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EP3015808B1 - Échangeur de chaleur, structure d'échangeur de chaleur, et ailette destinée à un échangeur de chaleur - Google Patents

Échangeur de chaleur, structure d'échangeur de chaleur, et ailette destinée à un échangeur de chaleur Download PDF

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Publication number
EP3015808B1
EP3015808B1 EP13888478.8A EP13888478A EP3015808B1 EP 3015808 B1 EP3015808 B1 EP 3015808B1 EP 13888478 A EP13888478 A EP 13888478A EP 3015808 B1 EP3015808 B1 EP 3015808B1
Authority
EP
European Patent Office
Prior art keywords
heat transfer
fin
tubes
heat exchanger
heat
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.)
Active
Application number
EP13888478.8A
Other languages
German (de)
English (en)
Other versions
EP3015808A1 (fr
EP3015808A4 (fr
Inventor
Hideaki Tatenoi
Yoshihiro Hara
Katsuhiro Saito
Yoichi Uefuji
Yasutaka Aoki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication date
Application filed by Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP3015808A1 publication Critical patent/EP3015808A1/fr
Publication of EP3015808A4 publication Critical patent/EP3015808A4/fr
Application granted granted Critical
Publication of EP3015808B1 publication Critical patent/EP3015808B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • 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
    • F28F1/126—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 consisting of zig-zag shaped 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
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins

Definitions

  • one heat exchanger functions as a condenser during a cooling operation and as an evaporator during a heating operation.
  • a heat exchanger in an outdoor unit functions as an evaporator during the heating operation.
  • the evaporator performs the heating operation during cold weather, for example, when the outside air temperature is as low as about -5°C, a frosting phenomenon occurs in the evaporator in which moisture in the air attaches to the evaporator as frost.
  • frosting occurs from the upwind side of the heat exchanger, and the frost gradually grows toward the downwind side.
  • a fin heat transfer area for directly exchanging heat with the air is reduced, thereby reducing a heating capability.
  • the frosting narrows a ventilation path between fins to reduce the volume of air, which also reduces the heating capability.
  • the heat exchanger of the present invention includes the heat transfer walls including a first edge portion and a second edge portion indented toward the downwind side relative to the first edge portion, and the first edge portion and the second edge portion are each disposed at least on every other layer in the direction of the arrangement. Accordingly, a fin pitch between the first edge portions adjacent to each other in the arrangement direction can be widened. As a result, even if frosting occurs locally on the first edge portions positioned on an upwind side end of the fin, the heat exchanger can exchange heat continuously on the downwind side because the ventilation path is secured.
  • the drainage of the melt water can be improved also on the downwind side. Further, even if the remaining melt water solidifies, a heat transfer area of the fin available for exchanging heat directly with the air can be secured appropriately, and in addition, the ventilation path can be prevented from becoming easily clogged.
  • the tubes 21 each have a flat cross section and include a flowpath for a refrigerant penetrating therethrough in the axial direction.
  • the tubes 21 are manufactured by extruding copper or a copper alloy, or aluminum or an aluminum alloy that have excellent thermal conductivity, or by roll forming a plate-like material.
  • the header tubes 30 may be manufactured from a material similar to that of the tubes 21.
  • the tubes 21 may be manufactured integrally or may be manufactured by combining several members.
  • an air conditioner including the heat exchanger 10 as an outdoor heat exchanger is performing the heating operation in a low outside air temperature, frosting occurs on the fin 22 on the upwind side of the airflow A.
  • the upwind side of the airflow A may simply be referred to as the upwind side for short.
  • the air conditioner performs a defrosting operation, for example, regularly for removing the attached frost. If the melt water remains not being fully drained from the heat exchanger 10 after the defrosting operation, it might freeze after resumption of the heating operation, possibly causing frosting again.
  • a second condition is that the heat transfer pieces 23L and 23R are each disposed on every other layer of the heat transfer wall 23, such that the heat transfer pieces 23L and 23R appear alternately on the opposite sides of the midpoint M in the width direction X.
  • the condition is equivalent to that the cutouts are disposed on every other layer of the heat transfer wall 23, alternately on the opposite sides of the midpoint M in the width direction X.
  • the fin 22 can minimize a reduction in heat exchange efficiency.
  • the heat exchanger 10 can ensure a desired heat transfer performance within the area U if the heat transfer pieces 23L and 23R are connected to the tubes 21 such that the heat transfer pieces 23L and 23R are able to exchange heat with the tubes 21.
  • the cutouts of the fin 22 of the embodiment each have a rectangular shape as seen in a plan view
  • the cutouts may have any shape as long as the embodiment achieves the objects of the present invention.
  • the cutouts may adopt several shapes including a circular cutout ( FIG. 6A ), a triangular cutout ( FIG. 6B ), a polygonal cutout ( FIG. 6C ), and a steplike cutout ( FIG. 6D ).
  • turns of the fin 22 may be in any pattern as long as the embodiment achieves the objects of the present invention.
  • FIGS. 7A to 7D and 8B show some patterns adoptable in the present invention, and the present invention may adopt these patterns.
  • FIG. 7A shows a pattern in which lower portions of each heat transfer wall 23 connected to the turn 24 are cut out.
  • FIG. 7B shows a pattern in which upper portions of each heat transfer wall 23 connected to the turn 24 are cut out.
  • the melt water flows downward taking the shortcut route to facilitate drainage of the melt water compared with a conventional corrugated fin in which heat transfer walls 23 are provided almost entirely along the space between the tubes 21, 21.
  • the heat transfer walls 23 are formed along the horizontal direction in the pattern in FIG. 7A , they may be inclined upward toward the middle in the width direction of the fin 22 as shown in FIG. 7C . Similarly, the heat transfer walls 23 in the pattern in FIG. 7B may be inclined downward toward the middle in the width direction of the fin 22 as shown in FIG. 7D . The drainage of the melt water can be further facilitated by thus inclining the heat transfer walls 23.
  • the heat transfer pieces 23L on one side in the width direction X and the heat transfer pieces 23R on the other side are provided not to overlap with each other as seen in a vertical direction (as seen in a plan view), although the present invention is not limited to this.
  • the heat transfer pieces 23L on the one side and the heat transfer pieces 23R on the other side may form overlaps K at the middle portion in the width direction X of the fin 22.
  • This configuration also receives the above beneficial effect obtained by widening the fin pitch P1 of the above described area U because the fin pitch P1 of the heat transfer pieces 23L, 23L ... and the fin pitch P1 of the heat transfer pieces 23R, 23R ... within the area U close to the tubes 21 are twice as wide as the fin pitch P2 of the area D.
  • the fin pitch P1 of the area U is widened by partially cutting out the fin workpiece 25, the present invention is not limited to this.
  • the heat transfer pieces 23L, R may be folded downward to form regions corresponding to the cutouts. Then, the fin pitch P1 of the area U can be made wide compared with the fin pitch P2 of the area D similarly to the fin 22 of the first embodiment.
  • Hanging pieces 23e formed by folding the heat transfer pieces each may be in contact with a surface of the heat transfer wall 23 on the lower layer at its tip as shown in FIG. 8C , or the tip may be away from the surface of the heat transfer wall 23 on the lower layer as shown in FIG. 8D which is not part of the presently claimed invention. In any case, the hanging pieces 23e contribute to facilitate drainage by forming paths for guiding the melt water downward.
  • the heat transfer pieces may be folded at any angle.
  • a louver 28 may be formed on the downwind side of the fin 22 (heat transfer wall 23) as shown in FIG. 9A (mode 2-1).
  • the dehumidification can be performed also on the downwind side as a result of suppressing the dehumidification on the upwind side.
  • a high heat transfer performance on the downwind side as in the mode 2-1 suppresses local frosting on the upwind side, thereby easily securing the ventilation paths 27.
  • a duration of the heating operation can be extended because the heat exchanger 10 can exchange heat continuously on the downwind side.
  • the upwind side of the fin 22 is not required to be processed, thereby suppressing increase in the processing cost.
  • the louver 28 is formed by cutting and raising the heat transfer wall 23 and disturbing the flow of air passing over the louver 28 facilitates heat transfer between the air and the heat transfer wall 23. It is to be noted that the louver 28 facilitates heat transfer more effectively than undulations 29 that will be described later.
  • the louver 28 may be provided at any region.
  • the region is not limited to the downwind side but the louver 28 may be provided on the upwind side.
  • the present invention can also improve heat transfer performance on the upwind side.
  • the undulations 29 may be formed on the upwind side of the fin 22 (heat transfer wall 23) as shown in FIG. 9B (mode 2-2).
  • the undulations 29 is wavy in a vertical cross section of the heat transfer wall 23 and has a shape of repeated mountain, valley, mountain ... from the upwind side to the downwind side.
  • the louver 28 may be provided instead of the undulations 29 as shown in FIG. 9C for improving the heat transfer performance on the upwind side.
  • an end of the fin 22 on the downwind side may be configured similarly to the end of the fin 22 on the upwind side according to the first embodiment. That is, as shown in FIGS. 10A to 10C , either of the opposite sides of the heat transfer wall 23 divided by the midpoint M in the width direction X is cut out. Because of the cutout, a leading edge portion 23d with the cutout is indented toward the upwind side relative to a leading edge portion 23c without the cutout. The leading edge portion 23c without the cutout is provided with heat transfer pieces 23L and 23R protruding toward the downwind side beyond the leading edge portion 23d. In addition, the heat transfer pieces 23L and 23R are each disposed on every other layer of the heat transfer wall 23, such that the heat transfer pieces 23L and 23R appear alternately on the opposite sides of the midpoint M in the width direction X.
  • the third embodiment adopts a configuration of the widened fin pitch also on the downwind side to thereby reduce the amount of the melt water to accumulate on the downwind side. In this way, even if the remaining melt water solidifies after resumption of the heating operation, a heat transfer area of the fin 22 available for exchanging heat can be secured appropriately, and in addition, the ventilation path can be prevented from becoming easily clogged.
  • the configuration of the widened fin pitch may adopt various forms as described in the first embodiment.

