WO2022162931A1 - 冷凍サイクル装置 - Google Patents
冷凍サイクル装置 Download PDFInfo
- Publication number
- WO2022162931A1 WO2022162931A1 PCT/JP2021/003497 JP2021003497W WO2022162931A1 WO 2022162931 A1 WO2022162931 A1 WO 2022162931A1 JP 2021003497 W JP2021003497 W JP 2021003497W WO 2022162931 A1 WO2022162931 A1 WO 2022162931A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat transfer
- heat exchanger
- transfer tubes
- refrigerant
- heat
- Prior art date
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 45
- 239000003507 refrigerant Substances 0.000 claims abstract description 125
- 238000010257 thawing Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 230000001681 protective effect Effects 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 description 15
- 238000001816 cooling Methods 0.000 description 14
- 239000000155 melt Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 238000005192 partition Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005219 brazing Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Images
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
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0315—Temperature sensors near the outdoor heat exchanger
Definitions
- the present disclosure relates to a refrigeration cycle device.
- Patent Literature 1 describes an air conditioner as such a refrigeration cycle device.
- the heat exchanger of the outdoor unit may have a plurality of heat transfer tubes arranged side by side in a predetermined direction.
- the control unit of the refrigeration cycle device defrosts, for example, when the temperature of the refrigerant flowing out from the inside of the plurality of heat transfer tubes reaches or exceeds a certain temperature. Defrosting operation is ended by judging that the defrosting has been completed.
- the temperature of the refrigerant flowing through the heat transfer tubes may vary. Even if the temperature of the refrigerant flowing out of the heat transfer tubes exceeds a certain The temperature of the coolant flowing inside the heat tube may be lower than the certain temperature.
- frost remains around the part of the heat transfer tubes.
- the defrosting operation is performed for a certain period of time even after the temperature of the refrigerant that has flowed out of the plurality of heat transfer tubes reaches or exceeds a certain temperature, it is possible to prevent frost from remaining.
- the execution time of the defrosting operation becomes long, and the problem arises that the time during which other operations of the refrigeration cycle apparatus cannot be executed becomes long.
- one object of the present disclosure is to provide a refrigeration cycle device that can suppress the lengthening of the defrosting operation execution time.
- One aspect of the refrigeration cycle device of the present disclosure is a refrigeration cycle device including an outdoor unit having a heat exchanger, wherein a temperature detection device attached to the heat exchanger and a temperature obtained by the temperature detection device and a control unit that causes the refrigeration cycle device to perform a defrosting operation for removing frost generated in the heat exchanger based on A heat exchanger main body having a heat transfer tube, and a first opening and a second opening connected to the heat exchanger main body, and during the defrosting operation, inside the plurality of heat transfer tubes, the first The refrigerant that has flowed into the heat exchanger from one port flows into the heat exchanger, and the refrigerant that has flowed into the plurality of heat transfer tubes flows out of the heat exchanger from the second port,
- the first opening is located on the first side in the predetermined direction relative to the second opening
- the temperature detection device is attached to the end of the heat exchanger body on the second side in the predetermined direction
- the control unit terminates the defrosting operation when
- FIG. 1 is a schematic diagram showing a schematic configuration of a refrigeration cycle apparatus according to Embodiment 1.
- FIG. 1 is a perspective view showing a heat exchanger according to Embodiment 1;
- FIG. 3 is a cross-sectional view showing the heat exchanger according to Embodiment 1, and is a cross-sectional view taken along the line III-III in FIG. 2;
- FIG. 7 is a cross-sectional view showing a heat exchanger of an outdoor unit according to Embodiment 2;
- FIG. 1 is a schematic diagram showing a schematic configuration of a refrigeration cycle apparatus 100 according to Embodiment 1.
- the refrigerating cycle device 100 is a device that uses a refrigerating cycle in which a refrigerant 40 circulates.
- Refrigeration cycle device 100 in Embodiment 1 is an air conditioner.
- the refrigeration cycle device 100 includes an outdoor unit 10, an indoor unit 20, and a circulation path section 30.
- the outdoor unit 10 is arranged outdoors.
- the indoor unit 20 is arranged indoors.
- the outdoor unit 10 and the indoor unit 20 are connected to each other by a circulation path section 30 through which the refrigerant 40 circulates.
- the refrigeration cycle device 100 can adjust the temperature of the indoor air by exchanging heat between the refrigerant 40 flowing through the circulation path portion 30 and the indoor air in which the indoor unit 20 is arranged.
- the refrigerant 40 for example, a fluorine-based refrigerant or a hydrocarbon-based refrigerant having a low global warming potential (GWP) can be used.
- GWP global warming potential
- the outdoor unit 10 has an outdoor unit housing 11, a compressor 12, a heat exchanger 13, a flow control valve 14, a blower fan 15, a four-way valve 16, and a controller 17.
- a compressor 12 , a heat exchanger 13 , a flow control valve 14 , a blower fan 15 , a four-way valve 16 , and a controller 17 are accommodated inside the outdoor unit housing 11 .
- the compressor 12 , the heat exchanger 13 , the flow control valve 14 and the four-way valve 16 are provided in a portion of the circulation path section 30 located inside the outdoor unit housing 11 .
- Compressor 12 , heat exchanger 13 , flow control valve 14 , and four-way valve 16 are connected by a portion of circulation path section 30 located inside outdoor unit housing 11 .
- the compressor 12 compresses the low-pressure refrigerant 40 that has flowed into the compressor 12 into high-pressure refrigerant 40 .
- Compressor 12 may have any structure as long as it can compress refrigerant 40 .
- the compressor 12 is, for example, a capacity-controllable inverter compressor.
- the refrigerant 40 circulates in the circulation path portion 30 by driving the compressor 12 .
- FIG. 2 is a perspective view showing the heat exchanger 13 according to Embodiment 1.
- FIG. FIG. 3 is a cross-sectional view showing heat exchanger 13 according to the first embodiment, taken along line III--III in FIG. 2 and 3 show an X-axis, a Y-axis orthogonal to the X-axis, and a Z-axis orthogonal to both the X-axis and the Y-axis.
- a direction parallel to the X-axis is the front-rear direction of the outdoor unit 10 .
- a direction parallel to the Y-axis is the lateral direction of the outdoor unit 10 .
- the direction parallel to the Z-axis is the vertical direction.
- the direction parallel to the X-axis is called “front-back direction X”
- the direction parallel to the Y-axis is called “left-right direction Y”
- the direction parallel to the Z-axis is called “vertical direction Z”.
- the front-back direction X, the left-right direction Y, and the vertical direction Z are directions orthogonal to each other.
- the side (+X side) in the front-rear direction X to which the arrow of the X-axis points is the front side.
- the side (-X side) opposite to the side to which the arrow of the X-axis faces in the front-rear direction X is the rear side.
- the side (+Y side) of the horizontal direction Y to which the Y-axis arrow points is the left side.
- the opposite side (-Y side) of the horizontal direction Y to which the Y-axis arrow is directed is the right side.
- the side of the vertical direction Z to which the Z-axis arrow points (+Z side) is the upper side.
- the opposite side ( ⁇ Z side) of the vertical direction Z to which the arrow of the Z axis points is the lower side.
- the vertical direction Z corresponds to the "predetermined direction”
- the upper side corresponds to the "first side”
- the lower side corresponds to the "second side”.
- the heat exchanger 13 includes a heat exchanger body 50, a first collecting pipe 51, a second collecting pipe 52, a first mouth 53, and a second mouth .
