WO2019043768A1 - 凝縮器および凝縮器を備えた冷凍装置 - Google Patents
凝縮器および凝縮器を備えた冷凍装置 Download PDFInfo
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- WO2019043768A1 WO2019043768A1 PCT/JP2017/030829 JP2017030829W WO2019043768A1 WO 2019043768 A1 WO2019043768 A1 WO 2019043768A1 JP 2017030829 W JP2017030829 W JP 2017030829W WO 2019043768 A1 WO2019043768 A1 WO 2019043768A1
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- condenser
- refrigerant
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- heat
- inflow
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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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- 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
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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
- 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
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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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
- F25B2400/0403—Refrigeration circuit bypassing means for the condenser
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
Definitions
- the present invention relates to a condenser used in a refrigerant circuit and a refrigeration system provided with the condenser.
- a parallel flow type condenser including a plurality of refrigerant pipes, two header pipes connected to each end of each refrigerant pipe, and a plurality of fins provided between adjacent refrigerant pipes is outside the room.
- an air conditioner used as a heat exchanger for example, refer to patent documents 1).
- the connecting pipe is attached to one of the header pipes, and the fluid that has flowed out from the first end of the connecting pipe strikes the inner side surface of the header pipe to the inside of the refrigerant pipe. It is configured to flow into. Therefore, in this outdoor heat exchanger, the fluid flowing out from the first end of the connection pipe does not intensively flow into only a part of the refrigerant pipes, and the difference in the flow rate of refrigerant in each refrigerant pipe is reduced. It becomes possible to fully exhibit the performance as a heat exchanger.
- the present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a condenser having an improved refrigerant distribution performance and a refrigeration system provided with the condenser.
- the condenser according to the present invention comprises a first condenser for heat exchange of the refrigerant compressed by the compressor, and a heat exchange for the refrigerant exchanged with the first condenser, which is provided below the first condenser.
- a second condenser, and the first condenser is provided above a first inflow part for allowing the refrigerant compressed by the compressor to flow in, and is provided above the first inflow part, and the first condensation is performed.
- a first outlet for causing the refrigerant heat-exchanged in the tank to flow out.
- the condenser concerning the present invention the height difference between the outflow part of the refrigerant of the 1st condenser of the upper row and the outflow part of the refrigerant of the 2nd condenser of the lower stage can be enlarged. Therefore, the flow rate of the liquid-mixed two-phase refrigerant heat-exchanged in the first condenser can be increased to flow into the second condenser. Therefore, the distribution of the two-phase refrigerant is improved, and the distribution performance of the refrigerant can be improved.
- FIG. 2 is a refrigerant circuit diagram of the refrigeration apparatus according to Embodiment 1 of the present invention. It is a figure explaining the flow of the refrigerant of the conventional parallel flow type condenser. It is a figure explaining the flow of the refrigerant
- FIG. 5 is a refrigerant circuit diagram of a refrigeration apparatus according to Embodiment 2 of the present invention.
- FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to Embodiment 1 of the present invention.
- the refrigeration system according to the first embodiment includes an outdoor unit 100 and an indoor unit 200, as shown in FIG. 1, and the outdoor unit 100 and the indoor unit 200 are connected by piping. Further, the refrigeration system includes a refrigerant circuit in which the compressor 1, the condenser 3, the expansion device 6, and the evaporator 7 are sequentially connected by piping, and the refrigerant circulates.
- the outdoor unit 100 includes a compressor 1 and a condenser 3.
- the compressor 1 is, for example, an inverter compressor capable of capacity control, and sucks a low-temperature low-pressure gas refrigerant, compresses the gas refrigerant, and discharges it as a high-temperature high-pressure gas refrigerant.
- the condenser 3 is, for example, an all-aluminum condenser in which each of a refrigerant pipe through which a refrigerant flows and a fin provided on the refrigerant pipe is formed of aluminum.
