EP2141430A2 - Échangeur de chaleur - Google Patents

Échangeur de chaleur Download PDF

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Publication number
EP2141430A2
EP2141430A2 EP09164420A EP09164420A EP2141430A2 EP 2141430 A2 EP2141430 A2 EP 2141430A2 EP 09164420 A EP09164420 A EP 09164420A EP 09164420 A EP09164420 A EP 09164420A EP 2141430 A2 EP2141430 A2 EP 2141430A2
Authority
EP
European Patent Office
Prior art keywords
line
tube
heat exchanger
fin
diameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09164420A
Other languages
German (de)
English (en)
Other versions
EP2141430A3 (fr
Inventor
Sang Yeul Lee
Han Choon Lee
Dong Hwi Kim
Ju Hyok Kim
Hong Seong Kim
Yong Cheol Sa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP2141430A2 publication Critical patent/EP2141430A2/fr
Publication of EP2141430A3 publication Critical patent/EP2141430A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • 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
    • F28F1/24—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 transversely
    • F28F1/32—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 transversely the means having portions engaging further tubular elements
    • 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
    • F28F1/24—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 transversely
    • F28F1/32—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 transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2210/00—Heat exchange conduits
    • F28F2210/08—Assemblies of conduits having different features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/02—Arrangements of fins common to different heat exchange sections, the fins being in contact with different heat exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the present disclosure relates to a heat exchanger.
  • a heat exchanger is designed such that an internal refrigerant is heat-exchanged with external fluid.
  • the heat exchangers may be classified into fin-tube type heat exchangers and micro channel tube type heat exchangers.
  • the fin-tube type heat exchanger includes a plurality of fins and a plurality of refrigerant tubes penetrating the fins.
  • the external fluid e.g., air
  • the refrigerant tubes may include a plurality of front line tubes and a plurality of rear line tubes to enlarge a flow area of the external fluid.
  • the front and rear line tubes are arranged in a zigzag pattern.
  • the present disclosure provides a heat exchanger that can improve a heat exchange performance.
  • a heat exchanger includes: at least one fin provided with a plurality of slits; and a plurality of refrigerant tubes penetrating the fin; wherein, the refrigerant tubes include at least one front line tube and at least one rear line tube having a different diameter from the front line tube with reference to a fluid flow direction; and the slits include at least one front line slit and at least one rear line slit having a difference width with reference to the fluid flow direction.
  • Fig. 1 is a perspective view of a heat exchanger according to a first embodiment.
  • Fig. 2 is a cross-sectional view of the heat exchanger of Fig. 1 .
  • Fig. 3 is a graph illustrating fin efficiencies of a related art heat exchanger and the heat exchanger of Fig. 1 .
  • Figs. 4 and 5 are graphs illustrating a heat transfer performance and pressure loss in accordance with a width of a fin.
  • Fig. 6 is a perspective view of a heat exchanger according to a second embodiment.
  • Fig. 7 is a cross-sectional view of the heat exchanger of Fig. 7 .
  • Fig. 8 is a cross-sectional view of a heat exchanger according to a third embodiment.
  • Fig. 9 is a graph illustrating a pressure loss in accordance with a rear line slit in a last line and a rear end of a fin.
  • Fig. 10 is a graph illustrating a pressure loss in accordance with a distance between a center of a rear line tube and an adjacent rear line slit.
  • Fig. 1 is a perspective view of a heat exchanger according to a first embodiment and Fig. 2 is a cross-sectional view of the heat exchanger of Fig. 1 .
  • a heat exchanger of a first embodiment includes a plurality of refrigerant tubes 10 along which fluid flows and a plurality of fins 20 penetrating the refrigerant tubes 10.
  • the refrigerant tubes 10 include a plurality of front line tubes 11 that are located at a front side with reference to a fluid flow direction and a plurality of rear line tubes 12 that are located at a rear side with reference to the fluid flow direction.
  • the front line tubes 11 are spaced apart from each other at predetermined intervals in a perpendicular direction to the fluid flow direction.
  • the rear line tubes 12 are also spaced apart from each other at predetermined intervals in the perpendicular direction (an up-down direction in Fig. 2 ) to the fluid flow direction.
  • the front line tubes 11 and the rear line tubes 12 are arranged in a zigzag pattern relative to each other. That is, each of the front line tubes 11 is located between two rear line tubes 120.
  • the fins 20 are spaced apart from each other at predetermined intervals.
  • the front and rear line tubes 11 and 122 penetrate each of the fins 20.
  • a diameter D1 of the front tube 11 is less than a diameter D2 of the rear line tube 12 so that the fluid can effectively pass through the heat exchanger 1.
  • a part of the fluid introduced from the front side of the front line tubes 11 into spaces between the fins 20 passes around the front line tubes 11 and is then discharged to a rear side of the rear line tubes 12.
  • a part of the fluid stays at a rear side adjacent to the front line tubes 11.
  • the area where the fluid stays at the rear side of the front line tubes 11 is referred to as a wake area W.
  • the wake area W As an amount of the fluid staying at the wake area W increases or the wake area W increases, the fluid cannot effectively flow.
  • the front line tube 11 is designed such that a diameter thereof is less than a diameter of the rear line tube 12 so that the amount of the fluid staying at the wake area W or the wake area W can be reduced and thus the fluid can effectively flow.