- the heat exchanger main body 50 is a part where heat is exchanged between the refrigerant 40 and air.
- the heat exchanger 13 can exchange heat between the refrigerant 40 flowing inside the heat exchanger body 50 and the air passing through the heat exchanger body 50 .
- the heat exchanger body 50 has a plurality of heat transfer tubes 55, first heat transfer fins 56, protective members 57 and 58, and second heat transfer fins 59a and 59b.
- the refrigerant 40 flows inside the plurality of heat transfer tubes 55 .
- the plurality of heat transfer tubes 55 are arranged side by side in the vertical direction Z. As shown in FIG.
- the plurality of heat transfer tubes 55 are arranged along the vertical direction Z at regular intervals.
- the heat transfer tube 55 is a tubular member extending in the left-right direction Y.
- a material forming the heat transfer tube 55 is, for example, aluminum or an aluminum alloy.
- the heat transfer tubes 55 are open on both sides in the left-right direction Y.
- the dimension of the heat transfer tube 55 in the vertical direction Z is smaller than the dimension of the heat transfer tube 55 in the front-rear direction X.
- the heat transfer tubes 55 are flat tubes.
- the multiple heat transfer tubes 55 include multiple first heat transfer tubes 55a and multiple second heat transfer tubes 55b.
- the multiple second heat transfer tubes 55b are located below the multiple first heat transfer tubes 55a.
- the plurality of second heat transfer tubes 55b are arranged adjacent to and below the plurality of first heat transfer tubes 55a.
- four first heat transfer tubes 55a and four second heat transfer tubes 55b are provided.
- a total of eight heat transfer tubes 55 are provided, including four first heat transfer tubes 55a and four second heat transfer tubes 55b.
- the uppermost heat transfer tube 55 among the plurality of heat transfer tubes 55 is the first heat transfer tube 55a.
- the lowest heat transfer tube 55 among the plurality of heat transfer tubes 55 is the second heat transfer tube 55b.
- the direction of flow of the refrigerant 40 inside each of the first heat transfer tubes 55a is the same.
- the direction of flow of the refrigerant 40 inside each of the second heat transfer tubes 55b is the same as each other.
- the direction of flow of the refrigerant 40 inside the second heat transfer tube 55b is opposite to the direction of flow of the refrigerant 40 inside the first heat transfer tube 55a.
- the first heat transfer fins 56 are provided between the heat transfer tubes 55 adjacent to each other in the vertical direction Z. That is, seven first heat transfer fins 56 are provided in the first embodiment. Each first heat transfer fin 56 connects heat transfer tubes 55 adjacent to each other in the vertical direction Z. As shown in FIG. Both ends of the first heat transfer fins 56 in the vertical direction Z are fixed to heat transfer tubes 55 adjacent to each other in the vertical direction Z by, for example, brazing.
- the plurality of heat transfer tubes 55 are connected to each other by the plurality of first heat transfer fins 56 .
- the first heat transfer fins 56 are corrugated fins extending along the lateral direction Y in which the heat transfer tubes 55 extend.
- the first heat transfer fin 56 has a wave shape extending in the left-right direction Y when viewed in the front-rear direction X. As shown in FIG.
- the dimension in the left-right direction Y of the first heat transfer fins 56 is slightly smaller than the dimension in the left-right direction Y of the heat transfer tube 55 .
- a material forming the first heat transfer fins 56 is, for example, aluminum or an aluminum alloy.
- the protective members 57 and 58 are arranged on both sides of the plurality of heat transfer tubes 55 in the vertical direction Z, respectively.
- the protective member 57 is arranged side by side above the plurality of heat transfer tubes 55 .
- the protection member 58 is arranged side by side under the plurality of heat transfer tubes 55 .
- the upper surface of the protective member 57 is the upper surface of the heat exchanger body 50 .
- the protective member 57 constitutes the upper end of the heat exchanger body 50 .
- the lower surface of the protective member 58 is the lower surface of the heat exchanger body 50 .
- the protective member 58 constitutes the lower end of the heat exchanger body 50 .
- the protective members 57 and 58 are tubular members extending in the same direction as the heat transfer tube 55, that is, in the horizontal direction Y.
- the protection members 57 and 58 are open on both sides in the left-right direction Y.
- the shape of the protection members 57 and 58 in a cross section perpendicular to the lateral direction Y in which the protection members 57 and 58 extend is the same as the shape of the heat transfer tube 55 in a cross section perpendicular to the lateral direction Y in which the heat transfer tube 55 extends.
- the dimension of the protection members 57 and 58 in the vertical direction Z is smaller than the dimension of the protection members 57 and 58 in the front-rear direction X.
- protective members 57 and 58 are flat tubes having the same cross-sectional shape as heat transfer tube 55 .
- the dimension of the protection members 57 and 58 in the left-right direction Y is slightly smaller than the dimension of the heat transfer tube 55 in the left-right direction Y.
- the second heat transfer fins 59a are positioned between the protective member 57 and the uppermost heat transfer tube 55 among the plurality of heat transfer tubes 55 in the vertical direction Z.
- the second heat transfer fins 59a connect the protective member 57 and the uppermost heat transfer tube 55 .
- the second heat transfer fins 59a connect the protective member 57 and the first heat transfer tube 55a located at the uppermost side among the plurality of first heat transfer tubes 55a.
- the second heat transfer fins 59a are fixed to the protective member 57 and the heat transfer tubes 55 by, for example, brazing.
- the second heat transfer fins 59b are positioned between the protective member 58 and the lowermost heat transfer tube 55 among the plurality of heat transfer tubes 55 in the vertical direction Z.
- the second heat transfer fins 59b connect the protective member 58 and the heat transfer tube 55 positioned at the bottom.
- the second heat transfer fins 59b connect the protective member 58 and the second heat transfer tube 55b located on the lowest side among the plurality of second heat transfer tubes 55b.
- the second heat transfer fins 59b are fixed to the protective member 58 and the heat transfer tubes 55 by, for example, brazing.
- the shape of the second heat transfer fins 59a, 59b is the same as the shape of the first heat transfer fin 56. That is, the second heat transfer fins 59a and 59b are corrugated fins extending along the horizontal direction Y along which the protection members 57 and 58 and the heat transfer tubes 55 extend.
- the second heat transfer fins 59a and 59b have a wave shape extending in the left-right direction Y when viewed in the front-rear direction X. As shown in FIG.
- the lateral Y dimension of the second heat transfer fins 59 a and 59 b is slightly smaller than the lateral Y dimension of the heat transfer tube 55 and substantially the same as the lateral Y dimension of the protective members 57 and 58 .
- the dimension of the second heat transfer fins 59 a and 59 b in the left-right direction Y is the same as the dimension of the first heat transfer fin 56 in the left-right direction Y.
- a material forming the second heat transfer fins 59a and 59b is, for example, aluminum or an aluminum alloy.
- the first collecting pipe 51 is a tubular member extending in the vertical direction Z.
- the first collecting pipe 51 is substantially cylindrical. Both ends of the first collecting pipe 51 in the vertical direction Z are closed.
- the first collecting pipe 51 is located on the right side ( ⁇ Y side) of the heat exchanger body 50 .
- the first collecting pipe 51 protrudes to both sides in the vertical direction Z from the heat exchanger main body 50 . That is, the upper end of the heat exchanger main body 50 is positioned below the upper end of the first collecting pipe 51 .