- the condenser 3 is not necessarily limited to the all aluminum type.
- the condenser 3 is a parallel flow type
- the refrigerant pipe of the condenser 3 has a flat shape. The condenser 3 exchanges heat between the refrigerant from the compressor 1 and the air to condense and liquefy the refrigerant.
- the outdoor unit 100 is configured to include the compressor 1 and the condenser 3, in addition, an oil separator, a receiver, a supercooling heat exchanger, an accumulator, etc. It is good also as composition provided.
- the oil separator is provided on the discharge side of the compressor 1 and separates the oil contained in the refrigerant discharged from the compressor 1 from the refrigerant.
- the receiver is provided on the outlet side of the condenser 3 and stores the liquid refrigerant from the condenser 3 liquefied by the condenser 3.
- the subcooling heat exchanger is provided on the outlet side of the receiver, and performs heat exchange between the refrigerant from the receiver and the air to subcool the refrigerant.
- the accumulator is provided on the suction side of the compressor 1 and stores excess refrigerant.
- the indoor unit 200 includes the throttling device 6 and the evaporator 7.
- the expansion device 6 has a function as a pressure reducing valve or an expansion valve, decompresses a refrigerant and expands it, and is constituted by an electronic expansion valve or the like whose opening degree can be controlled.
- the evaporator 7 exchanges heat between the refrigerant decompressed by the expansion device 6 and the air to evaporate and evaporate the refrigerant.
- FIG. 2 is a view for explaining the flow of the refrigerant in the conventional parallel flow type condenser.
- FIG. 3 is a view for explaining the flow of the refrigerant of the parallel flow type condenser used in the condenser 3 of the refrigeration apparatus according to Embodiment 1 of the present invention.
- FIG. 4 is a view showing a cross section of the refrigerant flow path of the parallel flow type condenser of FIG. 3, (a) is a partial structural view, (b) is a schematic view of (a) and (c) is in (b) It is sectional drawing which takes out and shows the refrigerant pipe of. The arrows in FIGS.
- FIG. 4 shows a cross section of the refrigerant flow path of the first condenser 31, but the cross section of the refrigerant flow path of the second condenser 32 is also the same.
- the conventional parallel flow type condenser comprises a plurality of refrigerant pipes 415, two header pipes 410 connected to each end of each refrigerant pipe 415, and an adjacent refrigerant pipe 415. And a plurality of fins 416 provided. Further, an inflow portion 411 is provided on the upper side of one header pipe 410, and an outflow portion 412 is provided on the lower side thereof.
- the conventional parallel flow type condenser is configured such that the refrigerant flows in from the upper inflow portion 411, flows downward while flowing in the horizontal direction, and flows out from the lower outflow portion 412. Therefore, when the conventional parallel flow type condenser is used as a condenser, since the flow velocity is slow under refrigeration conditions with low evaporation temperature, the flow velocity of the condensed two-phase refrigerant can not be secured, and the distribution of the refrigerant is biased on the lower side May occur.
- the condenser 3 is configured to have the first condenser 31 and the second condenser 32 provided below the first condenser 31. ing.
- the upper first condenser 31 includes a plurality of refrigerant pipes 315, a first header pipe 310A and a second header pipe 310B connected to each end of each refrigerant pipe 315, and an adjacent refrigerant pipe 315. And a plurality of fins 316 provided on the Further, the first inflow portion 311 is provided on the lower side of the first header pipe 310A, and the first outflow portion 312 is provided on the upper side thereof. Further, the first header pipe 310A is provided with a partition (not shown) that divides the area where the first inflow section 311 is connected and the area where the first outflow section 312 is connected.
- the lower second condenser 32 includes a plurality of refrigerant pipes 325, third header pipes 320A and fourth header pipes 320B connected to respective ends of the refrigerant pipes 325, and adjacent refrigerant pipes 325. And a plurality of fins 326 provided between the two.
