WO2023170743A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
WO2023170743A1
WO2023170743A1 PCT/JP2022/009721 JP2022009721W WO2023170743A1 WO 2023170743 A1 WO2023170743 A1 WO 2023170743A1 JP 2022009721 W JP2022009721 W JP 2022009721W WO 2023170743 A1 WO2023170743 A1 WO 2023170743A1
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WIPO (PCT)
Prior art keywords
outdoor heat
heat exchanger
refrigerant
outdoor
heat exchangers
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PCT/JP2022/009721
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English (en)
Japanese (ja)
Inventor
哲二 七種
祐基 中尾
Original Assignee
三菱電機株式会社
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Priority to PCT/JP2022/009721 priority Critical patent/WO2023170743A1/fr
Publication of WO2023170743A1 publication Critical patent/WO2023170743A1/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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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

Definitions

  • the present disclosure relates to a refrigeration cycle device that performs defrost operation.
  • Patent Document 1 a circuit that flows into an outdoor heat exchanger from an expansion valve is divided into an upper part and a lower part.
  • the upper and lower parts of the outdoor heat exchanger which are divided into two parts are connected in parallel, and each of the pipes on the outlet side when the outdoor heat exchanger functions as a condenser is connected in parallel.
  • a temperature sensor is provided.
  • Patent Document 1 discloses that during defrost operation, it is not known which of the upper and lower parts of the outdoor heat exchanger will complete defrosting first, so when the outdoor heat exchanger functions as a condenser, the temperature is set in each of the pipes on the outlet side. Sensors are provided, and the completion of defrosting is detected for each of the upper and lower parts of the outdoor heat exchanger based on the detected values of each temperature sensor. Therefore, in order to detect the completion of defrosting, the number of temperature sensors required is equal to the number of divided outdoor heat exchangers, and the number of required temperature sensors increases as the number of divided outdoor heat exchangers increases. As a result, there were problems in that the cost increased and the algorithm for determining whether defrost was completed became complicated.
  • the present disclosure has been made to solve the above-mentioned problems, and aims to provide a refrigeration cycle device that reduces costs and suppresses algorithm complexity compared to conventional systems.
  • a refrigeration cycle device includes a compressor, a flow path switching device, an indoor heat exchanger, a throttling device, a plurality of flow rate adjustment valves, and a plurality of outdoor heat exchangers connected by piping, and in which a refrigerant circulates.
  • the refrigerant circuit is configured such that the refrigerant flows in parallel through each of the plurality of outdoor heat exchangers during heating operation, and the refrigerant flows through each of the plurality of outdoor heat exchangers in parallel during cooling operation and defrost operation.
  • the refrigerant is configured to flow in series through a part on the upstream side and a part on the downstream side, and the outlet side of the outdoor heat exchanger is on the downstream side during cooling operation and defrosting operation.
  • a temperature sensor is provided in the piping.
  • the refrigerant circuit is configured such that the refrigerant flows through each of the plurality of outdoor heat exchangers in parallel during heating operation, and the refrigerant circuit is configured so that the refrigerant flows through each of the plurality of outdoor heat exchangers in parallel during cooling operation and defrost operation.
  • the exchanger is configured such that the refrigerant flows in series between a portion on the upstream side and a remaining portion on the downstream side. Therefore, by confirming the completion of defrosting of the outdoor heat exchanger on the downstream side, it can be seen that defrosting has been completed in all outdoor heat exchangers.
  • FIG. 2 is a refrigerant circuit diagram of the refrigeration cycle device according to the first embodiment.
  • FIG. 2 is a perspective view schematically showing an outdoor heat exchanger of the refrigeration cycle device according to the first embodiment.
  • FIG. 2 is a refrigerant circuit diagram during cooling operation of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a refrigerant circuit diagram during heating operation of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a refrigerant circuit diagram of a first modification of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a refrigerant circuit diagram of a second modification of the refrigeration cycle device according to the first embodiment.
  • FIG. 3 is a front perspective view of the outdoor unit of the refrigeration cycle device according to Embodiment 2; FIG.
  • FIG. 3 is a perspective view of the outdoor unit of the refrigeration cycle device according to Embodiment 2, seen from the back.
  • FIG. 3 is an exploded perspective view of the outdoor unit of the refrigeration cycle device according to Embodiment 2, seen from the front.
  • FIG. 2 is an exploded perspective view of the outdoor unit of the refrigeration cycle device according to Embodiment 2, viewed from the side.