- the lower end of the heat exchanger body 50 is located above the lower end of the first collecting pipe 51 .
- One end of a plurality of heat transfer tubes 55 is connected to the first collecting tube 51 .
- the right ( ⁇ Y side) end portions of the plurality of heat transfer tubes 55 are connected to the left (+Y side) wall portion of the first collecting pipe 51 .
- the first collecting pipe 51 has a first connection portion 51a, a second connection portion 51b, and a partition wall portion 51c.
- the first connecting portion 51 a is the upper portion of the first collecting pipe 51 .
- the second connecting portion 51b is a lower portion of the first collecting pipe 51.
- Right end portions of the plurality of first heat transfer tubes 55a are connected to the first connection portion 51a.
- Right ends of the plurality of second heat transfer tubes 55b are connected to the second connection portion 51b.
- the internal space S1 of the first connection portion 51a and the internal space S2 of the second connection portion 51b are partitioned in the vertical direction Z by the partition wall portion 51c.
- the partition wall portion 51c divides the internal space of the first collecting pipe 51 into two, the internal space S1 and the internal space S2, in the vertical direction Z.
- the internal space S1 is a portion of the interior of the first collecting pipe 51 located above the partition wall portion 51c.
- the internal space S2 is a portion of the interior of the first collecting pipe 51 located below the partition wall portion 51c.
- the right ( ⁇ Y side) ends of the plurality of heat transfer tubes 55 are open inside the first collecting tube 51 . More specifically, the right end portions of the plurality of first heat transfer tubes 55a are open to the internal space S1 of the first connection portion 51a. Right ends of the plurality of second heat transfer tubes 55b are open to the internal space S2 of the second connection portion 51b.
- the second collecting pipe 52 is a tubular member extending in the vertical direction Z.
- the second collecting pipe 52 is substantially cylindrical. Both ends of the second collecting pipe 52 in the vertical direction Z are closed.
- the second collecting pipe 52 is located on the left side (+Y side) of the heat exchanger body 50 .
- the second collecting pipe 52 protrudes to both sides in the vertical direction Z from the heat exchanger main body 50 . That is, the upper end of the heat exchanger main body 50 is positioned below the upper end of the second collecting pipe 52 .
- the lower end of the heat exchanger main body 50 is located above the lower end of the second collecting pipe 52 .
- the position in the vertical direction Z at the upper end of the second collecting pipe 52 is the same as the position in the vertical direction Z at the upper end of the first collecting pipe 51 .
- the position in the vertical direction Z at the lower end of the second collecting pipe 52 is the same as the position in the vertical direction Z at the lower end of the first collecting pipe 51 .
- the other ends of a plurality of heat transfer tubes 55 are connected to the second collection tube 52 .
- the left (+Y side) end portions of the plurality of heat transfer tubes 55 are connected to the right ( ⁇ Y side) wall portion of the second collecting pipe 52 .
- the inside of the second collecting pipe 52 is not partitioned in the vertical direction Z in the first embodiment.
- the left end portions of the plurality of heat transfer tubes 55 are open inside the second collection tube 52 .
- the left end portions of the plurality of first heat transfer tubes 55 a and the left end portions of the plurality of second heat transfer tubes 55 b are open inside the second collecting pipe 52 .
- the internal space S1 of the first connection portion 51a and the internal space S2 of the second connection portion 51b are divided into the interiors of the plurality of first heat transfer tubes 55a and the interiors of the second collecting pipe 52 and the plurality of second heat transfer tubes 55b. are connected to each other through
- the first opening 53 and the second opening 54 are tubular members extending in the left-right direction Y.
- the first opening 53 and the second opening 54 are connected to the wall on the right side ( ⁇ Y side) of the first collecting pipe 51 .
- the first opening 53 is located above the second opening 54 in the vertical direction Z. As shown in FIG.
- the left (+Y side) end of the first opening 53 opens into the internal space S1 of the first connecting portion 51a.
- the inside of the first mouth portion 53 is connected to the inside of the plurality of first heat transfer tubes 55a via the internal space S1 of the first connection portion 51a. That is, the first connection portion 51 a connects the inside of the plurality of first heat transfer tubes 55 a and the inside of the first mouth portion 53 .
- the left (+Y side) end of the second opening 54 opens into the internal space S2 of the second connecting portion 51b.
- the inside of the second mouth portion 54 is connected to the inside of the plurality of second heat transfer tubes 55b via the internal space S2 of the second connection portion 51b. That is, the second connecting portion 51b connects the inside of the plurality of second heat transfer tubes 55b and the inside of the second mouth portion 54 .
- the first opening 53 and the second opening 54 are connected to the heat exchanger main body 50 via the first collecting pipe 51 .
- the first mouth portion 53 is connected to the four-way valve 16 by part of the circulation path portion 30 .
- the second mouth portion 54 is connected to the flow control valve 14 by a part of the circulation path portion 30 .
- the flow rate adjustment valve 14 can adjust the flow rate of the refrigerant 40 flowing inside the circulation path section 30 .
- the flow control valve 14 is an expansion valve that reduces the pressure of the refrigerant 40 flowing inside the circulation path portion 30 .
- the flow regulating valve 14 adjusts the flow rate of the refrigerant 40 and the pressure of the refrigerant 40 by adjusting the degree of opening thereof by the control unit 17, for example.
- the degree of opening of the flow regulating valve 14 is adjusted according to the operating conditions of the indoor unit 20, for example.
- the blower fan 15 generates a flow of air that passes through the heat exchanger 13 and sends the air heat-exchanged with the refrigerant 40 to the outside of the outdoor unit 10 .
- the blower fan 15 draws outdoor air into the outdoor unit housing 11 from the rear side ( ⁇ X side) of the outdoor unit housing 11 .
- the air sucked into the outdoor unit housing 11 passes through the heat exchanger main body 50 from the rear side to the front side (+X side), and exchanges heat with the refrigerant 40 at that time.
- the blower fan 15 sends the air after heat exchange to the outside of the outdoor unit 10 from an air outlet (not shown).
- Blower fan 15 may be any type of fan. Blower fan 15 is, for example, a propeller fan.
- the four-way valve 16 is provided in a portion of the circulation path section 30 that is connected to the discharge side of the compressor 12 .
- the four-way valve 16 can reverse the direction of the coolant 40 flowing through the circulation path section 30 by switching a part of the circulation path section 30 .
- the path connected by the four-way valve 16 is the path indicated by the solid line in the four-way valve 16 in FIG. 1
- the refrigerant 40 flows in the circulation path section 30 in the direction indicated by the solid arrow in FIG.
- the path connected by the four-way valve 16 is the path indicated by the dashed line in the four-way valve 16 in FIG. 1
- the refrigerant 40 flows in the circulation path section 30 in the direction indicated by the dashed arrow in FIG.
- the control unit 17 controls each part of the outdoor unit 10.
- the control unit 17 is, for example, a system control unit that controls the entire refrigeration cycle apparatus 100 .
- the control unit 17 causes the refrigeration cycle device 100 to perform a defrosting operation for removing frost generated in the heat exchanger 13 based on the temperature acquired by the temperature detection device 60, which will be described later. The defrosting operation will be detailed later.
- the indoor unit 20 is capable of a cooling operation for cooling the air in the room in which the indoor unit 20 is arranged and a heating operation for warming the air in the room in which the indoor unit 20 is arranged.
- the indoor unit 20 has an indoor unit housing 21 , a heat exchanger 22 and a blower fan 23 .