- the third header pipe 320A is provided with the second inflow portion 321 on the upper side thereof, and the second outflow portion 322 is provided on the lower side thereof. Further, the third header pipe 320A is provided with a partition (not shown) that partitions the area where the second inflow section 321 is connected and the area where the second outflow section 322 is connected.
- the refrigerant flows in from the first inflow portion 311 below the first condenser 31 in the upper stage, and flows in parallel in the horizontal direction as shown in FIG. 3 and FIG. It flows upward through the header pipe 310 B, flows in parallel in the horizontal direction, and flows out from the upper first outlet 312. Further, the refrigerant flowing out of the first outflow portion 312 flows into the second inflow portion 321 on the upper side of the second condenser 32 in the lower stage, and flows in parallel in the horizontal direction as shown in FIG. 3 and FIG.
- the four header pipes 320B are configured to flow downward, flow in parallel in the horizontal direction, and flow out from the lower second outlet 322.
- the condenser 3 performs heat exchange while flowing the refrigerant from the lower side to the upper side in the upper first condenser 31 and performs the heat exchange while flowing the refrigerant from the upper side to the lower side in the lower second condenser 32 It is a structure.
- the two-phase refrigerant having a high ratio of the gas refrigerant or the gas refrigerant flows upward through the second header pipe 310B.
- the two-phase refrigerant having a high ratio of the gas refrigerant or the gas refrigerant flows while rising through the second header pipe 310B.
- the two-phase refrigerant having a high ratio of the liquid refrigerant or the liquid refrigerant flows the second header pipe 310B.
- the influence of pressure loss is reduced, and furthermore, the distribution of the refrigerant is equalized.
- the first condenser 31 has an area of the heat exchange portion formed between the first inflow portion 311 and the second header pipe 310B and between the second header pipe 310B and the first outflow portion 312. It is preferable to make the area smaller than the area of the heat exchange portion formed in By thus forming the area of the heat exchange portion of the first condenser 31, the ratio of the liquid refrigerant flowing to the second header pipe 310B can be lowered.
- the condenser 3 by making the condenser 3 into the above configuration, the height difference between the first outflow portion 312 of the upper first condenser 31 and the second inflow portion 321 of the lower second condenser 32 is increased. be able to. Therefore, the flow rate of the two-phase refrigerant having a high ratio of the liquid refrigerant heat-exchanged by the first condenser 31 in the upper stage can be increased to flow into the second condenser 32 in the lower stage. Therefore, the distribution of the two-phase refrigerant is improved, and the distribution performance of the refrigerant can be improved. Moreover, the heat exchange efficiency is improved by improving the distribution of the two-phase refrigerant, and the heat dissipation performance can be sufficiently exhibited.
- the flow velocity is low under freezing conditions where the evaporation temperature is low, and the flow velocity is further slowed when the equivalent diameter of the flow passage is large like a flat tube. Therefore, in the condenser 3 having the flat refrigerant pipes 315 and 325 as shown in FIG. 4, the above-mentioned effect is remarkable.
- the condenser 3 is, for example, provided with the first condenser 31 and the second condenser 32 in close proximity, and thus the refrigerant flowing in the lower part of the first condenser 31 and the upper part of the second condenser 32
- the heat exchange part 33 which heat-exchanges with the refrigerant
- the heat exchange part 33 is comprised by the lower part of the 1st condenser 31 and the upper part of the 2nd condenser 32, and the clearance gap is formed among them.
- the heat exchange unit 33 may be formed to include a member that promotes heat exchange between the lower portion of the first condenser 31 and the upper portion of the second condenser 32, for example, a metal.
- the refrigerant flowing in the lower part of the first condenser 31 is the high temperature and high pressure gas refrigerant at the inlet of the condenser 3, and the refrigerant flowing in the upper part of the second condenser 32 is condensed in the first condenser 31 and the temperature is lowered It is a phase refrigerant.
