WO2020079835A1 - Climatiseur - Google Patents

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Publication number
WO2020079835A1
WO2020079835A1 PCT/JP2018/039035 JP2018039035W WO2020079835A1 WO 2020079835 A1 WO2020079835 A1 WO 2020079835A1 JP 2018039035 W JP2018039035 W JP 2018039035W WO 2020079835 A1 WO2020079835 A1 WO 2020079835A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
flow path
heat exchanger
bypass flow
compressor
Prior art date
Application number
PCT/JP2018/039035
Other languages
English (en)
Japanese (ja)
Inventor
幹 佐藤
拓未 西山
伊東　大輔
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2020551698A priority Critical patent/JP7034325B2/ja
Priority to PCT/JP2018/039035 priority patent/WO2020079835A1/fr
Priority to EP18937404.4A priority patent/EP3869114B1/fr
Publication of WO2020079835A1 publication Critical patent/WO2020079835A1/fr

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    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2507—Flow-diverting valves
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Definitions

  • Patent Document 1 JP2009-145032A
  • this refrigeration cycle device can quickly defrost by causing the refrigerant discharged from the compressor to flow to the outdoor heat exchanger through the bypass circuit.
  • the defrosting time is shortened by causing the refrigerant to flow through the outdoor heat exchanger through the bypass flow path connecting the compressor discharge side and the outdoor heat exchanger inlet side.
  • a refrigerant having a low discharge temperature for example, R290, which is one of HC (hydrocarbon) refrigerants
  • the temperature difference between the refrigerant and the outdoor heat exchanger becomes small and per unit time.
  • the time required for defrosting cannot be shortened because the amount of heat exchange of is reduced.
  • the refrigerant circulates in the order of the compressor, the first heat exchanger, the first expansion valve, and the second heat exchanger, and the second circuit of the second heat exchanger.
  • the first bypass flow passage that connects the first expansion valve side pipe and the discharge side pipe of the compressor, the second bypass flow passage that connects the suction side pipe of the compressor and the discharge side pipe of the compressor, and the compressor are A first flow path selection device configured to selectively pass the discharged refrigerant through at least one of the first heat exchanger, the first bypass flow path, and the second bypass flow path.
  • the first flow path selection device selects at least the first heat exchanger.
  • the first flow path selection device selects at least the first bypass flow path after selecting at least the second bypass flow path.
  • FIG. 4 is a ph diagram showing the state of the refrigerant during the defrosting operation in the first embodiment. It is the figure which overlapped and showed the temperature distribution of the refrigerant
  • FIG. 7 is a diagram showing a difference in time from a frosting determination to the start of a defrosting operation in each of the comparative example and the first embodiment.
  • FIG. 1 is a schematic configuration diagram showing a configuration of an air conditioner 100 according to the first embodiment.
  • the air conditioner 100 further includes a compressor 1, a four-way valve 4, an extension pipe 9a, a first heat exchanger 5, an extension pipe 9b, a first expansion valve 6a, and a second heat exchanger 7.
  • a compressor 1 a four-way valve 4
  • an extension pipe 9a a first heat exchanger 5
  • an extension pipe 9b a first expansion valve 6a
  • a second heat exchanger 7 a second heat exchanger 7.
  • the first heat exchanger 5 is an indoor heat exchanger arranged indoors
  • the second heat exchanger 7 is an outdoor heat exchanger arranged outdoors.
  • the first bypass flow path B1 connects the point P2 of the first expansion valve 6a side pipe of the second heat exchanger 7 and the discharge side pipe P1 of the compressor 1 to each other.
  • a fan (not shown) for blowing air is provided on the air outlet side or the air inlet side of each of the first heat exchanger 5 and the second heat exchanger 7.
  • a line flow fan, a propeller fan, a turbo fan, a sirocco fan, or the like can be used.
  • a plurality of fans may be provided for one heat exchanger.
  • the configuration shown in FIG. 1 is the minimum component capable of cooling and heating operation, and devices such as a gas-liquid separator, a receiver and an accumulator may be added to the main circuit 30.
  • the type of the refrigerant enclosed in the air conditioner is not particularly limited.
  • an HFC (hydrofluorocarbon) refrigerant, an HFO (hydrofluoroolefin) refrigerant, an HC (hydrocarbon) refrigerant, or a non-azeotropic mixed refrigerant may be enclosed.
  • the first flow path selection device 20 selects at least the first bypass flow path B1 after selecting at least the second bypass flow path B2. As a result, the refrigerant whose temperature has risen through the second bypass flow passage B2 then flows into the second heat exchanger 7 from the first bypass flow passage B1 and defrosting is performed.
  • FIG. 2 is a flowchart for explaining the operation of each element during the defrosting operation in the first embodiment.
  • FIG. 3 is a diagram showing states of elements in each processing of the flowchart of FIG.
  • control device 50 causes the solenoid valve 3a to be opened and the solenoid valve 3b to be closed in step S100 so that the passage switching valve 8 selects the second bypass passage B2. Control the valve.
  • step S101 If it is determined in step S101 that no frost has formed (NO in S101), the process is temporarily returned to the main routine, and the processes of S100 and S101 are repeated again. When it is determined in step S101 that frost has formed (YES in S101), the process proceeds to step S102.
  • FIG. 5 is a diagram showing the flow of the refrigerant in the first defrosting stage (S102, S103) according to the first embodiment.