  • FIG. 7 is a diagram showing the temperature characteristics of a refrigerant when the refrigerant is passed in series between an outdoor heat exchanger on the upstream side and an outdoor heat exchanger on the downstream side of the refrigeration cycle device according to the third embodiment.
  • FIG. 7 is a diagram showing the temperature characteristics of the refrigerant when the refrigerant is flowed in parallel to each outdoor heat exchanger of the refrigeration cycle device according to the third embodiment.
  • FIG. 1 is a refrigerant circuit diagram of a refrigeration cycle device according to a first embodiment.
  • the refrigeration cycle device according to the first embodiment includes an outdoor unit 10 and an indoor unit 20.
  • the outdoor unit 10 includes a compressor 11, a flow path switching device 12, three outdoor heat exchangers 30 (outdoor heat exchangers 30a to 30c), and two flow rate adjustment valves 13 (a flow rate adjustment valve 13a and a flow rate adjustment valve). 13b), an on-off valve 14, a check valve 15, an accumulator 16, a temperature sensor 17, and an outdoor fan (not shown).
  • the indoor unit 20 includes a throttle device 21, an indoor heat exchanger 22, and an indoor fan (not shown).
  • the refrigeration cycle device is composed of an outdoor unit 10 and an indoor unit 20, and includes a refrigerant circuit 100 in which refrigerant circulates. Specifically, in the refrigerant circuit 100, a compressor 11, a flow path switching device 12, an indoor heat exchanger 22, a throttle device 21, a flow rate adjustment valve 13, and an outdoor heat exchanger 30 are sequentially connected via piping 101. It is composed of: This refrigeration cycle device can perform both a cooling operation and a heating operation by switching the flow path switching device 12, and can also perform a defrost operation.
  • the compressor 11 sucks in low-temperature, low-pressure refrigerant, compresses the sucked refrigerant, and discharges high-temperature, high-pressure refrigerant.
  • the compressor 11 is, for example, an inverter compressor whose capacity, which is the amount of output per unit time, is controlled by changing the operating frequency.
  • the flow path switching device 12 is, for example, a four-way valve, and switches between cooling operation and heating operation by switching the direction in which the refrigerant flows. During cooling operation, the flow path switching device 12 switches to a state shown in FIG. 3, which will be described later, and the discharge side of the compressor 11 and the outdoor heat exchanger 30 are connected. Moreover, the flow path switching device 12 switches to the state shown in FIG. 4 during heating operation, and the discharge side of the compressor 11 and the indoor heat exchanger 22 are connected.
  • the outdoor heat exchanger 30 exchanges heat between outdoor air and a refrigerant.
  • the outdoor heat exchanger 30 functions as a condenser that radiates heat from the refrigerant to outdoor air to condense the refrigerant during cooling operation.
  • the outdoor heat exchanger 30 functions as an evaporator that absorbs heat from the outdoor air to evaporate the refrigerant during heating operation, and cools the outdoor air with the heat of vaporization at that time.
  • the outdoor fan supplies outdoor air to the outdoor heat exchanger 30, and by controlling the rotation speed, the amount of air blown to the outdoor heat exchanger 30 is adjusted.
  • the flow rate adjustment valve 13 is, for example, an electronic expansion valve that can adjust the opening degree of a throttle, and by adjusting the opening degree, controls the pressure of the refrigerant flowing into the outdoor heat exchanger 30 functioning as an evaporator. .
  • the on-off valve 14 is a two-way valve that allows the flow of refrigerant when it is open and restricts the flow of refrigerant when it is closed, and is open during cooling operation and closed during heating operation.
  • the check valve 15 prevents the refrigerant from flowing backward and restricts the refrigerant to flow in only one direction. Note that a two-way valve may be provided instead of the check valve 15.
  • the accumulator 16 is provided on the suction side of the compressor 11, and is used to store surplus refrigerant generated due to differences in operating conditions between cooling operation and heating operation, or surplus refrigerant due to transient changes in operation. be. Furthermore, the accumulator 16 is for preventing the compressor 11 from compressing the liquid.
  • the temperature sensor 17 is, for example, a thermistor, and is provided in the pipe 101a between the outdoor heat exchanger 30c and the flow rate adjustment valve 13b, and detects the temperature of the refrigerant flowing through the pipe 101a. As will be described later, this temperature sensor 17 is provided only in the pipe 101a on the outlet side of the outdoor heat exchanger 30c, which is downstream during the cooling operation and the defrosting operation.
