EP4160118A1 - Système de climatisation - Google Patents

Système de climatisation Download PDF

Info

Publication number
EP4160118A1
EP4160118A1 EP21814271.9A EP21814271A EP4160118A1 EP 4160118 A1 EP4160118 A1 EP 4160118A1 EP 21814271 A EP21814271 A EP 21814271A EP 4160118 A1 EP4160118 A1 EP 4160118A1
Authority
EP
European Patent Office
Prior art keywords
control
outdoor
unit
refrigerant
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21814271.9A
Other languages
German (de)
English (en)
Other versions
EP4160118A4 (fr
Inventor
Naoki Maekawa
Akihiro Shigeta
Shunichi Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP4160118A1 publication Critical patent/EP4160118A1/fr
Publication of EP4160118A4 publication Critical patent/EP4160118A4/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started

Definitions

  • the present invention relates to air conditioning systems.
  • Patent Literature 1 discloses a technique to store refrigerant in an outdoor unit by pump-down operation, and recover the stored refrigerant by a refrigerant recovery machine.
  • Patent Literature 1 Japanese Patent Laid-Open No. 2000-199660
  • Patent Literature 1 in the case in which a large amount of refrigerant that exceeds a storable amount of the outdoor unit is charged in the air conditioner, it is not possible to recover the refrigerant charged in the air conditioner in a rapid manner because the refrigerant is recovered through the refrigerant recovery machine without performing pump-down operation.
  • an object of the present invention is to provide an air conditioning system capable of performing refrigerant recovery in a rapid manner by using pump-down operation of outdoor units even in the case in which a large amount of refrigerant that exceeds a storable amount of the outdoor unit is charged in the air conditioner.
  • an aspect of the present invention is an air conditioning system including: an air conditioner including an indoor unit and a plurality of outdoor units connected to the indoor unit; and a controller that controls the air conditioner, in which the controller alternately executes first control in which one of the outdoor units is caused to execute pump-down operation and in which another one of the outdoor units is put into a state where refrigerant is allowed to be recovered by a refrigerant recovery machine and second control in which the outdoor unit that executes the pump-down operation in the first control is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine and in which the outdoor unit that is put, in the first control, into the state where the refrigerant is allowed to be recovered is caused to execute pump-down operation.
  • a first aspect of the invention is an air conditioning system including: an air conditioner including an indoor unit and a plurality of outdoor units connected to the indoor unit; and a controller that controls the air conditioner, in which the controller alternately executes first control in which one of the outdoor units is caused to execute pump-down operation and in which another one of the outdoor units is put into a state where refrigerant is allowed to be recovered by a refrigerant recovery machine and second control in which the outdoor unit that executes the pump-down operation in the first control is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine and in which the outdoor unit that is put, in the first control, into the state where the refrigerant is allowed to be recovered is caused to execute pump-down operation.
  • This configuration makes it possible to execute pump-down operation with a plurality of outdoor units, and also while one of the outdoor units is executing the pump-down operation, another outdoor unit can be, in parallel, put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine.
  • another outdoor unit can be, in parallel, put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine.
  • the outdoor units each have a compressor and a high-pressure sensor that detects the pressure of the refrigerant discharged by the compressor, and the controller, in a case in which a detection value of the high-pressure sensor exceeds a specified threshold, switches between execution of the first control and execution of the second control.
  • This configuration makes it possible to switch the outdoor units that execute pump-down operation before effects of the refrigerant stored by the pump-down operation occur on the discharge side of the compressor.
  • the air conditioning system even in the case in which a large amount of refrigerant that exceeds a storable amount of the outdoor unit is charged in the air conditioner, it is possible to switch control before the capacity within which the outdoor unit can perform pump-down operation is exceeded and perform refrigerant recovery in a rapid manner by using the pump-down operation of the outdoor units.
  • the outdoor units each have a compressor and a low-pressure sensor that detects the pressure of the refrigerant flowing into the compressor, and the controller, in a case in which a detection value of the low-pressure sensor is smaller than or equal to a specified threshold, finishes execution of the first control and the second control.
  • the controller in a case in which the number of the outdoor units included in the air conditioner is three or more, selects two or more of the outdoor units in descending order of the performance of the outdoor units as the outdoor units that execute pump-down operation in either the first control or the second control and executes the first control and the second control with the selected two or more outdoor units.
  • the air conditioner includes three or more outdoor units, it is possible to cause the outdoor units capable of storing refrigerant in a more rapid manner to execute pump-down operation.
  • the air conditioner includes three or more outdoor units, it is possible to perform refrigerant recovery in a rapid manner and efficiently by using the pump-down operation of outdoor units.
  • Figure 1 is a diagram showing the configuration of an air conditioning system 1 according to the first embodiment.
  • the air conditioning system 1 is a system installed at large buildings and facilities such as schools. As shown in Figure 1 , the air conditioning system 1 includes an air conditioner 2 and a control device 3.
  • the air conditioner 2 includes two outdoor units 4, a first outdoor unit 4A and a second outdoor unit 4B, and two indoor units 5.
  • the first outdoor unit 4A and the second outdoor unit 4B have the same or a similar configuration including their control configurations.
  • identifiers such as "first” and "second”
  • first and second are omitted in the names of the constituents, and also, only numerals are used for the symbols of the constituents and the suffixes A and B are omitted.
  • a first compressor 40A and a second compressor 40B are not discriminated, they are referred to as a "compressor 40".
  • first-outdoor-unit controller 400A and a second-outdoor-unit controller 400B are not discriminated, they are referred to as an "outdoor-unit controller 400".