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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)
  • Other Air-Conditioning Systems (AREA)

Claims (5)

  1. Échangeur de chaleur (10 ; 10a, 10b) comprenant :
    une pluralité de tubes (21) ayant chacun une trajectoire d'écoulement (21a) à travers laquelle un réfrigérant s'écoule ; et
    une ailette ondulée (22) comprenant une pluralité de parois de transfert de chaleur (23) qui sont agencées dans une direction de circulation des tubes (21) et s'étendent de l'un à l'autre des tubes (21) adjacents parmi la pluralité de tubes (21), l'ailette (22) pouvant échanger la chaleur avec les tubes (21), les parois de transfert de chaleur (23) qui sont agencées dans une direction de circulation des tubes (21) et s'étendent de l'un à l'autre des tubes (21) adjacents parmi la pluralité de tubes (21) définissant un agencement de parois de transfert de chaleur (23), dans lequel :
    les parois de transfert de chaleur (23) comprennent chacune :
    une première pièce de transfert de chaleur (23L) menant à une première partie de bord (23a) positionnée sur un côté vent debout d'un écoulement d'air passant (A) ; et
    une seconde pièce de transfert de chaleur (23R) menant à une deuxième partie de bord (23b) indentée par rapport à la première partie de bord (23a) vers un côté sous le vent dans une direction de l'écoulement d'air (A),
    dans lequel la première partie de bord (23a) et la deuxième partie de bord (23b) sont toutes deux agencées sur le côté vent debout de l'écoulement d'air (A), et
    dans lequel la première pièce de transfert de chaleur (23L) est disposée au niveau de chaque autre couche de l'agencement de parois de transfert de chaleur (23) des deux côtés et plus à proximité d'un tube (21) et la seconde pièce de transfert de chaleur (23R) est disposée au moins sur chaque autre couche de l'agencement de parois de transfert de chaleur (23) des deux côtés et plus à proximité de l'autre tube (21) des tubes (21) adjacents parmi la pluralité de tubes (21) de sorte que la première pièce de transfert de chaleur (23L) et la seconde pièce de transfert de chaleur (23R) apparaissent de manière alternée des deux côtés, et
    dans lequel un premier pas d'ailette (P1) au niveau d'une zone (U) prédéterminée du côté sous le vent debout est plus large qu'un second pas d'ailette (P2) au niveau d'une zone (D) du côté sous le vent par rapport à la zone (U) prédéterminée, et
    caractérisé en ce que la première pièce de transfert de chaleur (23L) et la seconde pièce de transfert de chaleur (23R) sont prévues pour ne pas se chevaucher, comme observé dans une direction verticale.
  2. Échangeur de chaleur (10 ; 10a, 10b) selon la revendication 1, dans lequel :
    les parois de transfert de chaleur (23) comprennent :
    un moyen de facilitation de transfert de chaleur (28 ; 29) du côté vent debout.
  3. Échangeur de chaleur (10 ; 10a, 10b) selon l'une quelconque des revendications 1 à 2, dans lequel :
    les parois de transfert de chaleur (23) comprennent :
    un moyen de facilitation de transfert de chaleur (28) du côté sous le vent.
  4. Échangeur de chaleur (10 ; 10a, 10b) selon l'une quelconque des revendications 1 à 3, dans lequel :
    la première pièce de transfert de chaleur (23L) de chacune des parois de transfert de chaleur (23) mène à une troisième partie de bord (23c) positionnée du côté sous le vent de l'écoulement d'air (A) ; et
    chacune des secondes pièces de transfert de chaleur (23R) mène en outre à une quatrième partie de bord (23d) indentée vers le côté vent debout par rapport à la troisième partie de bord (23c).
  5. Structure d'échangeur de chaleur qui a un groupe d'une pluralité d'échangeurs de chaleur (10 ; 10a, 10b) agencés dans une direction d'un écoulement d'air passant, les échangeurs de chaleur (10 ; 10a, 10b) comprenant :
    une pluralité de tubes (21) agencés dans une direction prédéterminée, les tubes (21) comprenant chacun une voie de passage (21a) à travers laquelle un réfrigérant s'écoule ; et
    une ailette ondulée (22) prévue entre des tubes (21) adjacents (21) parmi la pluralité de tubes (21), l'ailette (22) pouvant échanger la chaleur avec les tubes (21), dans laquelle :
    parmi les échangeurs de chaleur (10 ; 10a, 10b), celui disposé du côté le plus vent débout dans la direction de l'écoulement d'air (A) est l'échangeur de chaleur (10 ; 10a, 10b) selon l'une quelconque des revendications 1 à 4.
EP13888478.8A 2013-06-28 2013-06-28 Échangeur de chaleur, structure d'échangeur de chaleur, et ailette destinée à un échangeur de chaleur Active EP3015808B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/004041 WO2014207785A1 (fr) 2013-06-28 2013-06-28 Échangeur de chaleur, structure d'échangeur de chaleur, et ailette destinée à un échangeur de chaleur