  • the heat exchange between the fluid and the refrigerant can be effectively realized and thus the heat exchange performance of the heat exchanger can be improved.
  • a ratio between the diameter D1 of the front line tube 11 and the diameter D2 of the rear line tube 12 is set to satisfy the following:
  • the ratio between the diameter D1 of the front line tube 11 and the diameter D2 of the rear line tube 12 is less than 1.1 (i.e., when the diameter D1 of the front line tube 11 is almost same as the diameter D2 of the rear line tube 12), it is difficult to achieve the reduction of the amount of the fluid at the wake area W.
  • the ratio between the diameter D1 of the front line tube 11 and the diameter D2 of the rear line tube 12 is greater than 1.5, an amount of the refrigerant flowing along the front line tubes 11 is significantly less than the amount of the fluid flowing around the rear line tubes 12 less than 1.1 and thus the heat exchange performance is significantly reduced.
  • L1 a distance from a from end 20a of the fin 20, which initially meets the fluid with reference to the fluid flow direction to a center of the front line tubes 11
  • L2 a distance from a rear end 20b of the fin 20 to a center of the rear line tube 12
  • R a horizontal distance from the center of the front line tubes 11 and the center of the rear line tubes 12
  • R and L2 are set to satisfy the following:
  • the L1 is set to be less than L2 and the L1 and L2 are set to satisfy the following:
  • R, L1, and L2 are set to satisfy the following:
  • the front fin may be 2L1 and the rear fin may be 2L2.
  • the diameter D1 of the front line tube 11 and the distance L1 from the front end of the fin 20 to the center of the front line tube 11 are set to satisfy the following:
  • the diameter D1 of the front line tube 11 may be set within a range of 4.5-5.5 mm.
  • the 2L1 may be less than 9.5 mm.
  • the diameter D2 of the rear line tube 12 and the distance L2 from the rear end of the fin 20 to the center of the rear line tubes are set to satisfy the following:
  • the diameter D2 of the rear line tube 12 may be formed within a range of 6.5-7.5 mm.
  • the 2L2 may be set to be less than 11.5 mm.
  • the diameter D1 of the front line tube 11 is set to be less than the diameter D2 of the rear line tube 12
  • the fluid flow resistance by the front line tube 11 is reduced and the wake area in rear of the front line tubes 11 is reduced. Further, as the fluid flow resistance is reduced, an amount of the fluid increases and the fluid flow noise can be reduced.
  • the distance from the front end of the fin 20 to the center of the front line tube 11 is less than the distance from the rear end of the fin 20 to the center of the rear line tube 12, an overall width of the fin is reduced and thus the heat exchanger can be formed in a more compact design.
  • Fig. 3 is a graph illustrating fin efficiencies of a related art heat exchanger and the heat exchanger of Fig. 1 and Figs. 4 and 5 are graphs illustrating a heat transfer performance and pressure loss in accordance with a width of a fin.
  • Fig. 4 is a graph illustrating a case when the diameter D1 of the front line tube is, for example, 5 mm
  • Fig. 5 is a graph illustrating a case when the diameter D1 of the front line tube is, for example, 7 mm.
  • the transverses axis represents a speed of fluid and the longitudinal axis represents fin efficiency.
  • the graph A illustrates a test result using a heat exchanger (a width of the overall fins is 200 mm) where the diameter of the front line tube is 5 mm, the diameter of the rear line tube 7 mm, the width 2L1 of the front line fin 2L1 is 9 mm, and the width 2L2 of the rear line fin is 11 mm.
  • the graph B illustrates a test result using a heat exchanger (a width of the overall fins is 22 mm) where the diameter of the front line tube is 7 mm, the diameter of the rear line tube 7 mm, the width 2L1 of the front line fin 2L1 is 11 mm, and the width 2L2 of the rear line fin is 11 mm.
  • the diameter of the front line tube is 5 mm and the width of the front line fin is approximately 9 mm, the increase of the pressure loss can be prevented while keeping the heat transfer performance.
  • the increase of the pressure loss can be prevented while keeping the heat transfer performance.
  • the wake area in rear of the front line tube can be reduced.
  • the front line fin is designed to have a greater width than the rear line fin, the heat transfer performance can be kept. Therefore, the overall size of the heat exchanger can be reduced while the heat exchange performance of the heat exchanger is improved.
  • Fig. 6 is a perspective view of a heat exchanger according to a second embodiment and Fig. 7 is a cross-sectional view of the heat exchanger of Fig. 7 .
  • a heat exchanger of a second embodiment includes a plurality of front line tubes 11, a plurality of rear line tubes 12, a plurality of front line fins 30 through which the front line tubes 11 pass, and a plurality of rear line fins 40 through which the rear line tubes 12 pass.
  • front line fins 30 and the rear line fins 40 are spaced apart from each other. That is, the front line tubes 11 and the rear line tubes 12 penetrate different fins.
  • a diameter D1 of the front line tube 11 is set to be less than a diameter D2 of the rear line tube 12.
  • a ratio between the diameter D1 and the diameter D2 are set to satisfy the following:
  • a width W1 of the front line fin 30 in a direction in parallel with a fluid flow direction is set to be less than a width W2 of the rear fin 40.
  • a radio between the widths W1 and W2 is set to satisfy the following:
  • the heat exchanger can be more compact.
  • the diameter D1 of the front line tube 11 and the width W1 of the front line fin 30 are set to satisfy the following:
  • the diameter D1 of the rear line tube 12 and the width W2 of the rear line fin 40 are set to satisfy the following:
  • diameter D1 of the front line tube 11 and the width W1 of the front line fin 30 are set to satisfy the following:
  • the diameter D1 of the front line tube 11 may be set within a range of 4.5-5.5 mm.