  • step S102 the refrigerant discharged from the compressor 1 passes through the second bypass passage B2, is decompressed by the second expansion valve 6b, and is again sucked into the compressor 1. Since the solenoid valve 3a is in the closed state, a part of the refrigerant staying in the first heat exchanger 5 and the second heat exchanger 7 is sucked out through the path indicated by the broken line arrow and is indicated by the solid line arrow. The temperature is raised in a loop.
  • the controller 50 fully opens the expansion valve 6a in step S102. This is because when the defrosting operation is switched, the refrigerant remaining in the main circuit is swiftly passed through the loop indicated by the solid arrow including the second bypass flow passage B2. Further, the control device 50 sets the opening degree of the second expansion valve 6b to the same opening degree as that of the first expansion valve 6a during the heating operation before starting the defrosting operation. This is to prevent a state where the pressure difference before and after the second expansion valve 6b becomes small and the discharge pressure and discharge temperature of the refrigerant do not rise when the opening degree of the second expansion valve 6b is too large. Moreover, when the opening degree of the second expansion valve 6b is too small, the amount of the refrigerant flowing into the suction side of the compressor 1 is prevented from becoming excessively small.
  • control device 50 obtains information for determining whether the discharge temperature of the refrigerant has reached the target value, and the discharge temperature of the refrigerant is It is determined whether or not the target value has been reached. Specifically, the control device 50 acquires the detection result of the temperature sensor 2a, and based on the detection result, the temperature of the refrigerant discharged from the compressor 1 is set to a second threshold value T2 (for example, 100). °C) has been reached.
  • T2 for example, 100.
  • step S104 when the temperature of the refrigerant discharged from the compressor 1 does not reach the predetermined second threshold value (for example, 100 ° C.) even after a certain fixed time (for example, 60 seconds) has elapsed from the start of step S102, The process may proceed to step S104.
  • the predetermined second threshold value for example, 100 ° C.
  • a certain fixed time for example, 60 seconds
  • step S104 the control device 50 switches the selection of the passage switching valve 8 from the second bypass passage B2 to the first bypass passage B1.
  • FIG. 6 is a diagram showing the flow of the refrigerant in the defrosting second stage (S104, S105) according to the first embodiment.
  • step S104 the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the first bypass passage B1 and is introduced into the second heat exchanger 7. In this way, the second heat exchanger 7 is defrosted. Further, the refrigerant flowing out from the second heat exchanger 7 is decompressed by the second expansion valve 6b and is again sucked into the compressor 1.
  • the operating frequency of the compressor 1 in step S104 is preferably higher than that of normal heating operation. This is different from the general defrosting operation in which the refrigerant is circulated backward in the cooling direction, and since it is the defrosting operation in the overheated gas region, the flow rate of the refrigerant is small and the amount of heat used for defrosting is small. This is to prevent
  • the control device 50 determines in step S105 whether or not to finish the defrosting. Specifically, the controller 50 has a surface temperature of the second heat exchanger 7 that is equal to or higher than a predetermined third threshold value (for example, 0 ° C.) based on the detection signal output from the temperature sensor 2b. Or not. When the surface temperature of the second heat exchanger 7 is lower than the third threshold value (NO in S105), the control device 50 determines to continue the defrosting of the second heat exchanger 7, and proceeds to step S104. Return processing. On the other hand, when the surface temperature of the second heat exchanger 7 is equal to or higher than the third threshold value (YES in S105), the control device 50 determines to end the defrosting of the second heat exchanger 7. Then, the process proceeds to step S106.
  • a predetermined third threshold value for example, 0 ° C.
  • step S106 the control device 50 sets the solenoid valve 3a to the open state and the solenoid valve 3b to the closed state. At this time, the refrigerant flows as shown in FIG. 4, whereby the steady heating operation is performed.
  • the first flow path selecting device 20 selects the second bypass flow path B2 and deselects the first bypass flow path B1 and the first heat exchanger 5 (see FIG. 5, S102, S103), and then the first bypass flow passage B1 is selected and the second bypass flow passage B2 and the first heat exchanger 5 are deselected (FIG. 6, S104, S105).
  • the control device 50 controls the solenoid valve 3a, the solenoid valve 3b, and the flow path.
  • the switching valve 8 is operated to flow the entire amount of the refrigerant into the second bypass flow passage B2.
  • the control device 50 operates the flow path switching valve 8 to move the second heat exchanger through the first bypass flow path B1.
  • the second refrigerant heat exchanger 7 is defrosted by flowing the entire amount of the refrigerant into the second heat exchanger 7.
  • the refrigerant inlet side of the outdoor heat exchanger during heating tends to frost, but in the present embodiment, the second heat is passed through the first bypass passage B1.
  • a high-pressure / high-temperature refrigerant gas can flow to the inlet side of the heat exchanger 7 during heating, and the temperature difference between the refrigerant and the second heat exchanger 7 increases on the inlet side of the second heat exchanger 7 during heating, resulting in a unit time The amount of heat exchange of is increased. Therefore, defrosting can be performed in a short time.
  • the defrosting operation can be performed without circulating the refrigerant through the first heat exchanger 5 in the room, it is possible to reduce a decrease in room temperature during the defrosting operation.
  • the solenoid valve 3a when the detection result of the temperature sensor 2b becomes equal to or lower than the preset first threshold value and the second outdoor heat exchanger 7 is determined to be frosted and the defrosting operation is started, the solenoid valve 3a is operated. Is closed to prevent the refrigerant from flowing into the main circuit 30, and at the same time, the solenoid valve 3b is opened to allow the entire amount of the refrigerant to flow into the second bypass passage B2, and then the passage switching valve 8 is switched to open the first bypass passage B1. It is selected and the entire amount of the refrigerant is flown to the second heat exchanger 7. Therefore, it is not necessary to switch the four-way valve 4 during the defrosting operation.
