to an air conditioning system for air conditioning a target space.
  • an air conditioner in which a refrigerant circuit is formed by connecting a compressor, a heat source side heat exchanger, an expansion valve and a use side heat exchanger with a refrigerant pipe has been widely used.
  • various techniques have been proposed for correctly detecting a failure of a device forming a refrigerant circuit.
  • Patent Document 1 includes a compressor, a heat source side heat exchanger, an expansion valve, a utilization side heat exchanger, a water tank, and a control unit that controls these, and the control unit detects hot water supply for detecting a failure of the expansion valve.
  • a system is disclosed. In this hot water supply system, the control unit determines that the expansion valve has failed and stops the compressor when the difference between the temperature on the discharge side of the compressor and the target value exceeds a certain value.
  • Patent Document 1 in the method described in Patent Document 1, for example, in a multi-connection type air conditioner in which a plurality of indoor units are connected to one outdoor unit, it is possible to detect that the expansion valve has failed, but which indoor unit It is difficult to identify whether the expansion valve provided in the unit has failed. Further, when the number of failed expansion valves is small, the failure may not be detected, and the failure detection accuracy is poor.
  • the present invention has been made in view of the above problems, and an object thereof is to provide an air conditioning system capable of accurately detecting a failure of an expansion valve.
  • the air conditioning system of the present invention is an air conditioning system in which an outdoor unit including a compressor and an outdoor heat exchanger and an indoor unit including an expansion valve and an indoor heat exchanger are connected by piping, and in an air conditioning operation.
  • a difference value calculation unit that calculates a difference value with the target value
  • a difference value determination unit that determines that the expansion valve has a failure when the difference value exceeds a set threshold value. Parts.
  • the air conditioning system of the present invention by determining whether or not the expansion valve has a failure depending on the magnitude of the difference in the degree of superheat or the degree of subcooling with respect to the target value, the failure of the expansion valve is detected. It can be detected accurately.
  • FIG. 3 is a functional block diagram showing an example of a configuration of a system control unit in FIG. 1.
  • 6 is a flowchart showing an example of the flow of failure detection processing by the system control unit of FIG. 1.
  • 6 is a flowchart showing an example of the flow of failure detection processing by the system control unit of FIG. 1.
  • It is the schematic which shows an example of the installation state of the air conditioning system with respect to the air conditioning target space.
  • FIG. 1 is a schematic diagram showing an example of the configuration of the air conditioning system 100 according to the first embodiment.
  • the air conditioning system 100 includes an outdoor unit 1, indoor units 2a and 2b, and a system control unit 3.
  • the outdoor unit 1 and the indoor units 2a and 2b are connected by a refrigerant pipe 4.
  • the outdoor unit 1, the indoor units 2a and 2b, and the system control unit 3 are electrically connected.
  • the refrigerant pipe 4 is made of, for example, a copper pipe, through which the refrigerant flows.
  • the refrigerant pipe 4 may be heat-insulated by being wound with a heat insulating material.
  • the invention is not limited to this, and one indoor unit or three or more indoor units may be connected.
  • the outdoor unit 1 may be plural.
  • the outdoor unit 1 includes a compressor 11, a refrigerant flow switching device 12, an outdoor heat exchanger 13, an outdoor fan 14, and an outdoor unit controller 10.
  • the outdoor unit 1 also includes a high pressure sensor 15 and a low pressure sensor 16.
  • the compressor 11 sucks a low-temperature low-pressure refrigerant, compresses the sucked refrigerant, and discharges a high-temperature high-pressure refrigerant.
  • the compressor 11 is composed of, for example, an inverter compressor whose capacity, which is a delivery amount per unit time, is controlled by changing an operating frequency.
  • the operating frequency of the compressor 11 is controlled by the outdoor unit controller 10 so that the evaporation temperature becomes constant.
  • the operating frequency of the compressor 11 is controlled by the outdoor unit controller 10 so that the condensing temperature becomes constant.
  • the refrigerant flow switching device 12 is, for example, a four-way valve, and switches between the cooling operation and the heating operation by switching the flowing direction of the refrigerant.
  • the refrigerant flow switching device 12 switches to the state shown by the solid line in FIG. 1 during the cooling operation.