  • the names of the constituents in the first outdoor unit 4A and the second outdoor unit 4B are discriminated, the names of the constituents in the first outdoor unit 4A will have the identifier "first" and their symbols will have the suffix A, and the names of the constituents in the second outdoor unit 4B will have the identifier "second" and their symbol will have the suffix B.
  • the drawings include symbols that allow the constituents of the first outdoor unit 4A and the second outdoor unit 4B to be discriminated.
  • the indoor units 5 are each connected in parallel to the two outdoor units 4 with refrigerant pipes 101 and 102.
  • the air conditioner 2 has a refrigeration cycle formed by the two outdoor units 4, the two indoor units 5, and the refrigerant pipes 101 and 102. Then, the air conditioner 2 runs the refrigerant compressed by the outdoor units 4 between the outdoor units 4 and the indoor units 5 and air-conditions air-conditioning rooms with the indoor units 5 installed, by using the indoor units 5.
  • the outdoor unit 4 includes a compressor 40, a gas-liquid separator 41, a four-way valve 42, an outdoor heat exchanger 44 having an outdoor blower fan 43, and an electromagnetic valve 45.
  • the suction side of the compressor 40 is connected to the gas-liquid separator 41 that supplies the compressor 40 with gas refrigerant, and the discharge side of the compressor 40 is connected to the four-way valve 42.
  • the four-way valve 42 is connected to the outdoor heat exchanger 44 having the outdoor blower fan 43.
  • the outdoor heat exchanger 44 is configured to exchange heat between the air sent from the outdoor blower fan 43 and the refrigerant.
  • the outdoor heat exchanger 44 is connected to the electromagnetic valve 45.
  • the electromagnetic valve 45 is located on the refrigerant pipe 101.
  • the outdoor unit 4 also includes a high-pressure sensor 46 and a low-pressure sensor 47.
  • the high-pressure sensor 46 which is located on the discharge side of the compressor 40 and between the compressor 40 and the outdoor heat exchanger 44, detects the pressure of the refrigerant discharged from the compressor 40.
  • the high-pressure sensor 46 outputs detection values to an outdoor-unit controller 400.
  • the low-pressure sensor 47 which is located on the suction side of the compressor 40 and between the compressor 40 and the gas-liquid separator 41, detects the pressure of the refrigerant flowing into the compressor 40.
  • the low-pressure sensor 47 outputs detection values to the outdoor-unit controller 400.
  • the indoor unit 5 includes an indoor heat exchanger 51 having an indoor blower fan 50, and an indoor expansion valve 52.
  • the indoor expansion valve 52 has one end connected to the indoor heat exchanger 51 and the other end connected to the refrigerant pipe 101.
  • the refrigerant pipe 101 is connected to one refrigerant recovery machine 6.
  • the refrigerant recovery machine 6 recovers refrigerant from the air conditioner 2 by recovering the refrigerant from the refrigerant pipe 101.
  • the control device 3 is a device that controls the air conditioner 2.
  • the control device 3 of the present embodiment controls the outdoor units 4 included in the air conditioner 2.
  • FIG. 2 is a block diagram showing the control configurations of the control device 3, the outdoor units 4, and the indoor units 5.
  • control configuration of the control device 3 will be described.
  • the control device 3 includes a control-device controller 30, a control-device communication unit 31, a control-device input unit 32, and a control-device display unit 33.
  • the control-device controller 30 includes a control-device processor 310, which is a processor such as a CPU or an MPU that executes programs, and a control-device storage unit 320 and controls each unit in the control device 3.
  • the control-device controller 30 executes various processes by cooperation of hardware and software so that the control-device processor 310 reads a control program 321 stored in the control-device storage unit 320 and execute processes.
  • the control-device storage unit 320 has a storage area to store programs to be executed by the control-device processor 310 and data to be processed by the control-device processor 310.
  • the control-device storage unit 320 stores the control program that the control-device processor 310 executes, setting data related to various kinds of setting of the control device 3, and other various kinds of data.
  • the control-device storage unit 320 has a nonvolatile storage area to store programs and data in a nonvolatile manner.
  • the control-device storage unit 320 may include a volatile storage area configured to serve as a work area that temporarily stores programs to be executed by the control-device processor 310 and data to be processed.
  • the control-device communication unit 31 including communication hardware conforming to a specified communication standard, communicates with each of the first outdoor unit 4A and the second outdoor unit 4B under control of the control-device controller 30.
  • the control-device input unit 32 including input means such as an operation switch, a touch panel, a mouse, and a keyboard provided on the control device 3, detects the user's operations on the input means and outputs detection results to the control-device controller 30.
  • the control-device controller 30 executes processes associated with the operations on the input means, based on the input from the control-device input unit 32.
  • the control-device display unit 33 including LEDs and a display panel, executes turning on/flashing/turning off of the LEDs in specified modes, displaying information on the display panel, and other operations under control of the control-device controller 30.
  • the outdoor unit 4 includes the outdoor-unit controller 400.
  • the outdoor-unit controller 400 includes an outdoor-unit processor 410, which is a processor such as a CPU or an MPU that executes programs, and an outdoor-unit storage unit 420 and controls each unit in the outdoor unit 4.
  • the outdoor-unit controller 400 executes various processes by cooperation of hardware and software so that the outdoor-unit processor 410 reads a control program stored in the outdoor-unit storage unit 420 and execute processes.
  • the outdoor-unit storage unit 420 has a storage area to store programs to be executed by the outdoor-unit processor 410 and data to be processed by the outdoor-unit processor 410.
  • the outdoor-unit storage unit 420 stores the control program that the outdoor-unit processor 410 executes, setting data for performing various kinds of setting of the outdoor unit 4, and other various kinds of data.
  • the outdoor-unit storage unit 420 has a nonvolatile storage area to store programs and data in a nonvolatile manner.
  • the outdoor-unit storage unit 420 may include a volatile storage area configured to serve as a work area that temporarily stores programs to be executed by the outdoor-unit processor 410 and data to be processed.
  • the outdoor-unit controller 400 is connected to the compressor 40, the four-way valve 42, the outdoor blower fan 43, the high-pressure sensor 46, and the low-pressure sensor 47.
  • the outdoor-unit controller 400 controls driving of the compressor 40, the four-way valve 42, the outdoor blower fan 43, and the electromagnetic valve 45, based on detection values of the high-pressure sensor 46 and the low-pressure sensor 47.
