US20240060722A1 - Heat exchanger and refrigeration cycle apparatus - Google Patents

Heat exchanger and refrigeration cycle apparatus Download PDF

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Publication number
US20240060722A1
US20240060722A1 US18/259,445 US202118259445A US2024060722A1 US 20240060722 A1 US20240060722 A1 US 20240060722A1 US 202118259445 A US202118259445 A US 202118259445A US 2024060722 A1 US2024060722 A1 US 2024060722A1
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United States
Prior art keywords
heat
transfer
members
heat exchanger
transfer members
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US18/259,445
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English (en)
Inventor
Akira YATSUYANAGI
Tsuyoshi Maeda
Shin Nakamura
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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: MAEDA, TSUYOSHI, NAKAMURA, SHIN, YATSUYANAGI, Akira
Publication of US20240060722A1 publication Critical patent/US20240060722A1/en
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    • 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
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0025—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes
    • F28D7/0033—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes the conduits for one medium or the conduits for both media being bent
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple 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
    • 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
    • F28F1/16—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 the means being integral with the element, e.g. formed by extrusion
    • 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
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • 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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/06—Reinforcing means for fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts

Definitions

  • the present disclosure relates to a heat exchanger and a refrigeration cycle apparatus.
  • Japanese Patent Laying-Open No. 2018-155481 (PTL 1) describes a heat exchanger including a plurality of heat transfer tube units, each of the plurality of heat transfer tube units including a plurality of fins and a plurality of heat transfer tubes.
  • the plurality of heat transfer tube units are arranged apart from each other in an arrangement direction of the heat transfer tube units.
  • the plurality of heat transfer tubes extend in a heat transfer tube extension direction vertical to the arrangement direction of the heat transfer tube units, and the plurality of fins and the plurality of heat transfer tubes are alternately arranged in a heat transfer tube spaced-apart direction vertical to the arrangement direction of the heat transfer tube units and the heat transfer tube extension direction.
  • the plurality of fins include a portion inclined with respect to the heat transfer tube spaced-apart direction.
  • Each heat transfer unit is connected to a first header and a second header.
  • a pitch in the arrangement direction of the heat transfer tube units needs to be set relatively narrow in order to improve the heat transfer performance of the heat transfer tube units.
  • the heat exchanger described in PTL 1 has difficulty in improving the heat transfer performance without decreasing the formability of the first header and the second header.
  • a main object of the present invention is to provide a heat exchanger that can improve the heat transfer performance without decreasing the formability of a first header and a second header, and a refrigeration cycle apparatus including the heat exchanger.
  • a heat exchanger includes: a first header and a second header extending in a first direction and arranged apart from each other in a second direction perpendicular to the first direction; and a plurality of heat-transfer members arranged apart from each other in the first direction, each of the plurality of heat-transfer members having a first end in the second direction connected to the first header and a second end in the second direction connected to the second header.
  • An internal space, through which a first heat exchange medium flows, of each of the first header, the second header, and the plurality of heat-transfer members is separated from an external space through which a second heat exchange medium flows.
  • the internal space of the first header communicates with the internal space of the second header through the internal space of each of the plurality of heat-transfer members.
  • the heat exchanger further includes: at least one heat-transfer promotion member; and at least one positioning member, the at least one heat-transfer promotion member being located in the external space, being arranged in a central region between two heat-transfer members adjacent to each other in the first direction among the plurality of heat-transfer members, and extending in a third direction, the at least one positioning member being located in the external space, positioning the at least one heat-transfer promotion member with respect to the first header, the second header, and the plurality of heat-transfer members, and being arranged only on a downstream side in the third direction in which the second heat exchange medium flows, relative to the internal space of each of the plurality of heat-transfer members.
  • a heat exchanger that can improve the heat transfer performance without decreasing the formability of a first header and a second header, and a refrigeration cycle apparatus including the heat exchanger.
  • FIG. 1 is a perspective view showing a heat exchanger according to a first embodiment.
  • FIG. 2 is a cross-sectional view when viewed from an arrow II-II in FIG. 1 .
  • FIG. 3 is a cross-sectional view when viewed from an arrow in FIG. 1 .
  • FIG. 4 is a partial front view of the heat exchanger shown in FIG. 1 .
  • FIG. 5 is a partial cross-sectional view showing a first modification of a plurality of heat-transfer members of the heat exchanger according to the first embodiment.
  • FIG. 6 is a partial cross-sectional view showing a second modification of the plurality of heat-transfer members of the heat exchanger according to the first embodiment.
  • FIG. 7 is a partial cross-sectional view showing a third modification of the plurality of heat-transfer members of the heat exchanger according to the first embodiment.
  • FIG. 8 is a perspective view showing a heat exchanger according to a second embodiment.
  • FIG. 9 is a cross-sectional view when viewed from an arrow IX-IX in FIG. 8 .
  • FIG. 10 is a cross-sectional view when viewed from an arrow X-X in FIG. 8 .
  • FIG. 11 is a partial cross-sectional view when viewed from an arrow XI-XI in FIGS. 9 and 10 .
  • FIG. 12 is a partial cross-sectional view showing a heat-transfer promotion member of a heat exchanger according to a third embodiment.
  • FIG. 13 is a partial cross-sectional view showing a third modification of the heat-transfer promotion member of the heat exchanger according to the third embodiment.
  • FIG. 14 is a partial cross-sectional view showing a fourth modification of the heat-transfer promotion member of the heat exchanger according to the third embodiment.
  • FIG. 15 is a partial cross-sectional view showing a fifth modification of the heat-transfer promotion member of the heat exchanger according to the third embodiment.
  • FIG. 16 is a partial cross-sectional view showing a sixth modification of the heat-transfer promotion member of the heat exchanger according to the third embodiment.
  • FIG. 17 is a partial cross-sectional view showing a heat exchanger according to a fourth embodiment.
  • FIG. 18 is a graph showing that a ratio ⁇ P1/ ⁇ P2 between a pressure loss ⁇ P1 of air flowing through an air path shown in FIG. 17 and a pressure loss ⁇ P2 of air flowing through an air path according to a comparative example changes in accordance with a dimension ratio between each heat-transfer member and each heat-transfer promotion member of the heat exchanger shown in FIG. 17 .