  • the refrigerant flow path switching device 12 switches to the state shown by the dotted line in FIG. 1 during the heating operation.
  • the switching of the flow path in the refrigerant flow path switching device 12 is controlled by the outdoor unit control unit 10.
  • the outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant.
  • the outdoor heat exchanger 13 functions as a condenser that radiates the heat of the refrigerant to the outdoor air and condenses the refrigerant during the cooling operation. Further, the outdoor heat exchanger 13 functions as an evaporator that evaporates the refrigerant during the heating operation and cools the outdoor air by the heat of vaporization at that time.
  • the outdoor fan 14 supplies outdoor air to the outdoor heat exchanger 13.
  • the rotation speed of the outdoor fan 14 is controlled by the outdoor unit controller 10. By controlling the rotation speed, the amount of air blown to the outdoor heat exchanger 13 is adjusted.
  • the high pressure sensor 15 is provided on the discharge side of the compressor 11 and detects the discharge pressure of the refrigerant discharged from the compressor 11.
  • the low pressure sensor 16 is provided on the suction side of the compressor 11 and detects the suction pressure value of the refrigerant sucked into the compressor 11.
  • a piezoelectric element or the like that converts the detected pressure into a voltage and outputs it as an electric signal is used.
  • the outdoor unit control unit 10 controls the operating frequency of the compressor 11, the flow passage of the refrigerant flow passage switching device 12, and the rotation speed of the outdoor fan 14.
  • the outdoor unit control unit 10 realizes various functions by executing software on an arithmetic unit such as a microcomputer, or is configured by hardware such as a circuit device that realizes various functions.
  • the configuration of the outdoor unit 1 is not limited to the example shown in FIG. 1, and for example, a subcooling heat exchanger, an expansion valve, an accumulator, etc. may be provided. Further, for example, the refrigerant flow path switching device 12 may not be provided. In this case, the air conditioning system 100 is dedicated to the cooling operation.
  • the indoor unit 2a includes an indoor heat exchanger 21a, an expansion valve 22a, an indoor fan 23a, and an indoor unit controller 20a.
  • the indoor unit 2b includes an indoor heat exchanger 21b, an expansion valve 22b, an indoor fan 23b, and an indoor unit controller 20b.
  • the indoor units 2a and 2b have the same structure. Therefore, hereinafter, only the configuration of the indoor unit 2a will be described, and description of the configuration of the indoor unit 2b will be omitted.
  • the indoor heat exchanger 21a exchanges heat between the air and the refrigerant. As a result, heating air or cooling air supplied to the air-conditioned space is generated.
  • the indoor heat exchanger 21a functions as an evaporator during cooling operation and cools the air in the air-conditioned space to perform cooling. Further, the indoor heat exchanger 21a functions as a condenser during heating operation, and heats the air in the air-conditioned space to perform heating.
  • the expansion valve 22a expands the refrigerant.
  • the expansion valve 22a is, for example, a valve such as an electronic expansion valve capable of controlling the opening degree.
  • the opening degree of the expansion valve 22a is controlled by the indoor unit controller 20a so that the outlet superheat degree of the indoor heat exchanger 21a reaches the superheat degree target value.
  • the opening degree of the expansion valve 22a is controlled by the indoor unit control unit 20a so that the outlet subcooling degree of the indoor heat exchanger 21a becomes the subcooling degree target value.
  • the indoor fan 23a supplies air to the indoor heat exchanger 21a.
  • the rotation speed of the indoor fan 23a is controlled by the indoor unit controller 20a. By controlling the rotation speed, the amount of air blown to the indoor heat exchanger 21a is adjusted.
  • the indoor unit 2a further includes a gas temperature sensor 24a and a liquid temperature sensor 25a.
  • the indoor unit 2b further includes a gas temperature sensor 24b and a liquid temperature sensor 25b.
  • the gas temperature sensor 24a is provided on the refrigerant outlet side of the indoor heat exchanger 21a during the cooling operation, and detects the temperature of the gas refrigerant flowing into and out of the indoor heat exchanger 21a.
  • the liquid temperature sensor 25a is provided on the refrigerant inlet side of the indoor heat exchanger 21a during the cooling operation, and detects the temperature of the liquid refrigerant flowing into and out of the indoor heat exchanger 21a.