- the heat exchange unit 33 exchanges heat between the gas refrigerant flowing in the lower part of the first condenser 31 and the two-phase refrigerant flowing in the upper part of the second condenser 32.
- the condenser 3 is used not only between the wind of the fan (not shown) provided therein and the refrigerant, but also between the first condenser 31 of the upper stage and the second condenser 32 of the lower stage. Heat exchange with the phase refrigerant can also be performed, and the gas refrigerant tends to condense.
- the second inflow portion 321 is provided above the third header pipe 320A, and the second outflow portion 322 is provided below the third header pipe 320A.
- the heat exchange is performed while flowing the refrigerant from the upper side to the lower side, but it is not limited thereto.
- the second inflow portion 321 is provided on the lower side of the third header pipe 320A, and the second outflow portion 322 is provided on the upper side of the third header pipe 320A.
- heat exchange may be performed.
- the refrigerant flows out from the first outflow portion 312 on the upper side of the first condenser 31 in the upper stage, and the lower side of the second condenser 32 in the lower stage. It becomes a structure which flows in into the 2nd inflow part 321 by the side. Therefore, the height difference between the first outflow portion 312 of the upper first condenser 31 and the second inflow portion 321 of the lower second condenser 32 can be further increased.
- the flow rate of the liquid-mixed two-phase refrigerant heat-exchanged in the upper first condenser 31 can be increased to flow into the lower second condenser 32.
- the heat exchange efficiency in the heat exchange unit 33 can be further improved.
- the condenser 3 As described above, the condenser 3 according to the first embodiment is provided below the first condenser 31 and the first condenser 31, which exchanges heat with the refrigerant compressed by the compressor 1, and the first condenser 31 And a second condenser 32 that exchanges heat with the heat-exchanged refrigerant.
- the first condenser 31 is provided at a first inflow portion 311 for allowing the refrigerant compressed by the compressor 1 to flow in, and is provided on the upper side of the first inflow portion 311 and is a refrigerant heat-exchanged in the first condenser 31 And a first outlet 312 for letting out the water.
- the condenser 3 According to the condenser 3 according to the first embodiment, the height difference between the first outflow portion 312 of the upper first condenser 31 and the second inflow portion 321 of the lower second condenser 32 is increased. be able to. Therefore, the flow rate of the liquid-mixed two-phase refrigerant heat-exchanged in the upper first condenser 31 can be increased to flow into the lower second condenser 32. Therefore, the distribution of the two-phase refrigerant is improved, and the distribution performance of the refrigerant can be improved.
- the second condenser 32 of the condenser 3 is provided below the second inflow part 321 for allowing the refrigerant flowing out of the first outflow part 312 to flow in, and below the second inflow part 321. And a second outlet 322 for causing the refrigerant heat-exchanged in the second condenser 32 to flow out.
- the condenser 3 has a heat exchange portion 33 in which the refrigerant flowing in the lower part of the first condenser 31 and the refrigerant flowing in the upper part of the second condenser 32 exchange heat.
- the refrigerant flowing in the lower part of the first condenser 31 is the high-temperature high-pressure gas refrigerant at the inlet of the condenser 3
- the refrigerant flowing in the upper part of the second condenser 32 is A two-phase refrigerant which is condensed by the first condenser 31 and whose temperature is lowered.
- the heat exchange unit 33 exchanges heat between the gas refrigerant flowing in the lower part of the first condenser 31 and the two-phase refrigerant flowing in the upper part of the second condenser 32.
- the condenser 3 is used not only between the wind of the fan (not shown) provided therein and the refrigerant, but also between the first condenser 31 of the upper stage and the second condenser 32 of the lower stage. Heat exchange with the phase refrigerant can also be performed, and the gas refrigerant tends to condense.
- the second condenser 32 of the condenser 3 according to the first embodiment is provided above the second inflow part 321 and the second inflow part 321, into which the refrigerant flowing out of the first outflow part 312 flows. And a second outlet 322 for causing the refrigerant heat-exchanged in the second condenser 32 to flow out.