  • the throttle device 21 is, for example, an electronic expansion valve that can adjust the opening degree of the throttle, and controls the pressure of the refrigerant flowing into the outdoor heat exchanger 30 or the indoor heat exchanger 22 by adjusting the opening degree.
  • the throttle device 21 is provided in the indoor unit 20, but it may be provided in the outdoor unit 10, and the installation location is not limited.
  • the indoor heat exchanger 22 exchanges heat between indoor air and refrigerant.
  • the indoor heat exchanger 22 functions as an evaporator that evaporates refrigerant and cools indoor air with the heat of vaporization during cooling operation.
  • the indoor heat exchanger 22 functions as a condenser that radiates heat of the refrigerant to indoor air and condenses the refrigerant during heating operation.
  • the indoor fan supplies indoor air to the indoor heat exchanger 22, and by controlling the rotation speed, the amount of air blown to the indoor heat exchanger 22 is adjusted.
  • FIG. 2 is a perspective view schematically showing the outdoor heat exchanger 30 of the refrigeration cycle device according to the first embodiment.
  • the white arrow shown in FIG. 2 has shown the flow direction of air
  • the black arrow shown in FIG. 2 has shown the flow of a refrigerant
  • the inlet and outlet shown in FIG. 2 indicate the inlet and outlet when the outdoor heat exchanger 30 functions as a condenser.
  • the outdoor heat exchangers 30a to 30c are of the corrugated fin tube type and are of the parallel piping type.
  • the outdoor heat exchangers 30a to 30c are each connected in parallel via piping in the refrigerant circuit 100.
  • Each outdoor heat exchanger 30 has two distribution headers 31 (distribution header 31A and distribution header 31B), a folded header 33, a plurality of flat tubes 34, and a plurality of corrugated fins 35. Note that, hereinafter, the distribution header 31 and the return header 33 are also simply referred to as headers.
  • a pair of headers consisting of two distribution headers 31 and a folded header 33 are arranged vertically separated in the height direction.
  • the folded header 33 is arranged on the upper side due to piping connections, etc., and the two distribution headers 31 are folded back. It is arranged below the header 33.
  • the configured groups of flat tubes 34 are arranged in two rows in the air flow direction.
  • a group of flat tubes 34 in one row are connected to one distribution header 31.
  • H shown in FIG. 2 indicates the height of the group of flat tubes 34 in one row
  • L shown in FIG. 2 indicates the width of the group of flat tubes 34 in one row.
  • the distribution headers 31 are pipes that are connected to other devices constituting the refrigeration cycle device through piping, into which refrigerant, which is a fluid serving as a heat exchange medium, flows in and out, and which branches or merges the refrigerants.
  • Each of the distribution headers 31 has a refrigerant inlet/outlet pipe 32 (refrigerant inlet/outlet pipe 32A and refrigerant inlet/outlet pipe 32B) through which refrigerant from the outside flows in and out.
  • the folding header 33 is a header that serves as a bridge for folding back from a group of flat tubes 34 in one row to a group of flat tubes 34 in the other row.
  • the flat tube 34 has a flat cross section, the outer surface on the longitudinal side of the flat shape along the air flow direction is flat, and the outer surface on the short side perpendicular to the longitudinal direction is curved. It is a certain heat exchanger tube.
  • the flat tube 34 according to Embodiment 1 is a multi-hole flat tube that has a plurality of holes that serve as refrigerant flow paths inside the tube. In the first embodiment, the holes in the flat tube 34 are formed to face in the height direction because they serve as flow paths between the distribution header 31 and the folded header 33. As described above, the flat tubes 34 are arranged at equal intervals in the horizontal direction, with their longitudinal outer surfaces facing each other.
  • each flat tube 34 is inserted into an insertion hole (not shown) that the distribution header 31 and the folded header 33 have, and is brazed and joined.
  • Ru for example, a brazing material containing aluminum is used as a brazing material for brazing.
  • the corrugated fins 35 have a wave shape, are arranged between two adjacent flat tubes 34, and have a plurality of tops joined to the flat surfaces of the flat tubes 34.
  • the outdoor heat exchanger 30 is of a corrugated fin tube type in which the groups of flat tubes 34 are arranged in two rows, but the present invention is not limited to this, and the group of flat tubes 34 is arranged in one row. It may be a corrugated fin tube type in which only one or three or more rows of corrugated fin tubes are arranged.
  • FIG. 3 is a refrigerant circuit diagram during cooling operation of the refrigeration cycle device according to the first embodiment.