- a heat exchanger 22 and a blower fan 23 are accommodated inside the indoor unit housing 21 .
- the indoor unit housing 21 has an air outlet and a suction port that open into the room in which the indoor unit 20 is arranged.
- the heat exchanger 22 is provided in a portion of the circulation path section 30 located inside the indoor unit housing 21 .
- the heat exchanger 22 exchanges heat between the refrigerant 40 flowing inside the circulation path portion 30 and the indoor air drawn into the indoor unit housing 21 .
- the heat exchanger 22 may have any structure as long as it can exchange heat between the refrigerant 40 and the room air.
- the structure of the heat exchanger 22 may be the same as the structure of the heat exchanger 13 of the outdoor unit 10 or may be different from the structure of the heat exchanger 13 .
- the blower fan 23 sucks indoor air into the indoor unit housing 21 through an air inlet (not shown) provided in the indoor unit housing 21 .
- the air sucked into the indoor unit housing 21 passes through the heat exchanger 22 and exchanges heat with the refrigerant 40 at that time.
- the blower fan 23 sends the air after heat exchange to the outside of the indoor unit 20 from an air outlet (not shown) provided in the indoor unit housing 21 .
- Blower fan 23 may be any type of blower.
- the blower fan 23 may be of the same type as the blower fan 15 of the outdoor unit 10 or may be of a different type from the blower fan 15 .
- the blower fan 23 is, for example, a cross-flow fan.
- the refrigerant 40 flowing through the circulation path portion 30 flows in the direction indicated by the solid line arrow in FIG. That is, when the indoor unit 20 is in a cooling operation, the refrigerant 40 flowing through the circulation path portion 30 flows through the compressor 12, the heat exchanger 13 of the outdoor unit 10, the flow control valve 14, and the heat exchanger 22 of the indoor unit 20. in that order back to the compressor 12 .
- the refrigerant 40 compressed by the compressor 12 into a high-temperature, high-pressure gas flows into the heat exchanger 13 of the outdoor unit 10 .
- the refrigerant 40 that has flowed into the heat exchanger 13 exchanges heat with the air sucked into the outdoor unit housing 11 by the blower fan 15 .
- the heat of the refrigerant 40 is released to the air inside the outdoor unit housing 11, and the refrigerant 40 condenses into a liquid.
- the refrigerant 40 liquefied in the heat exchanger 13 flows into the heat exchanger 22 of the indoor unit 20 . While flowing from heat exchanger 13 to heat exchanger 22, refrigerant 40 is decompressed by flow control valve 14, which is an expansion valve.
- the refrigerant 40 that has flowed into the heat exchanger 22 exchanges heat with the air inside the indoor unit 20 .
- the refrigerant 40 takes heat from the air sucked into the indoor unit housing 21 by the blower fan 23 and evaporates.
- the air that has been cooled by the refrigerant 40 is discharged into the room from an air outlet (not shown) by the blower fan 23 . Thereby, indoor air can be cooled.
- the refrigerant 40 that has evaporated in the heat exchanger 22 and becomes a low-temperature, low-pressure gas passes through the four-way valve 16 and flows into the compressor 12 of the outdoor unit 10 .
- the refrigerant 40 is compressed in the compressor 12 and becomes a high-temperature, high-pressure gas again.
- the refrigerant 40 that has become a high-temperature, high-pressure gas flows into the heat exchanger 13 of the outdoor unit 10 again.
- the heat exchanger 13 inside the outdoor unit 10 functions as a condenser
- the heat exchanger 22 inside the indoor unit 20 functions as an evaporator.
- the refrigerant 40 flowing through the circulation path portion 30 flows in the direction indicated by the dashed line in FIG.
- the refrigerant 40 flowing through the circulation path portion 30 flows through the compressor 12, the heat exchanger 22 of the indoor unit 20, the flow control valve 14, and the heat exchanger 13 of the outdoor unit 10. in that order back to the compressor 12 .
- the high-temperature and high-pressure gaseous refrigerant 40 compressed by the compressor 12 in the outdoor unit 10 flows into the heat exchanger 22 of the indoor unit 20 .
- the refrigerant 40 that has flowed into the heat exchanger 22 is heat-exchanged in the heat exchanger 22 with the air sucked into the indoor unit housing 21 by the blower fan 23 .
- the heat of the refrigerant 40 is released to the air inside the indoor unit housing 21, and the refrigerant 40 condenses into a liquid.
- the air warmed by releasing the heat of the refrigerant 40 is discharged into the room from an air outlet (not shown) by the blower fan 23 . As a result, warm air is released into the room, and the air in the room can be warmed.
- the refrigerant 40 liquefied in the heat exchanger 22 flows into the heat exchanger 13 of the outdoor unit 10 . While flowing from heat exchanger 22 to heat exchanger 13, refrigerant 40 is decompressed by flow control valve 14, which is an expansion valve. The refrigerant 40 that has flowed into the heat exchanger 13 exchanges heat with the air inside the outdoor unit 10 . In the heat exchanger 13, the refrigerant 40 takes heat from the air sucked into the outdoor unit housing 11 by the blower fan 15 and evaporates. The air in the outdoor unit housing 11 from which heat has been removed by the refrigerant 40 is discharged to the outside of the room from an air outlet (not shown) by the blower fan 15 .
- the refrigerant 40 that has evaporated in the heat exchanger 13 and has become a low-temperature, low-pressure gas is compressed in the compressor 12 to become a high-temperature, high-pressure gas again.
- the refrigerant 40 that has become a high-temperature, high-pressure gas flows into the heat exchanger 22 of the indoor unit 20 again.
- the heat exchanger 13 inside the outdoor unit 10 functions as an evaporator
- the heat exchanger 22 inside the indoor unit 20 functions as a condenser.
- the refrigeration cycle device 100 further includes a temperature detection device 60 attached to the heat exchanger 13 of the outdoor unit 10.
- the temperature detection device 60 may be any type of temperature detection device as long as it can detect the temperature of the portion of the heat exchanger 13 to which the temperature detection device 60 is attached.
- the temperature detection device 60 is, for example, a thermistor.
- the temperature detection device 60 is attached to the lower end of the heat exchanger body 50 .
- the temperature detection device 60 is attached to the right ( ⁇ Y side) end of the lower surface of the protective member 58 .
- the temperature detection device 60 is attached to the end of the heat exchanger main body 50 on the lower side that is closer to the second opening 54 .
- a defrosting operation is performed to remove frost generated in the heat exchanger 13 .
- the refrigerant 40 flowing through the plurality of heat transfer tubes 55 in the heat exchanger 13 of the outdoor unit 10 functioning as an evaporator takes heat from the air contacting the heat exchanger main body 50 . Therefore, the temperature of the heat exchanger main body 50 decreases during the heating operation.
- the moisture in the air contacting the heat exchanger body 50 reaches the dew point temperature. It reaches and condenses and adheres to the surface of the heat exchanger body 50 .
- the surface of the heat exchanger body 50 includes the surface of the heat transfer tube 55, the surface of the first heat transfer fin 56, the surface of the second heat transfer fins 59a and 59b, and the surfaces of the protective members 57 and 58. including.
