EP2930450B1 - Dispositif de conditionnement de l'air - Google Patents

Dispositif de conditionnement de l'air Download PDF

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Publication number
EP2930450B1
EP2930450B1 EP12889228.8A EP12889228A EP2930450B1 EP 2930450 B1 EP2930450 B1 EP 2930450B1 EP 12889228 A EP12889228 A EP 12889228A EP 2930450 B1 EP2930450 B1 EP 2930450B1
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EP
European Patent Office
Prior art keywords
source side
heat source
side heat
refrigerant
heat exchanger
Prior art date
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Application number
EP12889228.8A
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German (de)
English (en)
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EP2930450A4 (fr
EP2930450A1 (fr
Inventor
Takeshi Hatomura
Koji Yamashita
Shinichi Wakamoto
Naofumi Takenaka
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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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
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F28D1/0435—Combination of units extending one behind the other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • 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
    • F25B2313/0251—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units being defrosted alternately
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • 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
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
    • F28D2021/0063—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
    • F28D2021/0064—Vaporizers, e.g. evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/02—Arrangements of fins common to different heat exchange sections, the fins being in contact with different heat exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling

Definitions

  • FIG. 1 the configuration of the air-conditioning apparatus 100 will be specifically described.
  • the air-conditioning apparatus 100 circulates a refrigerant therein so that air-conditioning is performed by using a refrigeration cycle.
  • the air-conditioning apparatus 100 is configured to select a mode from a cooling-only operation mode in which all the operating indoor units 2 perform cooling, a heating-only operation mode in which all the operating indoor units 2 perform heating, and a defrosting operation mode in which the indoor units 2 defrost heat exchange units in the outdoor unit 1 while continuing a heating operation.
  • the compressor 10, the refrigerant channel switching device 11 such as a four-way valve, the heat source side heat exchanger 12a, the heat source side heat exchanger 12b, and the accumulator 13 are connected together by the refrigerant pipes 3.
  • the heat source side heat exchanger 12a and the heat source side heat exchanger 12b are connected in parallel to each other by the refrigerant pipes 3.
  • Second opening/closing devices 31a and 31b are provided to portions of the refrigerant pipes 3 connected to the heat source side heat exchanger 12a and the heat source side heat exchanger 12b, the portions of the refrigerant pipes 3 connecting to a load side expansion device 22.
  • the heat source side heat exchanger 12a and the heat source side heat exchanger 12b are disposed adjacent to each other such that the fins are oriented in the same direction.
  • the heat source side heat exchanger 12a is located above the heat source side heat exchanger 12b.
  • the heat source side heat exchanger 12a and the heat source side heat exchanger 12b are disposed side by side along the direction of stages, that is, the stage direction, of the heat exchanger tubes.
  • the heat source side heat exchanger 12a and the heat source side heat exchanger 12b are disposed one above the other such that the fins of the exchangers 12a and 12b are oriented in an identical direction.
  • the first opening/closing device 30a is a shut-off valve for causing a high-temperature refrigerant from the hot gas bypass pipe 5 to flow into the heat source side heat exchanger 12a when the heat source side heat exchanger 12a operates as a condenser in the defrosting operation mode.
  • the first opening/closing device 30b is a shut-off valve for causing a high-temperature refrigerant from the hot gas bypass pipe 5 to flow into the heat source side heat exchanger 12b when the heat source side heat exchanger 12b operates as a condenser in the defrosting operation mode.
  • the first opening/closing devices 30a and 30b are, for example, two way valves, solenoid valves, and electronic expansion valves, which can open and close refrigerant channels.
  • the second opening/closing device 31a is a shut-off valve for shutting off a refrigerant channel in order to prevent a low-temperature two-phase refrigerant flowing out of the indoor unit 2 into the outdoor unit 1 through a refrigerant main pipe 4 from flowing into the heat source side heat exchanger 12a when the heat source side heat exchanger 12a operates as a condenser in the defrosting operation mode.
  • the first temperature sensor 43 is provided to the pipe between the compressor 10 and the refrigerant channel switching device 11.
  • the first temperature sensor 43 measures the temperature of a refrigerant discharged from the compressor 10.
  • the third temperature sensor 48b is provided to the pipe between the heat source side heat exchanger 12b and the refrigerant channel switching device 11.
  • the third temperature sensor 48b measures the temperature of a refrigerant that has flowed from the heat source side heat exchanger 12b operating as an evaporator.
  • the indoor unit 2 includes a load side heat exchanger 21 and a load side expansion device 22.