  • FIG. 19 is a graph derived from the graph shown in FIG. 18 and showing a dimension ratio between each heat-transfer member and each heat-transfer promotion member that allows ratio ⁇ P1/ ⁇ P2 between the pressure losses to be equal to or lower than 100%.
  • FIG. 20 shows a refrigeration cycle apparatus according to a fifth embodiment.
  • each figure shows a first direction X, a second direction Z and a third direction Y that are perpendicular to each other.
  • a heat exchanger 100 includes a first header 11 , a second header 12 , a plurality of heat-transfer members 1 , a plurality of heat-transfer promotion members 2 , a plurality of positioning members 3 , a first reinforcing member 13 , and a second reinforcing member 14 .
  • Heat exchanger 100 is provided to perform heat exchange between a first heat exchange medium (e.g., refrigerant) flowing in second direction Z and a second heat exchange medium (e.g., air) flowing in third direction Y.
  • Second direction Z is, for example, along a vertical direction.
  • First direction X and third direction Y are, for example, along a horizontal direction.
  • Each of first header 11 and second header 12 is a so-called distribution device.
  • the plurality of heat-transfer members 1 are so-called heat transfer tubes.
  • the plurality of heat-transfer promotion members 2 are not so-called heat transfer tubes.
  • An internal space, through which the refrigerant can flow, of each of first header 11 , second header 12 , and the plurality of heat-transfer members 1 is separated from an external space through which the air can flow.
  • the internal spaces of first header 11 and second header 12 communicate with each other through the internal space of each of the plurality of heat-transfer members 1 .
  • the internal spaces of the plurality of heat-transfer members 1 are connected in parallel to each other with respect to the internal spaces of first header 11 and second header 12 .
  • the refrigerant flowing from a first inflow/outflow portion 15 into the internal space of first header 11 is distributed into the internal spaces of the plurality of heat-transfer members 1 .
  • Heat exchange is performed between the refrigerant flowing through the internal spaces of the plurality of heat-transfer members 1 in the second direction and the air flowing through the external space of the plurality of heat-transfer members 1 in third direction Y.
  • the refrigerant flowing through the internal spaces of the plurality of heat-transfer members 1 flows out to the internal space of second header 12 and joins, and then, is discharged from a second inflow/outflow portion 16 to the outside of heat exchanger 100 .
  • each of first header 11 , second header 12 and the plurality of heat-transfer members 1 which is surrounded by first header 11 , second header 12 , first reinforcing member 13 , and second reinforcing member 14 , is provided such that the air flows in third direction Y.
  • the upstream side of the air flowing in third direction Y will be simply referred to as “upstream side in third direction Y”
  • the downstream side of the air flowing in third direction Y will be simply referred to as “downstream side in third direction Y”.
  • the above-described external space is open on each of the upstream side and the downstream side in third direction Y.
  • first header 11 and second header 12 extend in first direction X and are arranged apart from each other in second direction Z.
  • First header 11 includes first inflow/outflow portion 15 through which the refrigerant flows in or flows out.
  • Second header 12 includes second inflow/outflow portion 16 through which the refrigerant flows in or flows out.
  • the plurality of heat-transfer members 1 are arranged apart from each other in first direction X.
  • Each of the plurality of heat-transfer members 1 has one end in second direction Z connected to first header 11 , and the other end in second direction Z connected to second header 12 .
  • first header 11 includes a plurality of insertion holes arranged apart from each other in first direction X. One end of each of the plurality of heat-transfer members 1 in first direction X is inserted into each of the plurality of insertion holes formed in first header 11 .
  • second header 12 includes a plurality of insertion holes arranged apart from each other in first direction X. The other end of each of the plurality of heat-transfer members 1 in first direction X is inserted into each of the plurality of insertion holes formed in second header 12 .
  • the plurality of heat-transfer promotion members 2 are for suppressing the air flowing between two heat-transfer members 1 adjacent to each other in first direction X from flowing, in a concentrated manner, through a central region between these two heat-transfer members 1 in first direction X. As shown in FIGS. 1 to 4 , each of the plurality of heat-transfer promotion members 2 is located in the above-described external space, and is arranged in a central region between two heat-transfer members 1 adjacent to each other in first direction X among the plurality of heat-transfer members 1 .
  • Each of the plurality of heat-transfer promotion members 2 is, for example, arranged to overlap, in second direction Z, with a center line C 1 passing through the center in first direction X between two heat-transfer members 1 adjacent to each other in first direction X and extending in third direction Y.
  • a center line of each of the plurality of heat-transfer promotion members 2 passing through the center in first direction X and extending in third direction Y is, for example, arranged to overlap with above-described center line C 1 in second direction Z.
  • Each of the plurality of heat-transfer promotion members 2 extends in third direction Y.
  • Each of the plurality of heat-transfer promotion members 2 partitions the above-described external space in first direction X.
  • Each of the plurality of heat-transfer promotion members 2 is spaced apart from each of the plurality of heat-transfer members 1 .
  • the plurality of heat-transfer promotion members 2 are not in contact with each of the plurality of heat-transfer members 1 .
  • the plurality of heat-transfer promotion members 2 are spaced apart from each of first header 11 and second header 12 .
  • the plurality of heat-transfer promotion members 2 are not in contact with each of first header 11 and second header 12 .
  • a surface of each of the plurality of heat-transfer promotion members 2 facing in first direction X is, for example, a plane.
  • each of the plurality of heat-transfer promotion members 2 facing in first direction X is, for example, parallel to a surface of each of the plurality of heat-transfer members 1 facing in first direction X.
  • Each of the plurality of heat-transfer promotion members 2 does not include, for example, a through hole extending from one surface to the other surface facing in first direction X.
  • Each of the plurality of heat-transfer promotion members 2 is not connected to a not-shown fin.
  • the plurality of positioning members 3 are located in the above-described external space, and position each of the plurality of heat-transfer promotion members 2 with respect to first header 11 , second header 12 , first reinforcing member 13 , second reinforcing member 14 , and the plurality of heat-transfer members 1 .