- frost When frost accumulates on the surface of the heat exchanger body 50 , the frost fills the space between the heat transfer tubes 55 and between the heat transfer tubes 55 and the protective members 57 and 58 , making it difficult for air to pass through the heat exchanger body 50 . . Therefore, the heat exchange efficiency between the refrigerant 40 flowing through the plurality of heat transfer tubes 55 and the air may decrease, and the heating capacity in the heating operation may decrease. Therefore, when the heating operation is to be continued for a certain period of time, it is necessary to periodically perform the defrosting operation, which is the reverse cycle of the heating operation, to remove the frost formed on the heat exchanger 13 .
- the direction of flow of the refrigerant 40 within the circulation path portion 30 is the same as the direction of flow of the refrigerant 40 within the circulation path portion 30 during the cooling operation.
- the heat exchanger 13 inside the outdoor unit 10 functions as a condenser
- the heat exchanger 22 inside the indoor unit 20 functions as an evaporator, as in the cooling operation.
- the direction of flow of refrigerant 40 indicated by an arrow is the direction of flow of refrigerant 40 when defrosting operation or cooling operation is being performed. As shown in FIG.
- the refrigerant 40 that has flowed into the internal space S1 of the first collecting pipe 51 from the first opening 53 flows into the plurality of first It flows into the heat transfer tube 55a from the right side (-Y side).
- the refrigerant 40 that has flowed into the plurality of first heat transfer pipes 55 a flows leftward (+Y side) inside each first heat transfer pipe 55 a and flows into the second collecting pipe 52 . That is, the refrigerant 40 flowing inside the plurality of first heat transfer tubes 55 a joins inside the second collecting tube 52 .
- the refrigerant 40 that has flowed into the second collecting pipe 52 flows into the plurality of second heat transfer pipes 55b from the left side (+Y side).
- the refrigerant 40 flows into the plurality of second heat transfer tubes 55b after flowing through the plurality of first heat transfer tubes 55a.
- the refrigerant 40 that has flowed into the plurality of second heat transfer tubes 55b flows to the right side ( ⁇ Y side) inside each second heat transfer tube 55b and flows into the internal space S2 of the first collecting tube 51 . That is, the refrigerant 40 flowing inside the plurality of second heat transfer tubes 55b joins in the internal space S2.
- the refrigerant 40 that has flowed into the internal space S2 flows out of the heat exchanger 13 through the second port 54 .
- the refrigerant 40 that has flowed into the heat exchanger 13 from the first opening 53 flows into the plurality of heat transfer tubes 55, and the plurality of heat transfer tubes 55
- the refrigerant 40 that has flowed into the heat pipe 55 flows out of the heat exchanger 13 through the second port 54 .
- the direction in which the refrigerant 40 flows inside the heat exchanger 13 is opposite to that during the defrosting operation and the cooling operation.
- the refrigerant 40 that has flowed into the heat exchanger 13 from the second port 54 flows into the plurality of heat transfer tubes 55, and the refrigerant that has flowed into the plurality of heat transfer tubes 55 40 flows out of the heat exchanger 13 from the first opening 53 .
- the refrigerant 40 flows as in the defrosting operation and the cooling operation described above, the refrigerant 40 having a relatively high temperature flows into the plurality of heat transfer tubes 55 in the heat exchanger 13, and flows through the plurality of heat transfer tubes 55.
- the flowing refrigerant 40 gives up heat to the air contacting the heat exchanger body 50 . Therefore, by flowing the refrigerant 40 in the same direction as during the cooling operation during the defrosting operation, the heat released from the refrigerant 40 flowing inside the plurality of heat transfer tubes 55 causes heat to occur on the surface of the heat exchanger body 50. Frost can be melted and removed.
- the control unit 17 causes the refrigeration cycle device 100 to perform defrosting operation based on the temperature acquired by the temperature detection device 60 . Specifically, for example, when the temperature detected by the temperature detection device 60 remains lower than the first temperature for a predetermined period of time or longer, the control unit 17 causes frost to form on the surface of the heat exchanger body 50. refrigerating cycle device 100 to perform a defrosting operation.
- the first temperature is, for example, a temperature within the range of -5°C or higher and 0°C or lower.
- the control unit 17 determines that all the frost generated on the surface of the heat exchanger main body 50 has been removed.
- the defrosting operation is terminated by judging.
- the second temperature is, for example, a temperature within the range of 5°C or higher and 10°C or lower. It should be noted that the second temperature corresponds to the "predetermined temperature" in the first embodiment.
- the refrigerant 40 flowing inside the plurality of heat transfer tubes 55 releases heat and melts the frost, so the temperature decreases while flowing from the first opening 53 to the second opening 54 .
- the control unit 17 detects the temperature of the heat exchanger 13 on the downstream side in the flow direction of the refrigerant 40 in the heat exchanger 13, that is, on the side close to the second port 54 by the temperature detection device 60, thereby detecting frost. can determine whether there are any remaining
- the refrigerant 40 flows into the plurality of first heat transfer tubes 55a positioned above before the plurality of second heat transfer tubes 55b positioned below. Therefore, when the defrosting operation is started, the surface of the plurality of first heat transfer tubes 55a, the surface of the first heat transfer fins 56 connected to the plurality of first heat transfer tubes 55a, the surface of the second heat transfer fins 59a, and the protective member 57 The frost adhering to the surface of the surface melts first.
- the refrigerant 40 having a relatively high temperature also flows into the plurality of second heat transfer tubes 55b.
- the surface of the first heat transfer fins 56 connected to the plurality of second heat transfer tubes 55b, the surface of the second heat transfer fins 59b, and the surface of the protective member 58 are also melted sequentially.
- the frost adhering to the surfaces of the plurality of second heat transfer tubes 55b and the like melts in order from the upper side near the first heat transfer tubes 55a where the surface frost has already melted and the temperature is relatively high.
- the frost formed on the surface of the heat exchanger body 50 tends to remain on the lower end portion of the heat exchanger body 50 to the end. That is, in the heat exchanger body 50 having a plurality of heat transfer tubes 55 arranged side by side in a predetermined direction (vertical direction Z), the first opening 53 into which the refrigerant 40 flows during the defrosting operation in the predetermined direction Frost tends to remain until the end on the side (lower side) where the second opening 54 through which the refrigerant 40 flows out is located during the defrosting operation.
- the detected temperature is the temperature based on the temperature of the refrigerant 40 that joins from inside the plurality of second heat transfer tubes 55b.
- the temperature of the refrigerant 40 flowing inside the second heat transfer tube 55b located on the upper side is relatively high, and the temperature of the refrigerant flowing inside the second heat transfer tube 55b located on the lower side becomes relatively high.
- the temperature of 40 will be relatively low.
- the temperature of the merged refrigerant 40 may become relatively high due to the refrigerant 40 flowing inside the second heat transfer pipe 55b positioned above. Therefore, the defrosting operation may be terminated when the detected temperature becomes equal to or higher than the second temperature before the frost formed on the surface of the second heat transfer pipe 55b located on the lower side is removed. In this case, frost continues to accumulate on the surface of the second heat transfer tube 55b located on the lower side, and the accumulated frost may crush and damage the second heat transfer tube 55b.
- the defrosting operation is performed for a while even if the detected temperature becomes equal to or higher than the second temperature, remaining frost can be suppressed.
- the defrosting operation execution time tends to become longer than necessary, and the time during which the heating operation cannot be executed becomes longer. Therefore, convenience for the user who uses the refrigeration cycle device 100 is reduced.
- the blower fan 23 in the indoor unit 20 is stopped so as not to send low-temperature air into the room. Therefore, the refrigerant 40 does not vaporize in the heat exchanger 22 of the indoor unit 20 , and the refrigerant 40 in a liquid state flows into the compressor 12 .