  • the diameter D1 of the front line tube 11 is 5 mm, the width of the front line fin 30 will be 9.5 mm.
  • diameter D2 of the rear line tube 12 and the width W2 of the rear line fin 40 are set to satisfy the following:
  • the diameter D2 of the rear line tube 12 may be set within a range of 6.5-7.5 mm.
  • the width of the rear line fin 40 will be less than 11.5 mm.
  • Fig. 8 is a cross-sectional view of a heat exchanger according to a third embodiment.
  • the third embodiment is identical to the first embodiment except that a plurality of slits are formed on the fins. Therefore, only the features of the third embodiment will be described hereinafter.
  • a heat exchanger of this embodiment includes a plurality of front line tubes 11, a plurality of rear line tubes 12, and a plurality of fins 50 through which the front and rear line tubes 11 and 12 pass.
  • the fin 50 includes a front line slit portion formed between the front line tubes 11 with reference to a length direction (a perpendicular direction to a fluid flow direction, hereinafter, an up-down direction in Fig. 8 ) of the fin 50 and a rear line slit portion formed between the rear line tubes 12.
  • the front line slit portion includes a plurality of front line slits 51 that are arranged in series in a direction in parallel with the fluid flow direction.
  • the front line slits 51 may be formed in two or more lines.
  • the slits 51 are arranged in four lines in Fig. 8 .
  • the rear line slit portion includes a plurality of rear line slits 52 that are arranged in series in a direction in parallel with the fluid flow line.
  • the rear line slits 52 may be arrange in three or more lines. In Fig. 8 , the rear line slits 52 are arranged in, for example, four lines.
  • a width w1 of the front slit 51 is set to be same as or less than a width w2 of the rear line slit 52. Further, the width w1 of the front line slit 51 may be formed within a range of 0.8-1.1 mm.
  • width w1 of the front line sit 51 and the width w2 of the rear line slit 52 are set to satisfy the following:
  • a distance between the front line slits 51 is equal to or less than a distance d2 between the rear line slits 52.
  • the distance between the front line slits 51 is equal to or greater than the width w1 of the front line slit 51.
  • the distance d2 between the rear line slits 52 is equal to or greater than the width w2 of the rear line slit 52.
  • width w1 of the front line slit 51 and the distance d1 between the front line slits 51 are set to satisfy the following:
  • the distance d2 between the rear line slits 52 and the width w2 of the rear line slit 52 are set to satisfy the following:
  • a distance A1 from a front end of the fin 50 to the front line slit 51a in the first line of the front line slit portion is set to satisfy the following:
  • the front line slits 51a in the first line are formed to be adjacent to the front end of the fin 51 so as to increase a heat exchange area with a low temperature fluid.
  • the A1 is less than 0.6 mm, it is difficult to process the front line slit in the first line and to achieve the boundary layer destruction effect that is a function of the slit.
  • the A1 is greater than 1.2 mm, the boundary layer of the fluid (air) is not destructed and the fluid flow distance increases. Therefore, the heat exchanger performance is deteriorated as compared with the case where the A1 is less than 1.2 mm.
  • a distance A2 from a rear end of the fin 50 to the rear line slit 52a in the last line of the rear line slit portion may be formed within a range of 0.8-1.4 mm.
  • A1 and A2 are set to satisfy the following:
  • a distance cw from an imaginary line connecting a center C1 of the front line tubes 11 to a center C2 of the rear line tubes 12 to a slit adjacent to the imaginary line is set to be greater than 0.5 mm.
  • a distance between the front line slit in the second line and the front line slit in the third line is formed to be equal to or greater than 1 mm and a distance between the rear line slit in the second line and the rear line slit in the third line is formed to be equal to or greater than 1 mm.
  • Fig. 9 is a graph illustrating a pressure loss in accordance with the rear line slit in the last line and the rear end of the fin.
  • the transverse axis indicates a distance A1 (mm) between the last line of the rear slits and the rear end of the fin and the longitudinal line indicates the pressure loss.
  • other test conditions are same as the graph of Fig. 4 .
  • the condensed water discharge performance varies in accordance with the amount of the pressure loss. That is, when the condensed water is not effectively discharged, the pressure loss increases. When the condensed water is effectively discharged, the pressure loss is reduced.
  • the pressure loss when the pressure loss is 100% when the A2 is 0.8 mm, the pressure loss increases when the distance L2 is less than 0.8 mm. In addition, when the distance L2 is greater than 0.8 mm, the pressure loss is reduced, in the course of which, when the distance L2 is equal to or greater than 1.4 mm, the pressure loss is constantly maintained.
  • the A2 may be formed within a range of 0.8-1.4 mm.
  • Fig. 10 is a graph illustrating a pressure loss in accordance with a distance between a center of the rear line tube and the adjacent rear line slit.
  • the transverse line indicates two times a distance 2CW(mm) between the center of the rear line tube and the adjacent rear line slit and the longitudinal line indicates the pressure loss.
  • Other test conditions are same as Fig. 9 .
  • the pressure loss when it is assumed that the pressure loss is 100% when the 2CW is 1.0 mm, the pressure loss increases when the 2CW is less than 1.0 mm. In addition, when the 2CW is greater than 1.0 mm, the pressure loss is reduced, in the course of which, when the 2CW is equal to and greater than 1.8 mm, the pressure loss is constantly maintained.
  • the 2CW may be formed within a range of 1.0-1.8 mm.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP09164420A 2008-07-04 2009-07-02 Échangeur de chaleur Withdrawn EP2141430A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080065059A KR101520484B1 (ko) 2008-07-04 2008-07-04 열교환기