  • Each of the plurality of positioning members 3 is connected to each of the plurality of heat-transfer promotion members 2 , first reinforcing member 13 and second reinforcing member 14 .
  • Each of the plurality of positioning members 3 is spaced apart from the plurality of heat-transfer members 1 .
  • Each of the plurality of positioning members 3 is not in contact with the plurality of heat-transfer members 1 .
  • Each of the plurality of positioning members 3 is not connected to a not-shown fin.
  • Each of the plurality of positioning members 3 includes a beam portion 3 A spanning between first reinforcing member 13 and second reinforcing member 14 and connected to the plurality of heat-transfer promotion members 2 , a connection portion 3 B connected to first reinforcing member 13 , and a connection portion 3 C connected to second reinforcing member 14 .
  • the plurality of positioning members 3 are arranged apart from each other in second direction Z.
  • Each of the plurality of positioning members 3 is, for example, arranged on the first header 11 side or on the second header 12 side relative to the center between first header 11 and second header 12 in second direction Z.
  • a material of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 is not particularly limited.
  • a thermal conductivity of the material of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 may be lower than a thermal conductivity of a material of the plurality of heat-transfer members 1 .
  • First reinforcing member 13 and second reinforcing member 14 are for reinforcing the strength of a structure of first header 11 , second header 12 and the plurality of heat-transfer members 1 assembled as described above.
  • First reinforcing member 13 and second reinforcing member 14 are located in the above-described external space, and are arranged apart from each other in first direction X.
  • First reinforcing member 13 and second reinforcing member 14 are arranged to sandwich the plurality of heat-transfer members 1 and the plurality of heat-transfer promotion members 2 in first direction X.
  • First reinforcing member 13 and second reinforcing member 14 are connected to an outer surface of each of first header 11 and second header 12 .
  • First reinforcing member 13 is connected to one end surface of each of first header 11 and second header 12 in first direction X.
  • Second reinforcing member 14 is connected to the other end surface of each of first header 11 and second header 12 in first direction X.
  • the plurality of heat-transfer members 1 are, for example, configured equivalently to each other.
  • the plurality of heat-transfer promotion members 2 are, for example, configured equivalently to each other.
  • the plurality of positioning members 3 are, for example, configured equivalently to each other.
  • the number of the plurality of heat-transfer members 1 , the number of the plurality of heat-transfer promotion members 2 , and the number of the plurality of positioning members 3 are not particularly limited.
  • the number of the plurality of heat-transfer promotion members 2 is, for example, smaller by one than the number of the plurality of heat-transfer members 1 .
  • the number of the plurality of positioning members 3 is, for example, two.
  • each of the plurality of heat-transfer members 1 has a first end 1 A located on the upstream side in third direction Y, and a second end 1 B located on the downstream side in third direction Y.
  • Each first end 1 A is arranged on the downstream side relative to an end of each of first reinforcing member 13 and second reinforcing member 14 located on the upstream side.
  • Each second end 1 B is arranged on the upstream side relative to an end of each of first reinforcing member 13 and second reinforcing member 14 located on the downstream side.
  • each of the plurality of heat-transfer promotion members 2 has a third end 2 A located on the upstream side in third direction Y, and a fourth end 2 B located on the downstream side in third direction Y.
  • Each third end 2 A is arranged on the downstream side relative to each first end 1 A.
  • Each fourth end 2 B is arranged on the downstream side relative to each second end 1 B.
  • beam portion 3 A of each of the plurality of positioning members 3 is arranged only on the downstream side in third direction Y in the above-described external space, relative to the internal space of each of the plurality of heat-transfer members 1 .
  • beam portion 3 A of each of the plurality of positioning members 3 is arranged only on the downstream side in third direction Y, relative to second end 1 B of each of the plurality of heat-transfer members 1 .
  • connection portions 3 B and 3 C of each of the plurality of positioning members 3 are also arranged only on the downstream side in third direction Y in the above-described external space, relative to the internal space of each of the plurality of heat-transfer members 1 .
  • each of the plurality of heat-transfer members 1 in third direction Y is wider than a width of each of the plurality of heat-transfer members 1 in first direction X.
  • each of the plurality of heat-transfer members 1 has a longitudinal direction along third direction Y, and a lateral direction along first direction X.
  • Each of the plurality of heat-transfer members 1 is, for example, a flat tube.
  • each of the plurality of heat-transfer promotion members 2 is arranged at the center between two heat-transfer members 1 adjacent to each other in first direction X.
  • a width of each of the plurality of heat-transfer promotion members 2 in first direction X is narrower than an interval in first direction X between two heat-transfer members 1 adjacent to each other in first direction X.
  • a width of each of the plurality of heat-transfer promotion members 2 in third direction Y is wider than the width of each of the plurality of heat-transfer promotion members 2 in first direction X.
  • each of the plurality of heat-transfer promotion members 2 has a longitudinal direction along third direction Y, and a lateral direction along first direction X.
  • the interval in first direction X between two heat-transfer members 1 adjacent to each other in first direction X is wider than an interval in first direction X between heat-transfer member 1 and heat-transfer promotion member 2 adjacent to each other in first direction X.
  • the width of each of the plurality of heat-transfer promotion members 2 in first direction X is narrower than the width of each of the plurality of heat-transfer members 1 in first direction X.
  • the width of each of the plurality of heat-transfer promotion members 2 in first direction X is, for example, constant regardless of the position in third direction Y.
  • the interval in first direction X between heat-transfer member 1 and heat-transfer promotion member 2 adjacent to each other in first direction X is, for example, less than a half of the interval in first direction X between two heat-transfer members 1 adjacent to each other in first direction X.
  • a length of each of the plurality of heat-transfer promotion members 2 in second direction Z is shorter than an interval between first header 11 and second header 12 in second direction Z.
  • a width of beam portion 3 A of each of the plurality of positioning members 3 in second direction Z is narrower than a width of each of the plurality of heat-transfer promotion members 2 in second direction Z.