  • FIG. 10 is a diagram showing a difference in time from the frosting determination to the start of the defrosting operation in each of the comparative example and the first embodiment.
  • FIG. 11 is a diagram showing a difference in time from the completion of defrosting to the return to heating in each of the comparative example and the first embodiment.
  • FIG. 12 is a schematic configuration diagram showing the configuration of the air conditioner 200 according to the second embodiment.
  • the air conditioner 200 includes a main circuit 30, a first bypass flow passage B1, a second bypass flow passage B2, and a first flow passage selection device 20A.
  • the air conditioner 200 further includes a compressor 1, a four-way valve 4, an extension pipe 9a, a first heat exchanger 5, an extension pipe 9b, a first expansion valve 6a, and a second heat exchanger 7.
  • a compressor 1 a four-way valve 4
  • an extension pipe 9a a first heat exchanger 5
  • an extension pipe 9b a first expansion valve 6a
  • a second heat exchanger 7 a second heat exchanger 7.
  • the first heat exchanger 5 is an indoor heat exchanger arranged indoors
  • the second heat exchanger 7 is an outdoor heat exchanger arranged outdoors.
  • the refrigerant in the main circuit 30 is the compressor 1, the four-way valve 4, the extension pipe 9a, the first heat exchanger 5, the extension pipe 9b, the first expansion valve 6a, the second heat exchanger 7, the four-way valve. It circulates in the order of 4 and returns to the compressor 1.
  • the second bypass flow passage B2 connects the suction side pipe (point P4) of the compressor 1 and the discharge side pipe (point P1) of the compressor 1.
  • the first flow path selection device 20A is configured to selectively pass the refrigerant discharged from the compressor 1 through at least one of the first heat exchanger 5, the first bypass flow path B1, and the second bypass flow path B2. To be done.
  • the first flow path selection device 20A is configured to selectively pass the refrigerant discharged from the compressor 1 through the pipe C0 or the branch pipe B0.
  • the first flow path selection device 20A is also configured to be able to distribute the refrigerant to the first bypass flow path B1 and the second bypass flow path B2 at an arbitrary ratio.
  • the first flow passage selection device 20A selects the second bypass flow passage B2 and deselects the first bypass flow passage B1 and the first heat exchanger 5 (Fig. 16) Next, the first bypass flow passage B1 and the second bypass flow passage B2 are selected and the first heat exchanger 5 is deselected (FIG. 18).
  • the air conditioner 200 according to the second embodiment shown in FIG. 12 further includes a second expansion valve 6c, a third bypass flow path B3, a third expansion valve 6d, and a second flow path selection device.
  • the second expansion valve 6c is arranged in the middle of the second bypass flow passage B2.
  • the third bypass flow passage B3 is a flow passage that branches from the pipe C1 through which the refrigerant that has passed through the second heat exchanger 7 flows to reach the suction side of the compressor 1.
  • the third expansion valve 6d is arranged in the middle of the third bypass flow passage B3.
  • the channel switching valve 8b that selectively connects the pipe C2 or the third bypass channel B3 can be used.
  • the pipe C2 is a pipe that connects the pipe C1 to the suction side of the compressor 1 without passing through the third bypass flow passage B3.
  • the air conditioner 200 of the second embodiment has the same basic configuration as the air conditioner 100 of the first embodiment, but differs in the following first to fourth points.
  • the main circuit 30 has the flow path switching valve 8b, and the expansion valve 6b is removed.
  • the flow path switching valve 8 for selecting the first bypass flow path B1 and the second bypass flow path B2 is replaced by the flow rate adjusting valve 10.
  • the second expansion valve 6c is provided in the second bypass flow passage B2.
  • the third bypass flow passage B3 having the third expansion valve 6d is provided.
  • the flow rate adjusting valve 10 is configured to be able to freely adjust the amount of the refrigerant distributed in the first bypass flow passage B1 and the second bypass flow passage B2.
  • the flow rate adjusting valve 10 may have any configuration, but for example, an electronic expansion valve may be provided in each of the two-way branch passages through which the refrigerant flows.
  • the air conditioner 200 further includes a control device 50 and temperature sensors 2a and 2b.
  • the temperature sensor 2a detects the temperature of the refrigerant discharged from the compressor 1.
  • the temperature sensor 2b detects the surface temperature of the second heat exchanger 7 at a position close to the point P2d side which is the refrigerant outlet of the second heat exchanger 7 during the heating operation.
  • the control device 50 is based on the temperature detected by the temperature sensors 2a and 2b and a command from the user, and the compressor 1, the four-way valve 4, the first expansion valve 6a, the flow path selection device 20, the second expansion valve 6b and not shown. Control the fan. Since the basic configuration of control device 50 is similar to that of the first embodiment, description thereof will not be repeated.
  • the type of the refrigerant enclosed in the air conditioner is not particularly limited.
  • HFC refrigerant, HFO refrigerant, HC refrigerant, or non-azeotropic mixed refrigerant may be enclosed.
  • FIG. 13 is a flowchart for explaining the operation of each element during the defrosting operation in the second embodiment.
  • FIG. 14 is a diagram showing states of elements in each process of the flowchart of FIG.
  • step S200 the control device 50 controls the solenoid valve 3a so that the solenoid valve 3a is in the open state and the solenoid valve 3b is in the closed state, and the passage switching valve 8b controls these valves so as to select the pipe C2. To do.