  • the outdoor-unit controller 400 controls driving of the compressor 40, the four-way valve 42, the outdoor blower fan 43, and the electromagnetic valve 45, based on control signals received from the control device 3.
  • the outdoor-unit controller 400 transmits detection values outputted by the high-pressure sensor 46 and the low-pressure sensor 47 to the control device 3 through an outdoor-unit communication unit 401.
  • the outdoor unit 4 includes the outdoor-unit communication unit 401.
  • the outdoor-unit communication unit 401 including communication hardware conforming to a specified communication standard, communicates with the control device 3 and the indoor units 5 under control of the outdoor-unit controller 400.
  • the indoor unit 5 includes an indoor-unit controller 500.
  • the indoor-unit controller 500 includes an indoor-unit processor 510, which is a processor such as a CPU or an MPU that executes programs, and an indoor-unit storage unit 520 and controls each unit in the indoor unit 5.
  • the indoor-unit controller 500 executes various processes by cooperation of hardware and software so that the indoor-unit processor 510 reads a control program stored in the indoor-unit storage unit 520 and execute processes.
  • the indoor-unit storage unit 520 has a storage area to store programs to be executed by the indoor-unit processor 510 and data to be processed by the indoor-unit processor 510.
  • the indoor-unit storage unit 520 stores the control program that the indoor-unit processor 510 executes, setting data related to various kinds of setting of the indoor unit 5, and other various kinds of data.
  • the indoor-unit storage unit 520 has a nonvolatile storage area to store programs and data in a nonvolatile manner.
  • the indoor-unit storage unit 520 may include a volatile storage area configured to serve as a work area that temporarily stores programs to be executed by the indoor-unit processor 510 and data to be processed.
  • the indoor-unit controller 500 is connected to the indoor blower fan 50 and the indoor expansion valve 52.
  • the indoor-unit controller 500 controls driving of the indoor blower fan 50 and the indoor expansion valve 52, based on control signals received from the outdoor units 4 and control signals received from a not-illustrated remote controller.
  • An indoor-unit communication unit 501 including communication hardware conforming to a specified communication standard, communicates with the outdoor units 4 under control of the indoor-unit controller 500.
  • the indoor-unit communication unit 501 includes, in addition to the communication hardware of the communication standard to communicate with the outdoor unit 4, communication hardware of a communication standard to communicate with the not-illustrated remote controller and communicates with the remote controller.
  • FIG. 3 is a flowchart showing the operation of the control device 3.
  • the control-device controller 30 determines whether to move the operation mode of the control device 3 to a refrigerant recovery mode (step SA1).
  • the refrigerant recovery mode is an operation mode related to recovery of the refrigerant charged in the air conditioner 2.
  • control-device controller 30 determines that the operation mode of the control device 3 is to be moved to the refrigerant recovery mode (step SA1: YES)
  • the control-device controller 30 moves the operation mode of the control device 3 from a mode other than the refrigerant recovery mode to the refrigerant recovery mode (step SA2).
  • control-device controller 30 executes a first process (step SA3).
  • FIG. 4 is a flowchart showing the operation of the control device 3 in the first process.
  • the control-device controller 30 places the first electromagnetic valve 45A into the closed state (step SB1) .
  • step SB1 the control-device controller 30 transmits a control signal to place the first electromagnetic valve 45A into the closed state to the first outdoor unit 4A through the control-device communication unit 31.
  • the first-outdoor-unit controller 400A receives the control signal through the first outdoor-unit communication unit 401A
  • the first-outdoor-unit controller 400A places the first electromagnetic valve 45A into the closed state.
  • the control-device controller 30 transmits the same or a similar control signal to the first outdoor unit 4A.
  • the control-device controller 30 places the first four-way valve 42A into the state of a cooling cycle (step SB2).
  • step SB2 the control-device controller 30 transmits a control signal to place the first four-way valve 42A into the state of a cooling cycle to the first outdoor unit 4A through the control-device communication unit 31.
  • the first-outdoor-unit controller 400A receives the control signal through the first outdoor-unit communication unit 401A, the first-outdoor-unit controller 400A places the first four-way valve 42A into the state of a cooling cycle.
  • the control-device controller 30 starts driving the first compressor 40A (step SB3).
  • step SB3 the control-device controller 30 transmits a control signal to start driving the first compressor 40A to the first outdoor unit 4A through the control-device communication unit 31.
  • the first-outdoor-unit controller 400A receives the control signal through the first outdoor-unit communication unit 401A, the first-outdoor-unit controller 400A starts driving the first compressor 40A.
  • the control-device controller 30 transmits the same or a similar control signal to the first outdoor unit 4A to start driving the first compressor 40A.
  • the control-device controller 30 drives the first compressor 40A in step SB3 to cause the first outdoor unit 4A to execute pump-down operation.
  • the first outdoor unit 4A executes the pump-down operation to store the refrigerant charged in the air conditioner 2 in the section of the refrigerant pipe 101 between the first compressor 40A and the first electromagnetic valve 45A.
  • the control-device controller 30 determines whether the detection value of the first high-pressure sensor 46A has exceeded a specified threshold (step SB4).
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the viewpoint of not causing effects of the pump-down operation on the discharge side of the first compressor 40A.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is smaller than or equal to the specified threshold (step SB4: NO)
  • the control-device controller 30 executes the process in step SB4 again.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A has exceeded the specified threshold (step SB4: YES)
  • the control-device controller 30 stops driving the first compressor 40A (step SB5).
  • the control-device controller 30 causes the first outdoor unit 4A to stop the pump-down operation.
  • step SB5 the control-device controller 30 transmits a control signal to stop driving the first compressor 40A to the first outdoor unit 4A through the control-device communication unit 31.
  • the first-outdoor-unit controller 400A receives the control signal through the first outdoor-unit communication unit 401A, the first-outdoor-unit controller 400A stops driving the first compressor 40A.