  • the width of beam portion 3 A of each of the plurality of positioning members 3 in second direction Z is wider than the width of each of the plurality of heat-transfer promotion members 2 in first direction X and is narrower than the width of each of the plurality of heat-transfer members 1 in first direction X.
  • a width of each of the plurality of positioning members 3 in first direction X is, for example, equal to or wider than an interval between first reinforcing member 13 and second reinforcing member 14 in first direction X.
  • a heat exchanger according to Comparative Example 1 is different from heat exchanger 100 only in that the heat exchanger according to Comparative Example 1 does not include heat-transfer promotion members 2 .
  • an interval in first direction X between two adjacent heat-transfer members 1 is equal to that of heat exchanger 100 .
  • a heat exchanger according to Comparative Example 2 is different from heat exchanger 100 only in that the heat exchanger according to Comparative Example 2 does not include heat-transfer promotion members 2 and an interval in first direction X between two adjacent heat-transfer members is a half of that of heat exchanger 100 .
  • the interval in first direction X between two adjacent heat-transfer members 1 is substantially equal to the interval in first direction X between heat-transfer member 1 and heat-transfer promotion member 2 in heat exchanger 100 .
  • Heat exchanger 100 includes the plurality of heat-transfer promotion members 2 , each of the plurality of heat-transfer promotion members 2 being located in the above-described external space, being arranged in the central region between two heat-transfer members 1 adjacent to each other in first direction X among the plurality of heat-transfer members 1 , and extending in third direction Y.
  • each of heat-transfer promotion members 2 suppresses the air flowing between two heat-transfer members 1 adjacent to each other in first direction X from flowing, in a concentrated manner, through the central region between these two heat-transfer members 1 in first direction X. Therefore, the air flowing between two adjacent heat-transfer members 1 is more likely to flow along surfaces of heat-transfer members 1 .
  • an extratube heat transfer coefficient of heat exchanger 100 is higher than an extratube heat transfer coefficient of the heat exchanger according to Comparative Example 1 in which heat-transfer promotion members 2 are not provided although the interval in first direction X between two adjacent heat-transfer members 1 is equal to that of heat exchanger 100 .
  • the extratube heat transfer coefficient of heat exchanger 100 is substantially equal to an extratube heat transfer coefficient of the heat exchanger according to Comparative Example 2.
  • an interval in first direction X between the insertion holes into which the heat-transfer members are inserted in each of the first header and the second header needs to be set to be as narrow as the interval in first direction X between the heat-transfer members.
  • the formability of the first header and the second header in the heat exchanger according to Comparative Example 2 is lower than the formability of the first header and the second header in the heat exchanger according to Comparative Example 1.
  • an interval in first direction X between the insertion holes into which heat-transfer members 1 are inserted in each of first header 11 and second header 12 may be set to be wider than that of the heat exchanger according to Comparative Example 2, and set to be as wide as that of the heat exchanger according to Comparative Example 1.
  • heat exchanger 100 can improve the heat transfer performance without decreasing the formability of first header 11 and second header 12 , as compared with the heat exchanger according to Comparative Example 1.
  • Heat exchanger 100 can improve the formability of first header 11 and second header 12 without decreasing the heat transfer performance, as compared with the heat exchanger according to Comparative Example 2.
  • a weight of each of the plurality of heat-transfer promotion members 2 can be made lighter than a weight of each of the plurality of heat-transfer members 1 . Therefore, heat exchanger 100 can be reduced in weight, as compared with the heat exchanger according to Comparative Example 2.
  • the manufacturing cost of each of the plurality of heat-transfer promotion members 2 can be reduced, as compared with the manufacturing cost of each of the plurality of heat-transfer members 1 . Therefore, the manufacturing cost of heat exchanger 100 can be reduced, as compared with the manufacturing cost of the heat exchanger according to Comparative Example 2.
  • each of the plurality of positioning members 3 is arranged only on the downstream side in third direction Y, relative to the internal space of each of the plurality of heat-transfer members 1 .
  • heat exchanger 100 functions as a condenser under the low temperature environment, such as, for example, when a refrigeration cycle apparatus including heat exchanger 100 performs a defrosting operation
  • each of positioning members 3 is less likely to obstruct discharge of the frost melting water generated intensively on the upstream side in third direction Y.
  • each of the plurality of positioning members 3 is connected to each of first reinforcing member 13 and second reinforcing member 14 .
  • the position of each of the plurality of heat-transfer promotion members 2 with respect to the plurality of heat-transfer members 1 is less likely to change, and thus, a decrease in extratube heat transfer coefficient and an increase in pressure loss (a decrease in air-passing property) that are caused when the position changes are suppressed.
  • each of the plurality of positioning members 3 is connected to each of the plurality of heat-transfer members 1 and when the thermal conductivity of the material of each of the plurality of positioning members 3 is relatively low, a thermal resistance of a heat path extending from each heat-transfer member 1 through the plurality of positioning members 3 to the plurality of heat-transfer promotion members 2 is high, which results in a great heat transfer loss (heat loss) in this heat path.
  • heat transfer loss heat transfer loss
  • heat exchanger 100 when heat exchanger 100 functions as an evaporator under the low temperature environment, water vapor in the air flowing between two adjacent heat-transfer members 1 is cooled by each of heat-transfer members 1 to form frost, which adheres to heat-transfer members 1 . Since a temperature of the air flowing on the surface of each of heat-transfer members 1 becomes gradually lower from first end 1 A toward second end 1 B of each of heat-transfer members 1 , an amount of the frost that adheres to the surface of each of heat-transfer members 1 exhibits such a distribution that the amount of the frost is the largest on the first end 1 A side and becomes gradually smaller toward second end 1 B.
  • each of the plurality of heat-transfer promotion members 2 is arranged to overlap with first end 1 A when viewed from first direction X, an area between heat-transfer member 1 and heat-transfer promotion member 2 is likely to be blocked by the frost.
  • third end 2 A of each of the plurality of heat-transfer promotion members 2 is arranged on the downstream side in third direction Y relative to first end 1 A of each of the plurality of heat-transfer members 1 , and thus, the area between heat-transfer member 1 and heat-transfer promotion member 2 is less likely to be blocked by the frost, as compared with the case in which each of the plurality of heat-transfer promotion members 2 is arranged to overlap with first end 1 A when viewed from first direction X.
