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WO2025224869A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique

Info

Publication number
WO2025224869A1
WO2025224869A1 PCT/JP2024/016035 JP2024016035W WO2025224869A1 WO 2025224869 A1 WO2025224869 A1 WO 2025224869A1 JP 2024016035 W JP2024016035 W JP 2024016035W WO 2025224869 A1 WO2025224869 A1 WO 2025224869A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
refrigeration cycle
path switching
flow path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/016035
Other languages
English (en)
Japanese (ja)
Inventor
洋次 尾中
理人 足立
七海 岸田
暁 八柳
宏典 薮内
博幸 岡野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2024/016035 priority Critical patent/WO2025224869A1/fr
Publication of WO2025224869A1 publication Critical patent/WO2025224869A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates

Definitions

  • This disclosure relates to a refrigeration cycle device equipped with a heat exchanger having multiple flat tubes.
  • the heat exchanger in Patent Document 1 comprises a heat exchange element having a plurality of flat tubes arranged at intervals in the horizontal direction, an upper header provided at the upper end of the heat exchange element, and a lower header provided at the lower end of the heat exchange element.
  • the heat exchanger also comprises partition plates provided inside at least one of the upper and lower headers, which divide the heat exchange element horizontally into a plurality of regions. The partition plates are arranged so that each region flows countercurrently to adjacent regions, and so that the cross-sectional area of the flow path of each region decreases from the upstream side to the downstream side of the refrigerant flow when the heat exchanger functions as a condenser.
  • the heat exchanger of Patent Document 1 has a partition plate installed inside the header, which increases pressure loss inside the header. Furthermore, if a partition plate is not installed inside the header, when the heat exchanger functions as an evaporator and two-phase gas-liquid refrigerant flows in through an inlet formed at one end of the header, the liquid phase of the refrigerant will be biased to the other end of the header due to inertial force, resulting in a problem of poor distribution performance.
  • This disclosure has been made to solve the above-mentioned problems, and aims to provide a refrigeration cycle device that improves refrigerant distribution performance while suppressing pressure loss in the heat exchanger.
  • the refrigeration cycle device disclosed herein comprises a refrigerant circuit in which a refrigerant circulates, including a compressor, a flow path switching device, a first heat exchanger, a throttling device, and a second heat exchanger connected by refrigerant piping;
  • the first heat exchanger comprises a plurality of flat tubes arranged horizontally in parallel at intervals and extending vertically, through which the refrigerant flows; an upper header provided above the flat tubes so that the upper ends of the flat tubes protrude inward, and having a refrigerant inlet; and a lower header provided below the flat tubes and having a refrigerant outlet; and the flow path switching device is configured to allow the refrigerant to flow into the refrigerant inlet and to flow out from the refrigerant outlet, whether the first heat exchanger functions as an evaporator or a condenser.
  • the flow path switching device is configured to allow refrigerant to flow into the refrigerant inlet and out of the refrigerant outlet, whether the first heat exchanger functions as an evaporator or a condenser. Therefore, when the first heat exchanger functions as an evaporator, a two-phase gas-liquid refrigerant flows into the upper header, but the liquid phase of the refrigerant collides with the upper ends of the multiple flat tubes, weakening the inertial force, improving distribution performance even without a partition plate inside the header. As a result, refrigerant distribution performance can be improved while suppressing pressure loss in the heat exchanger.
  • FIG. 1 is a refrigerant circuit diagram showing a refrigeration cycle device including a heat exchanger according to a first embodiment.
  • 3 is a front view schematically showing a refrigerant flow when the heat exchanger according to the first embodiment functions as an evaporator.
  • FIG. 10 is a front view schematically showing the refrigerant flow and the flow path switching device when the heat exchanger according to the second embodiment functions as an evaporator.
  • FIG. 10 is a front view schematically showing the refrigerant flow and the flow path switching device when the heat exchanger according to the third embodiment functions as an evaporator.
  • FIG. 10 is a front view schematically showing the refrigerant flow and the flow path switching device when the heat exchanger according to the fourth embodiment functions as an evaporator.