- the compression amount of the refrigerant 40 in the compressor 12 increases, and there is a possibility that the compressor 12 may be damaged.
- the concentration of lubricating oil in the compressor 12 may decrease, and seizing may occur in sliding portions in the compressor 12 .
- the temperature detection device 60 is arranged at the lower end of the heat exchanger body 50 , that is, on the side where the second opening 54 is located with respect to the first opening 53 . attached to the end of the Therefore, the temperature detection device 60 can detect the temperature of a portion of the heat exchanger body 50 where the refrigerant 40 flowing through the plurality of heat transfer tubes 55 is not joined, where frost tends to remain. Thereby, based on the temperature acquired by the temperature detection device 60, the control unit 17 can suitably determine that all the frost has been removed. Therefore, it is possible to prevent frost from remaining when the defrosting operation ends. Therefore, it is possible to suppress the continued accumulation of frost on the lower portion of the heat exchanger body 50 .
- the defrosting operation can be easily ended at a suitable timing after all the frost is removed, it is possible to suppress the lengthening of the execution time of the defrosting operation. As a result, it is possible to suppress the lengthening of the time during which the heating operation cannot be performed, and it is possible to suppress the decrease in convenience for the user using the refrigeration cycle device 100 . In addition, it is possible to suppress an increase in the amount of compression of the refrigerant 40 in the compressor 12 and to suppress damage to the compressor 12 . In addition, it is possible to suppress a decrease in the concentration of the lubricating oil in the compressor 12, and it is possible to suppress the occurrence of seizure in the sliding portion in the compressor 12.
- the temperature detection device 60 is attached to the end of the heat exchanger main body 50 on the side closer to the second opening 54 in the lower end.
- a portion of the heat exchanger body 50 that is closer to the second opening 54 is located downstream in the flow of the refrigerant 40 during the defrosting operation, so that the temperature rises and the frost melts slowly. Therefore, by attaching the temperature detection device 60 to the end of the heat exchanger body 50 that is closer to the second opening 54 in the lower end of the heat exchanger body 50 , the temperature detection device 60 detects It can detect the temperature of the part where frost is more likely to remain. Thus, by ending the defrosting operation based on the temperature detected by the temperature detection device 60, it is possible to further suppress the remaining frost and further suppress the lengthening of the execution time of the defrosting operation.
- the heat exchanger body 50 has the first heat transfer fins 56 that connect the heat transfer tubes 55 adjacent to each other in the vertical direction Z.
- the first heat transfer fins 56 are corrugated fins extending along the horizontal direction Y in which the heat transfer tubes 55 extend. Therefore, the heat exchange efficiency in the heat exchanger main body 50 can be improved by the first heat transfer fins 56 . Further, when such first heat transfer fins 56 are provided, the first heat transfer fins 56 interfere with each other, making it difficult to dispose the temperature detection device 60 between the heat transfer tubes 55 .
- the temperature detection device 60 is attached to the lower end of the heat exchanger main body 50 . Therefore, the temperature detection device 60 can be arranged without interfering with the first heat transfer fins 56 . Further, there is no need to perform processing such as drilling holes in the first heat transfer fins 56 in order to attach the temperature detection device 60 .
- the dimension of the heat transfer tube 55 in the vertical direction Z is smaller than the dimension of the heat transfer tube 55 in the front-rear direction X orthogonal to both the left-right direction Y and the vertical direction Z in which the heat transfer tube 55 extends.
- the heat transfer tubes 55 are such flat tubes, a configuration in which the first collecting pipe 51 and the second collecting pipe 52 are provided and the plurality of heat transfer pipes 55 are connected to each other as in the first embodiment is likely to be adopted. .
- the temperature detection device 60 is attached to the lower end of the heat exchanger body 50 as described above, all frost can be removed based on the temperature before the refrigerant 40 joins. Therefore, it is possible to appropriately determine the timing.
- the effect obtained by the structure in which the temperature detection device 60 is attached to the lower end of the heat exchanger main body 50 is more likely to be obtained effectively in the heat exchanger 13 in which the heat transfer tubes 55 are flat tubes.
- the heat exchanger 13 includes the first connection portion 51a that connects the inside of the plurality of first heat transfer tubes 55a and the inside of the first mouth portion 53, and the plurality of second heat transfer tubes 55b. and a second connecting portion 51 b that connects the inside of and the inside of the second mouth portion 54 .
- the refrigerant 40 flows into the multiple second heat transfer tubes 55b after flowing through the multiple first heat transfer tubes 55a. Therefore, as described above, the frost on the surfaces of the second heat transfer tubes 55b tends to melt more slowly than the frost on the surfaces of the first heat transfer tubes 55a.
- the further the second heat transfer tubes 55b are from the first heat transfer tubes 55a, the slower the frost adhering to the surface thereof melts. Therefore, by attaching the temperature detection device 60 to the lower end of the heat exchanger body 50, it is possible to detect the temperature near the second heat transfer tube 55b where frost is most likely to remain. As a result, by ending the defrosting operation based on the temperature detected by the temperature detection device 60, it is possible to more preferably suppress the lengthening of the execution time of the defrosting operation while further suppressing the remaining frost. .
- the heat exchanger 13 includes the first collecting pipe 51 to which one end of the plurality of heat transfer tubes 55 is connected, and the second collecting pipe 51 to which the other end of the plurality of heat transfer tubes 55 is connected. and a collecting pipe 52 .
- the first collecting pipe 51 has a first connection portion 51a and a second connection portion 51b. Therefore, the plurality of first heat transfer pipes 55a and the plurality of second heat transfer pipes 55b are preferably connected by the first heat transfer pipes 51 and the second heat transfer pipes 52, and the refrigerant 40 is suitably made to flow through the heat transfer pipes 55. be able to.
- first connecting portion 51a and the second connecting portion 51b in the first collecting pipe 51, it is possible to arrange the first opening 53 and the second opening 54 on the same side in the left-right direction Y. can. Therefore, the work of connecting the pipes to the first opening 53 and the second opening 54 of the heat exchanger 13 can be easily performed.
- the heat exchanger body 50 includes the protective member 58 arranged side by side under the plurality of heat transfer tubes 55, and the second heat transfer member connecting the protective member 58 and the heat transfer tube 55. and fins 59b.
- a temperature detection device 60 is attached to the lower surface of the protection member 58 .
- Embodiment 1 since the protective member 58 is positioned above the lower end of the first collecting pipe 51 and the lower end of the second collecting pipe 52, a direct impact is less likely to be applied to the protective member 58 from below. , damage to the heat transfer tubes 55 can be further suppressed.
- the second heat transfer fins 59b are provided, the temperature of the protection member 58 tends to be close to the temperature of the heat transfer tube 55 located on the lowest side among the plurality of heat transfer tubes 55 . As a result, even if the protection member 58 is provided with the temperature detection device 60, it is possible to suitably determine the timing at which all the frost has been removed.
- the temperature of the protection member 58 tends to be lower than the temperature of the heat transfer tube 55 located on the lowest side. Therefore, by ending the defrosting operation when the temperature of the protective member 58 reaches the second temperature or higher, it is possible to more preferably prevent frost from remaining on the surfaces of the heat transfer tubes 55 and the like.
- the protective member 58 is a tubular member.