  • each of the plurality of heat-transfer members 1 may include a heat transfer tube portion 1 C, a fin portion 1 D and a fin portion 1 E.
  • Heat transfer tube portion 1 C is provided with the above-described internal space and is configured similarly to the plurality of heat-transfer members 1 of heat exchanger 100 .
  • Heat transfer tube portion 1 C, fin portion 1 D and fin portion 1 E are, for example, formed integrally.
  • fin portion 1 D extends from heat transfer tube portion 1 C to the upstream side in third direction Y.
  • An end of fin portion 1 D located on the upstream side in third direction Y forms first end 1 A of heat-transfer member 1 .
  • Fin portion 1 E extends from heat transfer tube portion 1 C to the downstream side in third direction Y.
  • An end of fin portion 1 E located on the downstream side in third direction Y forms second end 1 B of heat-transfer member 1 .
  • a space where the refrigerant flows is not formed in fin portion 1 D and fin portion 1 E.
  • each of the plurality of heat-transfer members 1 may be formed by a plurality of heat transfer tubes 1 G arranged side by side and apart from each other in third direction Y.
  • Each of the plurality of heat transfer tubes 1 G is, for example, a circular tube.
  • above-described first end 1 A of each of the plurality of heat-transfer members 1 is an upstream-side end of one heat transfer tube 1 G arranged on the most upstream side among the plurality of heat transfer tubes 1 G.
  • Above-described second end 1 B of each of the plurality of heat-transfer members 1 is a downstream-side end of one heat transfer tube 1 G arranged on the most downstream side among the plurality of heat transfer tubes 1 G.
  • each of the plurality of heat-transfer members 1 may be formed by the plurality of heat transfer tubes 1 G, fin portion 1 D, fin portion 1 E, and a fin portion 1 H.
  • the plurality of heat transfer tubes 1 G are arranged side by side and apart from each other in third direction Y.
  • Fin portion 1 D extends from heat transfer tube 1 G arranged on the most upstream side among the plurality of heat transfer tubes 1 G to the upstream side in third direction Y.
  • Fin portion 1 E extends from heat transfer tube 1 G arranged on the most downstream side among the plurality of heat transfer tubes 1 G to the downstream side in third direction Y.
  • Fin portion 1 H connects heat transfer tubes 1 G.
  • a heat exchanger 101 according to a second embodiment is configured basically similarly to heat exchanger 100 according to the first embodiment and produces an effect similar to the effect produced by heat exchanger 100 according to the first embodiment.
  • heat exchanger 101 according to the second embodiment is different from heat exchanger 100 in that each of the plurality of positioning members 3 is connected to each of the plurality of heat-transfer members 1 .
  • the difference from heat exchanger 100 will be mainly described below.
  • each of the plurality of heat-transfer members 1 of heat exchanger 101 is configured similarly to heat-transfer member 1 according to the above-described first modification.
  • Each of the plurality of heat-transfer members 1 includes heat transfer tube portion 1 C, fin portion 1 D and fin portion 1 E.
  • Heat transfer tube portion 1 C is provided with the above-described internal space and is configured similarly to the plurality of heat-transfer members 1 of heat exchanger 100 .
  • Heat transfer tube portion 1 C, fin portion 1 D and fin portion 1 E are, for example, formed integrally.
  • fin portion 1 D extends from heat transfer tube portion 1 C to the upstream side in third direction Y.
  • An end of fin portion 1 D located on the upstream side in third direction Y forms first end 1 A of heat-transfer member 1 .
  • Fin portion 1 E extends from heat transfer tube portion 1 C to the downstream side in third direction Y.
  • An end of fin portion 1 E located on the downstream side in third direction Y forms second end 1 B of heat-transfer member 1 .
  • a space where the refrigerant flows is not formed in fin portion 1 D and fin portion 1 E.
  • Fin portion 1 E of each of the plurality of heat-transfer members 1 includes a hole 1 F arranged to overlap with each other when viewed from first direction X.
  • Beam portion 3 A of each of the plurality of positioning members 3 is inserted through hole 1 F of each of the plurality of heat-transfer members 1 .
  • Beam portion 3 A of each of the plurality of positioning members 3 is connected to fin portion 1 E of each of the plurality of heat-transfer members 1 .
  • a material of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 may be any material having a relatively high thermal conductivity, and includes, for example, at least one of aluminum (Al) and copper (Cu).
  • Third end 2 A of each of the plurality of heat-transfer promotion members 2 is arranged on the downstream side in third direction Y relative to first end 1 A of each of the plurality of heat-transfer members 1 . Third end 2 A is arranged on the upstream side in third direction Y relative to the plurality of heat transfer tube portions 1 C.
  • Fourth end 2 B of each of the plurality of heat-transfer promotion members 2 is arranged on the upstream side in third direction Y relative to second end 1 B of each of the plurality of heat-transfer members 1 .
  • Beam portion 3 A of each of the plurality of positioning members 3 is arranged on the downstream side in third direction Y relative to the plurality of heat transfer tube portions 1 C. Beam portion 3 A of each of the plurality of positioning members 3 is arranged on the upstream side in third direction Y relative to second end 1 B of each of the plurality of heat-transfer members 1 .
  • Heat exchanger 101 does not include, for example, first reinforcing member 13 and second reinforcing member 14 .
  • Heat exchanger 101 may include first reinforcing member 13 and second reinforcing member 14 .
  • each of the plurality of positioning members 3 is connected to each of the plurality of heat-transfer members 1 . Therefore, in heat exchanger 101 as well, the position of each of the plurality of heat-transfer promotion members 2 with respect to the plurality of heat-transfer members 1 is less likely to change, and thus, a decrease in extratube heat transfer coefficient and an increase in pressure loss (a decrease in air-passing property) that are caused when the position changes are suppressed.
  • each of the plurality of positioning members 3 can function as a reinforcing member that reinforces the strength of heat exchanger 101 .