- the refrigerant flows out from the first outflow portion 312 above the first condenser 31 in the upper stage, and the second inflow under the second condenser 32 in the lower stage. It flows into the part 321. Therefore, the height difference between the first outflow portion 312 of the upper first condenser 31 and the second inflow portion 321 of the lower second condenser 32 can be further increased.
- the refrigerant pipes 315, 325 of the condenser 3 according to the first embodiment are formed of a metal containing aluminum. According to the condenser 3 according to the first embodiment, heat exchange between the lower part of the first condenser 31 and the upper part of the second condenser 32 can be promoted.
- FIG. 5 is a refrigerant circuit diagram of a refrigeration apparatus according to Embodiment 2 of the present invention.
- the condenser 30 according to the second embodiment includes a first bypass pipe 331 which is branched from the first inflow portion 311 and connected to the second inflow portion 321.
- the condenser 30 includes a second bypass pipe 332 branched from the second inflow portion 321 and connected to the second outflow portion 322.
- the condenser 30 is provided with a flow path switching device including, for example, a first valve 51, a second valve 52, a third valve 53, a fourth valve 54, and a fifth valve 55, which are electromagnetic on-off valves. ing.
- the first valve 51 is provided downstream of the first branch point b1 of the pipe that connects the compressor 1 and the first inflow portion 311, and the second valve 52 is provided in the first bypass piping 331.
- the third valve 53 is a second branch point b2 of the pipe connecting the first outflow portion 312 and the second inflow portion 321, and a first junction point where the first bypass piping 331 merges with the second inflow portion 321.
- the fourth valve 54 is provided at the second outflow portion 322, and is provided between j1 and j1.
- the fifth valve 55 is provided upstream of the second junction point j2 of the pipe connecting the second outflow portion 322 and the expansion device 6.
- the first valve 51 and the second valve 52, and the third valve 53 and the fourth valve 54 may be three-way valves.
- the first bypass pipe 331, the second bypass pipe 332, and the flow path switching device are provided in the condenser 30, but the present invention is not limited thereto. It is good also as composition provided separately from.
- first bypass pipe 331 is not limited to the above configuration, and may be branched from the pipe connecting the compressor 1 and the first inflow portion 311 and connected to the second inflow portion 321.
- second bypass pipe 332 is not limited to the above configuration, and may be branched from the pipe connecting the first outflow portion 312 and the second inflow portion 321 and connected to the second outflow portion 322. .
- the refrigeration system further includes a control device 150 that controls the compressor 1, the flow path switching device, and the like.
- the control device 150 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a microcomputer and software that defines the operation.
- the refrigeration system has a first mode in which the refrigerant flows to the first condenser 31 and the second condenser 32, a second mode in which the refrigerant flows to the first condenser 31 but no refrigerant to the second condenser 32, the second condensation One of the third modes in which the refrigerant flows to the vessel 32 but does not flow to the first condenser 31.
- FIG. 6 is a refrigerant circuit diagram during execution of the first mode of the refrigeration apparatus according to Embodiment 2 of the present invention. If refrigerant leakage does not occur in the condenser 30, the controller 150 executes the first mode. When the control device 150 executes the first mode, as shown in FIG. 6, the first valve 51, the third valve 53, and the fifth valve 55 are in the open state, and the second valve 52, the The four valves 54 are closed.
- the refrigerant compressed by the compressor 1 flows into the first condenser 31 from the first inflow portion 311 through the first valve 51.
- the refrigerant heat-exchanged in the first condenser 31 flows out of the first outlet 312, passes through the third valve 53, and flows in the second condenser 32 from the second inlet 321.
- the refrigerant subjected to heat exchange in the second condenser 32 flows out of the second outlet 322, passes through the fifth valve 55, and is expanded in the expansion device 6.
- the refrigerant expanded by the expansion device 6 is evaporated by the evaporator 7 and sucked into the compressor 1.