  • the control-device controller 30 transmits the same or a similar control signal to the first outdoor unit 4A to stop driving the first compressor 40A.
  • control-device controller 30 places the second electromagnetic valve 45B into the closed state and also places the indoor expansion valves 52 into the closed state (step SB6).
  • step SB6 the control-device controller 30 transmits a control signal to place the second electromagnetic valve 45B into the closed state to the second outdoor unit 4B through the control-device communication unit 31.
  • the second-outdoor-unit controller 400B receives the control signal through the second outdoor-unit communication unit 401B, the second-outdoor-unit controller 400B places the second electromagnetic valve 45B into the closed state.
  • the control-device controller 30 transmits the same or a similar control signal to the second outdoor unit 4B to place the second electromagnetic valve 45B into the closed state.
  • step SB6 the control-device controller 30 also transmits a control signal to place the indoor expansion valves 52 into the closed state to the outdoor unit 4 through the control-device communication unit 31.
  • the outdoor-unit controller 400 receives the control signal through the outdoor-unit communication unit 401
  • the outdoor-unit controller 400 transmits the control signal to all of the indoor units 5.
  • the indoor-unit controllers 500 receive the control signal through the indoor-unit communication units 501
  • the indoor-unit controllers 500 place the indoor expansion valves 52 into the closed state.
  • control-device controller 30 places the first electromagnetic valve 45A into the open state (step SB7) .
  • step SB7 the control-device controller 30 transmits a control signal to place the first electromagnetic valve 45A into the open state to the first outdoor unit 4A through the control-device communication unit 31.
  • the first-outdoor-unit controller 400A receives the control signal through the first outdoor-unit communication unit 401A
  • the first-outdoor-unit controller 400A places the first electromagnetic valve 45A into the open state.
  • the control-device controller 30 transmits the same or a similar control signal to the first outdoor unit 4A.
  • the refrigerant stored by the pump-down operation of the first outdoor unit 4A is released into the section of the refrigerant pipe 101 from the first compressor 40A to the indoor expansion valves 52 and the second electromagnetic valve 45B.
  • the released refrigerant is recovered by the refrigerant recovery machine 6 connected to the refrigerant pipe 101.
  • control-device controller 30 places the first electromagnetic valve 45A into the open state
  • the control-device controller 30 places the second four-way valve 42B into the state of a cooling cycle (step SB8).
  • step SB8 the control-device controller 30 transmits a control signal to place the second four-way valve 42B into the state of a cooling cycle to the second outdoor unit 4B through the control-device communication unit 31.
  • the second-outdoor-unit controller 400B receives the control signal through the second outdoor-unit communication unit 401B, the second-outdoor-unit controller 400B places the second four-way valve 42B into the state of a cooling cycle.
  • control-device controller 30 starts driving the second compressor 40B (step SB9).
  • step SB9 the control-device controller 30 transmits a control signal to start driving the second compressor 40B to the second outdoor unit 4B through the control-device communication unit 31.
  • the second-outdoor-unit controller 400B receives the control signal through the second outdoor-unit communication unit 401B, the second-outdoor-unit controller 400B starts driving the second compressor 40B.
  • the control-device controller 30 transmits the same or a similar control signal to the second outdoor unit 4B to start driving the second compressor 40B.
  • the control-device controller 30 drives the second compressor 40B in step SB9 to cause the second outdoor unit 4B to execute pump-down operation.
  • the second outdoor unit 4B executes the pump-down operation to store the refrigerant charged in the air conditioner 2 in the section of the refrigerant pipe 101 between the second compressor 40B and the second electromagnetic valve 45B.
  • the control-device controller 30 determines whether the detection value of the second high-pressure sensor 46B has exceeded a specified threshold (step SB10).
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the viewpoint of not causing effects of the pump-down operation on the discharge side of the second compressor 40B.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B is smaller than or equal to the specified threshold (step SB10: NO)
  • the control-device controller 30 executes the process in step SB10 again.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B exceeds the specified threshold (step SB10: YES)
  • the control-device controller 30 stops the second compressor 40B (step SB11). In other words, the second outdoor unit 4B stops executing the pump-down operation.
  • step SB11 the control-device controller 30 transmits a control signal to stop driving the second compressor 40B to the second outdoor unit 4B through the control-device communication unit 31.
  • the second-outdoor-unit controller 400B receives the control signal through the second outdoor-unit communication unit 401B, the second-outdoor-unit controller 400B stops driving the second compressor 40B.
  • the control-device controller 30 transmits the same or a similar control signal to the second outdoor unit 4B to stop driving the second compressor 40B.
  • the control-device controller 30 determines whether the detection value of the first high-pressure sensor 46A is smaller than or equal to a specified threshold (step SB12).
  • This specified threshold may be the same value as the specified threshold that is compared with the detection value in step SB4 or may be a different value.
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the same viewpoint as the specified threshold used in the comparison in step SB4.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is larger than the specified threshold (step SB12: NO)
  • the control-device controller 30 executes the process in step SB12 again.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is smaller than or equal to the specified threshold (step SB12: YES)
  • the control-device controller 30 places the first electromagnetic valve 45A into the closed state (step SB13).
  • control-device controller 30 places the second electromagnetic valve 45B into the open state (step SB14).
  • step SB14 the control-device controller 30 transmits a control signal to place the second electromagnetic valve 45B into the open state to the second outdoor unit 4B through the control-device communication unit 31.
  • the second-outdoor-unit controller 400B receives the control signal through the second outdoor-unit communication unit 401B
  • the second-outdoor-unit controller 400B places the second electromagnetic valve 45B into the open state.
  • the control-device controller 30 transmits the same or a similar control signal to the second outdoor unit 4B.