  • the load side expansion device 22 has functions of a pressure reducing valve and an expansion valve, and reduces the pressure of a refrigerant and expands the refrigerant.
  • the load side expansion device 22 is located upstream of the load side heat exchanger 21 in a refrigerant flow in the cooling-only operation mode.
  • the load side expansion device 22 is a valve whose opening degree is variable by control.
  • the load side expansion device 22 is, for example, an electronic expansion valve.
  • the indoor unit 2 includes, as temperature detection means, a fourth temperature sensor 46, a fifth temperature sensor 47, and a sixth temperature sensor 44.
  • the fourth temperature sensor 46, the fifth temperature sensor 47, and the sixth temperature sensor 44 are, for example, thermistors.
  • the fifth temperature sensor 47 is provided to the pipe between the load side heat exchanger 21 and the refrigerant channel switching device 11 of the outdoor unit 1.
  • the fifth temperature sensor 47 detects the temperature of a refrigerant flowing in the load side heat exchanger 21 or a refrigerant that has flowed from the load side heat exchanger 21.
  • Fig. 3 is a refrigerant circuit diagram showing a refrigerant flow in a cooling-only operation mode of the air-conditioning apparatus 100 of Embodiment 1.
  • the refrigerant channel switching device 11 is switched to a state indicated by the solid lines in Fig. 3 .
  • the first opening/closing device 30a and the first opening/closing device 30b are switched to closed states, and shut off the refrigerant.
  • the second opening/closing device 31a and the second opening/closing device 31b are switched to open states, and allow the refrigerant to pass therethrough.
  • the refrigerant channel switching device 11 is switched to a state indicated by the solid lines in Fig. 4 .
  • the first opening/closing device 30a and the first opening/closing device 30b are switched to closed states, and shut off the refrigerant.
  • the second opening/closing device 31a and the second opening/closing device 31b are switched to an open state, and allow the refrigerant to pass therethrough.
  • a defrosting operation mode is performed when detection results of the third temperature sensors 48a and 48b at the outlets of the heat source side heat exchanger 12a and the heat source side heat exchanger 12b are less than or equal to a predetermined value. Specifically, when the heating-only operation is performed so that the detection results of the third temperature sensors 48a and 48b decrease to a predetermined value or less (e.g., about -10 degrees C or less), the control device 50 determines that a predetermined amount of frost is accumulated on the fins of the heat source side heat exchangers 12a and 12b, and the defrosting operation is performed.
  • a predetermined value or less e.g., about -10 degrees C or less
  • Fig. 5 is a refrigerant circuit diagram showing a refrigerant flow in a case where the heat source side heat exchanger 12b is defrosted in the defrosting operation mode of the air-conditioning apparatus 100 of Embodiment 1.
  • the flow direction of a refrigerant is indicated by solid arrow lines.
  • the second opening/closing device 31b is switched to a closed state and shuts off the refrigerant.
  • the second opening/closing device 31a is maintained in an open state and allows the refrigerant to pass therethrough.
  • the low-temperature low-pressure refrigerant is compressed and becomes a high-temperature high-pressure gas refrigerant, and the resulting refrigerant is discharged.
  • the high-temperature high-pressure gas refrigerant that has flowed from the outdoor unit 1 flows into the indoor unit 2 through the refrigerant main pipe 4, transfers heat to the indoor air in the load side heat exchanger 21, and becomes a liquid refrigerant while heating the indoor air.
  • the refrigerant channel switching device 11 In the defrosting operation mode, the refrigerant channel switching device 11 is maintained in a state indicated by the solid lines in Fig. 6 .
  • the control device 50 finishes defrosting of the heat source side heat exchanger 12a.
  • reference numeral 61 denotes a fin of the heat source side heat exchanger 12a.
  • Reference numeral 64 denotes a heat transmission pipe of the heat source side heat exchanger 12a.
  • Reference numeral 62 denotes a fin of the heat source side heat exchanger 12b.
  • Reference numeral 65 denotes a heat transmission pipe of the heat source side heat exchanger 12b.
  • the end face of each of the fin 61 and the fin 62 is subjected to a roughening process and forms a heat leakage reducing mechanism.
  • the heat leakage amount Q1 from the condenser to the evaporator in a case where the fins are not separated and are shared is about 3.60 kW from Equation (1).
  • the overall heat transfer coefficient is a half of the product of a heat transfer area (a contact area) and the overall heat transfer coefficient in a case where the fins are shared.