  • a material of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 includes a material having a relatively high thermal conductivity (e.g., at least one of Al and Cu), and thus, a thermal resistance of a heat path extending from each heat-transfer member 1 through the plurality of positioning members 3 to the plurality of heat-transfer promotion members 2 is relatively low, which results in a relatively small heat transfer loss (heat loss) in this heat path. Therefore, in heat exchanger 101 , a surface of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 can be effectively used as an extratube heat transfer surface.
  • a relatively high thermal conductivity e.g., at least one of Al and Cu
  • heat transfer performance is better, as compared with heat exchanger 100 in which a surface of each of the plurality of heat-transfer promotion members 2 and the plurality of positioning members 3 cannot be effectively used as an extratube heat transfer surface.
  • Each of the plurality of heat-transfer members 1 of heat exchanger 101 may be configured similarly to the third modification of heat-transfer member 1 shown in FIG. 7 .
  • a heat exchanger according to a third embodiment is configured basically similarly to heat exchanger 100 according to the first embodiment and produces an effect similar to the effect produced by heat exchanger 100 according to the first embodiment.
  • the heat exchanger according to the third embodiment is different from heat exchanger 100 in that each of the plurality of heat-transfer promotion members 2 includes a protruding portion 21 .
  • the difference from heat exchanger 100 will be mainly described below.
  • each of the plurality of heat-transfer promotion members 2 includes a first portion 20 A, a second portion 20 B, a third portion 20 C, protruding portion 21 , and a protruding portion 22 .
  • first portion 20 A is located on the most upstream side in third direction Y.
  • second portion 20 B is located on the most downstream side in third direction Y.
  • third portion 20 C is located at the center in third direction Y.
  • Protruding portion 21 is located on the downstream side in third direction Y relative to first portion 20 A and protrudes from first portion 20 A in first direction X. Protruding portion 21 is located on the upstream side in third direction Y relative to third portion 20 C and protrudes from third portion 20 C in first direction X.
  • Protruding portion 21 includes flat plate portions 21 A to 21 C. An end of flat plate portion 21 A located on the upstream side is connected to an end of first portion 20 A located on the downstream side. An end of flat plate portion 21 B located on the upstream side is connected to an end of third portion 20 C located on the upstream side. Flat plate portion 21 C connects an end of flat plate portion 21 A located on the downstream side and an end of flat plate portion 21 B located on the upstream side.
  • Flat plate portion 21 A forms an obtuse angle with respect to first portion 20 A.
  • Flat plate portion 21 B forms an obtuse angle with respect to third portion 20 C.
  • Flat plate portion 21 C forms an obtuse angle with respect to each of flat plate portion 21 A and flat plate portion 21 B.
  • Flat plate portion 21 C extends in third direction Y.
  • Protruding portion 22 is located on the downstream side in third direction Y relative to third portion 20 C and protrudes from third portion 20 C in first direction X.
  • Protruding portion 22 is located on the upstream side in third direction Y relative to second portion 20 B and protrudes from second portion 20 B in first direction X.
  • Protruding portion 22 protrudes opposite to protruding portion 21 .
  • Protruding portion 22 includes flat plate portions 22 A to 22 C. An end of flat plate portion 22 A located on the upstream side is connected to an end of third portion 20 C located on the downstream side. An end of flat plate portion 22 B located on the upstream side is connected to an end of second portion 20 B located on the upstream side.
  • Flat plate portion 22 C connects an end of flat plate portion 22 A located on the downstream side and an end of flat plate portion 22 B located on the upstream side.
  • Flat plate portion 22 A forms an obtuse angle with respect to third portion 20 C.
  • Flat plate portion 22 B forms an obtuse angle with respect to second portion 20 B.
  • Flat plate portion 22 C forms an obtuse angle with respect to each of flat plate portion 22 A and flat plate portion 22 B.
  • Flat plate portion 22 C extends in third direction Y.
  • First portion 20 A, second portion 20 B, third portion 20 C, protruding portion 21 , and protruding portion 22 are, for example, formed integrally.
  • First portion 20 A, second portion 20 B, third portion 20 C, protruding portion 21 , and protruding portion 22 are, for example, formed by bending one plate-shaped member. In this case, each of protruding portion 21 and protruding portion 22 forms a recessed portion.
  • First portion 20 A, second portion 20 B and third portion 20 C are arranged at the center between two adjacent heat-transfer members 1 in first direction X.
  • Protruding portion 21 is arranged on the one heat-transfer member 1 side relative to the center between two adjacent heat-transfer members 1 in first direction X.
  • Protruding portion 22 is arranged on the other heat-transfer member 1 side relative to the center between two adjacent heat-transfer members 1 in first direction X.
  • a distance in first direction X between protruding portion 21 and one heat-transfer member 1 relative to the center between two adjacent heat-transfer members 1 in first direction X is shorter than a distance in first direction X between protruding portion 21 and the other heat-transfer member 1 relative to the center between two adjacent heat-transfer members 1 in first direction X.
  • a distance in first direction X between protruding portion 22 and one heat-transfer member 1 relative to the center between two adjacent heat-transfer members 1 in first direction X is longer than a distance in first direction X between protruding portion 22 and the other heat-transfer member 1 relative to the center between two adjacent heat-transfer members 1 in first direction X.
  • An amount of protrusion of protruding portion 21 in first direction X with respect to first portion 20 A and third portion 20 C is, for example, equal to an amount of protrusion of protruding portion 22 in first direction X with respect to second portion 20 B and third portion 20 C.
  • Heat-transfer promotion member 2 is, for example, arranged to be rotationally symmetric by 180 degrees with respect to the center in third direction Y.
  • each of the plurality of heat-transfer promotion members 2 includes protruding portion 21 , and thus, the air flowing between two adjacent heat-transfer members 1 is likely to flow along the surfaces of heat-transfer members 1 and the outdoor heat transfer coefficient is improved, as compared with a heat exchanger in which each of the plurality of heat-transfer promotion members 2 does not include protruding portion 21 .
  • each of protruding portion 21 and protruding portion 22 may have a triangular external shape.