  • FIG. FIG. 10 is a perspective view schematically showing the flow of refrigerant when the heat exchanger according to the fifth embodiment functions as an evaporator.
  • FIG. 10 is a perspective view showing a heat exchanger according to
  • Fig. 1 is a refrigerant circuit diagram showing a refrigeration cycle apparatus 100 including a heat exchanger 30 according to embodiment 1. Note that solid arrows in Fig. 1 indicate the refrigerant flow during cooling operation, and dashed arrows in Fig. 1 indicate the refrigerant flow during heating operation.
  • a refrigeration cycle apparatus 100 equipped with a heat exchanger 30 will be described using Figure 1.
  • an air conditioner is used as an example of the refrigeration cycle apparatus 100, but the refrigeration cycle apparatus 100 is used for refrigeration or air conditioning purposes, such as refrigerators, freezers, vending machines, air conditioners, refrigeration systems, and water heaters.
  • the refrigerant circuit 110 shown in the figure is only an example, and the configuration of the circuit elements is not limited to the contents described in the embodiment, and can be modified as appropriate within the scope of the technology related to the embodiment.
  • the heat exchanger 30 is mounted on the outdoor unit 10 of a refrigeration cycle apparatus 100, which includes an outdoor unit 10 and an indoor unit 20.
  • the outdoor unit 10 includes a compressor 11, a flow path switching device 40, and a heat exchanger 30 (hereinafter also referred to as the first heat exchanger).
  • the indoor unit 20 includes an expansion device 21 and an indoor heat exchanger 22 (hereinafter also referred to as the second heat exchanger).
  • the refrigeration cycle apparatus 100 also includes a refrigerant circuit 110 in which a compressor 11, a flow path switching device 40, a heat exchanger 30, a throttling device 21, and an indoor heat exchanger 22 are connected in sequence by refrigerant piping, and through which the refrigerant circulates.
  • the refrigeration cycle apparatus 100 can operate in both cooling and heating modes by switching the flow path switching device 40.
  • Compressor 11 draws in low-temperature, low-pressure refrigerant, compresses it, and discharges high-temperature, high-pressure refrigerant.
  • Compressor 11 is, for example, an inverter compressor whose capacity, or the amount of refrigeration delivered per unit time, is controlled by changing the operating frequency.
  • the flow path switching device 40 is composed of two four-way valves 41, 42, and switches between cooling and heating operations by switching the direction of refrigerant flow. During cooling operation, the flow path switching device 40 switches the two four-way valves 41, 42 to the state shown by the solid lines in Figure 1, connecting the discharge side of the compressor 11 to the heat exchanger 30. During heating operation, the flow path switching device 40 switches the two four-way valves 41, 42 to the state shown by the dashed lines in Figure 1, connecting the discharge side of the compressor 11 to the indoor heat exchanger 22.
  • the heat exchanger 30 exchanges heat between the outdoor air and the refrigerant.
  • the heat exchanger 30 functions as a condenser, releasing heat from the refrigerant into the outdoor air to condense the refrigerant.
  • the heat exchanger 30 functions as an evaporator, evaporating the refrigerant and cooling the outdoor air with the heat of vaporization.
  • the throttling device 21 is, for example, an electronic expansion valve that can adjust the throttle opening, and by adjusting the opening, it controls the pressure of the heat exchanger 30 or the refrigerant flowing into the heat exchanger 30. Note that in Embodiment 1, the throttling device 21 is provided in the outdoor unit 10, but it may also be provided in the indoor unit 20, and the installation location is not limited.
  • the indoor heat exchanger 22 exchanges heat between the indoor air and the refrigerant.
  • the indoor heat exchanger 22 functions as an evaporator, evaporating the refrigerant and cooling the outdoor air with the heat of vaporization.
  • the indoor heat exchanger 22 functions as a condenser, radiating heat from the refrigerant to the outdoor air to condense the refrigerant.
  • the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows into the heat exchanger 30 via the four-way valves 41 and 42 of the flow switching device 40.
  • the high-temperature, high-pressure gas refrigerant that has flowed into the heat exchanger 30 exchanges heat with outdoor air taken in by a fan (not shown), condenses while releasing heat, and becomes low-temperature, high-pressure liquid refrigerant, which flows out of the heat exchanger 30.