  • thermocouples are used as the gas temperature sensor 24a and the liquid temperature sensor 25a.
  • the indoor unit controller 20a receives a command from the system controller 3 to control the opening degree of the expansion valve 22a and the rotation speed of the indoor fan 23a.
  • the indoor unit control unit 20a has various functions realized by executing software on a computing device such as a microcomputer, or is configured by hardware such as a circuit device that realizes various functions.
  • the compressor 11, the refrigerant flow switching device 12, the outdoor heat exchanger 13, the expansion valves 22a and 22b, and the indoor heat exchangers 21a and 21a are annularly formed by the refrigerant pipe 4.
  • a refrigerant circuit is formed by being connected.
  • System control unit 3 receives a driving instruction from a user and sends a command to the outdoor unit control unit 10 and the indoor unit control units 20a and 20b based on the input instruction. In addition, in the first embodiment, the system control unit 3 performs a failure detection process for the expansion valves 22a and 22b.
  • the system control unit 3 includes a driving state determination unit 31, a target value acquisition unit 32, a target value comparison unit 33, a difference value calculation unit 34, a difference value determination unit 35, a driving control unit 36, and a notification unit. 37, a timer 38, and a storage unit 39.
  • the system control unit 3 realizes various functions by executing software on an arithmetic device such as a microcomputer, or is configured by hardware such as a circuit device that realizes various functions.
  • the operation state determination unit 31 determines the operation state of the air conditioning system 100 based on the operation information.
  • the operating state includes, for example, an operating state of each unit such as the compressor 11 and an operating mode such as a cooling operation or a heating operation.
  • the operating state determination unit 31 determines whether the compressor 11 is operating, and also determines the operating mode when the air conditioning system 100 is operating.
  • the target value acquisition unit 32 acquires the superheat degree target value during the cooling operation and the supercooling degree target value during the heating operation at preset timings based on the notification from the operation state determination unit 31 and the timer 38. ..
  • the target value comparison unit 33 compares the superheat degree target value or the supercooling degree target value at a plurality of timings acquired by the target value acquisition unit 32, and determines whether the values match.
  • the superheat degree target value and the supercooling degree target value are values determined by information of a driving instruction from the user to the system control unit 3.
  • the difference value calculation unit 34 calculates a superheat degree difference value which is a difference between the calculated outlet superheat degree and the calculated superheat degree target value. Further, the difference value calculation unit 34 calculates a supercooling degree difference value which is a difference between the calculated outlet supercooling degree and the supercooling degree target value.
  • the difference value determination unit 35 compares the superheat degree difference value or the supercooling degree difference value with a set threshold value stored in advance in the storage unit 39, and determines whether or not the expansion valves 22a and 22b have a failure. Specifically, the difference value determination unit 35 determines that the expansion valves 22a and 22b have a failure when the superheat degree difference value or the supercooling degree difference value exceeds the set threshold value.
  • the operation control unit 36 When the difference value determination unit 35 detects a failure of the expansion valves 22a and 22b, the operation control unit 36 notifies the notification unit 37 of information indicating the failure of the expansion valves 22a and 22b. Further, the operation control unit 36 outputs a control signal for controlling each unit in the air conditioning system 100 so that the operation mode is set to the performance deterioration suppression mode.
  • the notification unit 37 notifies the failure of the expansion valves 22a and 22b based on the notification from the operation control unit 36 when it is determined that the expansion valves 22a and 22b have failed.
  • the notification unit 37 has, for example, a display unit (not shown), and displays information indicating that the expansion valves 22a and 22b are out of order on the display unit. Note that the notification by the notification unit 37 is not limited to this, and may be, for example, a voice notification, or may be notified to a maintenance company in a remote place by communication or the like.
  • the timer 38 measures the elapsed time t of the current driving mode based on the judgment result of the driving state judging unit 31. When the measured elapsed time t reaches the set time T, the timer 38 notifies the target value acquisition unit 32 that the elapsed time t has reached the set time T.
  • the storage unit 39 stores various types of information used when processing is performed by each unit of the system control unit 3. Various types of information stored in the storage unit 39 are read in response to requests from each unit.