  • FIG. 4 is a refrigerant circuit diagram during heating operation of the refrigeration cycle device according to the first embodiment. Note that the arrows shown in FIGS. 3 and 4 indicate the flow of the refrigerant. Next, based on FIGS. 3 and 4, the operations of the refrigeration cycle apparatus during each operation will be described.
  • the high-temperature, high-pressure gas refrigerant that has flowed into the outdoor heat exchangers 30a and 30b exchanges heat with the outdoor air taken in by the outdoor fan, condenses while dissipating heat, and becomes a medium-temperature, high-pressure gas-liquid two-phase refrigerant that releases outdoor heat. It flows out from exchangers 30a, 30b.
  • the medium temperature and high pressure gas-liquid two-phase refrigerant flowing out from the outdoor heat exchangers 30a and 30b flows into the outdoor heat exchanger 30c via the on-off valve 14.
  • the medium-temperature, high-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor heat exchanger 30c exchanges heat with the outdoor air taken in by the outdoor fan, condenses while dissipating heat, and becomes a low-temperature, high-pressure liquid refrigerant that is transferred to the outdoor heat exchanger 30c. flows out from. That is, during cooling operation, the refrigerant circuit 100 connects the outdoor heat exchangers 30a and 30b on the upstream side and the outdoor heat exchanger 30c on the downstream side among the plurality of outdoor heat exchangers 30a to 30c in series. Composed in a flowing manner.
  • the low-temperature, high-pressure liquid refrigerant flowing out from the outdoor heat exchanger 30c flows through the flow rate adjustment valve 13b to the throttling device 21, where the pressure is reduced by the throttling device 21, and it becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant, which is then transferred to the indoor heat exchanger 22. flows into.
  • the low-temperature, low-pressure gas-liquid two-phase refrigerant that has flowed into the indoor heat exchanger 22 exchanges heat with the indoor air taken in by the indoor fan, evaporates while absorbing heat, cools the indoor air, and becomes a low-temperature, low-pressure gas refrigerant. and flows out from the indoor heat exchanger 22.
  • the low-temperature, low-pressure gas refrigerant flowing out of the indoor heat exchanger 22 is sucked into the compressor 11 via the flow path switching device 12 and the accumulator 16, and becomes high-temperature, high-pressure gas refrigerant again.
  • ⁇ Heating operation> In the heating operation, as shown in FIG. 4, the flow path switching device 12 is switched so that the discharge side of the compressor 11 and the indoor heat exchanger 22 are connected, and the on-off valve 14 is closed.
  • the flow rate adjustment valves 13a and 13b are in an open state.
  • the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 22 via the flow path switching device 12 .
  • the high-temperature, high-pressure gas refrigerant that has flowed into the indoor heat exchanger 22 exchanges heat with the indoor air taken in by the indoor fan and condenses while radiating heat, heating the indoor air and turning into a low-temperature, high-pressure liquid refrigerant that generates indoor heat.
  • the low-temperature, high-pressure liquid refrigerant flowing out from the indoor heat exchanger 22 flows into the expansion device 21 and is depressurized by the expansion device 21, becoming a low-temperature, low-pressure gas-liquid two-phase refrigerant, which is then used for outdoor heat exchange via the flow rate adjustment valves 13a and 13b.
  • the liquid flows into vessels 30a to 30c.
  • the low-temperature, low-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor heat exchangers 30a to 30c exchanges heat with the outdoor air taken in by the outdoor fan, evaporates while absorbing heat, and becomes a low-temperature, low-pressure gas refrigerant for outdoor heat exchange.
  • the refrigerant circuit 100 is configured so that the refrigerant flows through each of the plurality of outdoor heat exchangers 30a to 30c in parallel.
  • the low-temperature, low-pressure gas refrigerant flowing out from the outdoor heat exchangers 30a to 30c is sucked into the compressor 11 via the flow path switching device 12 and the accumulator 16, and becomes high-temperature, high-pressure gas refrigerant again.
  • the indoor fan is stopped, the flow path switching device 12 is switched to the same state as during cooling operation, and the on-off valve 14 and flow rate adjustment valves 13a and 13b are also in the same state as during cooling operation. becomes.
  • the defrost operation the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows into the outdoor heat exchangers 30a and 30b, and then into the outdoor heat exchanger 30c.
  • the refrigerant circuit 100 includes the outdoor heat exchangers 30a and 30b on the upstream side and the outdoor heat exchanger on the downstream side among the plurality of outdoor heat exchangers 30a to 30c.