  • the reduction of the time required for completion of defrosting enables part of a refrigerant discharged from the compressor 10 for defrosting to be quickly used for heating, as compared to a case where heat leakage occurs from the condenser to the evaporator by thermal conduction of the fins.
  • a decrease in heating capacity can be reduced.
  • a temperature decrease in the room can be reduced, thereby comfort of the indoor environments can be obtained.
  • the total number of stages of the heat source side heat exchanger 12a and the heat source side heat exchanger 12b is 60, the product of the number of stages and the heat transfer area ratio is about 58. That is, in order to reduce the decreasing rate of the COP within 1% or less, about 58 or more stages of the heat exchangers are needed.
  • heat leakage between the heat source side heat exchanger 12a and the heat source side heat exchanger 12b can be reduced in the defrosting operation mode.
  • generation of remaining frost and root ice can be reduced in the interface 63 between the adjacent heat source side heat exchangers 12.
  • the defrosting time is reduced and a decrease in heating capacity is reduced, thereby obtaining comfort in the indoor environments.
  • Fig. 15 is a circuit diagram schematically illustrating an example circuit configuration of an air-conditioning apparatus 200 according to Embodiment 2 of the present invention.
  • FIG. 15 a configuration of the air-conditioning apparatus 200 of Embodiment 2 will be described based on the difference from the air-conditioning apparatus 100 of Embodiment 1.
  • a second opening/closing device 31a that shuts off a refrigerant of a heat source side heat exchanger 12a is disposed between the heat source side heat exchanger 12a and a refrigerant channel switching device 11.
  • a second opening/closing device 31b that shuts off a refrigerant of a heat source side heat exchanger 12b is disposed between the heat source side heat exchanger 12b and the refrigerant channel switching device 11.
  • the hot gas bypass pipe 5 connected to the heat source side heat exchanger 12a is provided with a first opening/closing device 30a.
  • the hot gas bypass pipe 5 connected to the heat source side heat exchanger 12b is provided with a first opening/closing device 30b.
  • the third opening/closing devices 32a and 32b are expansion devices whose opening degrees (the areas of the opening ports) can be changed in order to adjust the internal pressure of the heat source side heat exchanger 12 serving as a condenser.
  • the first opening/closing device 30a, the first opening/closing device 30b, the second opening/closing device 31a, the second opening/closing device 31b, the third opening/closing device 32a, and the third opening/closing device 32b constitute "connection switching devices" of the invention.
  • the lower heat source side heat exchanger 12b in the casing 51 is defrosted, and then the upper heat source side heat exchanger 12a in the casing 51 is defrosted.
  • Conditions for starting the defrosting operation mode are similar to those in the air-conditioning apparatus 100 of Embodiment 1.
  • the second opening/closing device 31b is switched to a closed state, and shuts off the refrigerant.
  • the first opening/closing device 30a is kept in a closed state, and shuts off the refrigerant.
  • the third opening/closing device 32b is set in a fully open state, and allows the refrigerant to pass therethrough.
  • the opening degree of the third opening/closing device 32a is controlled by the control device 50 such that the saturation pressure of a two-phase refrigerant calculated from the detection result of the sixth temperature sensor 48b is a predetermined value (e.g., about 0.8 MPa in the case of an R410A refrigerant) or more.
  • a predetermined value e.g., about 0.8 MPa in the case of an R410A refrigerant
  • the low-temperature low-pressure refrigerant is compressed and becomes a high-temperature high-pressure gas refrigerant, and the resulting refrigerant is discharged.
  • Part of the high-temperature high-pressure gas refrigerant discharged from the compressor 10 is subjected to a pressure reduction in the hot gas bypass pipe 5 and the first opening/closing device 30b such that the temperature of the gas refrigerant is 0 degrees C or more in terms of the saturation temperature.
  • the resulting refrigerant becomes an intermediate-pressure high-temperature gas refrigerant, and flows into the heat source side heat exchanger 12b.
  • the intermediate-pressure high-temperature gas refrigerant that has flowed into the heat source side heat exchanger 12b becomes an intermediate-pressure low-quality two-phase refrigerant or an intermediate-pressure refrigerant while melting frost on the heat source side heat exchanger 12b, and passes through the third opening/closing device 32b.
  • the control device 50 controls the opening degree of the third opening/closing device 32a such that the saturation pressure of the two-phase refrigerant calculated from the detection result of the sixth temperature sensor 48b is a predetermined value (e.g., about 0.8 MPa in the case of an R410A refrigerant) or more. That is, the control device 50 controls the opening degree of the third opening/closing device 32a such that the saturation pressure of the two-phase refrigerant calculated from the detection result of the sixth temperature sensor 48b is 0 degrees C or more in terms of the saturation temperature.
