US20230332806A1 - Heat exchanger and refrigeration cycle apparatus including the same - Google Patents

Heat exchanger and refrigeration cycle apparatus including the same Download PDF

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Publication number
US20230332806A1
US20230332806A1 US18/044,272 US202018044272A US2023332806A1 US 20230332806 A1 US20230332806 A1 US 20230332806A1 US 202018044272 A US202018044272 A US 202018044272A US 2023332806 A1 US2023332806 A1 US 2023332806A1
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United States
Prior art keywords
heat exchange
exchange module
transfer tubes
heat
heat transfer
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Pending
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US18/044,272
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English (en)
Inventor
Atsushi Morita
Tsuyoshi Maeda
Akira YATSUYANAGI
Akira Ishibashi
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIBASHI, AKIRA, MORITA, ATSUSHI, MAEDA, TSUYOSHI, YATSUYANAGI, Akira
Publication of US20230332806A1 publication Critical patent/US20230332806A1/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F28D1/0443—Combination of units extending one beside or one above the other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0224—Header boxes formed by sealing end plates into covers
    • 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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing

Definitions

  • the present disclosure relates to a heat exchanger and a refrigeration cycle apparatus including the same.
  • a heat exchanger that adopts a fin-less structure in which no fins are disposed in heat transfer tubes.
  • this type of heat exchanger it is necessary to dispose more heat transfer tubes in order to ensure a heat transfer area. It is necessary to narrow the pitch for disposing the heat transfer tubes in order to accommodate the heat transfer tubes within a limited volume.
  • PTL 1 proposes a heat exchanger including a plurality of heat transfer tubes and an auxiliary member attached to the heat transfer tubes for maintaining the pitch of the heat transfer tubes.
  • the present disclosure has been made in order to solve such a problem, and one object thereof is to provide a heat exchanger that reduces variations in the amounts of refrigerants flowing through heat transfer tubes, and another object thereof is to provide a refrigeration cycle apparatus to which such a heat exchanger is applied.
  • a heat exchanger in accordance with the present disclosure is a heat exchanger including a plurality of heat exchange modules, the plurality of heat exchange modules each including a plurality of heat transfer tubes and a securing connector that holds the plurality of heat transfer tubes, the plurality of heat exchange modules being connected together by the securing connector of each of the plurality of heat exchange modules.
  • the securing connector includes a holder plate and a pair of side plates. The holder plate holds the plurality of heat transfer tubes that are disposed to be spaced from each other, the plurality of heat transfer tubes each having one end inserted through the holder plate.
  • the pair of side plates extends from the holder plate away from the heat transfer tubes, the pair of side plates extending along the one end of each of the plurality of heat transfer tubes, the one end being located between the side plates.
  • the plurality of heat exchange modules include a first heat exchange module and a second heat exchange module.
  • the first heat exchange module the plurality of heat transfer tubes are disposed in a first direction to be spaced from each other.
  • the second heat exchange module the plurality of heat transfer tubes are disposed in the first direction to be spaced from each other, the second heat exchange module being connected to the first heat exchange module in a second direction crossing the first direction.
  • the holder plate of the securing connector in the first heat exchange module is spaced from and faces the holder plate of the securing connector in the second heat exchange module.
  • the pair of side plates of the securing connector in the first heat exchange module is joined to the pair of side plates of the securing connector in the second heat exchange module.
  • the securing connector in the first heat exchange module and the securing connector in the second heat exchange module define a space, and the plurality of heat transfer tubes in the first heat exchange module and the plurality of heat transfer tubes in the second heat exchange module communicate with the space and face each other.
  • a refrigeration cycle apparatus in accordance with the present disclosure is a refrigeration cycle apparatus including the heat exchanger described above.
  • the heat exchanger in accordance with the present disclosure, in the space defined by the securing connectors connecting the first heat exchange module and the second heat exchange module, refrigerants that have flowed through the plurality of heat transfer tubes are mixed. Thereby, even when there are variations in the amounts of the refrigerants distributed to the heat transfer tubes after flowing into the heat exchanger, the refrigerants are mixed in that space, and thereby the amounts of the refrigerants flowing through the heat transfer tubes are equalized. As a result, the heat exchanger can have an improved heat transfer performance.