  • step S201 the control device 50 acquires information for determining whether the second heat exchanger 7 is frosted, and then the second heat exchanger. It is determined whether or not No. 7 is frosted. Specifically, the control device 50 acquires the detection result of the temperature sensor 2b, and based on the detection result, the surface temperature of the second heat exchanger 7 has a predetermined first threshold value (for example, ⁇ 3). C)) or less. When the surface temperature of the second heat exchanger 7 is equal to or lower than the first threshold value, the control device 50 determines that the second heat exchanger 7 is frosted.
  • a predetermined first threshold value for example, ⁇ 3. C
  • step S201 If it is determined in step S201 that frost has not formed (NO in S201), the process is temporarily returned to the main routine, and the processes of S200 and S201 are repeated. When it is determined in step S201 that frost has formed (YES in S201), the process proceeds to step S202.
  • step S202 the control device 50 closes the solenoid valve 3a and opens the solenoid valve 3b, and operates the flow rate adjusting valve 10 so that the entire amount of the refrigerant flows into the second bypass flow passage B2. Further, the control device 50 switches the selection of the flow path switching valve 8b from the pipe C2 to the third bypass flow path, and fully opens the expansion valve 6d.
  • FIG. 16 is a diagram showing the flow of the refrigerant in the first stage (S202, S203) during defrosting of the second embodiment.
  • the refrigerant discharged from the compressor 1 passes through the second bypass passage B2, is decompressed by the second expansion valve 6c, and is sucked into the compressor 1 again.
  • step S202 the first expansion valve 6a and the expansion valve 6d are fully opened. This is because when the defrosting operation is switched, the refrigerant remaining in the main circuit 30 is swiftly flowed through the loop indicated by the solid arrow including the second bypass flow passage B2. Further, the opening degree of the second expansion valve 6c is set to the same opening degree as that of the first expansion valve 6a during the heating operation before starting the defrosting operation. This is to prevent a state where the pressure difference before and after the second expansion valve 6c becomes small and the discharge pressure and discharge temperature of the refrigerant do not rise when the opening degree of the second expansion valve 6c is too large. Moreover, when the opening degree of the second expansion valve 6c is too small, the amount of the refrigerant flowing in on the suction side of the compressor 1 is prevented from becoming excessively small.
  • control device 50 obtains information for determining whether or not the discharge temperature of the refrigerant has reached the target value, and the discharge temperature of the refrigerant is It is determined whether or not the target value has been reached. Specifically, the control device 50 acquires the detection result of the temperature sensor 2a, and based on the detection result, the temperature of the refrigerant discharged from the compressor 1 is set to a second threshold value T2 (for example, 100). °C) has been reached.
  • T2 for example, 100.
  • step S203 when the rise in the discharge temperature of the refrigerant in a certain time interval (for example, 5 seconds) does not reach the predetermined third threshold value (for example, 10 ° C.), the operating frequency of the compressor 1 is changed. It may be controlled to increase.
  • FIG. 17 is a diagram showing the flow of the refrigerant in the second stage of defrosting (S204, S205) according to the second embodiment.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the first bypass passage B1 and is introduced into the second heat exchanger 7.
  • the high-temperature high-pressure refrigerant defrosts the second heat exchanger 7.
  • the refrigerant flowing out from the second heat exchanger 7 is decompressed by the third expansion valve 6d and is again sucked into the compressor 1.
  • step S206 the control device 50 operates the flow rate adjusting valve 10 so that the refrigerant is distributed to the first bypass passage B1 and the second bypass passage B2.
  • control device 50 determines in step S207 whether or not to finish the defrosting. Specifically, the control device 50 determines whether the surface temperature of the second heat exchanger 7 is equal to or higher than a predetermined third threshold value (for example, 0 ° C.) based on the detection signal output from the temperature sensor 2b. Determine whether or not. The control device 50 determines to finish the defrosting of the second heat exchanger 7 when the surface temperature of the second heat exchanger 7 is equal to or higher than the third threshold value.
  • a predetermined third threshold value for example, 0 ° C.
  • the control device 50 sets the solenoid valve 3a to the open state, the solenoid valve 3b to the closed state, and selects the flow path switching valve 8b in the third step S208.
  • the bypass flow path B3 is switched to the pipe C2.
  • the time from the start of defrosting to the heating return is ⁇ T3 in comparison with the conventional case. It can be shortened to ⁇ T4, and a quick heating effect can be obtained when the heating operation is returned.
  • the air conditioner 300 includes a main circuit 30, a first bypass flow passage B1, a second bypass flow passage B2, and a first flow passage selection device 20B.
  • the second bypass flow passage B2 connects the suction side pipe of the compressor 1 and the discharge side pipe of the compressor 1 via the first flow passage selecting device 20B.
  • the air conditioner 100 further includes a second expansion valve 6e.
  • the second expansion valve 6e is provided in the middle of the second bypass flow passage B2 in FIG.
  • the air conditioner 300 is configured to connect the first bypass flow passage B1 and the first expansion valve 6a to either the first heat exchange portion 7a or the second heat exchange portion 7b, and the third flow passage selection device 20C. Is further provided.
  • the second flow path selection device 20C includes solenoid valves 3c, 3d, 3e, 3f.
  • the solenoid valve 3c opens and closes the flow path connecting the first expansion valve 6a and the first heat exchange section 7a.
  • the solenoid valve 3d opens and closes a flow path that connects the first expansion valve 6a and the second heat exchange unit 7b.
  • the solenoid valve 3e opens and closes the flow path connecting the first bypass flow path B1 and the first heat exchange section 7a.