  • the storage unit 39 stores in advance information used when the difference value calculation unit 34 calculates the outlet supercooling degree, a setting threshold value used in the difference value determination unit 35, and the like.
  • the storage unit 39 also stores the superheat degree target value and the supercooling degree target value acquired by the target value acquisition unit 32.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 via the refrigerant flow switching device 12.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the outdoor heat exchanger 13 exchanges heat with the outdoor air taken in by the outdoor fan 14 and condenses while radiating heat, and becomes a high-pressure liquid refrigerant that flows out of the outdoor heat exchanger 13. ..
  • the high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 13 flows out of the outdoor unit 1 and flows into each of the indoor units 2 a and 2 b via the refrigerant pipe 4.
  • the high-pressure liquid refrigerant that has flowed into the indoor unit 2a is decompressed by the expansion valve 22a to become a low-temperature low-pressure gas-liquid two-phase refrigerant that flows into the indoor heat exchanger 21a.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant flowing into the indoor heat exchanger 21a exchanges heat with the indoor air taken in by the indoor fan 23a, absorbs heat and evaporates, and becomes a low-pressure gas refrigerant from the indoor heat exchanger 21a. leak.
  • the high-pressure liquid refrigerant that has flowed into the indoor unit 2b is decompressed by the expansion valve 22b to become a low-temperature low-pressure gas-liquid two-phase refrigerant that flows into the indoor heat exchanger 21b.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant flowing into the indoor heat exchanger 21b exchanges heat with the indoor air taken in by the indoor fan 23b to absorb and evaporate, and becomes a low-pressure gas refrigerant from the indoor heat exchanger 21b. leak.
  • the low-pressure gas refrigerant flowing out from each of the indoor heat exchangers 21a and 21b flows out from the indoor units 2a and 2b, merges with each other, and flows into the outdoor unit 1.
  • the low-pressure gas refrigerant that has flowed into the outdoor unit 1 passes through the refrigerant flow path switching device 12 and is sucked into the compressor 11.
  • Heating operation During the heating operation, the refrigerant flow switching device 12 is switched so that the discharge side of the compressor 11 and the indoor units 2a and 2b are connected, as shown by the broken line in FIG. Then, the low-temperature low-pressure refrigerant is compressed by the compressor 11 to be discharged as high-temperature high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows out of the outdoor unit 1 via the refrigerant flow path switching device 12 and flows into the indoor unit 2a and the indoor unit 2b, respectively.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor unit 2a flows into the indoor heat exchanger 21a.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor heat exchanger 21a exchanges heat with the indoor air taken in by the indoor fan 23a, condenses while radiating heat, and becomes a high-pressure liquid refrigerant that flows out from the indoor heat exchanger 21a. ..
  • the high-pressure liquid refrigerant flowing out from the indoor heat exchanger 21a is decompressed by the expansion valve 22a to become a low-temperature low-pressure gas-liquid two-phase refrigerant, and flows out from the indoor unit 2a.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor unit 2b flows into the indoor heat exchanger 21b.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor heat exchanger 21b exchanges heat with the indoor air taken in by the indoor fan 23b, condenses while radiating heat, and becomes a high-pressure liquid refrigerant that flows out of the indoor heat exchanger 21b. ..
  • the high-pressure liquid refrigerant flowing out from the indoor heat exchanger 21b is decompressed by the expansion valve 22b to become a low-temperature low-pressure gas-liquid two-phase refrigerant, and flows out from the indoor unit 2b.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant flowing out of each of the indoor units 2a and 2b merges and flows into the outdoor unit 1.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor unit 1 flows into the outdoor heat exchanger 13.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the outdoor air taken in by the outdoor fan 14, absorbs heat and evaporates, and becomes a low-pressure gas refrigerant from the outdoor heat exchanger 13. leak.
  • the low-pressure gas refrigerant flowing out of the outdoor heat exchanger 13 passes through the refrigerant flow switching device 12 and is sucked into the compressor 11.
  • the opening degree of the expansion valve 22a is controlled so that the outlet superheat degree SH 1 of the indoor heat exchanger 21a that functions as an evaporator becomes the superheat degree target value SH m1 .
  • the opening degree of the expansion valve 22a is controlled to be large.
  • the opening degree of the expansion valve 22a is controlled so as to be small.