  • the low-temperature, high-pressure liquid refrigerant that has flowed out of the heat exchanger 30 flows into the expansion device 21 via the four-way valve 42 of the flow switching device 40, is decompressed by the expansion device 21, and becomes a low-temperature, low-pressure two-phase gas-liquid refrigerant that flows into the indoor heat exchanger 22.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant that has flowed into the indoor heat exchanger 22 exchanges heat with indoor air taken in by the indoor fan (not shown), evaporates while absorbing heat, cools the indoor air, and flows out of the indoor heat exchanger 22 as a low-temperature, low-pressure gas refrigerant.
  • the low-temperature, low-pressure gas refrigerant flowing out from the indoor heat exchanger 22 is drawn into the compressor 11 via the four-way valve 41 of the flow path switching device 40, and becomes high-temperature, high-pressure gas refrigerant again.
  • the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 22 via the four-way valve 41 of the flow switching device 40.
  • the high-temperature, high-pressure gas refrigerant that has flowed into the indoor heat exchanger 22 exchanges heat with indoor air taken in by an indoor fan (not shown) and condenses while releasing heat, heating the indoor air and becoming a low-temperature, high-pressure liquid refrigerant that flows out of the indoor heat exchanger 22.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant that has flowed into the heat exchanger 30 exchanges heat with the outdoor air taken in by the fan (not shown), evaporates while absorbing heat, and flows out of the heat exchanger 30 as a low-temperature, low-pressure gas refrigerant.
  • the low-temperature, low-pressure gas refrigerant flowing out of the heat exchanger 30 is drawn into the compressor 11 via the four-way valves 42 and 41 of the flow path switching device 40, and becomes high-temperature, high-pressure gas refrigerant again.
  • ⁇ Configuration of heat exchanger 30> 2 is a front view schematically illustrating the flow of refrigerant when the heat exchanger 30 according to the first embodiment functions as an evaporator.
  • the arrows in FIG. 2 indicate the flow of refrigerant.
  • the heat exchanger 30 includes a plurality of flat tubes 31 and a plurality of fins 32.
  • the flat tubes 31 have a flat shape and are formed with a plurality of flow paths (not shown) arranged in a row through which the refrigerant flows.
  • the flat tubes 31 are spaced apart and arranged in parallel in a horizontal direction (left-right direction in FIG. 2), which is perpendicular to the airflow direction, so that the air generated by a fan (not shown) can flow through them.
  • the refrigerant flows vertically through the tubes extending vertically (up-down direction in FIG. 2).
  • the fins 32 are connected between adjacent flat tubes 31 and transfer heat to the flat tubes 31.
  • the fins 32 improve the heat exchange efficiency between the air and the refrigerant, and are, for example, corrugated fins. However, this is not limiting. Since heat exchange between the air and the refrigerant occurs on the surfaces of the flat tubes 31, the fins 32 may not be required.
  • a horizontally extending upper header 33 is provided at the upper ends 31a of the multiple flat tubes 31.
  • the upper ends 31a of the multiple flat tubes 31 are directly inserted into the upper header 33.
  • a horizontally extending lower header 34 is provided at the lower ends 31b of the multiple flat tubes 31.
  • the lower ends 31b of the multiple flat tubes 31 are directly inserted into the lower header 34. Note that below, when there is no need to distinguish between the upper header 33 and the lower header 34, they will be referred to as headers.
  • a refrigerant inlet 33a is formed at one longitudinal (horizontal) end of the upper header 33, and an inlet pipe 35 is provided at the refrigerant inlet 33a. Furthermore, a refrigerant outlet 34a is formed at one longitudinal (horizontal) end of the lower header 34, and an outlet pipe 36 is provided at the refrigerant outlet 34a.
  • the heat exchanger 30 is connected to the refrigerant circuit 110 of the refrigeration cycle device 100 via the inlet pipe 35 and outlet pipe 36.
  • the flat tubes 31, fins 32, lower header 34, and upper header 33 are all made of aluminum, for example, and are joined by brazing.