  • each of protruding portion 21 and protruding portion 22 has, for example, an isosceles triangular external shape.
  • an angle formed by two equal sides is, for example, an obtuse angle.
  • each of the plurality of heat-transfer promotion members 2 may include at least one through hole 23 passing through protruding portion 21 in first direction X.
  • Protruding portion 21 may include a plurality of through holes 23 .
  • the plurality of through holes 23 passing through each of flat plate portion 21 A, flat plate portion 21 B and flat plate portion 21 C of protruding portion 21 are formed.
  • Through holes 23 may be provided to pass through at least flat plate portion 21 C.
  • each of the plurality of heat-transfer promotion members 2 may include at least one through hole 23 passing through protruding portion 22 in first direction X.
  • each of the plurality of heat-transfer promotion members 2 may include at least one through hole 23 passing through third portion 20 C in first direction X.
  • Through hole 23 may be formed as a slit including a guide portion that guides an air direction, like a louver formed on a corrugated fin.
  • a plurality of grooves 24 may be formed in an outer perimeter surface of the plurality of heat-transfer promotion members 2 facing in first direction X.
  • Each of the plurality of grooves 24 extends in second direction Z.
  • Each of the plurality of grooves 24 is, for example, continuous to third direction Y.
  • Each of the plurality of grooves 24 is, for example, formed in flat plate portion 21 C of protruding portion 21 .
  • Each of the plurality of grooves 24 is, for example, a groove formed between two projections that protrude in first direction X with respect to an outer perimeter surface of flat plate portion 21 C facing in first direction X and are adjacent to each other in third direction Y.
  • Each of the plurality of grooves 24 has, for example, two inclined surfaces inclined to form an acute angle with respect to third direction Y.
  • Each of the plurality of grooves 24 has, for example, a V-shaped cross-sectional shape.
  • Such grooves 24 can function as a discharge path for condensed water or frost melting water.
  • At least one groove 24 may be formed in the outer perimeter surface of the plurality of heat-transfer promotion members 2 facing in first direction X.
  • Groove 24 may have, for example, a U-shaped cross-sectional shape.
  • Groove 24 may be formed in at least one of first portion 20 A, second portion 20 B, third portion 20 C, flat plate portion 21 A, flat plate portion 21 B, and flat plate portion 21 C.
  • an amount of protrusion of protruding portion 21 in first direction X with respect to first portion 20 A and third portion 20 C may be larger than an amount of protrusion of protruding portion 22 in first direction X with respect to second portion 20 B and third portion 20 C.
  • the amount of protrusion of protruding portion 21 in first direction X with respect to first portion 20 A and third portion 20 C may be smaller than the amount of protrusion of protruding portion 22 in first direction X with respect to second portion 20 B and third portion 20 C.
  • a distance in first direction X between one heat-transfer promotion member 2 and one heat-transfer member 1 adjacent to this heat-transfer promotion member 2 may be set to become gradually shorter from the upstream side toward the downstream side in third direction Y.
  • a width of one heat-transfer promotion member 2 in first direction X may be set to become gradually wider from the upstream side toward the downstream side in third direction Y.
  • a distance in first direction X between one heat-transfer promotion member 2 and each of two heat-transfer members 1 adjacent to each other in first direction X with this heat-transfer promotion member 2 being interposed may be set to become gradually shorter from the upstream side toward the downstream side in third direction Y.
  • An interval W 1 in first direction X between third end 2 A of heat-transfer promotion member 2 and each of two heat-transfer members 1 adjacent to each other in first direction X with this heat-transfer promotion member 2 being interposed is longer than an interval W 2 in first direction X between fourth end 2 B of above-described heat-transfer promotion member 2 and each of above-described two heat-transfer members 1 .
  • Heat-transfer promotion member 2 has, for example, two inclined surfaces 25 and two flat surfaces 26 .
  • Each inclined surface 25 is inclined to form an acute angle with respect to third direction Y.
  • An end of one inclined surface 25 located on the downstream side is connected to an end of one flat surface 26 located on the upstream side.
  • One inclined surface 25 and one flat surface 26 and the other inclined surface 25 and the other flat surface 26 are, for example, line symmetric with respect to a center line of heat-transfer promotion member 2 extending in third direction Y.
  • Each inclined surface 25 is continuous to third end 2 A.
  • Each flat surface 26 is continuous to fourth end 2 B.
  • Each inclined surface 25 and each flat surface 26 are, for example, planes.
  • Each inclined surface 25 and each flat surface 26 may be, for example, curved surfaces.
  • the air flowing between two heat-transfer members 1 adjacent to each other in first direction X is likely to concentrate on a central region between these two heat-transfer members 1 in first direction X, as the air flows toward the downstream side in third direction Y.
  • a heat exchanger including heat-transfer promotion members 2 shown in FIG. 16 the air is likely to flow along the surfaces of heat-transfer members 1 on the downstream side in third direction Y, and thus, the extratube heat transfer coefficient is improved, as compared with heat exchanger 100 including heat-transfer promotion members 2 shown in FIGS. 2 and 3 .
  • the shortest distance between heat-transfer promotion member 2 and one of two heat-transfer members 1 adjacent to each other with this heat-transfer promotion member 2 being interposed is equal to the shortest distance between heat-transfer promotion member 2 and the other of the two heat-transfer members 1 adjacent to each other with this heat-transfer promotion member 2 being interposed, the present disclosure is not limited thereto.
  • the former shortest distance may be different from the latter shortest distance.
  • heat-transfer member 1 may be configured similarly to any one of the modifications shown in FIGS. 5 to 7 .
  • grooves 24 shown in FIG. 15 may be formed in heat-transfer promotion members 2 of the heat exchanger according to the first or second embodiment.
  • a heat exchanger according to a fourth embodiment is configured basically similarly to heat exchanger 100 according to the first embodiment and produces an effect similar to the effect produced by heat exchanger 100 according to the first embodiment.
  • the heat exchanger according to the fourth embodiment is different from heat exchanger 100 in that the below-described relational equation is satisfied. The difference from heat exchanger 100 will be mainly described below.