  • the outlet superheat degree SH 1 is calculated by using the refrigerant outlet temperature of the indoor heat exchanger 21a detected by the gas temperature sensor 24a and the refrigerant inlet temperature of the indoor heat exchanger 21a detected by the liquid temperature sensor 25a, and the expression ( It is calculated based on 1).
  • the superheat target value SH m1 is a value determined by information on a driving instruction from the user to the system control unit 3.
  • Outlet superheat degree SH 1 gas temperature sensor value-liquid temperature sensor value (1)
  • the outlet superheat degree SH 1 is not limited to this, and may be calculated based on the equation (2) using the evaporation temperature ET 1 of the indoor heat exchanger 21a and the gas temperature sensor value.
  • the evaporation temperature ET 1 depends on the type of the refrigerant and the value of the liquid pressure sensor, for example, when a liquid pressure sensor that detects the pressure of the refrigerant flowing into the indoor heat exchanger 21a is provided instead of the liquid temperature sensor 25a. This is the value to be determined.
  • Outlet superheat degree SH 1 gas temperature sensor value-evaporation temperature ET 1 (2)
  • the expansion valve 22a the indoor heat exchanger outlet supercooling degree SC 1 of 21a functioning as a condenser is such that the degree of supercooling target value SC m1, opening degree is controlled.
  • the outlet supercooling degree SC 1 is is greater than the subcooling degree target value SC m1 (SC 1> SC m1 ), the opening degree is controlled so that the opening degree of the expansion valve 22a is increased.
  • the opening degree of the expansion valve 22a is controlled so as to be small.
  • the outlet supercooling degree SC 1 is calculated based on the equation (3) using the condensing temperature CT and the refrigerant inlet temperature of the indoor heat exchanger 21a detected by the gas temperature sensor 24a.
  • the subcooling degree target value SC m1 is a value determined by the information of the driving instruction from the user to the system control unit 3.
  • the condensation temperature CT is a value determined by the type of refrigerant and the pressure of the refrigerant flowing into the indoor heat exchanger 21a, and the value at this time is the value of the high pressure sensor 15.
  • Outlet supercooling degree SC 1 condensation temperature CT-gas temperature sensor value (3)
  • the failure detection process of the expansion valves 22a and 22b in the air conditioning system 100 will be described.
  • the state in which the expansion valves 22a and 22b have failed refers to a state in which the opening degrees of the expansion valves 22a and 22b cannot be normally controlled. Since the failure detection process is performed on the expansion valve 22b similarly to the expansion valve 22a, the failure detection process on the expansion valve 22a will be described here as an example.
  • FIGS. 3 and 4 are flowcharts showing an example of the flow of failure detection processing by the system control unit 3 of FIG.
  • symbols A to D indicate that the processing shifts to the corresponding symbols.
  • step S1 the operation state determination unit 31 determines the operation state of the air conditioning system 100.
  • the system control unit 3 starts the failure detection process of the expansion valve 22a.
  • step S2 the timer 38 starts measuring the elapsed time t of the current driving state based on the determination result of the driving state determination unit 31.
  • step S1; No the process returns to step S1.
  • step S3 the operation state determination unit 31 determines whether or not the current operation mode is cooling operation.
  • the process proceeds to step S4.
  • the system control unit 3 determines whether or not there is a change in the operating state, settings, etc. of the air conditioning system 100 by the processing of steps S4 to S7 below. Whether the operating condition or the like is changed in the air conditioning system 100 is determined by whether or not the temperature difference between the indoor temperature of the air-conditioned space and the set temperature that is the target value of the indoor temperature changes at two different timings. .. More specifically, the presence or absence of a change in the operating state or the like in the air conditioning system 100 is determined by, for example, whether or not the superheat degree target value SH m1 at two different timings is the same. In this case, "the superheat degree target value SH m1 is the same” includes a value within a range preset with respect to the superheat degree target value SH m1 .
  • step S4 the target value acquisition unit 32 acquires the superheat degree target value SH m1 at the time when the measurement of the elapsed time of the operating state is started.
  • step S5 the timer 38 determines whether or not the elapsed time t that started the measurement in step S2 has reached the set time T.