  • the flow path switching device 40 is configured so that refrigerant flows in through the refrigerant inlet 33a of the upper header 33 of the heat exchanger 30 and flows out through the refrigerant outlet 34a of the lower header 34, whether the refrigeration cycle device 100 is in cooling or heating operation.
  • the flow path switching device 40 is configured so that refrigerant flows into the refrigerant inlet 33a and flows out through the refrigerant outlet 34a, whether the heat exchanger 30 is functioning as an evaporator or a condenser.
  • the upper ends 31a of the multiple flat tubes 31 each protrude upward from the bottom of the upper header 33 and are positioned in the upper distribution space 33c within the upper header 33. Therefore, when the heat exchanger 30 functions as an evaporator, the liquid-phase LR of the gas-liquid two-phase refrigerant collides with the upper ends 31a before the refrigerant flowing from the refrigerant inlet 33a into the upper distribution space 33c is distributed to the multiple flat tubes 31, weakening the inertial force.
  • the heat exchanger 30 functions as a condenser
  • the refrigerant flows in through the refrigerant inlet 33a and flows out through the refrigerant outlet 34a, causing the refrigerant flow inside the flat tubes 31 to become a downward flow, and the liquid film formed inside the flat tubes 31 becomes thinner due to the influence of gravity, thereby improving heat transfer performance.
  • the heat exchanger 30 functions as an evaporator or a condenser, by configuring it so that the refrigerant flows into the refrigerant inlet 33a and flows out through the refrigerant outlet 34a, it is possible to improve refrigerant distribution performance, suppress pressure loss within the header, and further improve heat transfer performance.
  • the refrigeration cycle apparatus 100 includes a refrigerant circuit 110 in which a refrigerant circulates, with the compressor 11, flow path switching device 40, first heat exchanger, expansion device 21, and second heat exchanger connected by refrigerant piping.
  • the first heat exchanger includes a plurality of flat tubes 31 arranged horizontally in parallel at intervals and extending vertically, through which a refrigerant flows; an upper header 33 provided above the flat tubes 31 so that the upper ends 31a of the flat tubes 31 protrude inward, and having a refrigerant inlet 33a; and a lower header 34 provided below the flat tubes 31 and having a refrigerant outlet 34a.
  • the flow path switching device 40 is configured to allow the refrigerant to flow into the refrigerant inlet 33a and to flow out from the refrigerant outlet 34a, whether the first heat exchanger functions as an evaporator or a condenser.
  • the flow path switching device 40 is configured to allow refrigerant to flow into the refrigerant inlet 33a and flow out from the refrigerant outlet 34a, whether the first heat exchanger functions as an evaporator or a condenser. Therefore, when the first heat exchanger functions as an evaporator, a two-phase gas-liquid refrigerant flows into the upper header 33. However, the liquid-phase refrigerant LR collides with the upper ends 31a of the flat tubes 31, weakening the inertial force, improving distribution performance even without a partition plate inside the header. As a result, refrigerant distribution performance can be improved while suppressing pressure loss in the first heat exchanger.
  • Embodiment 2 Hereinafter, the second embodiment will be described, but the description of the same parts as those in the first embodiment will be omitted, and the same or corresponding parts as those in the first embodiment will be denoted by the same reference numerals.
  • FIG. 3 is a front view schematically illustrating the refrigerant flow and flow path switching device 40 when the heat exchanger 30 according to embodiment 2 functions as an evaporator. Note that the thin solid arrows and thick solid arrows in FIG. 3 indicate the refrigerant flow during cooling operation, and the dashed arrows and thick solid arrows indicate the refrigerant flow during heating operation.
  • the flow path switching device 40 is composed of three on-off valves 43, 44, and 45, which are opened and closed to switch between cooling operation and heating operation.
  • the flow path switching device 40 switches the on-off valves 43 and 45 to a closed state and the on-off valve 44 to an open state, connecting the discharge side of the compressor 11 to the multiple heat exchangers 30.
  • the flow path switching device 40 switches the on-off valves 43 and 45 to an open state and the on-off valve 44 to a closed state, connecting the discharge side of the compressor 11 to the indoor heat exchanger 22.