  • the refrigerant stored by the pump-down operation of the second outdoor unit 4B is released into the section of the refrigerant pipe 101 from the second compressor 40B to the indoor expansion valves 52 and the first electromagnetic valve 45A.
  • the released refrigerant is recovered by the refrigerant recovery machine 6.
  • control-device controller 30 after executing the first process, continues to execute a second process.
  • FIG. 5 is a flowchart showing the operation of the control device 3 in the second process.
  • the control-device controller 30 starts driving the first compressor 40A (step SC1). In other words, the control-device controller 30 causes the first outdoor unit 4A to start executing pump-down operation.
  • step SC1 the second outdoor unit 4B is in a state where the second compressor 40B is stopped, and the second electromagnetic valve 45B is in the open state.
  • step SC2 the second outdoor unit 4B is in a state where the refrigerant stored by the pump-down operation is allowed to be recovered by the refrigerant recovery machine 6.
  • the control-device controller 30 causes the first outdoor unit 4A to execute pump-down operation in a state where the refrigerant is allowed to be recovered from the second outdoor unit 4B.
  • control of causing the first outdoor unit 4A to execute pump-down operation and putting the second outdoor unit 4B into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 corresponds to an example of first control.
  • the control-device controller 30 determines whether the detection value of the first high-pressure sensor 46A has exceeded a specified threshold (step SC2).
  • This specified threshold may be the same value as the specified threshold that is compared with the detection value in step SB4 or may be a different value.
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the same viewpoint as the specified threshold used in the comparison in step SB4.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is smaller than or equal to the specified threshold (step SC2: NO)
  • the control-device controller 30 executes the process in step SC2 again.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A exceeds the specified threshold (step SC2: YES)
  • the control-device controller 30 stops driving the first compressor 40A (step SC3).
  • the control-device controller 30 causes also the first outdoor unit 4A to stop the pump-down operation.
  • the control-device controller 30 determines whether the detection value of the second high-pressure sensor 46B is smaller than or equal to a specified threshold (step SC4).
  • This specified threshold may be the same value as the specified threshold that is compared with the detection value in step SB10 or may be a different value.
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the same viewpoint as the specified threshold used in the comparison in step SB10.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B is larger than the specified threshold (step SC4: NO)
  • the control-device controller 30 executes the process in step SC4 again.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B is smaller than or equal to the specified threshold (step SC4: YES)
  • the control-device controller 30 places the second electromagnetic valve 45B into the closed state (step SC5).
  • control-device controller 30 places the first electromagnetic valve 45A into the open state (step SC6).
  • the refrigerant stored by the pump-down operation of the first outdoor unit 4A is released into the section of the refrigerant pipe 101 from the first compressor 40A to the indoor expansion valves 52 and the second electromagnetic valve 45B.
  • the released refrigerant is recovered by the refrigerant recovery machine 6.
  • the control-device controller 30 starts driving the second compressor 40B (step SC7).
  • the control-device controller 30 causes the second outdoor unit 4B to execute the pump-down operation.
  • step SC7 the first outdoor unit 4A is in a state where the first compressor 40A is stopped, and the first electromagnetic valve 45A is in the open state.
  • the first outdoor unit 4A is in a state where the refrigerant stored by the pump-down operation is allowed to be recovered by the refrigerant recovery machine 6.
  • the control-device controller 30 causes the second outdoor unit 4B to execute pump-down operation in the state where the refrigerant is allowed to be recovered in the first outdoor unit 4A.
  • control of causing the second outdoor unit 4B to execute pump-down operation and putting the first outdoor unit 4A into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 corresponds to an example of second control.
  • the control-device controller 30 determines whether the detection value of the second high-pressure sensor 46B has exceeded a specified threshold (step SC8).
  • This specified threshold may be the same value as the specified threshold that is compared with the detection value in step SB10 or may be a different value.
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the same viewpoint as the specified threshold used in the comparison in step SB10.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B is smaller than or equal to the specified threshold (step SC8: NO)
  • the control-device controller 30 executes the process in step SC8 again.
  • control-device controller 30 determines that the detection value of the second high-pressure sensor 46B exceeds the specified threshold (step SC8: YES)
  • the control-device controller 30 stops driving the second compressor 40B (step SC9).
  • the second outdoor unit 4B stops executing the pump-down operation.
  • the control-device controller 30 determines whether the detection value of the first high-pressure sensor 46A is smaller than or equal to a specified threshold (step SC10).
  • This specified threshold may be the same value as the specified threshold that is compared with the detection value in step SB4 or may be a different value.
  • This specified threshold is appropriately determined by tests, simulations, or the like conducted in advance, based on the same viewpoint as the specified threshold used in the comparison in step SB4.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is larger than the specified threshold (step SC10: NO)
  • the control-device controller 30 executes the process in step SC10 again.
  • control-device controller 30 determines that the detection value of the first high-pressure sensor 46A is smaller than or equal to the specified threshold (step SC10: YES)
  • the control-device controller 30 places the first electromagnetic valve 45A into the closed state (step SC11).
  • control-device controller 30 places the second electromagnetic valve 45B into the open state (step SC12).
  • the control-device controller 30 determines whether the detection values of the first low-pressure sensor 47A or the second low-pressure sensor 47B are smaller than or equal to specified thresholds (step SA5). These specified thresholds are appropriately determined by tests, simulations, or the like conducted in advance, based on the viewpoint of whether there is no refrigerant remaining in the section on the side to which the refrigerant is recovered by the pump-down operation of the outdoor units 4.