  • step S5; Yes the target value acquisition unit 32 acquires the superheat degree target value SH m1 at the set time T in step S6.
  • step S5; No the process returns to step S5, and the process of step S5 is repeated until the elapsed time t reaches the set time T.
  • step S7 the target value comparator 33, the target superheat degree SH m1 measurement starting point of the elapsed time obtained in Step S4, superheat degree target value when it reaches the acquired set time T in Step S6 SH m1 It is determined whether and are the same. This is performed to determine whether or not the operating state and settings of the air conditioning system 100 have been changed.
  • step S7 When the two superheat degree target values SH m1 are the same (step S7; Yes), the process proceeds to step S8. On the other hand, when the two superheat degree target values SH m1 are not the same (step S7; No), the process returns to step S1.
  • step S8 the difference value calculation unit 34 calculates the outlet superheat degree SH 1 of the indoor heat exchanger 21a based on the detection results of the gas temperature sensor 24a and the liquid temperature sensor 25a. Further, the difference value calculation unit 34 calculates a superheat degree difference value ⁇ SH 1 which is a difference between the calculated outlet superheat degree SH 1 and the calculated superheat degree target value SH m1 .
  • the superheat difference value ⁇ SH 1 is a value for determining to what extent the outlet superheat SH 1 approaches the superheat target value SH m1 when the cooling operation is continued for at least the set time T. Is. Even after the cooling operation has elapsed for the set time T, if the superheat degree difference value ⁇ SH 1 is higher than the set threshold value, the outlet superheat degree SH 1 of the indoor heat exchanger 21a becomes the superheat target value SH m1. Moreover, it can be determined that the opening degree of the expansion valve 22a is not normally controlled and is out of order.
  • step S9 the difference value determination unit 35 determines whether or not the superheat degree difference value ⁇ SH 1 exceeds the set threshold value X.
  • the superheat degree difference value ⁇ SH 1 is equal to or less than the set threshold value X (step S9; No)
  • a series of processes ends.
  • step S9 When the superheat difference value ⁇ SH 1 exceeds the set threshold value X (step S9; Yes), the difference value determination unit 35 determines that the expansion valve 22a has a failure. Then, the notification unit 37 notifies the maintenance company of the failure of the expansion valve 22a in step S10. Further, the operation control unit 36 sets the operation mode to the performance deterioration suppressing mode in step S11.
  • step S3 if the operation mode is not the cooling operation (step S3; No), the process proceeds to step S12.
  • step S12 the operation state determination unit 31 determines whether the current operation mode is heating operation.
  • step S12 If the current operation mode is heating operation (step S12; Yes), the process proceeds to step S13. Further, when the current operation mode is not the heating operation (step S12; No), the process returns to step S1.
  • the system control unit 3 determines whether or not there is a change in the operating state, settings, etc. of the air conditioning system 100 through the processing in steps S13 to S16 below. Whether the operating state or the like is changed in the air conditioning system 100 is determined by whether or not the temperature difference between the indoor temperature of the air-conditioned space and the set temperature changes at two different timings. More specifically, the presence or absence of a change in the operating state or the like in the air conditioning system 100 is determined by, for example, whether or not the subcooling degree target value SC m1 at two different timings is the same. In addition, in this case, "the same subcooling degree target value SC m1 " shall include the value within the range preset with respect to the subcooling degree target value SC m1 .
  • step S13 the target value acquisition unit 32 acquires the subcooling degree target value SC m1 at the time when the measurement of the elapsed time of the operating state is started.
  • step S14 the timer 38 determines whether or not the elapsed time t at which the measurement is started in step S2 has reached the set time T.
  • the target value acquisition unit 32 acquires the subcooling degree target value SC m1 at the set time T in step S15.
  • step S14 when the elapsed time t has not reached the set time T (step S14; No), the process returns to step S14, and the process of step S14 is repeated until the elapsed time t reaches the set time T.
  • step S16 the target value comparison unit 33 determines the subcooling degree target value SC m1 at the start of measuring the elapsed time acquired in step S13 and the subcooling degree target value at the time when the set time T acquired in step S15 is reached. It is determined whether or not SC m1 is the same. When the two subcooling degree target values SC m1 are the same (step S16; Yes), the process proceeds to step S17. On the other hand, when the two subcooling degree target values SC m1 are not the same (step S16; No), the process returns to step S1.