  • the flow path switching device 40 can be configured at a lower cost than in embodiment 1, which is configured with two four-way valves 41 and 42.
  • the flow path switching device 40 is equipped with three on-off valves 43, 44, and 45.
  • the flow path switching device 40 is configured with three on-off valves 43, 44, and 45, which allows the flow path switching device 40 to be constructed at a lower cost than in the first embodiment, which is configured with two four-way valves 41 and 42.
  • Embodiment 3 Hereinafter, the third embodiment will be described, but explanations of parts that overlap with the first and second embodiments will be omitted, and parts that are the same as or equivalent to those of the first and second embodiments will be given the same reference numerals.
  • FIG. 4 is a front view schematically illustrating the refrigerant flow and flow path switching device 40 when the heat exchanger 30 according to embodiment 3 functions as an evaporator. Note that the thin solid arrows and thick solid arrows in FIG. 4 indicate the refrigerant flow during cooling operation, and the dashed arrows and thick solid arrows indicate the refrigerant flow during heating operation.
  • the flow path switching device 40 is composed of one on-off valve 46 and two check valves 47, 48, and switches between cooling operation and heating operation by opening and closing the on-off valve 46.
  • the on-off valve 46 of the flow path switching device 40 is switched to a closed state, connecting the discharge side of the compressor 11 to the heat exchanger 30.
  • the on-off valve 46 of the flow path switching device 40 is switched to an open state, connecting the discharge side of the compressor 11 to the indoor heat exchanger 22.
  • the flow path switching device 40 can be configured at a lower cost than in embodiment 1, which is configured with two four-way valves 41 and 42.
  • the flow path switching device 40 includes one on-off valve 46 and two check valves 47 and 48.
  • the flow path switching device 40 is configured with one on-off valve 46 and two check valves 47 and 48, which allows the flow path switching device 40 to be constructed at a lower cost than in embodiment 1, which is configured with two four-way valves 41 and 42.
  • Embodiment 4 Hereinafter, the fourth embodiment will be described, but explanations of parts that overlap with the first to third embodiments will be omitted, and parts that are the same as or equivalent to the first to third embodiments will be given the same reference numerals.
  • FIG. 5 is a front view schematically illustrating the refrigerant flow and flow path switching device 40 when the heat exchanger 30 according to embodiment 4 functions as an evaporator. Note that the thin solid arrows and thick solid arrows in FIG. 5 indicate the refrigerant flow during cooling operation, and the dashed arrows and thick solid arrows indicate the refrigerant flow during heating operation.
  • the flow path switching device 40 is configured with two on-off valves 49, 50 and one flow rate adjustment valve 51, which are opened and closed to switch between cooling and heating operation.
  • the refrigeration cycle apparatus 100 according to embodiment 4 also includes multiple (two in embodiment 4) heat exchangers 30, which are connected in parallel. During cooling operation, the flow path switching device 40 switches the on-off valve 49 and the flow rate adjustment valve 51 to a closed state and the on-off valve 45 to an open state, connecting the discharge side of the compressor 11 to the multiple heat exchangers 30.
  • the flow path switching device 40 switches the on-off valve 49 and the flow rate adjustment valve 51 to an open state and the on-off valve 50 to a closed state, connecting the discharge side of the compressor 11 to the indoor heat exchanger 22. While the flow path switching device 40 according to embodiment 4 is configured with two on-off valves 49, 50 and one flow rate adjustment valve 51, this is not limiting. The two on-off valves 49, 50 may be flow rate adjustment valves, and the flow path switching device 40 only needs to be equipped with at least one flow rate adjustment valve.
  • the flow rate adjustment valve 51 can adjust the refrigerant flow rate through multiple heat exchangers 30 connected in parallel to match the thermal load of those heat exchangers.
  • the flow path switching device 40 includes at least one flow rate adjustment valve 51.
  • the flow path switching device 40 is configured to include at least one flow rate adjustment valve 51, which allows the flow rate adjustment valve 51 to adjust the refrigerant flow rate through multiple heat exchangers 30 connected in parallel in accordance with the thermal load of the heat exchangers 30.