  • a predetermined value e.g., about 0.8 MPa in the case of an R410A refrigerant
  • the saturation temperature of the refrigerant in the heat source side heat exchanger 12 serving as a condenser is set at an intermediate pressure (e.g., about 0.8 MPa or more in the case of an R410A refrigerant), which is higher than the frost temperature, that is, higher than 0 degrees C.
  • an intermediate pressure e.g., about 0.8 MPa or more in the case of an R410A refrigerant
  • the two-phase range (latent heat) of the refrigerant can be used, and substantially the same degrees of defrosting capacity can be obtained with an amount of refrigerant circulation smaller than that in the configuration of the air-conditioning apparatus 100 of Embodiment 1.
  • the saturation temperature T1 of a two-phase refrigerant flowing in a condenser that performs defrosting is 5 degrees C
  • the temperature T2 of a refrigerant flowing in an evaporator that performs heating operation is -25 degrees C.
  • the inter-fin distance 8 between an end of the heat transmission pipe of the evaporator and an end of the heat transmission pipe of the condenser in the interface 63 is 12.5 mm, and in a state where the heat exchangers are not separated, the fin width is 17 mm, the fin thickness is 0.1 mm, and the number of fins is 3700.
  • the air-conditioning apparatus 200 of Embodiment 2 employs the configuration illustrated in Fig. 7 as a configuration of the heat leakage reducing mechanism, but the present invention is not limited to this configuration.
  • the configuration of the heat leakage reducing mechanism may be any one of the configurations illustrated in Figs. 8 to 13 described in Embodiment 1. In such cases, similar advantages as those obtained in the configuration illustrated in Fig. 7 can be obtained.
  • the third opening/closing device 32b (or the third opening/closing device 32a) may be changed to a expansion device whose opening degree (the area of the opening port) is variable.
  • the unchanged third opening/closing device 32a (or the third opening/closing device 32b) is always open, and the third opening/closing device 32b (or the third opening/closing device 32a) changed to the expansion device whose opening degree (the area of the opening port) is variable is used.
  • the internal pressure of the heat source side heat exchanger 12 serving as a condenser is adjusted. In this state, an operation similar to that of the air-conditioning apparatus 200 illustrated in Fig. 15 can be performed, and similar advantages can be obtained.
  • Such a configuration can reduce the number of expansion devices whose opening degrees (the areas of the opening ports), such as electronic expansion valves including stepping motors, generally having structures more complicated and expensive than solenoid valves, and thus, the outdoor unit 1 can be fabricated at low cost.
  • the third opening/closing device 32b (or the third opening/closing device 32a) may be changed to a expansion device whose opening degree (the area of the opening port) is variable.
  • the third opening/closing device 32 is provided, and the internal pressure of the heat source side heat exchanger 12 serving as a condenser is adjusted in the defrosting operation.
  • an operation similar to that of the air-conditioning apparatus 200 illustrated in Fig. 15 can be performed, and similar advantages can be obtained.
  • the configuration illustrated in Fig. 17 can simplify the circuit configuration, and thus, the outdoor unit 1 can be fabricated at low cost.
  • a fourth opening/closing device 33a and a fourth opening/closing device 33b for shutting off the refrigerant in the heat source side heat exchanger 12a or the heat source side heat exchanger 12b are disposed in refrigerant pipes 3 connecting the heat source side heat exchanger 12a and the heat source side heat exchanger 12b to the third opening/closing device 32b (or the third opening/closing device 32a).
  • a fifth opening/closing device 34a and a fifth opening/closing device 34b for switching a refrigerant channel of the refrigerant bypass pipe 6 is provided in the refrigerant bypass pipe 6 between the heat source side heat exchanger 12 and the fourth opening/closing device 33 whose one ends correspond to each other.
  • the open/closed states of the first opening/closing devices 30a and 30b, the fourth opening/closing devices 33a and 33b, and the fifth opening/closing devices 34a and 34b are reversed, and the flow of the refrigerant in the heat source side heat exchanger 12a is replaced by the flow of the refrigerant in the heat source side heat exchanger 12b.
  • the expansion devices may be electronic expansion valves driven by stepping motors, or a plurality of small solenoid valves may be arranged in parallel so that the area of the opening port can be changed by switching the solenoid valves.