  • step S17 the difference value calculation unit 34 calculates the outlet supercooling degree SC 1 of the indoor heat exchanger 21a based on the detection results of the gas temperature sensor 24a and the liquid temperature sensor 25a. In addition, the difference value calculation unit 34 calculates a supercooling degree difference value ⁇ SC 1 which is a difference between the calculated outlet supercooling degree SC 1 and the supercooling degree target value SC m1 .
  • the degree of supercooling difference DerutaSC similar to the superheat difference value .DELTA.Sh 1, when the cooling operation is continued for at least the set time T, the degree of supercooling target extent to which the outlet supercooling degree SC 1 This is a value for determining whether the value is close to the value SC m1 .
  • step S18 the difference value determination unit 35 determines whether or not the supercooling degree difference value ⁇ SC 1 exceeds the set threshold value Y.
  • the difference value determination unit 35 determines that the expansion valve 22a is out of order, and the process proceeds to step S10.
  • the superheat degree difference value ⁇ SH 1 is calculated as an instantaneous value at the time when the elapsed time t of operation has passed the set time T, but this is not the only example. Absent.
  • a plurality of superheat degree difference values ⁇ SH 1 may be calculated at a set time interval while the elapsed time t of operation has passed the set time T, and may be obtained as an average value of the plurality of calculated values.
  • the air conditioning target space can be air-conditioned until the expansion valves 22a and 22b are repaired or replaced.
  • the performance degradation suppression mode which is the operation mode when the expansion valves 22a and 22b fail, will be described.
  • the performance deterioration suppression mode is an operation mode for maintaining air conditioning as much as possible even in a state where the opening degrees of the expansion valves 22a and 22b are not normally controlled.
  • the operating frequency of the compressor 11 is controlled so that the evaporation temperature or the condensation temperature of the indoor heat exchangers 21a and 21b becomes constant.
  • the operating frequency of the compressor 11 is controlled so that the suction temperature becomes the set temperature. That is, when the operation is performed in the performance deterioration suppression mode, the compressor 11 is controlled so that the operating frequency of the compressor 11 is limited.
  • the suction temperature is the temperature of the air taken into the indoor heat exchangers 21a and 21b, and is the indoor temperature of the air-conditioned space.
  • the set temperature is a temperature set by the user.
  • FIG. 5 is a schematic diagram showing an example of the installation state of the air conditioning system 100 in the air conditioning target space 50.
  • FIG. 6 is a schematic diagram showing another example of the installation state of the air conditioning system 100 in the air conditioning target space 50.
  • the plurality of indoor units 2a and 2b included in the air conditioning system 100 are installed in one air-conditioned space 50.
  • the system control unit 3 controls the operations of the indoor units 2a and 2b so that the sum of the capacities is maximized by the operation in the performance deterioration suppressing mode.
  • the air conditioning target space 50 is partitioned into a plurality of air conditioning target spaces 50a and 50b, and each of the plurality of indoor units 2a and 2b is provided in each of the plurality of air conditioning target spaces 50a and 50b.
  • the system control unit 3 controls the operation of the indoor units 2a and 2b so that the capacity of either one of the indoor units 2a and 2b is maximized by the operation in the performance deterioration suppressing mode. It should be noted that which of the indoor units 2a and 2b is to be operated at maximum capacity is determined by the environmental conditions.
  • the failure of the expansion valves 22a and 22b can be detected.
  • the failure of the expansion valves 22a and 22b is detected based on the difference value for each of the indoor heat exchangers 21a and 21b. Therefore, even if the air conditioning system 100 is a multi-connection system in which a plurality of indoor units are connected to one outdoor unit, it is possible to accurately detect a failure of the expansion valve.
  • the degree of superheat is calculated based on the temperatures detected by the gas temperature sensors 24a and 24b and the liquid temperature sensors 25a and 25b during the cooling operation.
  • the degree of supercooling is calculated based on the temperatures detected by the gas temperature sensors 24a and 24b and the pressure detected by the high pressure sensor 15 during the heating operation.
  • the difference value is calculated. That is, the difference value is calculated when the operating state, the setting, and the like have not been changed since the operation of the air conditioning system 100 was started.