  • the solenoid valve 3f opens and closes the flow path that connects the first bypass flow path B1 and the second heat exchange unit 7b.
  • the first flow path selection device 20B is configured to selectively flow the refrigerant discharged from the compressor 1 into at least one of the first heat exchanger 5, the first bypass flow path B1, and the second bypass flow path B2. To be done.
  • the first flow path selection device 20B selectively causes the refrigerant discharged from the compressor 1 to flow through either the first heat exchanger 5 or the branch pipe B0, and also flows through the branch pipe B0. Is distributed to the first bypass flow passage B1 and the second bypass flow passage B2.
  • the first flow path selection device 20B distributes the refrigerant to the main circuit 30 and the second bypass flow path B2 during the defrosting operation (FIGS. 27 and 31), Then, while flowing the refrigerant through the main circuit 30 to either the first heat exchange section 7a or the second heat exchange section 7b, either the first heat exchange section 7a or the second heat exchange section 7b through the first bypass flow passage B1.
  • the refrigerant is passed to the other side (FIGS. 28 and 32).
  • the third flow passage selecting device 20C connects the first bypass flow passage B1 to either one of the first heat exchange portion 7a and the second heat exchange portion 7b and sets the first expansion valve 6a to the first expansion valve 6a during the defrosting operation. It is connected to either the other of the 1st heat exchange part 7a and the 2nd heat exchange part 7b (FIG. 28, FIG. 32).
  • the air conditioner 300 of the third embodiment has the same basic configuration as that of the first embodiment, but has a flow rate adjusting valve 10b in the main circuit 30, the expansion valve 6b is removed, the solenoid valve 3c, the solenoid.
  • the valve 3d is provided, the second heat exchanger 7 is provided with the divided first heat exchange portion 7a and second heat exchange portion 7b, and the first heat exchange portion 7a and the second heat exchange portion 7b are provided, respectively.
  • a fan for blowing air is provided on each of the air outlet side and the air inlet side of the second heat exchanger 7 and the first heat exchanger 5 (not shown).
  • Each fan may be a line flow fan, a propeller fan, a turbo fan, a sirocco fan, or the like.
  • a configuration may be used in which a plurality of fans are used for one heat exchanger.
  • the first heat exchange section 7a and the second heat exchange section 7b may be arranged side by side in the horizontal direction or may be arranged side by side in the vertical direction.
  • the above-mentioned configuration is the minimum component capable of cooling and heating operation, and a gas-liquid separator, a receiver, an accumulator and the like may be further added to the main circuit 30.
  • the temperature sensor 2c included in the first heat exchange unit 7a and the temperature sensor 2d included in the second heat exchange unit 7b are provided at a position on the outlet side of the refrigerant during heating operation (point P10 side). Has been.
  • the type of refrigerant enclosed in the air conditioner is not limited.
  • the refrigerant HFC refrigerant, HFO refrigerant, HC refrigerant, or non-azeotropic mixed refrigerant may be enclosed.
  • FIG. 24 is a flowchart for explaining the operation of each element during the defrosting operation of the first heat exchange unit 7a in the third embodiment.
  • FIG. 25 is a diagram showing states of elements in each processing of the flowchart of FIG. FIG. 25 shows the open / closed state of the solenoid valves 3c, 3d, 3b, 3e, 3f in each process of FIG. It is shown.
  • the processes of the frost formation determination (S301), the constant discharge temperature arrival determination (S303), and the defrosting end determination (S305) of the flowchart of FIG. 24 are the same as those of S101, S103, and S105 of the first embodiment, respectively.
  • the processing (S300, S302, S304, S306) involving the operation of is different from that of the first embodiment.
  • control described in FIGS. 24 and 25 is a control for defrosting the first heat exchange unit 7a from the heating operation, and in the case of defrosting the second heat exchange unit 7b, the control illustrated in FIGS. This will be described with reference to FIG.
  • step S300 the control device 50 causes the solenoid valve 3c to be open, the solenoid valve 3d to be open, the solenoid valve 3b to be closed, the solenoid valve 3e to be closed, and the solenoid valve 3f to be closed. Therefore, the flow path switching valve 8 selects the first bypass flow path B1, and the flow rate adjustment valve 10b controls these valves so that the entire amount of the refrigerant flows into the main circuit 30.
  • FIG. 26 is a diagram showing a refrigerant flow during heating (S300, S301, S306) according to the third embodiment.
  • the refrigerant is discharged from the compressor 1, and the flow rate adjusting valve 10b, the four-way valve 4, the first heat exchanger 5, the first expansion valve 6a, the second heat exchanger 7, the four-way valve 4 are provided. And then returns to the compressor 1.
  • the refrigerant is divided into two by the flow path selection device 20C, and is parallel to the path of the first heat exchange section 7a and the expansion valve 6f and the path of the second heat exchange section 7b and the expansion valve 6g. And flow at the point P10.
  • step S301 the control device 50 acquires information for determining whether the first heat exchange unit 7a is frosted, and then the first heat exchange unit. It is determined whether 7a is frosted. Specifically, the control device 50 acquires the detection result of the temperature sensor 2c, and based on the detection result, the surface temperature of the first heat exchanging portion 7a has a predetermined first threshold value (for example, ⁇ 3 ° C.) or less is determined. The controller 50 determines that the first heat exchange unit 7a is frosted when the surface temperature of the first heat exchange unit 7a is equal to or lower than the first threshold value. When it is determined that frost is formed, the control device 50 advances the process to step S302. If it is determined that frost has not formed, the processes of steps S302 to S306 are not executed, and the processes of steps S300 and S301 are repeated.