Publications (2)

Publication Number Publication Date
EP2141430A2 true EP2141430A2 (fr) 2010-01-06
EP2141430A3 EP2141430A3 (fr) 2011-04-13

Family

ID=41136712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09164420A Withdrawn EP2141430A3 (fr) 2008-07-04 2009-07-02 Échangeur de chaleur

Country Status (4)

Country Link
US (1) US20100000726A1 (fr)
EP (1) EP2141430A3 (fr)
KR (1) KR101520484B1 (fr)
CN (1) CN101619938B (fr)

Cited By (1)

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EP3315869A4 (fr) * 2015-06-25 2019-03-27 Toshiba Carrier Corporation Échangeur de chaleur et climatiseur du type à installation au plafond

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US8978743B2 (en) * 2009-09-16 2015-03-17 Panasonic Intellectual Property Management Co., Ltd. Fin tube heat exchanger
JP5689033B2 (ja) * 2011-06-28 2015-03-25 三菱電機株式会社 フィンチューブ型熱交換器及びこれを用いた冷凍サイクル装置
CN106885481B (zh) * 2016-05-24 2019-03-19 无锡市金城环保炊具设备有限公司 一种烟道口带热烟气余热高效回收利用的技术方法
CN106247820A (zh) * 2016-06-21 2016-12-21 四川长虹电器股份有限公司 一种异径管换热器及空调机
US11313568B2 (en) * 2018-01-20 2022-04-26 Daikin Industries, Ltd. System and method for heating and cooling
US11774187B2 (en) * 2018-04-19 2023-10-03 Kyungdong Navien Co., Ltd. Heat transfer fin of fin-tube type heat exchanger
CN108895861B (zh) * 2018-04-24 2020-08-25 青岛海尔空调器有限总公司 换热器及空调器

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KR101520484B1 (ko) 2015-05-14
KR20100004724A (ko) 2010-01-13
EP2141430A3 (fr) 2011-04-13
CN101619938A (zh) 2010-01-06
US20100000726A1 (en) 2010-01-07

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