  • the refrigerant is configured to flow in series with 30c.
  • the outdoor heat exchangers 30a to 30c are divided into upstream and downstream sides, and the upstream outdoor heat exchangers 30a and 30b and the downstream outdoor heat exchanger 30c are connected in series.
  • the circuit configuration is as follows. By doing so, the refrigerant with a high temperature flows through the upstream outdoor heat exchangers 30a and 30b first, and then the refrigerant whose temperature has decreased by exchanging heat with outdoor air in the upstream outdoor heat exchangers 30a and 30b. flows through the outdoor heat exchanger 30c on the downstream side.
  • the order in which defrost is completed is that the outdoor heat exchanger 30a, 30b on the upstream side first, and then the outdoor heat exchanger 30b on the downstream side. This becomes an outdoor heat exchanger 30c. That is, by confirming that the defrosting of the outdoor heat exchanger 30c on the downstream side has been completed, it can be seen that the defrosting of all the outdoor heat exchangers 30 has been completed.
  • the number of outdoor heat exchangers 30 used to confirm the completion of defrosting can be reduced. Since the algorithm can be reduced, the complexity of the algorithm can be suppressed compared to the conventional method.
  • whether or not defrosting has been completed in all the outdoor heat exchangers 30 is determined based on the detection value of the temperature sensor 17 and a preset threshold value, and if the detection value of the temperature sensor 17 is equal to or higher than the threshold value, , it is determined that defrosting has been completed.
  • the flow rate adjustment valve 13 is configured to be able to adjust the degree of opening, but it is not limited thereto, and may be configured by a two-way valve that simply opens and closes. . However, if the flow rate adjustment valves 13a and 13b are configured to have adjustable opening degrees, the outdoor heat exchanger 30a functions as an evaporator by adjusting the opening degrees of the flow rate adjustment valves 13a and 13b during heating operation, respectively. The amount of frost formed on the outdoor heat exchanger 30b and the outdoor heat exchanger 30c can be adjusted.
  • FIG. 5 is a refrigerant circuit diagram of a first modification of the refrigeration cycle device according to the first embodiment.
  • the number of outdoor heat exchangers 30 is not limited to three, and may be two or four or more.
  • the refrigerant circuit 100 is as shown in FIG. The configuration will be as shown. That is, in the refrigerant circuit 100, the outdoor heat exchanger 30d and the flow rate adjustment valve 13c are connected in parallel to the outdoor heat exchanger 30c and the flow rate adjustment valve 13b.
  • a temperature sensor 17 is provided in each of the pipe 101a1 between the outdoor heat exchanger 30c and the flow rate adjustment valve 13b, and the pipe 101a2 between the outdoor heat exchanger 30d and the flow rate adjustment valve 13c.
  • the temperature sensor 17 is provided in each of the pipes 101a1 and 101a2 on the outlet side of the outdoor heat exchangers 30c and 30d, which are downstream during the cooling operation and the defrosting operation.
  • whether or not defrosting has been completed in all the outdoor heat exchangers 30 is determined based on the detection value of the temperature sensor 17 and a preset threshold value, and the detection values of the two temperature sensors 17 are both the threshold value. If this is the case, it is determined that defrosting has been completed.
  • FIG. 6 is a refrigerant circuit diagram of a second modification of the refrigeration cycle device according to the first embodiment.
  • the refrigerant circuit 100 may have a configuration as shown in FIG. That is, during cooling operation, the refrigerant circuit 100 connects the outdoor heat exchangers 30a to 30c on the upstream side and the outdoor heat exchanger 30d on the downstream side among the plurality of outdoor heat exchangers 30a to 30d in series. Composed in a flowing manner. Further, during the heating operation and the defrosting operation, the refrigerant circuit 100 is configured so that the refrigerant flows through each of the plurality of outdoor heat exchangers 30a to 30d in parallel.
  • a temperature sensor 17 is provided in the pipe 101a between the outdoor heat exchanger 30d and the flow rate adjustment valve 13b. That is, only one temperature sensor 17 is provided in the pipe 101a on the outlet side of the outdoor heat exchanger 30d, which is downstream during the cooling operation and the defrosting operation.
  • whether or not defrosting has been completed in all the outdoor heat exchangers 30 is determined based on the detection value of the temperature sensor 17 and a preset threshold value, and if the detection value of one temperature sensor 17 is equal to or higher than the threshold value, If so, it is determined that defrosting has been completed. With this circuit configuration, even if the number of outdoor heat exchangers 30 is five or more, only one temperature sensor 17 can be used.