- the refrigerant flows in the first flow path which flows in the order of the first condenser 31 and the second condenser 32.
- FIG. 7 is a refrigerant circuit diagram during execution of a second mode of the refrigeration apparatus according to Embodiment 2 of the present invention.
- the controller 150 executes the second mode.
- the control device 150 executes the second mode, as shown in FIG. 7, the first valve 51 and the fourth valve 54 are in the open state, and the second valve 52, the third valve 53, and the fifth valve 55 And are closed.
- the refrigerant compressed by the compressor 1 flows into the first condenser 31 from the first inflow portion 311 through the first valve 51.
- the refrigerant heat-exchanged by the first condenser 31 flows out from the first outlet 312, flows into the second bypass pipe 332, passes through the fourth valve 54, and is expanded by the expansion device 6.
- the refrigerant expanded by the expansion device 6 is evaporated by the evaporator 7 and sucked into the compressor 1.
- the refrigerant flows into the first condenser 31 and then flows through the second flow path flowing into the second bypass pipe 332 without flowing into the second condenser 32.
- FIG. 8 is a refrigerant circuit diagram during execution of the third mode of the refrigeration apparatus according to Embodiment 2 of the present invention.
- the control device 150 executes the third mode.
- the control device 150 executes the third mode, as shown in FIG. 8, the second valve 52 and the fifth valve 55 are in the open state, and the first valve 51, the third valve 53, and the fourth valve 54 are opened. And are closed.
- the refrigerant compressed by the compressor 1 flows into the first bypass pipe 331, passes through the second valve 52, and flows into the second condenser 32 from the second inflow portion 321.
- the refrigerant subjected to heat exchange in the second condenser 32 flows out of the second outlet 322, passes through the fifth valve 55, and is expanded in the expansion device 6.
- the refrigerant expanded by the expansion device 6 is evaporated by the evaporator 7 and sucked into the compressor 1.
- the refrigerant flows in the third flow path flowing into the second condenser 32 via the first bypass pipe 331 without flowing into the first condenser 31.
- the refrigeration apparatus can select one of the first mode, the second mode, and the third mode according to the presence or absence of refrigerant leakage in the condenser 30 and the location of the refrigerant leakage. Run. By doing so, even if refrigerant leakage occurs in the condenser 30, the operation can be continued without stopping the operation of the refrigeration system. Therefore, the operation of the refrigeration system can be continued temporarily even during the time until the condenser 30 is replaced with a new one.
- the condenser 30 according to the second embodiment is branched from the first bypass pipe 331 which is branched from the first inflow portion 311 and connected to the second inflow portion 321 and branched from the first outflow portion 312 and is second And a second bypass pipe 332 connected to the outflow portion 322.
- the condenser 30 is equipped with the flow-path switching apparatus switched to either of a 1st flow path, a 2nd flow path, and a 3rd flow path.
- the condenser 30 according to the second embodiment can be used even if a refrigerant leak occurs.
- the refrigeration apparatus includes a refrigerant circuit in which the compressor 1, the condenser 30, the expansion device 6, and the evaporator 7 are connected by piping and a refrigerant circulates.
- a freezing apparatus has 1st mode, 2nd mode, and 3 modes.
- the first mode is a switching mode to the first flow path when refrigerant leakage does not occur in the condenser 30.
- the second mode is a mode in which switching to the second flow path is performed when a refrigerant leak occurs in the second condenser 32.
- the third mode is a mode in which switching to the third flow path is performed when refrigerant leakage occurs in the first condenser 31.
- any one of the first mode, the second mode, and the third mode is executed depending on the presence or absence of the refrigerant leak in the condenser 30 and the location of the refrigerant leak. Therefore, even if refrigerant leakage occurs in the condenser 30, the operation of the refrigeration system can be continued without stopping the operation. Therefore, the operation of the refrigeration system can be continued temporarily even during the time until the condenser 30 is replaced with a new one.