  • the fifth opening/closing device 34 of Embodiment 2 is a solenoid valve as an example.
  • valves whose opening degrees are variable such as electronic expansion valves, may be used as shut-off valves, as well as the solenoid valves.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Air Conditioning Control Device (AREA)

Claims (9)

  1. Appareil de climatisation comprenant :
    un circuit principal dans lequel un compresseur (10), un échangeur de chaleur côté charge (21), un dispositif de détente côté charge (22), et une pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) reliés en parallèle sont reliés séquentiellement par des tuyaux (3, 4) et dans lequel un fluide frigorigène circule,
    caractérisé en ce que l'appareil de climatisation comprend :
    un tuyau de dérivation (5) configuré pour amener une partie d'un fluide frigorigène déchargé du compresseur (10) à se séparer et à s'écouler dans au moins l'un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer,
    un dispositif de commutation de liaison (30a, 30b, 31a, 31b, 32a, 32b) configuré pour commuter ledit un de la pluralité d'échangeurs de chaleur côté source de chaleur à dégivrer en commutant un canal du tuyau de dérivation (5) entre un état ouvert et un état fermé et en commutant un canal des tuyaux (3, 4) du circuit principal reliés à la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) entre un état ouvert et un état fermé, un capteur de température (48a, 48b) prévu pour chacun de la pluralité d'échangeurs de chaleur côté source de chaleur pour mesurer la température du fluide frigorigène qui s'est écoulé hors dudit échangeur de chaleur côté source de chaleur, et
    un dispositif de commande (50) configuré pour commander le dispositif de commutation de liaison, dans lequel
    les échangeurs de chaleur côté source de chaleur (12a, 12b) comprennent chacun
    une pluralité d'ailettes (61, 62) espacées les unes des autres de sorte que l'air passe entre la pluralité d'ailettes (61, 62), et
    une pluralité de tubes d'échangeur de chaleur (64, 65) disposés dans la pluralité d'ailettes (61, 62) et permettant l'écoulement du fluide frigorigène dans les tubes d'échangeur de chaleur (64, 65),
    la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b)
    sont disposés adjacents les uns aux autres de sorte que la pluralité d'ailettes (61, 62) sont orientées dans une direction identique, et
    comprend un mécanisme de réduction de fuites de chaleur qui est intercalé entre les ailettes adjacentes de la pluralité d'ailettes (61, 62) et qui réduit une quantité de fuite de chaleur entre les échangeurs de chaleur adjacents de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b), et
    le dispositif de commutation de liaison (30a, 30b, 31a, 31b, 32a, 32b) comprend
    une pluralité de premiers dispositifs d'ouverture-fermeture (30a, 30b) qui ouvrent ou ferment chacun un canal du tuyau de dérivation (5) à la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b),
    une pluralité de deuxièmes dispositifs d'ouverture-fermeture (31a, 31b) qui ouvrent ou ferment chacun un canal d'au moins l'un des tuyaux (3) reliés à la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) et reliant à un côté d'aspiration du compresseur (10),
    une pluralité de troisièmes dispositifs d'ouverture-fermeture (32a, 32b) prévus chacun pour les tuyaux (4) reliés à la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) et reliant au dispositif de détente côté charge (22) et ayant un degré d'ouverture variable, et
    le tuyau de dérivation (5) et la pluralité de premiers dispositifs d'ouverture-fermeture sont configurés pour relâcher une pression du fluide frigorigène s'écoulant du tuyau de dérivation (5) dans ledit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer de sorte que la pression corresponde à une température de saturation de 0 degré ou plus, et
    le dispositif de commande (50) est configuré pour
    ouvrir au moins l'un de la pluralité de premiers dispositifs d'ouverture-fermeture (30a, 30b) correspondant audit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer, fermer au moins l'un de la pluralité de deuxièmes dispositifs d'ouverture-fermeture (31a, 31b) correspondant audit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer, et
    ouvrir au moins l'un de la pluralité de troisièmes dispositifs d'ouverture-fermeture (32a, 32b) correspondant audit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer, et
    fermer au moins l'un des premiers dispositifs d'ouverture-fermeture (30a, 30b) correspondant audit un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à ne pas dégivrer, ouvrir au moins l'un des deuxièmes dispositifs d'ouverture-fermeture (31a, 31b) correspondant audit un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à ne pas dégivrer, et ajuster un degré d'ouverture d'au moins l'un de la pluralité de troisièmes dispositifs d'ouverture-fermeture (32a, 32b) correspondant audit un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à ne pas dégivrer de sorte qu'une pression de saturation du fluide frigorigène calculée à partir d'un résultat de détection d'une température obtenue par le capteur de température (48a, 48b) prévu pour ledit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer corresponde à une température de saturation de 0 degré ou plus.