  • the refrigeration cycle apparatus in accordance with the present disclosure includes the heat exchanger described above. This can contribute to an improved heat transfer performance as a refrigeration cycle apparatus.
  • FIG. 1 is a view showing a refrigerant circuit of a refrigeration cycle apparatus including an outdoor heat exchanger in accordance with each embodiment.
  • FIG. 2 is a front view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with a first embodiment.
  • FIG. 3 is an exploded perspective view showing an assembly structure of the heat exchange modules in the same embodiment.
  • FIG. 4 is a partial perspective view showing a heat exchange module including fins as a variation in the same embodiment.
  • FIG. 5 is a partial perspective view showing a structure of a heat exchange module in an outdoor heat exchanger in accordance with a second embodiment.
  • FIG. 6 is a partial perspective view showing a structure of a heat exchange module in an outdoor heat exchanger in accordance with a third embodiment.
  • FIG. 7 is a partial perspective view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with a fourth embodiment.
  • FIG. 8 is a first partial perspective view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with a fifth embodiment.
  • FIG. 9 is a second partial perspective view showing a structure of the heat exchange modules in the outdoor heat exchanger in the same embodiment.
  • FIG. 10 is a partial perspective view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with a sixth embodiment.
  • FIG. 11 is a partial front view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with a seventh embodiment.
  • FIG. 12 is a first front view showing a structure of heat exchange modules in an outdoor heat exchanger in accordance with an eighth embodiment.
  • FIG. 13 is a second front view showing a structure of the heat exchange modules in the outdoor heat exchanger in the same embodiment.
  • a refrigeration cycle apparatus 1 includes a compressor 3 , an indoor heat exchanger 5 , a fan 7 , an expansion valve 9 , an outdoor heat exchanger 11 , a propeller fan 13 , a four-way valve 15 , and a refrigerant pipe 17 connecting these elements.
  • the structure of outdoor heat exchanger 11 will be described in detail in each embodiment.
  • indoor heat exchanger 5 heat exchange is performed between the gas refrigerant that has flowed therein and air fed therein by fan 7 .
  • the high-temperature and high-pressure gas refrigerant condenses into high-pressure liquid refrigerant (single phase).
  • the heat exchanged air is fed into a room from indoor heat exchanger 5 , to heat the interior of the room.
  • the high-pressure liquid refrigerant fed from indoor heat exchanger 5 is turned into two-phase refrigerant including low-pressure gas refrigerant and liquid refrigerant by expansion valve 9 .
  • the two-phase refrigerant flows into outdoor heat exchanger 11 .
  • Outdoor heat exchanger 11 functions as an evaporator. In outdoor heat exchanger 11 , heat exchange is performed between the two-phase refrigerant that has flowed therein and air supplied by propeller fan 13 . In the two-phase refrigerant, the liquid refrigerant evaporates into low-pressure gas refrigerant (single phase), which is fed from outdoor heat exchanger 11 .
  • the refrigerant flows into a second header 43 located at the bottom of outdoor heat exchanger 11 , flows through heat transfer tubes 23 , and thereafter is fed from a first header 41 located at the top of outdoor heat exchanger 11 (see FIG. 2 ).
  • the low-pressure gas refrigerant fed from outdoor heat exchanger 11 flows into compressor 3 through four-way valve 15 .
  • the low-pressure gas refrigerant that has flowed into compressor 3 is compressed into high-temperature and high-pressure gas refrigerant, which is discharged from compressor 3 again. This cycle is subsequently repeated.
  • a cooling operation will be described next.
  • Broken lines indicate the flow of refrigerant in the case of the cooling operation.
  • high-temperature and high-pressure gas refrigerant is discharged from compressor 3 .
  • the discharged high-temperature and high-pressure gas refrigerant (single phase) flows into outdoor heat exchanger 11 through four-way valve 15 .
  • Outdoor heat exchanger 11 functions as a condenser. In outdoor heat exchanger 11 , heat exchange is performed between the refrigerant that has flowed therein and air supplied by propeller fan 13 .
  • the high-temperature and high-pressure gas refrigerant condenses into high-pressure liquid refrigerant (single phase).
  • the refrigerant flows into first header 41 located at the top of outdoor heat exchanger 11 , flows through heat transfer tubes 23 , and thereafter is fed from second header 43 located at the bottom of outdoor heat exchanger 11 (see FIG. 2 ).