  • the refrigeration cycle device includes the compressor 11, the flow path switching device 12, the indoor heat exchanger 22, the throttle device 21, the plurality of flow rate adjustment valves 13, and the plurality of outdoor heat exchangers 30. It includes a refrigerant circuit 100 connected by piping 101 and in which refrigerant circulates. Moreover, the refrigerant circuit 100 is configured so that the refrigerant flows through each of the plurality of outdoor heat exchangers 30 in parallel during heating operation. Furthermore, the refrigerant circuit 100 is configured such that the refrigerant flows in series between a portion of the plurality of outdoor heat exchangers 30 that is on the upstream side and a portion of the remaining portion that is on the downstream side during the cooling operation and the defrosting operation. has been done. A temperature sensor 17 is provided in the pipe 101a on the outlet side of the outdoor heat exchanger 30, which is downstream during the cooling operation and the defrosting operation.
  • the refrigerant circuit 100 is configured so that the refrigerant flows through each of the plurality of outdoor heat exchangers 30 in parallel during heating operation. Furthermore, the refrigerant circuit 100 is configured such that the refrigerant flows in series between a portion of the plurality of outdoor heat exchangers 30 that is on the upstream side and a portion of the remaining portion that is on the downstream side during the cooling operation and the defrosting operation. has been done. Therefore, if it is confirmed that the defrosting of the outdoor heat exchanger 30 on the downstream side is completed, it can be seen that the defrosting has been completed in all the outdoor heat exchangers 30.
  • only one outdoor heat exchanger 30 is located on the downstream side during the cooling operation and the defrosting operation.
  • the refrigeration cycle device simply by confirming the completion of defrosting of one outdoor heat exchanger 30, it can be known that defrosting has been completed in all outdoor heat exchangers 30. It is possible to suppress the complexity of the algorithm. Furthermore, since only one temperature sensor 17 is required, costs can be reduced compared to the conventional method.
  • the temperature sensor 17 is provided between one outdoor heat exchanger 30 and one flow rate adjustment valve 13 on the downstream side during cooling operation and defrosting operation. There is.
  • one temperature sensor 17 can reliably determine that defrosting has been completed in all outdoor heat exchangers 30.
  • Embodiment 2 will be described below, but the description of parts that overlap with Embodiment 1 will be omitted, and the same or corresponding parts as in Embodiment 1 will be given the same reference numerals.
  • FIG. 7 is a front perspective view of the outdoor unit 10 of the refrigeration cycle device according to the second embodiment.
  • FIG. 8 is a perspective view of the outdoor unit 10 of the refrigeration cycle apparatus according to the second embodiment, viewed from the back.
  • FIG. 9 is an exploded perspective view of the outdoor unit 10 of the refrigeration cycle apparatus according to the second embodiment, viewed from the front.
  • FIG. 10 is an exploded perspective view of the outdoor unit 10 of the refrigeration cycle apparatus according to the second embodiment, viewed from the side.
  • the outdoor unit 10 is a top flow type having an air outlet 41 of an outdoor fan 42 at the center of the upper part of a casing 40 forming an outer shell.
  • the compressor 11 and the like are housed inside the housing 40.
  • an air outlet 41 is formed in the upper center of the housing 40, and as shown in FIGS. 9 and 10, an outdoor fan 42 is located directly below the air outlet 41. It is located.
  • a detachable service panel 43 is provided on the front surface of the housing 40. As shown in FIGS.
  • the outdoor heat exchanger 30 has a flat plate shape, and has independent heat exchangers on three of the four sides of the housing 40, specifically, on the left side, right side, and rear side. It is provided. Moreover, one of the outdoor heat exchangers 30a and 30b, which is on the upstream side during cooling operation and defrosting operation, is provided on the left side surface of the housing 40. Further, the other of the outdoor heat exchangers 30a and 30b, which is on the upstream side during cooling operation and defrosting operation, is provided on the right side surface of the housing 40. Furthermore, an outdoor heat exchanger 30c is provided on the rear surface of the casing 40, which is located downstream during cooling operation and defrosting operation.
  • the outdoor heat exchangers 30a to 30c are arranged so that, when each functions as a condenser, the refrigerant inlet is inside the casing 40, and the refrigerant outlet is outside the casing 40 and on the windward side of the outdoor air flow. be done.