  • a predetermined first threshold value for example, ⁇ 3 ° C.
  • step S302 in the control device 50, the electromagnetic valve 3c is closed, the electromagnetic valve 3b is opened, the flow path switching valve 8 selects the second bypass flow path B2, and the flow rate adjustment valve 10 supplies the refrigerant to the main circuit 30.
  • Each valve is controlled so as to be distributed to the pipe C0 and the second bypass flow passage B2.
  • the solenoid valves 3e and 3f are maintained in the state of step S300 and are both closed. Further, the state of step S300 is maintained, and the solenoid valve 3d is controlled to be in the open state.
  • the opening degree of the expansion valve 6e is set to the same opening degree as that of the expansion valve 6a in step S302. This is because the refrigerant flowing through the pipe C1 of the main circuit 30 and the refrigerant flowing through the second bypass passage B2 are merged at the same pressure at the point P11.
  • step S303 the control device 50 acquires information for determining whether the discharge temperature of the refrigerant has reached the target value, and whether the discharge temperature of the refrigerant has reached the target value. To determine. Specifically, the control device 50 acquires the detection result of the temperature sensor 2a, and based on the detection result, the temperature of the refrigerant discharged from the compressor 1 is set to a second threshold value T2 (for example, 100). °C) is reached. When the discharge temperature of the refrigerant has reached the second threshold value T2 in step S303, the control device 50 advances the process to step S304.
  • a second threshold value T2 for example, 100.
  • step S302 and S303 the density of the refrigerant sucked into the compressor 1 may decrease with time. In that case, since the mass flow rate of the refrigerant sucked into the compressor 1 decreases, the discharge temperature of the refrigerant may not easily rise with time. Therefore, in step S303, when the increase in the discharge temperature of the refrigerant at a constant time interval (for example, 5 second intervals) does not reach the predetermined third threshold value (for example, 10 ° C.), the operating frequency of the compressor 1 May be controlled.
  • a constant time interval for example, 5 second intervals
  • the predetermined third threshold value for example, 10 ° C.
  • FIG. 28 is a diagram showing the flow of the refrigerant in the second stage (S304, S305) during the defrosting operation of the first heat exchange section 7a.
  • a part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows through the first bypass passage B1 and is introduced into the first heat exchange section 7a. In this way, the first heat exchange section 7a is defrosted.
  • the refrigerant flowing out of the first heat exchange section 7a is decompressed by the expansion valve 6f.
  • step S306 the control device 50 causes the solenoid valve 3c to be in the open state, the solenoid valve 3d to be in the open state, the solenoid valve 3b to be in the closed state, and the solenoid valve 3e to be in the closed state. Control each valve so that At this time, the flow path switching valve 8 remains unchanged. As a result, the refrigerant flows as shown in FIG. 26, and the steady heating operation is performed.
  • FIG. 29 is a flow chart for explaining the operation of each element during the defrosting operation of the second heat exchange section 7b in the third embodiment.
  • FIG. 30 is a diagram showing states of elements in each processing of the flowchart of FIG. In FIG. 30, the open / closed states of the solenoid valves 3c, 3d, 3b, the solenoid valve 3e, and the solenoid valve 3f in each process of FIG. The distribution state is shown.
  • step S300 the control device 50 causes the solenoid valve 3c to be open, the solenoid valve 3d to be open, the solenoid valve 3b to be closed, the solenoid valve 3e to be closed, and the solenoid valve 3f to be closed. Therefore, the flow path switching valve 8 selects the first bypass flow path B1, and the flow rate adjustment valve 10b controls these valves so that the entire amount of the refrigerant flows into the main circuit 30. As a result, the refrigerant flows as shown in FIG.
  • step S301A the control device 50 acquires information for determining whether or not the second heat exchange unit 7b is frosted, and determines whether or not the second heat exchange unit 7b is frosted. To judge. Specifically, the control device 50 acquires the detection result of the temperature sensor 2d, and based on the detection result, the surface temperature of the second heat exchanging portion 7b has a predetermined first threshold value (for example, ⁇ 3 ° C.) or less is determined. The control device 50 determines that the second heat exchange unit 7b is frosted when the surface temperature of the second heat exchange unit 7b is equal to or lower than the first threshold value. In this case, the control device 50 advances the process to step S302A.
  • a predetermined first threshold value for example, ⁇ 3 ° C.
  • step S302A in the control device 50, the electromagnetic valve 3d is closed, the electromagnetic valve 3b is opened, the flow path switching valve 8 selects the second bypass flow path B2, and the flow rate adjustment valve 10 supplies the refrigerant to the main circuit 30.
  • Each valve is controlled so as to be distributed to the pipe C0 and the second bypass flow passage B2.
  • the solenoid valves 3e and 3f are maintained in the state of step S300 and are both closed. Further, the state of step S300 is maintained and the solenoid valve 3c is controlled to be in the open state.
  • FIG. 31 is a diagram showing a refrigerant flow in the first stage (S302A, S303A) during the defrosting operation of the second heat exchange section 7b.
  • a part of the refrigerant discharged from the compressor 1 flows to the main circuit 30 and the first heat exchange section 7a to continue the heating operation, and another part of the refrigerant flows to the second bypass flow.
  • the pressure is reduced by the expansion valve 6e and is again sucked into the compressor 1.