  • Embodiment 5 Hereinafter, the fifth embodiment will be described, but explanations of parts that overlap with the first to fourth embodiments will be omitted, and parts that are the same as or equivalent to those of the first to fourth embodiments will be given the same reference numerals.
  • Figure 6 is a perspective view that schematically illustrates the refrigerant flow when the heat exchanger 30 according to embodiment 5 functions as an evaporator. Note that the dashed arrows in Figure 6 indicate the refrigerant flow, and the hollow arrows indicate the air flow direction.
  • the refrigeration cycle apparatus 100 includes multiple (two in the fifth embodiment) heat exchangers 30A, 30B spaced apart in the air flow direction.
  • the refrigerant outlet 34Aa of the lower header 34A of one of the adjacent heat exchangers 30A, 30B is connected to the refrigerant inlet 33Ba of the upper header 33B of the other heat exchanger 30B by a connecting pipe 60.
  • the refrigerant outlet 34a of the lower header 34 of one of the adjacent heat exchangers 30 is similarly connected to the refrigerant inlet 33a of the upper header 33 of the other heat exchanger 30 by a connecting pipe 60.
  • the multiple heat exchangers 30 are connected in series.
  • the refrigeration cycle apparatus 100 includes multiple first heat exchangers spaced apart in the air flow direction, and of two first heat exchangers adjacent to each other in the air flow direction, the refrigerant outlet 34a of the lower header 34 of one first heat exchanger is connected to the refrigerant inlet 33a of the upper header 33 of the other first heat exchanger by a connecting pipe 60.
  • Embodiment 6 Hereinafter, the sixth embodiment will be described, but explanations of parts that overlap with the first to fifth embodiments will be omitted, and parts that are the same as or equivalent to the first to fifth embodiments will be given the same reference numerals.
  • FIG. 7 is a perspective view showing a heat exchanger 30 according to a sixth embodiment.
  • the heat exchanger 30 according to the sixth embodiment has an L-shape in plan view, with L-bend portions 38, 39 provided in the upper header 33 and the lower header 34.
  • the first heat exchanger has an L-shape in plan view.
  • the uneven distribution of liquid refrigerant caused by centrifugal force at the L-bend portion 38 of the upper header 33 can be improved by stirring the refrigerant at the upper end portion 31a of the flat tubes 31. Furthermore, since there is no need to install an additional distribution improvement structure inside the header, it is easy to perform L-bending processing on the header.
  • Embodiment 7 Hereinafter, the seventh embodiment will be described, but explanations of parts that overlap with those of the first to sixth embodiments will be omitted, and parts that are the same as or equivalent to those of the first to sixth embodiments will be given the same reference numerals.
  • the refrigerant flowing through the refrigerant circuit 110 is a single refrigerant selected from R1234yf, R1234ze, and R290. Using these refrigerants is expected to improve performance by improving distribution of mixed refrigerants and low-boiling-point refrigerants, which are prone to performance degradation in the heat exchanger 30. Low-boiling-point refrigerants have low vapor density and high flow velocities, which increase the impact of inertial forces, thereby significantly improving the refrigerant distribution performance.
  • the refrigerant is a single refrigerant selected from R1234yf, R1234ze, and R290.
  • Embodiment 8 The eighth embodiment will be described below, but explanations of parts that overlap with those of the first to seventh embodiments will be omitted, and parts that are the same as or equivalent to those of the first to seventh embodiments will be given the same reference numerals.
  • the refrigerant flowing through the refrigerant circuit 110 is a mixed refrigerant of two or more of R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, R459A, R474A, and R479A.
  • the refrigerant is a mixed refrigerant of two or more of R516A, R445A, R444A, R454C, R444B, R454A, R455A, R457A, R459B, R452B, R454B, R447B, R447A, R446A, R459A, R474A, and R479A.
  • Embodiment 9 The ninth embodiment will be described below, but explanations of parts that overlap with those of the first to eighth embodiments will be omitted, and parts that are the same as or equivalent to those of the first to eighth embodiments will be given the same reference numerals.