  • control-device controller 30 determines that the detection values of the first low-pressure sensor 47A or the second low-pressure sensor 47B are larger than the specified thresholds (step SA5: NO)
  • the control-device controller 30 executes the second process again (step SA4). In other words, the control-device controller 30 repeats execution of the second process until the refrigerant charged in the air conditioner 2 is recovered by the refrigerant recovery machine 6.
  • step SA6 the control-device controller 30 executes a third process.
  • FIG. 6 is a flowchart showing the operation of the control device 3 in the third process.
  • the control-device controller 30 stops driving the first compressor 40A and stops driving the second compressor 40B (step SD1).
  • the control-device controller 30 places the first electromagnetic valve 45A into the open state and places the second electromagnetic valve 45B into the open state (step SD2).
  • the air conditioning system 1 includes an air conditioner 2 including indoor units 5 and a plurality of outdoor units 4 connected to the indoor units 5 and a control-device controller 30 that controls the air conditioner 2.
  • the control-device controller 30 alternately executes first control in which one of the outdoor units 4 is caused to execute pump-down operation and in which another outdoor unit 4 is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 and second control in which the outdoor unit 4 that executes the pump-down operation in the first control is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 and in which the outdoor unit 4 that is put, in the first control, into the state where the refrigerant is allowed to be recovered is caused to execute pump-down operation.
  • This configuration makes it possible to execute pump-down operation with a plurality of outdoor units 4, and also, while one of the outdoor units 4 is executing the pump-down operation, another outdoor unit 4 can be, in parallel, put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6.
  • the air conditioning system 1 even in the case in which a large amount of refrigerant that exceeds a storable amount of the outdoor unit 4 is charged in the air conditioner 2, it is possible to perform refrigerant recovery in a rapid manner by using the pump-down operation of the outdoor units 4.
  • the outdoor unit 4 includes a compressor 40 and a high-pressure sensor 46 that detects the pressure of the refrigerant discharged by the compressor 40.
  • the control-device controller 30 switches between execution of the first control and execution of the second control.
  • This configuration makes it possible to switch the outdoor units 4 that execute pump-down operation before effects of the refrigerant stored by the pump-down operation occur on the discharge side of the compressor 40.
  • the air conditioning system 1 even in the case in which a large amount of refrigerant that exceeds a storable amount of the outdoor unit 4 is charged in the air conditioner 2, it is possible to switch control before the capacity within which the outdoor unit 4 can perform pump-down operation is exceeded and perform refrigerant recovery in a rapid manner by using the pump-down operation of the outdoor units 4.
  • the outdoor unit 4 includes the compressor 40 and the low-pressure sensor 47 that detects the pressure of the refrigerant flowing into the compressor 40.
  • the control-device controller 30 stops execution of the first control and the second control.
  • the number of outdoor units 4 included in an air conditioner 2 and the operation of a control device 3 are different, as compared with the first embodiment.
  • Figure 7 is a diagram showing the configuration of an air conditioning system 1 of the second embodiment.
  • the air conditioner 2 includes four outdoor units 4: a first outdoor unit 4A, a second outdoor unit 4B, a third outdoor unit 4C, and a fourth outdoor unit 4D.
  • a first outdoor unit 4A a second outdoor unit 4B
  • a third outdoor unit 4C a third outdoor unit 4C
  • a fourth outdoor unit 4D a fourth outdoor unit 4D.
  • the second embodiment describes as an example a configuration in which the air conditioner 2 has four outdoor units 4, the number of outdoor units 4 included in the air conditioner 2 only needs to be three or more.
  • the plurality of outdoor units 4 included in the air conditioner 2 each have the same or a similar configuration including their control configurations.
  • identifiers such as "first”, “second”, “third”, and “fourth” are omitted in the names of the constituents, and also, only numerals are used for the symbols of the constituents and the suffixes A, B, C, and D are omitted.
  • first compressor 40A, a second compressor 40B, a third compressor 40C, and a fourth compressor 40D are not discriminated, they are referred to as a "compressor 40".
  • compressor 40 when a first compressor 40A, a second compressor 40B, a third compressor 40C, and a fourth compressor 40D are not discriminated, they are referred to as an "outdoor-unit controller 400".
  • the names of the constituents in the first outdoor unit 4A will have the identifier "first" and their symbols will have the suffix A.
  • the names of the constituents in the second outdoor unit 4B will have the identifier "second" and their symbols will have the suffix B.
  • the names of the constituents in the third outdoor unit 4C will have the identifier "third” and their symbols will have the suffix C.
  • the names of the constituents in the fourth outdoor unit 4D will have the identifier "fourth" and their symbols will have the suffix D.
  • the drawings include symbols that allow the constituents of the first compressor 40A, the second compressor 40B, the third compressor 40C, and the fourth compressor 40D to be discriminated.
  • indoor units 5 of the second embodiment are connected in parallel to the four outdoor units 4 with refrigerant pipes 101 and 102.
  • the outdoor unit 4 of the second embodiment includes a compressor 40, a gas-liquid separator 41, a four-way valve 42, an outdoor heat exchanger 44 having an outdoor blower fan 43, an electromagnetic valve 45, a high-pressure sensor 46, and a low-pressure sensor 47, and these units are connected as in the first embodiment.
  • Figure 8 is a flowchart showing the operation of the control device 3.
  • the same steps as in the flowchart shown in Figure 3 are denoted by the same step numbers, and detailed description thereof is omitted.
  • the control-device controller 30 selects two outdoor units 4 in descending order of the performance of the outdoor units 4 out of the first outdoor unit 4A to the fourth outdoor unit 4D as the outdoor units 4 that will execute pump-down operation (step SE1).
  • step SE1 the control-device controller 30 inquires of all of the outdoor units 4 included in the air conditioner 2 as to how much performance each outdoor unit 4 has.
  • the performance of the outdoor unit 4 is, for example, the horsepower of the compressor 40.
  • the control-device controller 30 selects two outdoor units 4 in descending order of the performance of the outdoor units 4.
  • control-device storage unit 320 stores information indicating the performance of all of the outdoor units 4 included in the air conditioner 2.