- the shape of the protection member 58 in a cross section orthogonal to the lateral direction Y in which the protection member 58 extends is the same as the shape of the heat transfer tube 55 in a cross section orthogonal to the lateral direction Y in which the heat transfer tube 55 extends. Therefore, the protective member 58 can be made using a tubular member similar to the tubular member forming the heat transfer tube 55 . Thereby, the protective member 58 can be easily manufactured, and the manufacturing cost of the heat exchanger 13 can be reduced.
- the predetermined direction in which the plurality of heat transfer tubes 55 are arranged is the vertical direction Z.
- the first side in the predetermined direction is the upper side in the vertical direction Z.
- the second side in the predetermined direction is the bottom side in the vertical direction Z.
- FIG. When a plurality of heat transfer tubes 55 are arranged in the vertical direction Z in this way, when frost melts on the surface of the upper heat transfer tubes 55 and the like to become water, the water flows downward due to gravity and is positioned on the lower side. Frost on the surface of the heat transfer tube 55 or the like is applied. Therefore, the frost formed on the surface of the heat exchanger body 50 tends to melt in order from the upper side to the lower side.
- the frost formed on the surface of the heat exchanger body 50 tends to remain on the lower end of the heat exchanger body 50 to the end. Accordingly, by attaching the temperature detection device 60 to the lower end of the heat exchanger main body 50 and detecting the temperature, it is possible to more preferably determine the timing when all the frost has been removed. Therefore, it is possible to further suppress the defrosting operation from becoming longer while suppressing remaining frost.
- the heat exchanger main body 50 includes the protective members 57 arranged side by side on the upper side of the plurality of heat transfer tubes 55, and the second heat transfer fins connecting the protective members 57 and the heat transfer tubes 55. 59a and .
- the protection member 57 can protect the plurality of heat transfer tubes 55 from above. Therefore, even if the heat exchanger main body 50 is subjected to an impact or the like from above, damage to the heat transfer tubes 55 can be suppressed.
- the protective member 57 is positioned below the upper end portion of the first collecting pipe 51 and the upper end portion of the second collecting pipe 52, it is difficult to apply a direct impact to the protective member 57 from above. , damage to the heat transfer tubes 55 can be further suppressed.
- the protective member 57 is a tubular member.
- the shape of the protection member 57 in a cross section orthogonal to the horizontal direction Y in which the protection member 57 extends is the same as the shape of the heat transfer tube 55 in a cross section orthogonal to the horizontal direction Y in which the heat transfer tube 55 extends. Therefore, like the protective member 58, the protective member 57 can be easily manufactured, and the manufacturing cost of the heat exchanger 13 can be reduced.
- FIG. 4 is a cross-sectional view showing heat exchanger 213 of outdoor unit 210 according to the second embodiment.
- the heat exchanger 213 of the second embodiment differs from the heat exchanger 13 of the first embodiment in that a heat transfer tube 55 is provided instead of the protection members 57 and 58. is different.
- the same configurations as those of the first embodiment described above may be omitted by appropriately assigning the same reference numerals.
- the heat exchanger main body 250 has a total of ten heat transfer tubes 55, including five first heat transfer tubes 55a and five second heat transfer tubes 55b.
- the heat transfer tubes 55 are connected to each other by first heat transfer fins 56 .
- first heat transfer tubes 55a are provided in place of the protection members 57 in the first embodiment
- second heat transfer tubes 55b are provided in place of the protection members 58 in the second embodiment.
- the temperature detection device 260 is attached to the lowermost heat transfer tube 55 among the plurality of heat transfer tubes 55 . More specifically, the temperature detection device 260 is attached to the right ( ⁇ Y side) end of the lower surface of the lowermost second heat transfer tube 55b.
- Other configurations of heat exchanger 213 are the same as other configurations of heat exchanger 13 of the first embodiment.
- Other configurations of the outdoor unit 210 are the same as the other configurations of the outdoor unit 10 of the first embodiment.
- the temperature detection device 260 is attached to the heat transfer tube 55 located on the lowest side among the plurality of heat transfer tubes 55 . Therefore, the temperature detected by the temperature detection device 260 can be suitably approximated to the temperature of the refrigerant 40 flowing inside the heat transfer tube 55 located at the lowest side. Thereby, the control unit 17 can more appropriately determine the timing when all the frost has been removed based on the temperature detected by the temperature detection device 260 . Therefore, it is possible to more preferably suppress the lengthening of the defrosting operation execution time.
- the temperature detection device may be installed at any position as long as it is at the end of the second side (lower side) of the heat exchanger body.
- the temperature detection device may be attached to the central portion in the left-right direction Y at the lower end of the heat exchanger body 50, such as the temperature detection device 160 indicated by a two-dot chain line in FIG.
- a plurality of temperature detection devices may be provided.
- the temperature detection device may be attached to a member other than the heat transfer tube and the protection member as long as it is the end portion on the second side of the heat exchanger body.
- the predetermined direction in which the plurality of heat transfer tubes are arranged is not particularly limited.
- the predetermined direction may be a direction intersecting the vertical direction.
- the number of heat transfer tubes is not particularly limited as long as it is two or more.
- the shape of the heat transfer tube is not particularly limited.
- the heat transfer tube may be a cylindrical tube member.
- the refrigerant may flow in any way through the plurality of heat transfer tubes while flowing from the first opening to the second opening during the defrosting operation.
- the plurality of heat transfer tubes may include a third heat transfer tube positioned between the plurality of first heat transfer tubes and the plurality of second heat transfer tubes in a predetermined direction (vertical direction Z).
- the refrigerant may flow through the plurality of first heat transfer tubes, then flow through the plurality of third heat transfer tubes, and after flowing through the plurality of third heat transfer tubes, flow through the plurality of second heat transfer tubes. .
- the refrigerant 40 flows between the first collecting pipe 51 and the second collecting pipe before flowing from the first opening 53 to the second opening .
- the inside of the first collecting pipe 51 and the inside of the second collecting pipe 52 are provided with partition wall portions 51c and the like. A partition wall is provided.
- the first mouth and the second mouth may be arranged in any way.
- the first opening may be provided on one of the first collecting pipe and the second collecting pipe, and the second opening may be provided on the other of the first collecting pipe and the second collecting pipe.
- the type of the first heat transfer fins and the type of the second heat transfer fins are not particularly limited.
- the shape of the first heat transfer fins and the shape of the second heat transfer fins are not particularly limited.
- the shape of the protective member is not particularly limited.
- the protective member may be a solid columnar member.
- the control unit may be provided anywhere in the refrigeration cycle device.
- the controller may be provided in the indoor unit, or may be provided in a portion of the refrigeration cycle device other than the outdoor unit and the indoor unit.
- the refrigeration cycle device is not limited to an air conditioner as long as it uses a refrigeration cycle in which a refrigerant circulates.
- the refrigeration cycle device may be a heat pump water heater or the like. As described above, each configuration and each method described in this specification can be appropriately combined as long as they do not contradict each other.