  • the high-pressure liquid refrigerant fed from outdoor heat exchanger 11 is turned into two-phase refrigerant including low-pressure gas refrigerant and liquid refrigerant by expansion valve 9 .
  • the two-phase refrigerant flows into indoor heat exchanger 5 .
  • indoor heat exchanger 5 heat exchange is performed between the two-phase refrigerant that has flowed therein and air fed into indoor heat exchanger 5 by fan 7 .
  • the liquid refrigerant evaporates into low-pressure gas refrigerant (single phase).
  • the heat exchanged air is fed into the room from indoor heat exchanger 5 , to cool the interior of the room.
  • the low-pressure gas refrigerant fed from indoor heat exchanger 5 flows into compressor 3 through four-way valve 15 .
  • the low-pressure gas refrigerant that has flowed into compressor 3 is compressed into high-temperature and high-pressure gas refrigerant, which is discharged from compressor 3 again. This cycle is subsequently repeated.
  • Outdoor heat exchanger 11 applied to refrigeration cycle apparatus 1 described above includes a plurality of heat exchange modules connected with each other.
  • outdoor heat exchanger 11 in accordance with each embodiment will be specifically described.
  • the X axis direction is defined as a direction substantially perpendicular to an air flow direction.
  • the Y axis direction is defined as a direction substantially parallel to the air flow direction.
  • the Z axis direction is defined as a direction substantially parallel to a gravity direction.
  • outdoor heat exchanger 11 includes a plurality of heat exchange modules 21 , the plurality of heat exchange modules 21 each including a plurality of heat transfer tubes 23 and a securing connector 25 that holds the plurality of heat transfer tubes 23 , the plurality of heat exchange modules 21 being connected together by securing connector 25 of each of the plurality of heat exchange modules 21 .
  • First header 41 is connected to uppermost heat exchange module 21 of the plurality of heat exchange modules 21 .
  • Second header 43 is connected to lowermost heat exchange module 21 of the plurality of heat exchange modules 21 .
  • heat transfer tubes 23 of the plurality of heat exchange modules 21 are disposed substantially parallel to the Z axis direction. That is, heat transfer tubes 23 are disposed along the gravity direction. Further, in the plurality of heat exchange modules 21 , a fin-less structure in which no fins are disposed in heat transfer tubes 23 is adopted as an example.
  • Outdoor heat exchanger 11 has a first heat exchange module 21 a as one heat exchange module 21 , and a second heat exchange module 21 b as another heat exchange module 21 .
  • First heat exchange module 21 a and second heat exchange module 21 b are connected by securing connectors 25 ( 25 a ).
  • Securing connector 25 a linearly extends in one direction.
  • first heat exchange module 21 a and second heat exchange module 21 b the plurality of heat transfer tubes 23 disposed in the X axis direction to be spaced from each other are held by securing connector 25 a disposed at one end of each of heat transfer tubes 23 .
  • securing connector 25 a includes a holder plate 27 a and a pair of side plates 29 a.
  • insertion holes 28 a are formed, through each of which one end of each of the plurality of heat transfer tubes 23 is inserted, and each of which holds heat transfer tube 23 .
  • the pair of side plates 29 a extends from holder plate 27 a away from heat transfer tubes 23 .
  • the pair of side plates 29 a extends along the one end of each of the plurality of heat transfer tubes 23 , the one end being located between side plates 29 a disposed to be spaced in the Y axis direction.
  • first heat exchange module 21 a and second heat exchange module 21 b connected with each other holder plate 27 a in securing connector 25 a of first heat exchange module 21 a is spaced from and faces holder plate 27 a in securing connector 25 a of second heat exchange module 21 b.
  • the pair of side plates 29 a in securing connector 25 a of first heat exchange module 21 a is joined to the pair of side plates 29 a in securing connector 25 a of second heat exchange module 21 b .
  • the pair of side plates 29 a of first heat exchange module 21 a is joined to the pair of side plates 29 a of second heat exchange module 21 b by brazing, for example.
  • Securing connector 25 a of first heat exchange module 21 a and securing connector 25 a of second heat exchange module 21 b define a space (region), and heat transfer tubes 23 of first heat exchange module 21 a and heat transfer tubes 23 of second heat exchange module 21 b communicate with the space and face each other.