  • the control-device controller 30 refers to this information stored in the control-device storage unit 320 and selects two outdoor units 4 in descending order of the performance of the outdoor units 4.
  • the control-device controller 30 executes the same or similar operations as in Figures 3 to 6 . Specifically, the control-device controller 30 alternately repeats first control in which the first outdoor unit 4A is caused to execute pump-down operation and in which the second outdoor unit 4B is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 and second control in which the second outdoor unit 4B is caused to execute pump-down operation and in which the first outdoor unit 4A is put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6.
  • the third outdoor unit 4C and the fourth outdoor unit 4D are not the outdoor units 4 that execute pump-down operation, the third outdoor unit 4C and the fourth outdoor unit 4D are in a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6.
  • the third compressor 40C is not driven, and the third electromagnetic valve 45C is in the open state.
  • the fourth compressor 40D is not driven, and the fourth electromagnetic valve 45D is in the open state. Stopping driving the third compressor 40C and the fourth compressor 40D and placing the third electromagnetic valve 45C and the fourth electromagnetic valve 45D into the open state are done at an appropriate time.
  • control-device controller 30 selects the first outdoor unit 4A and the second outdoor unit 4B, but the control-device controller 30 executes the same or similar operations as in Figures 3 to 6 also in the case in which the control-device controller 30 selects a combination of other outdoor units 4,.
  • one of the outdoor units 4 in the selected combination is designated as the control target instead of the first outdoor unit 4A shown in Figures 3 to 6 , and the control-device controller 30 executes the operations shown in Figures 3 to 6 .
  • another outdoor unit 4 in the selected combination is designated as the control target instead of the second outdoor unit 4B shown in Figures 3 to 6 , and the control-device controller 30 executes the operations shown in Figures 3 to 6 .
  • the outdoor units 4 that are not selected as the outdoor units 4 that execute pump-down operation are put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 during the execution of the first control and the second control.
  • the control-device controller 30 divides the selected two or more outdoor units 4 into two groups. Then, an outdoor unit 4 in one of the groups is designated as the control target instead of the first outdoor unit 4A shown in Figures 3 to 6 , and the control-device controller 30 executes the operations shown in Figures 3 to 6 .
  • an outdoor unit 4 in another group is designated as the control target instead of the second outdoor unit 4B shown in Figures 3 to 6 , and the control-device controller 30 executes the operations shown in Figures 3 to 6 .
  • the outdoor units 4 that are not selected as the outdoor units 4 that execute pump-down operation are put into a state where the refrigerant is allowed to be recovered by the refrigerant recovery machine 6 during the execution of the first control and the second control.
  • the control-device controller 30 selects two or more outdoor units 4 in descending order of the performance of the outdoor units 4 as the outdoor units 4 that execute pump-down operation in either the first control or the second control. Then, the control-device controller 30 executes the first control and the second control with the selected two or more outdoor units 4.
  • the air conditioner 2 includes three or more outdoor units 4, it is possible to cause the outdoor units capable of storing refrigerant in a more rapid manner to execute pump-down operation.
  • the air conditioner 2 includes three or more outdoor units 4, it is possible to perform refrigerant recovery in a rapid manner and efficiently by using the pump-down operation of outdoor units 4.
  • the number of refrigerant recovery machines 6 connected to the refrigerant pipe 101 is one in the foregoing embodiments, the number of refrigerant recovery machines 6 is not limited to one but may be plural.
  • the refrigerant recovery machine 6 may be a machine that can be disconnected from the refrigerant pipe 101 or may be a machine that cannot be disconnected from the refrigerant pipe 101.
  • the position at which the refrigerant recovery machine 6 is connected is not limited to on a pipe connecting the outdoor units 4 with one another but may be at a service port in an outdoor unit 4. The position only has to be downstream of the electromagnetic valves 45 in the direction in which the refrigerant flows in the cooling cycle.
  • the number of indoor units 5 included in the air conditioner 2 is not limited to two but may be one or three or more.
  • control-device controller 30 may control the indoor units 5 not via the outdoor units 4.
  • the air conditioning system 1 is configured such that the control device 3 and the indoor units 5 are capable of communicating directly with each other.
  • the configuration may be such that one of the outdoor-unit controllers 400 controls the air conditioner 2 by performing centralized control over the other outdoor units 4.
  • the outdoor-unit controller 400 that controls the air conditioner 2 corresponds to "a controller" in the present invention.
  • control-device controller 30, the outdoor-unit controller 400, and the indoor-unit controller 500 may be implemented by a plurality of processors or semiconductor chips.
  • each unit does not necessarily have to have an individually corresponding piece of hardware, but it goes without saying that one processor may execute a program to implement the functions of each unit.
  • part of the functions implemented by software in the foregoing embodiments may be implemented by hardware, or part of the functions implemented by hardware may be implemented by software.
  • concrete detailed configurations of other parts in the control device 3, the outdoor unit 4, and the indoor unit 5 may be also modified as appropriate within a range not departing from the spirit of the present invention.
  • step units of the operations shown in Figures 3 to 6 and 8 were divided based on main processes to make it easy to understand the operation of each unit in the control device 3, and hence, the way of dividing process units and the names of the processes do not limit the present invention.
  • the entire process may be divided into more step units according to the details of the processes.
  • the entire process may be divided such that one step unit has more processes.
  • the order of the steps may be exchanged as appropriate within a range that does not cause contradiction to the spirit of the present invention.
  • the air conditioning system according to the present invention can be used for applications involving refrigerant recovery using pump-down operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
EP21814271.9A 2020-05-29 2021-04-26 Système de climatisation Pending EP4160118A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020094409A JP7462186B2 (ja) 2020-05-29 2020-05-29 空気調和システム
PCT/JP2021/016678 WO2021241108A1 (fr) 2020-05-29 2021-04-26 Système de climatisation