- the refrigerant applied to the refrigeration system of the present invention is not particularly limited.
- the refrigerant applied to the refrigeration system of the present invention may be a single refrigerant such as R32 or a pseudo-azeotropic refrigerant such as R410A, but is a non-azeotropic refrigerant.
- the effect is remarkable. This is because when using non-azeotropic mixed refrigerants having different boiling points, the distribution of the refrigerant tends to be uneven.
- the non-azeotropic mixed refrigerant applied to the refrigeration system of the present invention is R448A, R449A, R407F or the like.
- non-azeotropic mixed refrigerant to be suitably applied to a refrigeration apparatus of the invention, the R32 and R125, and R134a, and R1234yf, a mixed refrigerant of CO 2, the ratio of R32 XR32 (wt%)
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Abstract
Description
図1は、本発明の実施の形態1に係る冷凍装置の冷媒回路図である。
本実施の形態1に係る冷凍装置は、図1に示すように、室外ユニット100と、室内ユニット200と、を備え、室外ユニット100と室内ユニット200とが、配管で接続されている。また、冷凍装置は、圧縮機1、凝縮器3、絞り装置6、および、蒸発器7が配管で順次接続され、冷媒が循環する冷媒回路を備えている。
図2は、従来のパラレルフロー型コンデンサーの冷媒の流れを説明する図である。図3は、本発明の実施の形態1に係る冷凍装置の凝縮器3に用いられているパラレルフロー型コンデンサーの冷媒の流れを説明する図である。図4は、図3のパラレルフロー型コンデンサーの冷媒流路の断面を示す図であり、(a)は部分構造図、(b)は(a)の模式図、(c)は(b)中の冷媒管を取り出して示す断面図である。なお、図2~図4中の矢印は、冷媒の流れを示している。また、図4は、第1凝縮器31の冷媒流路の断面を示しているが、第2凝縮器32の冷媒流路の断面も同様である。
このように、ガス冷媒またはガス冷媒の比率が高い二相冷媒が第2のヘッダーパイプ310Bを上昇しながら流れるため、液冷媒または液冷媒の比率が高い二相冷媒が第2のヘッダーパイプ310Bを上昇しながら流れる場合と比較して、圧力損失の影響が低減され、さらに、冷媒の分配が均一化される。例えば、第1凝縮器31は、第1流入部311から第2のヘッダーパイプ310Bまでの間に形成される熱交換部の面積を、第2のヘッダーパイプ310Bから第1流出部312までの間に形成される熱交換部の面積よりも、小さく形成するとよい。第1凝縮器31の熱交換部の面積をそのように形成することで、第2のヘッダーパイプ310Bに流れる液冷媒の比率を低くすることができる。
以下、本発明の実施の形態2について説明するが、実施の形態1と重複するものについては説明を省略し、実施の形態1と同じ部分または相当する部分には同じ符号を付す。
本実施の形態2に係る凝縮器30は、図5に示すように、第1流入部311から分岐して第2流入部321に接続された第1バイパス配管331を備えている。また、凝縮器30は、第2流入部321から分岐して第2流出部322に接続された第2バイパス配管332を備えている。また、凝縮器30は、例えば電磁開閉弁である、第1バルブ51、第2バルブ52、第3バルブ53、第4バルブ54、および、第5バルブ55で構成された流路切替装置を備えている。