  2. Appareil de climatisation selon la revendication 1, dans lequel
    au moins l'un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à l'exception dudit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer sert en tant qu'évaporateur et effectue une opération de chauffage dans une opération de dégivrage dans laquelle une partie du fluide frigorigène déchargé du compresseur (10) s'écoule dans ledit au moins un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer, et
    au moins l'un de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) à dégivrer est remplacé séquentiellement par un autre de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b).
  3. Appareil de climatisation selon la revendication 1 ou 2, dans lequel
    la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) sont adjacents les uns aux autres et agencés les uns au-dessus des autres, et
    une face d'extrémité la plus basse de chacune des ailettes (61, 62) d'un échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) est séparée d'une face d'extrémité la plus haute de chacune des ailettes (61, 62) d'un échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b).
  4. Appareil de climatisation selon la revendication 3, dans lequel
    le mécanisme de réduction de fuites de chaleur est constitué par un jeu (54) entre la face d'extrémité la plus basse de chacune des ailettes (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) et la face d'extrémité la plus haute de chacune des ailettes (61, 62) de l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b),
    et une longueur (Ls) du jeu (54) est inférieure ou égale à une valeur calculée en multipliant le nombre d'étages (Dd) de la pluralité de tubes d'échangeur de chaleur (64, 65) dans un état dans lequel la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) ne sont pas séparés, une distance (Ld) entre les parties centrales des tubes adjacents de la pluralité de tubes d'échangeur de chaleur (64, 65) dans la direction des étages dans un état dans lequel la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) ne sont pas séparés, et 0,033.
  5. Appareil de climatisation selon la revendication 3, dans lequel
    la face d'extrémité la plus basse de chacune des ailettes (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) est en contact avec la face d'extrémité la plus haute de chacune des ailettes (61, 62) de l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b), et
    le mécanisme de réduction de fuites de chaleur est constitué par une surface grossière située dans au moins l'une de la face d'extrémité la plus basse de chacune des ailettes (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) ou de la face d'extrémité la plus haute de chacune des ailettes (61, 62) de l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b).
  6. Appareil de climatisation selon la revendication 3, dans lequel
    la face d'extrémité la plus basse de chacune des ailettes (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) est en contact avec la face d'extrémité la plus haute de chacune des ailettes (61, 62) de l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b), et
    le mécanisme de réduction de fuites de chaleur est constitué par une encoche (66) située dans une partie d'au moins l'une de la face d'extrémité la plus basse de chacune des ailettes (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) ou de la face d'extrémité la plus haute de chacune des ailettes (61, 62) de l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b).
  7. Appareil de climatisation selon la revendication 1 ou 2, dans lequel
    la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) sont adjacents les uns aux autres et agencés les uns au-dessus des autres,
    l'ailette (61, 62) de l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) est intégrée dans l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b),
    le mécanisme de réduction de fuites de chaleur est constitué par une encoche (66) située dans l'ailette (61, 62) entre l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) et l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b).
  8. Appareil de climatisation selon la revendication 6 ou 7, dans lequel
    une largeur de l'encoche (66) est supérieure ou égale à une moitié d'une largeur de l'ailette (61, 62).
  9. Appareil de climatisation selon l'une quelconque des revendications 1 à 8, dans lequel
    la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) sont adjacents les uns aux autres et agencés les uns au-dessus des autres,
    une opération de dégivrage est effectuée sur l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) tandis que l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) sert en tant qu'évaporateur dans une opération de chauffage, et ensuite
    une opération de dégivrage est effectuée sur l'échangeur supérieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) tandis que l'échangeur inférieur de la pluralité d'échangeurs de chaleur côté source de chaleur (12a, 12b) sert en tant qu'évaporateur.
EP12889228.8A 2012-11-29 2012-11-29 Dispositif de conditionnement de l'air Active EP2930450B1 (fr)

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JP6880901B2 (ja) * 2017-03-27 2021-06-02 ダイキン工業株式会社 熱交換器ユニット
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JP7034325B2 (ja) * 2018-10-19 2022-03-11 三菱電機株式会社 空調装置
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EP2930450A4 (fr) 2016-09-14
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WO2014083650A1 (fr) 2014-06-05
JPWO2014083650A1 (ja) 2017-01-05

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