  • Securing connector 25 a is attached to the other end of each of heat transfer tubes 23 of first heat exchange module 21 a .
  • This securing connector 25 a is joined to first header 41 . It should be noted that the other end of each of heat transfer tubes 23 of first heat exchange module 21 a may be directly inserted into first header 41 with no securing connector 25 a being interposed therebetween.
  • Outdoor heat exchanger 11 in accordance with the first embodiment is configured as described above.
  • the flow of the refrigerant in outdoor heat exchanger 11 described above will be described.
  • the refrigerant that has been discharged from compressor 3 and flowed through indoor heat exchanger 5 flows into second header 43 located at the bottom of outdoor heat exchanger 11 through expansion valve 9 .
  • the refrigerant that has flowed into second header 43 flows through heat transfer tubes 23 along the (positive) Z axis direction, and flows into the space defined by securing connectors 25 connecting heat exchange modules 21 .
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into first header 41 located at the top of outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 is fed from outdoor heat exchanger 11 and flows into compressor 3 .
  • the refrigerant that has been discharged from compressor 3 flows into first header 41 located at the top of outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 flows through heat transfer tubes 23 along the (negative) Z axis direction, and flows into the space defined by securing connectors 25 connecting heat exchange modules 21 .
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into second header 43 located at the bottom of outdoor heat exchanger 11 .
  • the refrigerant that has flowed into second header 43 is fed from outdoor heat exchanger 11 and flows into compressor 3 through expansion valve 9 and indoor heat exchanger 5 .
  • the plurality of heat exchange modules 21 , first header 41 , and second header 43 constituting outdoor heat exchanger 11 are prepared. Then, the plurality of heat exchange modules 21 and the like are mechanically fastened using jigs, for example.
  • the plurality of heat exchange modules 21 and the like are joined by brazing, for example.
  • the pairs of side plates 29 a of securing connectors 25 that face each other in the Z axis direction are joined.
  • the pairs of side plates 29 a of securing connectors 25 that face each other in the X axis direction are joined, and holder plates 27 a thereof are joined.
  • Outdoor heat exchanger 11 described above includes the plurality of heat exchange modules 21 , the plurality of heat exchange modules 21 each including the plurality of heat transfer tubes 23 and securing connector 25 that holds the plurality of heat transfer tubes 23 , the plurality of heat exchange modules 21 being connected together by securing connector 25 of each of the plurality of heat exchange modules 21 .
  • First header 41 is connected to the top of heat exchange modules 21 .
  • Second header 43 is connected to the bottom of heat exchange modules 21 .
  • the plurality of heat transfer tubes 23 are held by securing connector 25 . This can prevent heat transfer tubes 23 from being curved due to thermal stress, an assembly error, or the like, for example, during the manufacturing of the heat exchanger.
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed. Thereby, even when there are variations in the amounts of the refrigerants distributed from first header 41 or second header 43 to heat transfer tubes 23 , the refrigerants are mixed in that space. By repeating this process, the amounts of the refrigerants flowing through heat transfer tubes 23 are equalized. As a result, outdoor heat exchanger 11 can have an improved heat transfer performance, when compared with a conventional heat exchanger.
  • Heat exchange module 21 is not limited to the one having the fin-less structure, and heat exchange module 21 may be the one in which fins are disposed.
  • FIG. 4 shows heat transfer tubes 23 in which plate-shaped fins 51 extending in the Z axis direction are disposed at both ends in the Y axis direction (on the positive side and the negative side) of flat-shaped heat transfer tubes 23 . Further, instead of such plate-shaped fins 51 , for example, corrugated fins (not shown) may be disposed in the heat transfer tubes.
  • draining grooves 33 are formed in securing connector 25 that connects one heat exchange module and another heat exchange module. Draining grooves 33 are formed from portions corresponding to ends in the (positive and negative) Y axis direction of each heat transfer tube inserted into holder plate 27 a , along the Y axis direction, toward sides on which side plates 29 a are located. Since the configuration other than that is the same as the configuration of outdoor heat exchanger 11 shown in FIG. 3 and the like, identical members will be designated by the same reference numerals, and the description thereof will not be repeated except when necessary.
  • outdoor heat exchanger 11 functions as an evaporator.