Publications (3)

Publication Number Publication Date
EP3015808A1 EP3015808A1 (fr) 2016-05-04
EP3015808A4 EP3015808A4 (fr) 2016-07-27
EP3015808B1 true EP3015808B1 (fr) 2018-08-29

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EP13888478.8A Active EP3015808B1 (fr) 2013-06-28 2013-06-28 Échangeur de chaleur, structure d'échangeur de chaleur, et ailette destinée à un échangeur de chaleur

Country Status (3)

Country Link
EP (1) EP3015808B1 (fr)
JP (1) JPWO2014207785A1 (fr)
WO (1) WO2014207785A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11035623B2 (en) 2018-03-02 2021-06-15 Hitachi-Johnson Conrols Air Conditioning, Inc. Heat exchanger, outdoor unit, refrigeration cycle device, and heat exchanger manufacturing method

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018008134A1 (fr) * 2016-07-07 2018-01-11 三菱電機株式会社 Échangeur de chaleur
JP6758968B2 (ja) * 2016-07-14 2020-09-23 日立ジョンソンコントロールズ空調株式会社 熱交換器
EP3604974B1 (fr) 2017-03-27 2024-08-28 Daikin Industries, Ltd. Dispositif frigorifique
JP6766722B2 (ja) 2017-03-27 2020-10-14 ダイキン工業株式会社 熱交換器又は冷凍装置
EP3604996A4 (fr) 2017-03-27 2020-03-25 Daikin Industries, Ltd. Échangeur de chaleur et dispositif frigorifique
JP6766723B2 (ja) 2017-03-27 2020-10-14 ダイキン工業株式会社 熱交換器又は冷凍装置
JP6880901B2 (ja) 2017-03-27 2021-06-02 ダイキン工業株式会社 熱交換器ユニット
CN114641663B (zh) * 2019-11-11 2024-12-27 三菱电机株式会社 热交换器及制冷循环装置
US12163743B2 (en) 2019-11-11 2024-12-10 Mitsubishi Electric Corporation Heat exchanger, refrigeration cycle apparatus, method of manufacturing corrugated fin, and manufacturing apparatus for manufacturing corrugated fin
JP7756833B1 (ja) * 2024-03-21 2025-10-20 三菱電機株式会社 熱交換器及び空気調和装置
JP7675951B1 (ja) * 2024-03-21 2025-05-13 三菱電機株式会社 熱交換器及び空気調和装置

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JP2009270792A (ja) * 2008-05-09 2009-11-19 Sharp Corp 熱交換器

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Publication number Priority date Publication date Assignee Title
US11035623B2 (en) 2018-03-02 2021-06-15 Hitachi-Johnson Conrols Air Conditioning, Inc. Heat exchanger, outdoor unit, refrigeration cycle device, and heat exchanger manufacturing method

Also Published As

Publication number Publication date
EP3015808A1 (fr) 2016-05-04
EP3015808A4 (fr) 2016-07-27
JPWO2014207785A1 (ja) 2017-02-23
WO2014207785A1 (fr) 2014-12-31

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