  • the refrigerant flowing through the refrigerant circuit 110 is a mixed refrigerant of two or more of R1234yf, R1234ze, and R290, or a mixed refrigerant of any of these with other refrigerants, a mixed refrigerant containing R1132(E), or a mixed refrigerant containing R1123.
  • the effect of improving the refrigerant distribution performance can be enhanced, as low-boiling point refrigerants have low vapor density and high flow rates, which increases the influence of inertial forces.
  • concentration variations occur due to poor distribution, so the effect of improving the refrigerant distribution performance can be enhanced.
  • the refrigerant is a mixed refrigerant of two or more of R1234yf, R1234ze, and R290, or a mixed refrigerant of any of these with another refrigerant, a mixed refrigerant containing R1132(E), or a mixed refrigerant containing R1123.
  • the low-boiling-point refrigerant has a low vapor density and a fast flow velocity, which increases the influence of inertial forces, thereby making it possible to significantly improve the refrigerant distribution performance. Furthermore, since poor distribution of mixed refrigerants causes concentration variations, the performance improvement achieved by improving the refrigerant distribution performance can be significantly improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un dispositif à cycle frigorifique qui comprend un circuit de fluide frigorigène dans lequel un compresseur, un dispositif de commutation de trajet d'écoulement, un premier échangeur de chaleur, un dispositif d'étranglement et un second échangeur de chaleur sont reliés par une tuyauterie de fluide frigorigène, et à travers lesquels circule un fluide frigorigène. Le premier échangeur de chaleur comprend : une pluralité de tubes plats disposés côte à côte dans la direction horizontale avec des intervalles entre eux et s'étendant dans la direction verticale, et à travers lesquels s'écoule le fluide frigorigène ; un collecteur supérieur qui est disposé au-dessus de la pluralité de tubes plats de telle sorte que des parties d'extrémité supérieure de la pluralité de tubes plats font chacune saillie dans le collecteur supérieur, et dans lequel est formé un orifice d'entrée de fluide frigorigène ; et un collecteur inférieur qui est disposé au-dessous de la pluralité de tubes plats et dans lequel est formé un orifice de sortie de fluide frigorigène. Le dispositif de commutation de trajet d'écoulement est conçu pour amener le fluide frigorigène à s'écouler dans l'orifice d'entrée de fluide frigorigène et amener le fluide frigorigène à s'écouler hors de l'orifice de sortie de fluide frigorigène lorsque le premier échangeur de chaleur fonctionne soit en tant qu'évaporateur soit en tant que condenseur.
PCT/JP2024/016035 2024-04-24 2024-04-24 Dispositif à cycle frigorifique Pending WO2025224869A1 (fr)

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PCT/JP2024/016035 WO2025224869A1 (fr) 2024-04-24 2024-04-24 Dispositif à cycle frigorifique

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Application Number Priority Date Filing Date Title
PCT/JP2024/016035 WO2025224869A1 (fr) 2024-04-24 2024-04-24 Dispositif à cycle frigorifique

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WO2025224869A1 true WO2025224869A1 (fr) 2025-10-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09196489A (ja) * 1996-01-19 1997-07-31 Fujitsu General Ltd 空気調和機の冷凍サイクル
JP2004251556A (ja) * 2003-02-20 2004-09-09 Matsushita Electric Ind Co Ltd 熱交換器
WO2018055741A1 (fr) * 2016-09-23 2018-03-29 三菱電機株式会社 Appareil à cycle de réfrigération
JP2023104291A (ja) * 2022-01-17 2023-07-28 株式会社デンソー 冷凍サイクル装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09196489A (ja) * 1996-01-19 1997-07-31 Fujitsu General Ltd 空気調和機の冷凍サイクル
JP2004251556A (ja) * 2003-02-20 2004-09-09 Matsushita Electric Ind Co Ltd 熱交換器
WO2018055741A1 (fr) * 2016-09-23 2018-03-29 三菱電機株式会社 Appareil à cycle de réfrigération
JP2023104291A (ja) * 2022-01-17 2023-07-28 株式会社デンソー 冷凍サイクル装置

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