  • low-temperature two-phase refrigerant flows into second header 43 located at the bottom of outdoor heat exchanger 11 , flows through heat transfer tubes 23 , and thereafter is fed from first header 41 located at the top of outdoor heat exchanger 11 .
  • frost is likely to form on surfaces of heat transfer tubes 23 . If the frost builds up between adjacent heat transfer tubes 23 , heat exchange may not be performed sufficiently between the air fed by propeller fan 13 and the refrigerant flowing through heat transfer tubes 23 .
  • refrigeration cycle apparatus 1 performs a defrosting operation for melting the frost built up on heat transfer tubes 23 .
  • the high-temperature and high-pressure refrigerant discharged from compressor 3 is fed into outdoor heat exchanger 11 .
  • the frost built up on heat transfer tubes 23 melts into water droplets. The water droplets move on heat transfer tubes 23 , reach holder plate 27 a of securing connector 25 , flow through draining grooves 33 , and fall downward.
  • draining grooves 33 are formed in securing connector 25 that holds heat transfer tubes 23 and connects heat exchange modules 21 with each other. Thereby, the water droplets melting during the defrosting operation can fall downward from draining grooves 33 , and can be suppressed from remaining on heat transfer tubes 23 and the like. As a result, it is possible to suppress the water droplets remaining on heat transfer tubes 23 and the like from being frozen again after the heating operation is resumed, and damaging heat transfer tubes 23 and the like.
  • FIG. 6 A description will be given of one example of an outdoor heat exchanger in accordance with a third embodiment.
  • inclinations are provided in holder plate 27 a of securing connector 25 that connects one heat exchange module and another heat exchange module.
  • Each inclination is inclined downward in the Z axis direction (downward in the gravity direction). Since the configuration other than that is the same as the configuration of outdoor heat exchanger 11 shown in FIG. 3 and the like, identical members will be designated by the same reference numerals, and the description thereof will not be repeated except when necessary.
  • frost is likely to form on the surfaces of heat transfer tubes 23 . If the frost builds up between adjacent heat transfer tubes 23 , heat exchange may not be performed sufficiently between the air fed by propeller fan 13 and the refrigerant flowing through heat transfer tubes 23 .
  • refrigeration cycle apparatus 1 performs the defrosting operation for melting the frost built up on heat transfer tubes 23 .
  • the high-temperature and high-pressure refrigerant discharged from compressor 3 is fed into outdoor heat exchanger 11 .
  • the frost built up on heat transfer tubes 23 melts into water droplets. The water droplets move on heat transfer tubes 23 , flow along holder plate 27 a of securing connector 25 , and fall downward from the inclinations.
  • an outdoor heat exchanger that adopts a structure in which the heat exchanger is curved to ensure a heat transfer area within a limited installation area.
  • a description will be given of one example of an outdoor heat exchanger including securing connectors that can be applied to the portion of the curved heat exchanger.
  • outdoor heat exchanger 11 includes a third heat exchange module 21 c and a fourth heat exchange module 21 d that are each curved, as heat exchange modules 21 .
  • Third heat exchange module 21 c and fourth heat exchange module 21 d are connected by securing connectors 25 ( 25 b ).
  • Securing connectors 25 b are curved to correspond to curved third heat exchange module 21 c and fourth heat exchange module 21 d . It should be noted that, since the configuration other than that is the same as the configuration of the outdoor heat exchanger shown in FIG. 2 and the like, identical members will be designated by the same reference numerals, and the description thereof will not be repeated except when necessary.
  • the refrigerant that has flowed into second header 43 flows through heat transfer tubes 23 along the (positive) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 b ) connecting heat exchange modules 21 (see FIGS. 2 and 7 ).
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into first header 41 located at the top of outdoor heat exchanger 11 , and is fed from outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 flows through heat transfer tubes 23 along the (negative) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 b ) connecting heat exchange modules 21 (see FIGS. 2 and 7 ).
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into second header 43 located at the bottom of outdoor heat exchanger 11 , and is fed from outdoor heat exchanger 11 .
  • Outdoor heat exchanger 11 described above has third heat exchange module 21 c and fourth heat exchange module 21 d that are each curved, as heat exchange modules 21 . Curved third heat exchange module 21 c and curved fourth heat exchange module 21 d are connected by curved securing connectors 25 b.