  • the opening degree of the expansion valve 6e is set to the same opening degree as that of the expansion valve 6a in step S302A. This is because the refrigerant flowing through the pipe C1 of the main circuit 30 and the refrigerant flowing through the second bypass passage B2 are merged at the same pressure at the point P11.
  • step S303A the control device 50 acquires information for determining whether or not the discharge temperature of the refrigerant has reached the target value, and determines whether the discharge temperature of the refrigerant has reached the target value. To determine. Specifically, the control device 50 acquires the detection result of the temperature sensor 2a, and based on the detection result, the temperature of the refrigerant discharged from the compressor 1 is a second threshold value set in advance (for example, 100 ° C.). ) Is reached. When the discharge temperature of the refrigerant has reached the second threshold value in step S303A, the control device 50 advances the process to step S304A.
  • step S302A and S303A the density of the refrigerant sucked into the compressor 1 may decrease with time. In that case, since the mass flow rate of the refrigerant sucked into the compressor 1 decreases, the discharge temperature of the refrigerant may not easily rise with time. For this reason, in step S303A, when the refrigerant discharge temperature rise at a constant time interval (for example, 5 second intervals) is less than a predetermined third threshold value (for example, 10 ° C.), the operating frequency of the compressor 1 is increased. You may control.
  • a constant time interval for example, 5 second intervals
  • a predetermined third threshold value for example, 10 ° C.
  • the temperature of the refrigerant discharged from the compressor 1 reaches a predetermined second threshold value (for example, 100 ° C.) even after a certain fixed time (for example, 60 seconds) has elapsed from the time when the process of step S302A was started. If not, the process may proceed to step S304A.
  • a predetermined second threshold value for example, 100 ° C.
  • a certain fixed time for example, 60 seconds
  • step S304A the control device 50 controls each valve so that the solenoid valve 3f is opened and the passage switching valve 8 selects the first bypass passage B1.
  • the solenoid valves 3b, 3c, 3d, 3e and the flow rate adjusting valve 10b the state of step S302A is maintained.
  • the control device 50 determines in step S305A whether or not to finish the defrosting. Specifically, the control device 50 determines whether the surface temperature of the second heat exchange section 7b is equal to or higher than a predetermined third threshold value (for example, 0 ° C.) based on the detection signal output from the temperature sensor 2d. Determine whether or not. The control device 50 determines that the defrosting is ended when the surface temperature of the second heat exchange section 7b is equal to or higher than the third threshold value. When determining to end the defrosting, the control device 50 advances the process to step S306.
  • a predetermined third threshold value for example, 0 ° C.
  • step S306 the control device 50 causes the solenoid valve 3c to be in the open state, the solenoid valve 3d to be in the open state, the solenoid valve 3b to be in the closed state, and the solenoid valve 3e to be in the closed state. Control each valve so that As a result, the refrigerant flows as shown in FIG. 26, and the steady heating operation is performed.
  • the heat exchange section on the windward side is more likely to frost than the heat exchange section on the leeward side, and the heat exchange section on the leeward side does not need to be defrosted in many cases.
  • the heat exchanging part that preferentially defrosts in this way will be described as the first heat exchanging part 7a.
  • FIG. 33 is a flowchart for explaining an example of a process of defrosting the first heat exchanging unit 7a prior to the second heat exchanging unit 7b in the third embodiment. Note that the numbers of the respective steps are given the same numbers as the steps of FIGS. 24 and 29, and detailed description will not be repeated.
  • control device 50 causes the refrigerant to flow in parallel to first heat exchange unit 7a and second heat exchange unit 7b, and performs normal heating operation. Then, the control device 50 determines whether or not frost is formed on the first heat exchange unit 7a in step S301.
  • step S301 When it is determined in step S301 that there is frost formation (YES in S301), in steps S302 and S303, the control device 50 continues the heating using the second heat exchange section 7b with a part of the refrigerant while remaining.
  • the refrigerant temperature increasing process is performed to cause the refrigerant to flow through the second bypass flow path B2 and circulate to increase the temperature.
  • step S301 when it is determined that there is no frost formation, and when the processes of steps S304 and S305 are executed and the defrosting of the first heat exchange unit 7a is completed, subsequently in step S301A, the control device 50 causes the second heat The presence or absence of frost on the exchange section 7b is determined.
  • step S302A and S303A the control device 50 continues heating while using the first heat exchange section 7a with some of the refrigerant, while remaining.
  • the refrigerant temperature increasing process is performed to cause the refrigerant to flow through the second bypass flow path B2 and circulate to increase the temperature.
  • control device 50 continues the heating using the first heat exchange unit 7a with a part of the refrigerant, and the remaining refrigerant with the second heat exchange unit via the first bypass flow passage B1. 7b to defrost the second heat exchange section 7b.
  • step S306 If it is determined in step S301A that there is no frost formation, or if the processing of steps S304A and S305A has been executed and the defrosting of the second heat exchange section 7b has been completed, then the processing of step S306 proceeds.
  • the control device 50 changes the setting of each valve so that the refrigerant flows in parallel to the first heat exchange section 7a and the second heat exchange section 7b so that the normal heating operation is performed, and the processing is performed. Return to the main routine.
  • the refrigerant is distributed to the main circuit 30 and the second bypass flow passage B2, and then the refrigerant is distributed to the main circuit 30 and the first bypass flow passage B1 to flow the refrigerant.
  • the heating operation can be continued even during the defrosting operation.
  • the heating operation can be continued even during the defrosting operation, it is possible to reduce the decrease in room temperature during the defrosting operation and improve comfort.