冷凍装置は、第1凝縮器31および第2凝縮器32に冷媒を流す第1モード、第1凝縮器31に冷媒を流すが第2凝縮器32に冷媒を流さない第2モード、第2凝縮器32に冷媒を流すが第1凝縮器31に冷媒を流さない第3モードのうちのいずれかを実行する。
凝縮器30で冷媒漏れが発生していない場合、制御装置150は第1モードを実行する。制御装置150が第1モード実行時は、図6に示すように、第1バルブ51と、第3バルブ53と、第5バルブ55とが開状態となっており、第2バルブ52と、第4バルブ54とが閉状態となっている。
次に、第2凝縮器32で冷媒漏れが発生している場合、制御装置150は第2モードを実行する。制御装置150が第2モード実行時は、図7に示すように、第1バルブ51と第4バルブ54とが開状態となっており、第2バルブ52と第3バルブ53と第5バルブ55とが閉状態となっている。
次に、第1凝縮器31で冷媒漏れが発生している場合、制御装置150は第3モードを実行する。制御装置150が第3モード実行時は、図8に示すように、第2バルブ52と第5バルブ55とが開状態となっており、第1バルブ51と第3バルブ53と第4バルブ54とが閉状態となっている。
Claims (11)
- 圧縮機で圧縮された冷媒を熱交換させる第1凝縮器と、
前記第1凝縮器の下方に設けられ、前記第1凝縮器で熱交換された冷媒を熱交換させる第2凝縮器と、を備え、
前記第1凝縮器は、前記圧縮機で圧縮された冷媒を流入させる第1流入部と、
前記第1流入部よりも上側に設けられ、前記第1凝縮器で熱交換された冷媒を流出させる第1流出部と、を有する
凝縮器。 - 前記第2凝縮器は、
前記第1流出部から流出した冷媒を流入させる第2流入部と、
前記第2流入部よりも下側に設けられ、前記第2凝縮器で熱交換された冷媒を流出させる第2流出部と、を有する
請求項1に記載の凝縮器。 - 前記第1凝縮器の下部を流れる冷媒と前記第2凝縮器の上部を流れる冷媒とが熱交換する熱交換部を有する
請求項2に記載の凝縮器。 - 前記熱交換部は、
前記第1凝縮器の下部と前記第2凝縮器の上部とで構成され、前記第1凝縮器の下部と前記第2凝縮器の上部との間に間隙が形成されているものである
請求項3に記載の凝縮器。 - 前記第2凝縮器は、
前記第1流出部から流出した冷媒を流入させる第2流入部と、
前記第2流入部よりも上側に設けられ、前記第2凝縮器で熱交換された冷媒を流出させる第2流出部と、を有する
請求項1に記載の凝縮器。 - 前記第1流入部から分岐して前記第2流入部に接続された第1バイパス配管と、
前記第1流出部から分岐して前記第2流出部に接続された第2バイパス配管と、
前記第1凝縮器、前記第2凝縮器の順に冷媒を流入させる第1流路、前記第1凝縮器に冷媒を流入させた後、前記第2凝縮器に流入させずに前記第2バイパス配管に流入させる第2流路、前記第1凝縮器に冷媒を流入させずに前記第1バイパス配管を介して前記第2凝縮器に冷媒を流入させる第3流路、のいずれかに切り替える流路切替装置と、を備えた
請求項2~5のいずれか一項に記載の凝縮器。 - 前記第1凝縮器および前記第2凝縮器のそれぞれは、
扁平形状に形成された複数の冷媒管と、前記冷媒管の間に設けられた複数のフィンとを有する
請求項1~6のいずれか一項に記載の凝縮器。 - 前記冷媒管は、
アルミを含む金属で形成されている
請求項7に記載の凝縮器。 - 圧縮機、請求項1~8のいずれか一項に記載の前記凝縮器、絞り装置、および、蒸発器が配管で接続され、冷媒が循環する冷媒回路を備えた
冷凍装置。 - 前記凝縮器で冷媒漏れが発生していない場合、前記第1流路に切り替える第1モードと、第2凝縮器で冷媒漏れが発生している場合、前記第2流路に切り替える第2モードと、第1凝縮器で冷媒漏れが発生している場合、前記第3流路に切り替える第3モードと、を有する
請求項6に従属する請求項9に記載の冷凍装置。 - 前記冷媒は、非共沸混合冷媒である
請求項9または10に記載の冷凍装置。
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