  • the refrigerants that have flowed through heat transfer tubes 23 of third heat exchange module 21 c are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 of fourth heat exchange module 21 d (third heat exchange module 21 c ).
  • the plurality of heat transfer tubes 23 disposed in the X axis direction to be spaced from each other are disposed on a windward side and on a leeward side along the Y axis direction (air flow direction).
  • the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the windward side and the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the leeward side are set at the same positions.
  • One end of each of these heat transfer tubes 23 is held by securing connector 25 a.
  • the refrigerant that has flowed into second header 43 flows through heat transfer tubes 23 along the (positive) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 a ) connecting heat exchange modules 21 (see FIGS. 2 and 8 ).
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into first header 41 located at the top of outdoor heat exchanger 11 , and is fed from outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 flows through heat transfer tubes 23 along the (negative) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 a ) connecting heat exchange modules 21 (see FIGS. 2 and 8 ).
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into second header 43 located at the bottom of outdoor heat exchanger 11 , and is fed from outdoor heat exchanger 11 .
  • the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the windward side and the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the leeward side are set at the same positions.
  • the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the windward side may be offset from the positions in the X axis direction of the plurality of heat transfer tubes 23 disposed on the leeward side, as shown in FIG. 9 .
  • the pitch of the plurality of heat transfer tubes 23 disposed on the windward side may be offset by half a pitch, for example.
  • FIG. 10 A description will be given of one example of an outdoor heat exchanger in accordance with a sixth embodiment.
  • a pair of partition walls 31 a is provided in securing connector 25 ( 25 a ) that connects one heat exchange module (first heat exchange module 21 a ) and another heat exchange module (second heat exchange module 21 b ).
  • the pair of partition walls 31 a extends from holder plate 27 a away from heat transfer tubes 23 .
  • the pair of partition walls 31 a is disposed to face each other to be spaced in the X axis direction.
  • the pair of partition walls 31 a is disposed to connect between the pair of side plates 29 a .
  • the pair of partition walls 31 a in securing connector 25 a of first heat exchange module 21 a is joined to the pair of partition walls 31 a in securing connector 25 a of second heat exchange module 21 b.
  • the refrigerant that has flowed into second header 43 flows through heat transfer tubes 23 along the (positive) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 a ) connecting heat exchange modules 21 (see FIGS. 2 and 10 ).
  • the refrigerants that have flowed through heat transfer tubes 23 are mixed.
  • the mixed refrigerant flows through heat transfer tubes 23 again.
  • the refrigerant flows into first header 41 located at the top of outdoor heat exchanger 11 , and is fed from outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 flows through heat transfer tubes 23 along the (negative) Z axis direction, and flows into the space defined by securing connectors 25 ( 25 a ) connecting heat exchange modules 21 (see FIGS. 2 and 10 ).
  • securing connectors 25 ( 25 a ) joined to each other have an improved mechanical strength.
  • securing connectors 25 ( 25 a ) joined to each other have an improved mechanical strength, they can also have a resistance to external impact.
  • outdoor heat exchanger 11 has first heat exchange module 21 a and a fifth heat exchange module 21 e , as heat exchange modules 21 .
  • First heat exchange module 21 a and fifth heat exchange module 21 e are disposed along the X axis direction, and are joined to each other by securing connectors 25 .
  • An arrangement pitch of heat transfer tubes 23 in first heat exchange module 21 a is set to a pitch P 1 .
  • An arrangement pitch of heat transfer tubes 23 in fifth heat exchange module 21 e is set to pitch P 1 .
  • An arrangement pitch between first heat exchange module 21 a and fifth heat exchange module 21 e is set to a pitch P 2 larger than pitch P 1 . That is, pitch P 2 between heat exchange modules 21 is set to a value larger than that of pitch P 1 within each heat exchange module 21 .
  • the arrangement pitch between first heat exchange module 21 a and fifth heat exchange module 21 e corresponds to a spacing between heat transfer tube 23 closest to fifth heat exchange module 21 e , of the plurality of heat transfer tubes 23 in first heat exchange module 21 a , and heat transfer tube 23 closest to first heat exchange module 21 a , of the plurality of heat transfer tubes 23 in fifth heat exchange module 21 e.