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Abstract
Description
図1は、実施の形態1における冷凍サイクル装置100の概略構成を示す模式図である。冷凍サイクル装置100は、冷媒40が循環する冷凍サイクルを利用する装置である。実施の形態1において冷凍サイクル装置100は、空気調和装置である。図1に示すように、冷凍サイクル装置100は、室外機10と、室内機20と、循環経路部30と、を備える。室外機10は、室外に配置されている。室内機20は、室内に配置されている。室外機10と室内機20とは、冷媒40が循環する循環経路部30によって互いに接続されている。
図4は、実施の形態2における室外機210の熱交換器213を示す断面図である。図4に示すように、実施の形態2の熱交換器213は、上述した実施の形態1の熱交換器13に対して、保護部材57,58の代わりに伝熱管55が設けられている点が異なる。なお、以下の実施の形態2の説明において、上述した実施の形態1と同様の構成については、適宜同一の符号を付すなどにより、説明を省略する場合がある。
Claims (10)
- 熱交換器を有する室外機を備える冷凍サイクル装置であって、
前記熱交換器に取り付けられた温度検出装置と、
前記温度検出装置によって取得された温度に基づいて、前記熱交換器に生じた霜を取り除くための除霜運転を前記冷凍サイクル装置に実行させる制御部と、
を備え、
前記熱交換器は、
所定方向に並んで配置された複数の伝熱管を有する熱交換器本体と、
前記熱交換器本体に繋がる第1口部および第2口部と、
を有し、
前記除霜運転時において、前記複数の伝熱管の内部には前記第1口部から前記熱交換器の内部に流入した冷媒が流入し、かつ、前記複数の伝熱管の内部に流入した前記冷媒は前記第2口部から前記熱交換器の外部に流出し、
前記第1口部は、前記第2口部よりも前記所定方向の第1側に位置し、
前記温度検出装置は、前記熱交換器本体における前記所定方向の第2側の端部に取り付けられ、
前記除霜運転時において前記制御部は、前記温度検出装置によって取得された温度が所定温度以上となった場合に前記除霜運転を終了させる、冷凍サイクル装置。 - 前記温度検出装置は、前記熱交換器本体における前記第2側の端部のうち前記第2口部に近い側の端部に取り付けられている、請求項1に記載の冷凍サイクル装置。
- 前記熱交換器本体は、前記所定方向に隣り合う前記伝熱管同士を繋ぐ第1伝熱フィンを有し、
前記第1伝熱フィンは、前記伝熱管が延びる方向に沿って延びるコルゲートフィンである、請求項1または2に記載の冷凍サイクル装置。 - 前記所定方向における前記伝熱管の寸法は、前記伝熱管が延びる方向および前記所定方向の両方と直交する方向における前記伝熱管の寸法よりも小さい、請求項1から3のいずれか一項に記載の冷凍サイクル装置。
- 前記複数の伝熱管は、
複数の第1伝熱管と、
前記複数の第1伝熱管よりも前記第2側に位置する複数の第2伝熱管と、
を含み、
前記熱交換器は、
前記複数の第1伝熱管の内部と前記第1口部の内部とを繋ぐ第1接続部と、
前記複数の第2伝熱管の内部と前記第2口部の内部とを繋ぐ第2接続部と、
を有し、
前記除霜運転時において、前記複数の第2伝熱管の内部には、前記複数の第1伝熱管の内部を流れた後の前記冷媒が流入する、請求項1から4のいずれか一項に記載の冷凍サイクル装置。 - 前記熱交換器は、
前記複数の伝熱管の一端部が接続された第1集合管と、
前記複数の伝熱管の他端部が接続された第2集合管と、
を有し、
前記第1集合管は、前記第1接続部と、前記第2接続部と、を有する、請求項5に記載の冷凍サイクル装置。 - 前記熱交換器本体は、
前記複数の伝熱管の前記第2側に並んで配置された保護部材と、
前記保護部材と前記伝熱管とを繋ぐ第2伝熱フィンと、
を有し、
前記温度検出装置は、前記保護部材の前記第2側の面に取り付けられている、請求項1から6のいずれか一項に記載の冷凍サイクル装置。 - 前記保護部材は、管状の部材であり、
前記保護部材が延びる方向と直交する断面における前記保護部材の形状は、前記伝熱管が延びる方向と直交する断面における前記伝熱管の形状と同じである、請求項7に記載の冷凍サイクル装置。 - 前記温度検出装置は、前記複数の伝熱管のうち最も前記第2側に位置する伝熱管に取り付けられている、請求項1から6のいずれか一項に記載の冷凍サイクル装置。
- 前記所定方向は、鉛直方向であり、
前記第1側は、鉛直方向の上側であり、
前記第2側は、鉛直方向の下側である、請求項1から9のいずれか一項に記載の冷凍サイクル装置。
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PCT/JP2021/003497 WO2022162931A1 (ja) | 2021-02-01 | 2021-02-01 | 冷凍サイクル装置 |
DE112021006979.9T DE112021006979T5 (de) | 2021-02-01 | 2021-02-01 | Kältekreislaufgerät |
JP2022577998A JP7493630B2 (ja) | 2021-02-01 | 2021-02-01 | 冷凍サイクル装置 |
CN202180080392.5A CN116670448A (zh) | 2021-02-01 | 2021-02-01 | 制冷循环装置 |
US18/247,968 US20230375239A1 (en) | 2021-02-01 | 2021-02-01 | Refrigeration cycle device |
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JPH0875326A (ja) * | 1994-09-05 | 1996-03-19 | Sanyo Electric Co Ltd | 着霜検知方法 |
JP2005257139A (ja) * | 2004-03-10 | 2005-09-22 | Denso Corp | 空調装置 |
JP2012102927A (ja) * | 2010-11-09 | 2012-05-31 | Daikin Industries Ltd | 空調システム |
JP2013061120A (ja) * | 2011-09-14 | 2013-04-04 | Sharp Corp | 蒸発器及びそれを備えた冷蔵庫 |
JP2018194294A (ja) * | 2018-08-10 | 2018-12-06 | 三菱電機株式会社 | 冷凍サイクル装置 |
JP2019015410A (ja) * | 2017-07-03 | 2019-01-31 | ダイキン工業株式会社 | 熱交換器 |
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CN110749226B (zh) | 2019-11-28 | 2024-08-16 | 兰州理工大学 | 一种内置活动式换热器的固-液相变储热装置及使用方法 |
CN211373301U (zh) | 2020-01-06 | 2020-08-28 | 江西蓝星星火有机硅有限公司 | 一种换热器 |
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- 2021-02-01 WO PCT/JP2021/003497 patent/WO2022162931A1/ja active Application Filing
- 2021-02-01 CN CN202180080392.5A patent/CN116670448A/zh active Pending
- 2021-02-01 US US18/247,968 patent/US20230375239A1/en active Pending
- 2021-02-01 JP JP2022577998A patent/JP7493630B2/ja active Active
Patent Citations (6)
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JPH0875326A (ja) * | 1994-09-05 | 1996-03-19 | Sanyo Electric Co Ltd | 着霜検知方法 |
JP2005257139A (ja) * | 2004-03-10 | 2005-09-22 | Denso Corp | 空調装置 |
JP2012102927A (ja) * | 2010-11-09 | 2012-05-31 | Daikin Industries Ltd | 空調システム |
JP2013061120A (ja) * | 2011-09-14 | 2013-04-04 | Sharp Corp | 蒸発器及びそれを備えた冷蔵庫 |
JP2019015410A (ja) * | 2017-07-03 | 2019-01-31 | ダイキン工業株式会社 | 熱交換器 |
JP2018194294A (ja) * | 2018-08-10 | 2018-12-06 | 三菱電機株式会社 | 冷凍サイクル装置 |
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DE112021006979T5 (de) | 2023-11-16 |
JPWO2022162931A1 (ja) | 2022-08-04 |
JP7493630B2 (ja) | 2024-05-31 |
CN116670448A (zh) | 2023-08-29 |
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