  • the outdoor heat exchanger 30a is provided on the right side of the casing 40, and the outdoor heat exchanger 30b is provided on the left side of the casing 40; It may be.
  • 30c hereinafter also referred to as flat tube group area S3) ((S1+S2)>S3).
  • the flat tube group area S1 to S3 is the product (H ⁇ L) of the height H and width L of the group of flat tubes 34 in the row on the windward side of the outdoor air flow of the outdoor heat exchanger 30. .
  • the flat tube group area S1 and the flat tube group area S2 do not need to be exactly the same, but only need to be approximately the same.
  • the amount of frost formed during heating operation under low outside air conditions can be reduced by There are more heat exchangers 30a and 30b than outdoor heat exchanger 30c on the downstream side. Therefore, during defrost operation, high temperature refrigerant is first flowed into the outdoor heat exchangers 30a and 30b on the upstream side where the amount of frost formation is large, and into the outdoor heat exchanger 30c on the downstream side where the amount of frost formation is small.
  • the refrigerant that has been partially radiated by the outdoor heat exchangers 30a and 30b on the upstream side and then joined together, that is, the refrigerant whose temperature has decreased, is allowed to flow in. By doing so, it becomes possible to input the amount of heat of fusion according to the amount of frost formation, and it becomes possible to defrost efficiently.
  • the refrigerant having a high temperature can be evenly distributed and allowed to flow into the outdoor heat exchanger 30a and the outdoor heat exchanger 30b. Therefore, it is possible to suppress unmelted frost due to drift toward the left and right side surfaces of the housing 40.
  • the plurality of outdoor heat exchangers 30 are arranged in one outdoor unit 10.
  • the outdoor unit 10 is a top flow type in which an outdoor fan 42 is provided at the top, and there are three outdoor heat exchangers 30, each of which is installed on the left side, right side, and rear side of the outdoor unit 10. It is located.
  • the area of the flat tube group of the outdoor heat exchanger 30 arranged on the left side of the outdoor unit 10 (flat tube group area S1) and the flat tube group of the outdoor heat exchanger 30 arranged on the right side of the outdoor unit 10 is the same, and the area of the flat tube group of the outdoor heat exchanger 30 arranged on the left side of the outdoor unit 10 (flat tube group area S1) is the same as the area of the flat tube group of the outdoor unit 10
  • the sum of the area of the flat tube group of the outdoor heat exchanger 30 disposed on the right side is the area of the flat tube group of the outdoor heat exchanger 30 disposed on the rear surface of the outdoor unit 10 ( It is larger than the flat tube group area S3).
  • the sum of the flat tube group area S1 and the flat tube group area S2 is made larger than the flat tube group area S3.
  • the amount of frost formed during heating operation under low outside air conditions is greater on the outdoor heat exchanger 30 on the upstream side than on the outdoor heat exchanger 30 on the downstream side. Therefore, during defrost operation, the high temperature refrigerant is first flowed into the outdoor heat exchanger 30 on the upstream side where the amount of frost formation is large, and the refrigerant on the upstream side is flowed into the outdoor heat exchanger 30 on the downstream side where the amount of frost formation is small.
  • the refrigerant that has been partially radiated in the outdoor heat exchanger 30 and then joined together, that is, the refrigerant whose temperature has decreased, is allowed to flow in. By doing so, it becomes possible to input the amount of heat of fusion according to the amount of frost formation, and it becomes possible to defrost efficiently.
  • Embodiment 3 will be described below, but the description of parts that overlap with Embodiments 1 and 2 will be omitted, and the same or corresponding parts as in Embodiments 1 and 2 will be given the same reference numerals.
  • FIG. 11 is a diagram showing the temperature characteristics of the refrigerant when the refrigerant is passed in series between the outdoor heat exchanger 30 on the upstream side and the outdoor heat exchanger 30 on the downstream side of the refrigeration cycle device according to the third embodiment. It is.
  • FIG. 12 is a diagram showing the temperature characteristics of the refrigerant when the refrigerant is flowed in parallel to each outdoor heat exchanger 30 of the refrigeration cycle device according to the third embodiment.
  • the horizontal axis of FIG. 11 and FIG. 12 shows the degree of dryness
  • the vertical axis shows the temperature.
  • the refrigerant that circulates in the refrigerant circuit 100 is a mixed refrigerant that is a mixture of refrigerants with different boiling points, such as R410A, R454A, R454B, R454C, and R466A.
  • the refrigerant circulating in the refrigerant circuit 100 is a mixed refrigerant that is a mixture of refrigerants with different boiling points.