  • the flow of the refrigerant in outdoor heat exchanger 11 described above will be briefly described.
  • the refrigerant that has flowed into second header 43 flows through heat transfer tubes 23 and the space defined by securing connectors 25 , flows into first header 41 , and is fed from outdoor heat exchanger 11 .
  • the refrigerant that has flowed into first header 41 flows through heat transfer tubes 23 and the space defined by securing connectors 25 , flows into second header 43 , and is fed from outdoor heat exchanger 11 .
  • first heat exchange module 21 a and fifth heat exchange module 21 e are mechanically fastened using jigs, for example.
  • first heat exchange module 21 a and fifth heat exchange module 21 e are disposed along the X axis direction and are mechanically fastened.
  • first heat exchange module 21 a and fifth heat exchange module 21 e the pair of side plates 29 a of securing connector 25 in first heat exchange module 21 a is joined to the pair of side plates 29 a of securing connector 25 in fifth heat exchange module 21 e .
  • holder plate 27 a of securing connector 25 in first heat exchange module 21 a is joined to holder plate 27 a of securing connector 25 in fifth heat exchange module 21 e .
  • pitch P 2 between heat exchange modules 21 is set to a value larger than that of pitch P 1 within each heat exchange module 21 .
  • outdoor heat exchanger 11 has the plurality of heat exchange modules 21 including first heat exchange module 21 a and second heat exchange module 21 b .
  • First heat exchange module 21 a and second heat exchange module 21 b are disposed along the Z axis direction, and are joined to each other by securing connectors 25 .
  • Second heat exchange module 21 b is disposed under first heat exchange module 21 a.
  • the arrangement pitch of heat transfer tubes 23 in first heat exchange module 21 a is set to pitch P 1 .
  • An arrangement pitch of heat transfer tubes 23 in second heat exchange module 21 b is set to a pitch P 3 .
  • Pitch P 3 is set to a value larger than that of pitch P 1 . That is, pitch P 3 in second heat exchange module 21 b disposed at a lower part of heat exchange modules 21 is larger than pitch P 1 in first heat exchange module 21 a disposed above second heat exchange module 21 b.
  • outdoor heat exchanger 11 functions as an evaporator.
  • the low-temperature two-phase refrigerant flows into second header 43 located at the bottom of outdoor heat exchanger 11 , flows through heat transfer tubes 23 , and thereafter is fed from first header 41 located at the top of outdoor heat exchanger 11 .
  • refrigeration cycle apparatus 1 performs the defrosting operation for melting the frost built up on heat transfer tubes 23 . In the heating operation, this defrosting operation is performed as appropriate.
  • the frost built up on heat transfer tubes 23 melts into water droplets, and the water droplets move on heat transfer tubes 23 and flow toward the lower part of heat exchange modules 21 .
  • the defrosting operation and the heating operation are repeated, it is conceivable that the water droplets that have flowed into the lower part of heat exchange modules 21 are frozen again when the heating operation is resumed after the defrosting operation.
  • pitch P 3 in second heat exchange module 21 b is set to a value larger than that of pitch P 1 in first heat exchange module 21 a .
  • outdoor heat exchanger 11 heat exchange is performed between the air fed into each heat exchange module by propeller fan 13 (see FIG. 1 ) and the refrigerant flowing through the heat transfer tubes of each heat exchange module.
  • the amount of air fed into each heat exchange module depends on the speed at which the air flows (wind speed). The wind speed decreases with distance from the rotation shaft of propeller fan 13 .
  • outdoor heat exchanger 11 in accordance with the variation has the plurality of heat exchange modules 21 including a sixth heat exchange module 21 f and a seventh heat exchange module 21 g .
  • An arrangement pitch of heat transfer tubes 23 in sixth heat exchange module 21 f is set to a pitch P 4 .
  • An arrangement pitch of heat transfer tubes 23 in seventh heat exchange module 21 g is set to a pitch P 5 .
  • Pitch P 4 is set to a value larger than that of pitch P 5 .
  • Sixth heat exchange module 21 f with a large arrangement pitch (pitch P 4 ) is disposed at a position (region) where a relatively small amount of air is fed therein, in the outdoor heat exchanger.
  • Seventh heat exchange module 21 g with a small arrangement pitch (pitch P 5 ) is disposed at a position (region) where a relatively large amount of air is fed therein, in the outdoor heat exchanger.