  • the operation in the performance deterioration suppressing mode is performed. As a result, the operation can be continued until the expansion valves 22a and 22b in which the failure is detected are repaired or replaced.
  • the present invention is not limited to the above-described first embodiment of the present invention, and various modifications and applications are made without departing from the gist of the present invention. Is possible.
  • the failure detection process is performed on the expansion valves 22a and 22b provided in the indoor units 2a and 2b
  • this is not limited to this example.
  • the failure detection process described above may be similarly performed on the expansion valve of the outdoor unit 1.
  • the operation is performed in the performance deterioration suppressing mode when the expansion valves 22a and 22b fail, but this is not limited to this example.
  • the degree of failure of the expansion valves 22a and 22b is such that air conditioning of the air-conditioned space 50 is not hindered, the air conditioning system 100 does not necessarily have to operate in the performance degradation suppression mode.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un système de conditionnement d'air, dans lequel une unité extérieure pourvue d'un compresseur et d'un échangeur de chaleur extérieur, et une unité intérieure pourvue d'une vanne de détente et d'un échangeur de chaleur intérieur sont reliées par une tuyauterie, ledit système de conditionnement d'air étant pourvu d'une unité de commande de système comprenant : une unité d'acquisition de valeur cible pour acquérir une valeur cible pour un degré de surchauffe de l'échangeur de chaleur intérieur lorsqu'une opération de refroidissement d'espace est en cours d'exécution, et pour acquérir une valeur cible pour un degré de sous-refroidissement de l'échangeur de chaleur intérieur lorsqu'une opération de chauffage d'espace est en cours d'exécution ; une unité de calcul de valeur de différence pour calculer une valeur de différence entre le degré de surchauffe ou le degré de sous-refroidissement et la valeur cible ; et une unité de détermination de valeur de différence qui détermine que la vanne de détente est défaillante si la valeur de différence dépasse un seuil défini.
PCT/JP2019/024316 2018-12-06 2019-06-19 Système de conditionnement d'air WO2020115935A1 (fr)

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CN111765593A (zh) * 2020-07-07 2020-10-13 珠海格力电器股份有限公司 一种空调节流元器件故障预警方法和空调
CN112524781A (zh) * 2020-12-07 2021-03-19 佛山市顺德区美的电子科技有限公司 一种控制方法、装置、设备及存储介质
JP2023039061A (ja) * 2021-09-08 2023-03-20 ダイキン工業株式会社 空気調和システム
WO2024040915A1 (fr) * 2022-08-22 2024-02-29 青岛海信日立空调系统有限公司 Climatiseur

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GB2610983C (en) * 2020-07-13 2024-04-17 Mitsubishi Electric Corp Air-conditioning apparatus
CN115247858B (zh) * 2022-05-16 2024-04-26 美的集团武汉暖通设备有限公司 空调器及其控制方法、计算机可读存储介质
CN115899951A (zh) * 2022-12-23 2023-04-04 珠海格力电器股份有限公司 排气感温包脱落的检测方法、装置、设备和空调机组

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JPS6129666A (ja) * 1984-02-28 1986-02-10 シャープ株式会社 空気調和機
JPH02282673A (ja) * 1989-04-24 1990-11-20 Daikin Ind Ltd 電子膨張弁の故障診断装置
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JP2017154521A (ja) * 2016-02-29 2017-09-07 サンデン・オートモーティブクライメイトシステム株式会社 車両用空気調和装置

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Publication number Priority date Publication date Assignee Title
CN111765593A (zh) * 2020-07-07 2020-10-13 珠海格力电器股份有限公司 一种空调节流元器件故障预警方法和空调
CN112524781A (zh) * 2020-12-07 2021-03-19 佛山市顺德区美的电子科技有限公司 一种控制方法、装置、设备及存储介质
CN112524781B (zh) * 2020-12-07 2022-06-24 佛山市顺德区美的电子科技有限公司 一种控制方法、装置、设备及存储介质
JP2023039061A (ja) * 2021-09-08 2023-03-20 ダイキン工業株式会社 空気調和システム
WO2024040915A1 (fr) * 2022-08-22 2024-02-29 青岛海信日立空调系统有限公司 Climatiseur

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