  • the change in dryness at the entrance and exit of each outdoor heat exchanger 30 is small, and the change in the temperature at the entrance and exit of the outdoor heat exchanger 30 is also small, so it becomes possible to melt the frost evenly, and the frost melts. The rest can be suppressed.
  • the environmental load can be reduced.
  • the outdoor heat exchanger 30 a corrugated fin tube type using the flat tubes 34, the amount of refrigerant used can be reduced.
  • the refrigerant is a mixed refrigerant that is a mixture of refrigerants with different boiling points.
  • the change in dryness at the entrance and exit of each outdoor heat exchanger 30 is small, and the change in the temperature at the entrance and exit of the outdoor heat exchanger 30 is small, so that frost can be melted evenly. This makes it possible to suppress unmelted frost.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

L'invention concerne un dispositif à cycle frigorifique qui comprend : un compresseur ; un dispositif de commutation de trajet d'écoulement ; un échangeur de chaleur interne ; un dispositif d'étranglement ; une pluralité de soupapes de régulation d'écoulement ; et un circuit de fluide frigorigène auquel une pluralité d'échangeurs de chaleur externes sont reliés par une tuyauterie et dans lequel circule un fluide frigorigène. Le circuit de fluide frigorigène est conçu de telle sorte que le fluide frigorigène s'écoule en parallèle à travers chacun de la pluralité d'échangeurs de chaleur externes pendant une opération de chauffage, et est conçu de telle sorte que le fluide frigorigène s'écoule en série à travers certains de la pluralité d'échangeurs de chaleur externes servant de côté amont et de la pluralité restante d'échangeurs de chaleur externes servant de côté aval pendant une opération de refroidissement et pendant une opération de dégivrage. Un capteur de température est disposé sur un côté de sortie d'un échange de chaleur externe servant de côté aval pendant l'opération de refroidissement et pendant l'opération de dégivrage.
PCT/JP2022/009721 2022-03-07 2022-03-07 Dispositif à cycle frigorifique WO2023170743A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/009721 WO2023170743A1 (fr) 2022-03-07 2022-03-07 Dispositif à cycle frigorifique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/009721 WO2023170743A1 (fr) 2022-03-07 2022-03-07 Dispositif à cycle frigorifique

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WO2023170743A1 true WO2023170743A1 (fr) 2023-09-14

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008157558A (ja) * 2006-12-25 2008-07-10 Daikin Ind Ltd 空気調和装置
JP2012063033A (ja) * 2010-09-14 2012-03-29 Panasonic Corp 空気調和機
WO2013183710A1 (fr) * 2012-06-07 2013-12-12 三菱電機株式会社 Unité extérieure de climatisation
WO2015162689A1 (fr) * 2014-04-22 2015-10-29 三菱電機株式会社 Conditionneur d'air
WO2016208042A1 (fr) * 2015-06-25 2016-12-29 三菱電機株式会社 Dispositif de climatisation
WO2017145762A1 (fr) * 2016-02-23 2017-08-31 三菱電機株式会社 Dispositif de pompe à chaleur et climatiseur associé
WO2018173297A1 (fr) * 2017-03-24 2018-09-27 東芝キヤリア株式会社 Dispositif de climatisation
JP2020020576A (ja) * 2019-11-08 2020-02-06 三菱電機株式会社 冷凍サイクル装置およびそれを備えた空気調和装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008157558A (ja) * 2006-12-25 2008-07-10 Daikin Ind Ltd 空気調和装置
JP2012063033A (ja) * 2010-09-14 2012-03-29 Panasonic Corp 空気調和機
WO2013183710A1 (fr) * 2012-06-07 2013-12-12 三菱電機株式会社 Unité extérieure de climatisation
WO2015162689A1 (fr) * 2014-04-22 2015-10-29 三菱電機株式会社 Conditionneur d'air
WO2016208042A1 (fr) * 2015-06-25 2016-12-29 三菱電機株式会社 Dispositif de climatisation
WO2017145762A1 (fr) * 2016-02-23 2017-08-31 三菱電機株式会社 Dispositif de pompe à chaleur et climatiseur associé
WO2018173297A1 (fr) * 2017-03-24 2018-09-27 東芝キヤリア株式会社 Dispositif de climatisation
JP2020020576A (ja) * 2019-11-08 2020-02-06 三菱電機株式会社 冷凍サイクル装置およびそれを備えた空気調和装置

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