  • a region obtained by projecting a region in which propeller fan 13 (see FIG. 1 ) rotates onto heat exchange module 21 facing the propeller fan is indicated by a dotted-line frame FA.
  • the amount of air fed into the heat exchange module located inside dotted-line frame FA is larger than the amount of air fed into the heat exchange module located outside dotted-line frame FA.
  • Seventh heat exchange module 21 g is disposed inside dotted-line frame FA.
  • Sixth heat exchange module 21 f is disposed outside dotted-line frame FA.
  • sixth heat exchange module 21 f is disposed at portions of four corners in outdoor heat exchanger 11 .
  • seventh heat exchange module 21 g ( 21 ) into which a relatively large amount of air is fed air flow resistance increases, and the air is less likely to flow between heat transfer tubes 23 .
  • sixth heat exchange module 21 f ( 21 ) into which a relatively small amount of air is fed air flow resistance decreases, and the air is more likely to flow between heat transfer tubes 23 .
  • outdoor heat exchanger 11 can have an improved heat exchange amount.
  • each outdoor heat exchanger 11 heat transfer tubes 23 of each heat exchange module 21 are disposed substantially parallel to the gravity direction (vertical direction). Outdoor heat exchanger 11 is not limited thereto, and heat transfer tubes 23 of each heat exchange module 21 may be disposed to cross the gravity direction. For example, outdoor heat exchanger 11 may have heat transfer tubes 23 disposed in a horizontal direction.
  • the present disclosure is effectively utilized for a heat exchanger including a plurality of heat exchange modules having a plurality of heat transfer tubes disposed therein, the heat exchange modules each having a fin-less structure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
  • Other Air-Conditioning Systems (AREA)
US18/044,272 2020-11-06 2020-11-06 Heat exchanger and refrigeration cycle apparatus including the same Pending US20230332806A1 (en)

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JP2001355981A (ja) * 1993-11-08 2001-12-26 Sharp Corp 熱交換器
JP2002243381A (ja) * 2001-02-16 2002-08-28 Daikin Ind Ltd 空気熱交換器およびその製造方法
DE10112697A1 (de) * 2001-03-16 2002-09-19 Behr Gmbh & Co Wärmeübertrager, insbesondere für Kraftfahrzeuge
JP4786234B2 (ja) * 2004-07-05 2011-10-05 昭和電工株式会社 熱交換器
WO2006059498A1 (ja) * 2004-11-30 2006-06-08 Matsushita Electric Industrial Co., Ltd. 熱交換器及びその製造方法
DE102005048838A1 (de) * 2005-10-12 2006-09-21 Daimlerchrysler Ag Wärmetauscher
JP2007185709A (ja) * 2005-12-12 2007-07-26 Denso Corp ろう接方法及びろう接構造体
JP4916967B2 (ja) * 2007-07-13 2012-04-18 株式会社ティラド モジュールタイプ熱交換器の接続構造
JP2009024956A (ja) * 2007-07-20 2009-02-05 Calsonic Kansei Corp 熱交換器のヘッダタンクおよびその製造方法
JP5717367B2 (ja) * 2010-07-06 2015-05-13 株式会社ティラド モジュール型熱交換器のタンク構造
DE202011110101U1 (de) * 2011-07-05 2012-12-05 Lothar Rühland Wärmetauscheranordung
CN106288893A (zh) * 2015-06-03 2017-01-04 丹佛斯微通道换热器（嘉兴）有限公司 换热器系统
KR102366934B1 (ko) * 2015-07-22 2022-02-23 엘지전자 주식회사 열교환모듈 및 이를 포함하는 세탁물 처리장치
CN106918166B (zh) * 2015-12-24 2023-03-03 丹佛斯微通道换热器（嘉兴）有限公司 换热器和空调系统
JP2018162953A (ja) 2017-03-27 2018-10-18 パナソニックＩｐマネジメント株式会社 熱交換器
JP6874498B2 (ja) * 2017-04-19 2021-05-19 株式会社デンソー 熱交換器
US10823511B2 (en) * 2017-06-26 2020-11-03 Raytheon Technologies Corporation Manufacturing a heat exchanger using a material buildup process

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EP4242569A1 (en) 2023-09-13

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