Publications (2)

Publication Number Publication Date
EP4160118A1 true EP4160118A1 (fr) 2023-04-05
EP4160118A4 EP4160118A4 (fr) 2023-11-15

Family

ID=78744491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21814271.9A Pending EP4160118A4 (fr) 2020-05-29 2021-04-26 Système de climatisation

Country Status (3)

Country Link
EP (1) EP4160118A4 (fr)
JP (1) JP7462186B2 (fr)
WO (1) WO2021241108A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3109502B2 (ja) 1998-12-28 2000-11-20 ダイキン工業株式会社 冷媒回収方法および冷媒回収装置
JP2004232934A (ja) 2003-01-29 2004-08-19 Fujitsu General Ltd マルチ型空気調和機の制御方法
JP4735557B2 (ja) * 2007-02-02 2011-07-27 ダイキン工業株式会社 冷凍装置
JP5089759B2 (ja) * 2010-12-03 2012-12-05 三菱電機株式会社 冷凍装置
JP5975714B2 (ja) 2011-11-07 2016-08-23 三菱電機株式会社 冷凍空調装置及び冷凍空調システム
WO2016157519A1 (fr) 2015-04-03 2016-10-06 三菱電機株式会社 Dispositif de climatisation
JP2019143877A (ja) 2018-02-21 2019-08-29 株式会社富士通ゼネラル 空気調和システム
JP2020094409A (ja) 2018-12-12 2020-06-18 三菱電機株式会社 遮光システム、遮光金具および遮光システムの施工方法

Also Published As

Publication number Publication date
WO2021241108A1 (fr) 2021-12-02
JP7462186B2 (ja) 2024-04-05
JP2021188826A (ja) 2021-12-13
EP4160118A4 (fr) 2023-11-15

Similar Documents

Publication Publication Date Title
EP3282203A1 (fr) Dispositif de climatisation côté utilisateur et dispositif climatisation le comprenant
CN108307648B (zh) 空调装置
EP1371912A1 (fr) Conditionneur d'air comprenant plusieurs unités et procédé de commande dudit conditionneur
KR101819745B1 (ko) 멀티형 공기조화기 및 그의 제어방법
EP2256435A1 (fr) Climatiseur multi-type et son procédé d'opération de retour d'huile
EP1672292A2 (fr) Dispositif de climatisation à unités multiples et méthode de régulation pour celui-ci
JP6528446B2 (ja) 空気調和装置
EP2682686B1 (fr) Dispositif de réfrigération et de climatisation
EP2476965A1 (fr) Dispositif de conditionnement d'air
EP2933582A1 (fr) Dispositif de climatiseur
JP5996087B2 (ja) 空気調和装置
EP3929506A1 (fr) Dispositif à cycle frigorifique
CN1900678B (zh) 空调检查方法
EP4160118A1 (fr) Système de climatisation
JP4214198B2 (ja) 空気調和機
EP4113033A1 (fr) Appareil de climatisation
EP3978817A1 (fr) Système de climatisation
KR101116211B1 (ko) 멀티 에어컨 시스템 및 멀티 에어컨 시스템의 배관연결탐색방법
EP3988869A1 (fr) Dispositif de réfrigération
JPH08189690A (ja) 多室形空気調和システムの暖房除湿運転制御装置
JP7209186B2 (ja) 空気調和システム、及び、空気調和システムの制御方法
WO2022163058A1 (fr) Dispositif de climatisation
EP4130912A1 (fr) Système de diagnostic
KR20180117935A (ko) 멀티형 공기조화기
KR100705232B1 (ko) 공기조화기의 운전장치 및 방법

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230102

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20231012

RIC1 Information provided on ipc code assigned before grant

Ipc: F25B 49/02 20060101ALI20231006BHEP

Ipc: F25B 13/00 20060101ALI20231006BHEP

Ipc: F24F 11/32 20180101ALI20231006BHEP

Ipc: F25B 1/00 20060101ALI20231006BHEP

Ipc: F25B 45/00 20060101AFI20231006BHEP