  • a represents a length of each of the plurality of heat-transfer members 1 in third direction Y.
  • L represents a length of each of the plurality of heat-transfer promotion members 2 in third direction Y.
  • b represents a maximum width of each of the plurality of heat-transfer members 1 in first direction X.
  • p represents a pitch of each of the plurality of heat-transfer members 1 in first direction X.
  • Pitch p refers to a distance in first direction X between a center line C 2 passing through the center of one of two adjacent heat-transfer members 1 in first direction X and extending in third direction Y and a center line C 2 passing through the center of the other of the two adjacent heat-transfer members 1 in first direction X and extending in third direction Y.
  • tP represents an average width of the plurality of heat-transfer promotion members 2 in first direction X. Average width tP is a value obtained by dividing a cross-sectional area of heat-transfer promotion member 2 vertical to second direction Z by above-described length L.
  • the horizontal axis of the graph shown in FIG. 18 indicates a ratio L/a of length L of heat-transfer promotion member 2 in third direction Y to length a of heat-transfer member 1 in third direction Y.
  • the vertical axis of the graph shown in FIG. 18 indicates a ratio of a pressure loss ⁇ P1 of the air flowing through the air path shown in FIG. 17 to a pressure loss ⁇ P2 of the air flowing through an air path according to the comparative example.
  • Pressure loss ⁇ P2 refers to a pressure loss of the air flowing through the air path according to the comparative example.
  • the air path according to the comparative example refers to an air path formed in the heat exchanger according to Comparative Example 2 described above. Specifically, the air path according to the comparative example is different from the air path shown in FIG. 17 in that heat-transfer promotion members 2 are not provided and an interval between two adjacent heat-transfer members in first direction X is a half of pitch p in first direction X between two adjacent heat-transfer members 1 shown in FIG. 17 .
  • a ratio ⁇ P1/ ⁇ P2 changes in accordance with a ratio tP/(p ⁇ b).
  • ratio ⁇ P1/ ⁇ P2 is equal to or lower than 100%, the pressure loss of the air flowing through the air path shown in FIG. 17 is reduced to be equal to or smaller than the pressure loss of the air flowing through the air path according to the above-described comparative example.
  • the graph shown in FIG. 19 is derived from ratio L/a and ratio tP/(p ⁇ b) that allow ratio ⁇ P1/ ⁇ P2 to be equal to or lower than 100% as shown in FIG. 18 .
  • the mathematical equation in FIG. 19 is a relational equation between ratio tP/(p ⁇ b) and ratio L/a when ratio ⁇ P1/ ⁇ P2 is equal to 100%.
  • the pressure loss is reduced to be equal to or smaller than that in the above-described comparative example and the heat transfer performance is improved as compared with the above-described comparative example.
  • the heat exchanger according to the fourth embodiment may be different from the heat exchanger according to the second or third embodiment only in that the above-described relational equation is satisfied.
  • Average width tP of each heat-transfer promotion member 2 shown in FIGS. 12 to 16 is a value obtained by dividing the cross-sectional area of each heat-transfer promotion member 2 vertical to second direction Z by above-described length L thereof.
  • heat-transfer member 1 of the heat exchanger according to the fourth embodiment may be configured similarly to each of heat-transfer members 1 shown in FIGS. 5 to 7 .
  • a refrigeration cycle apparatus 200 includes any one of the heat exchangers according to the first to fourth embodiments.
  • refrigeration cycle apparatus 200 mainly includes, for example, heat exchanger 100 , a compressor 111 , a four-way valve 112 , a heat exchanger 113 , an expansion valve 114 , and a blower 115 .
  • Blower 115 sends air to heat exchanger 100 in third direction Y.
  • Four-way valve 112 performs switching between an operation mode in which heat exchanger 100 functions as an evaporator and an operation mode in which heat exchanger 100 functions as a condenser.
  • First header 11 of heat exchanger 100 is, for example, connected to a discharge port and a suction port of compressor 111 via four-way valve 112 .
  • Second header 12 of heat exchanger 100 is, for example, connected to expansion valve 114 .
  • refrigeration cycle apparatus 200 includes any one of the heat exchangers according to the first to fourth embodiments, refrigeration cycle apparatus 200 enables energy saving, as compared with a refrigeration cycle apparatus including the heat exchanger according to Comparative Example 1. In addition, since refrigeration cycle apparatus 200 includes any one of the heat exchangers according to the first to fourth embodiments, refrigeration cycle apparatus 200 enables energy saving while enabling a reduction in manufacturing cost and weight, as compared with a refrigeration cycle apparatus including the heat exchanger according to Comparative Example 2.

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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)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
US18/259,445 2021-02-26 2021-02-26 Heat exchanger and refrigeration cycle apparatus Pending US20240060722A1 (en)

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PCT/JP2021/007502 WO2022180823A1 (fr) 2021-02-26 2021-02-26 Échangeur de chaleur et dispositif à cycle de réfrigération

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JP (1) JPWO2022180823A1 (fr)
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GB457000A (en) * 1935-10-15 1936-11-19 Frederic Randle Radiators and condensers, particularly for motor-vehicles
JPS62118990U (fr) * 1986-01-16 1987-07-28
JPH02115688U (fr) * 1989-02-28 1990-09-17
DE4120442A1 (de) * 1991-06-20 1992-12-24 Thermal Waerme Kaelte Klima Flachrohrwaermetauscher, herstellungsverfahren desselben und anwendungen
JP4866416B2 (ja) * 2006-02-15 2012-02-01 Ｇａｃ株式会社 熱交換器
FR2941040B1 (fr) * 2009-01-15 2012-08-31 Valeo Systemes Thermiques Intercalaire d'echange de chaleur pour un dispositif d'echange de chaleur
JP5853948B2 (ja) * 2012-12-27 2016-02-09 株式会社デンソー 熱交換器
CN104132482B (zh) * 2014-07-30 2017-02-15 广州涉外经济职业技术学院 平行流式换热器
JP7001917B2 (ja) 2017-03-16 2022-01-20 ダイキン工業株式会社 伝熱管ユニットを有する熱交換器

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