  • the air conditioner of the present disclosure includes a first bypass flow path B1 that connects the discharge side of the compressor 1 and the heating-side inlet side of the outdoor second heat exchanger 7, the discharge side of the compressor 1, and the suction side of the compressor 1. And a second bypass flow path B2 connecting the two.
  • the control device 50 operates the flow path selection devices 20, 20A, 20B to bypass the refrigerant to the second bypass. Defrosting is performed by causing the refrigerant to flow through the flow path B2 and then through the first bypass flow path B1 to the outdoor second heat exchanger 7.
  • the discharge temperature of the refrigerant in the compressor 1 can be made higher than usual.
  • the temperature of the refrigerant is higher than that during the normal heating operation, and the outdoor first. 2 can be flowed to the heat exchanger 7.
  • the defrosting operation is performed in a state where the temperature of the refrigerant is higher than normal, the temperature difference between the refrigerant and the frosted heat exchanger becomes large in the entire second heat exchanger 7 outside the unit, and Since the amount of heat exchange is increased, defrosting can be performed in a short time.
  • frost is likely to form on the refrigerant inlet side of the outdoor heat exchanger during heating.
  • a high-pressure / high-temperature refrigerant gas can flow to the heating refrigerant inlet side of the second heat exchanger 7 through the first bypass passage B1. Therefore, the temperature difference between the refrigerant and the frosted heat exchanger on the refrigerant inlet side of the second heat exchanger 7 during heating increases, and the amount of heat exchange per unit time increases, so defrosting is performed in a short time. be able to.
  • defrosting is performed in a gas region in a more overheated state as compared with general defrosting by switching the cooling operation. For this reason, the degree of superheat (SH) of the refrigerant sucked into the compressor 1 becomes large, and liquid back to the compressor 1 does not easily occur, so that the reliability of the compressor 1 can be improved.
  • SH superheat
  • the refrigerant does not pass through the extension pipes 9a and 9b, the first heat exchanger 5 in the room, and the like during the defrosting operation, as compared with the general defrosting operation by switching the cooling operation. Therefore, heat dissipation loss can be reduced.
  • the defrosting operation can be performed without the refrigerant passing through the first heat exchanger 5 in the room, as compared with the general defrosting operation by switching the cooling operation. No heat absorption occurs in the heat exchanger 5, and it is possible to reduce the decrease in room temperature during the defrosting operation.
  • the flow path selection devices 20, 20A, 20B when starting the defrosting operation, the flow path selection devices 20, 20A, 20B are operated to prevent the refrigerant from flowing into the main circuit 30, and to transfer the refrigerant to the second bypass flow path B2. Then, the refrigerant is allowed to flow to the outdoor second heat exchanger 7 through the first bypass flow path B1. This eliminates the need to switch the four-way valve during defrosting operation, and it is not necessary to stop the compressor in order to create the pressure state required to switch the four-way valve. You can
  • the four-way valve is switched when the heating operation is returned by operating the flow path selection devices 20, 20A, 20B and flowing the entire amount of the refrigerant into the main circuit 30. Absent. For this reason, it is not necessary to stop the compressor in order to create the pressure state necessary for switching the four-way valve.Therefore, it is necessary to shorten the time to return to heating operation as compared to the defrosting operation by switching cooling operation in general. You can

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Chemical & Material Sciences (AREA)
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  • Air Conditioning Control Device (AREA)

Abstract

Climatiseur (100) comprenant : un circuit principal (30) ; un premier canal de dérivation (B1) par lequel communiquent un tuyau de second échangeur de chaleur (7) sur le côté d'un premier détendeur (6a) et un tuyau côté évacuation d'un compresseur (1) ; un second canal de dérivation (B2) par lequel communiquent un tuyau côté admission du compresseur (1) et le tuyau côté évacuation du compresseur (1) ; et un premier dispositif de sélection de canal (20) qui est conçu pour permettre à un fluide frigorigène évacué par le compresseur (1) de s'écouler dans au moins l'un parmi le premier échangeur de chaleur (5), le premier canal de dérivation (B1) et le second canal de dérivation (B2), de manière sélective. Pendant les opérations de chauffage, le premier dispositif de sélection de canal (20) sélectionne au moins le premier échangeur de chaleur (5). Pendant les opérations de dégivrage, le premier dispositif de sélection de canal (20) sélectionne au moins le second canal de dérivation (B2) et sélectionne ensuite au moins le premier canal de dérivation (B1). Grâce à cette configuration, on peut créer un climatiseur qui peut effectuer un dégivrage en peu de temps.
PCT/JP2018/039035 2018-10-19 2018-10-19 Climatiseur WO2020079835A1 (fr)

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PCT/JP2018/039035 WO2020079835A1 (fr) 2018-10-19 2018-10-19 Climatiseur
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CN113465125A (zh) * 2021-06-17 2021-10-01 青岛海尔空调电子有限公司 空调器的除霜控制方法、计算机可读存储介质及控制装置

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CN111503819A (zh) * 2020-04-29 2020-08-07 广东美的制冷设备有限公司 空调系统的控制方法和空调系统
CN111503819B (zh) * 2020-04-29 2022-05-03 广东美的制冷设备有限公司 空调系统的控制方法和空调系统
CN113465125A (zh) * 2021-06-17 2021-10-01 青岛海尔空调电子有限公司 空调器的除霜控制方法、计算机可读存储介质及控制装置
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EP3869114A1 (fr) 2021-08-25
JP7034325B2 (ja) 2022-03-11
EP3869114A4 (fr) 2021-10-27
EP3869114B1 (fr) 2024-03-20

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