EP2236972B1 - Ailette pour échangeur thermique et échangeur thermique utilisant l'ailette - Google Patents

Ailette pour échangeur thermique et échangeur thermique utilisant l'ailette Download PDF

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Publication number
EP2236972B1
EP2236972B1 EP10003134.3A EP10003134A EP2236972B1 EP 2236972 B1 EP2236972 B1 EP 2236972B1 EP 10003134 A EP10003134 A EP 10003134A EP 2236972 B1 EP2236972 B1 EP 2236972B1
Authority
EP
European Patent Office
Prior art keywords
louvers
fin
heat exchanger
louver
louver gap
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
EP10003134.3A
Other languages
German (de)
English (en)
Other versions
EP2236972A2 (fr
EP2236972A3 (fr
Inventor
Liu Huazhao
Lin-Jie Huang
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.)
Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd
Danfoss AS
Original Assignee
Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd
Danfoss AS
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.)
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Publication date
Application filed by Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd, Danfoss AS filed Critical Sanhua Hangzhou Micro Channel Heat Exchanger Co Ltd
Publication of EP2236972A2 publication Critical patent/EP2236972A2/fr
Publication of EP2236972A3 publication Critical patent/EP2236972A3/fr
Application granted granted Critical
Publication of EP2236972B1 publication Critical patent/EP2236972B1/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
    • 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
    • F28F1/128—Fins with openings, e.g. louvered 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
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/006—Preventing deposits of ice
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2260/00—Heat exchangers or heat exchange elements having special size, e.g. microstructures
    • F28F2260/02—Heat exchangers or heat exchange elements having special size, e.g. microstructures having microchannels

Definitions

  • the present invention relates to a heat exchanger, and more particularly to a fin used with a heat exchanger.
  • JPH08178366 discloses a fin for a heat exchanger with the features of the preamble of claim 1.
  • a heat exchanger is a commonly used component in refrigeration system and air conditioning system, and can be classified as a condenser, an evaporator and so on based on its functions. To improve the heat exchanging performance of a heat exchanger, among others, the heat exchanger is generally provided with a fin.
  • Figs. 1A and 1B show a conventional fin used with a heat exchanger
  • Fig. 1A is a plan view of the fin
  • Fig. 1B is a sectional view taken along line B-B in fig. 1A .
  • a fin is made of a material with a high thermal conductivity such as aluminium alloy, and is formed by processing an aluminium alloy sheet.
  • the fin contacts a surface of the heat exchanger, such as a surface of a flat tube, such that thermal conduction is achieved between the fin and the flat tube.
  • the fin conducts heat exchange with external medium flowing over the fin, and thus achieving the heat exchange between the heat exchanger and the external medium.
  • the fin 1 is formed with louvers 20, the louvers can be divided into two sets-a leading set and a trailing set in the flowing direction of the medium such as air, which is in the left-right direction in fig. 1B .
  • the louver pattern of the conventional fin is completely symmetrical, specifically, the louver gap and tilt angle of the leading set of louvers are identical with the louver gap and tilt angle of the trailing set of louvers.
  • the flowing air flows through the leading set of louvers first, and then the trailing set of louvers.
  • the object of invention is to solve the problems associated with the conventional fin, and provides a fin for a heat exchanger which can improve the heat exchange performance of the heat exchanger, especially when frost forms on the fin.
  • Another object of the invention is to provide a heat exchanger provided with a fin in accordance with the invention.
  • a fin for a heat exchanger with the features of claim 1.
  • a heat exchanger which comprises a fin as defined in the first aspect of the invention.
  • the heat exchanger is a microchannel heat exchanger.
  • the louver gap at a certain portion of the louvers is made to match with the amount of frost formed at that portion, such that a sufficient space is still left between adjacent louvers for the air to flow through.
  • the wind resistance will not increase substantially to decrease the amount of air flowing through, and thus the heat exchange performance of the fin can be utilized completely.
  • the fin used for a heat exchanger according to the invention will be described in detail below. It should be noted that the embodiments of the invention are only illustrative, they are only used to describe the principle of the invention but not to limit the invention. Furthermore, it is obvious to one skilled in the art that the fin according to the invention can be used with various heat exchangers which use a fin, including a microchannel heat exchanger.
  • the area between two adjacent louvers, through which air flows, depends on a distance between the two adjacent louvers measured in a line perpendicular to the two louvers, i.e. the louver gap.
  • the present invention takes into consideration the difference of the frost-forming condition between the leading set and the trailing set of the louvers, and the difference of the frost-forming condition at different portions of the leading set and the trailing set in the air flow direction, and provides a louver pattern that can prevent the heat exchanging performance of a heat exchanger from degrading when frost forms on the fin.
  • the pitch of the louvers decreases gradually in the air flow direction, and the tilt angle of the louvers remains constant, such that the louver gap d of the louvers decreases gradually in the air flow direction, i.e. dl>d2>d3>d4>d5>d6>d7>d8, as schematically shown in fig.2 .
  • Fig.3 shows the fin not forming part of the invention
  • the pitch between adjacent louvers in the leading set of the louvers is set to a first pitch
  • the pitch between the adjacent louvers in the trailing set of louvers is set to a second pitch which is smaller the first pitch
  • the tilt angle of all the louvers remains constant, such that the leading set of louvers has a first uniform louver gap D1, and the trailing set of louvers has a second uniform louver gap D2, and the first louver gap D1 is larger than the second louver gap D2, as shown in fig. 3 .
  • Fig.4 shows the fin not forming part of the invention.
  • the tilt angle ⁇ of the louvers is made to decrease gradually in the air flow direction, i.e. ⁇ 1> ⁇ 2> ⁇ 3> ⁇ 4> ⁇ 5> ⁇ 6> ⁇ 7> ⁇ 8 and the louver pitch between the adjacent louvers of the louvers remains constant, so that the louver gap between the adjacent louvers of the louvers decreases gradually, as shown in fig.4 .
  • Fig.4 shows the fin in accordance with the invention.
  • the fin in accordance with the invention adopts a solution as follows.
  • the tilt angle of the louvers in the leading set of louvers is set to a first tilt angle ⁇ 1
  • the angle of the louvers in the trailing set of louvers is set to a second tilt angle ⁇ 2 which is smaller the first tilt angle ⁇ 1
  • a uniform pitch is provided between adjacent louvers, such that the leading set of louvers have a first uniform louver gap and the trailing set of louvers have a second uniform louver gap, and the first louver gap is larger than the second louver gap, as shown in fig. 5 .
  • the louver gap of the leading set of louvers and the louver gap of the trailing set of louvers are made to match respectively with the amount of frost formed at the leading set and the trailing set: the frost forms more at the leading set of louvers, and accordingly the louver gap of the leading set of louvers is relatively large; and the frost forms less at the trailing set of louvers, and accordingly the louver gap of the trailing set of louvers is relatively small.
  • louver gap of the louvers is relatively large at the leading set of louvers where the frost forms more, and thus can accommodate more frost. Accordingly, even at the leading set of louvers where the frost forms more, enough space is still left between adjacent louvers for the air to flow through.
  • a fin in accordance with the invention With a fin in accordance with the invention, at the leading set, since the louvers have a relatively large tilt angle, and the density of the louvers does not decrease even if a large louver gap is provided, a good heat exchange performance is achieved. And furthermore, since a large louver gap is provided at the leading set, the amount of air flowing through will not be substantially decreased when frost forms, and thus the heat exchange performance of the fin is completely utilized. And furthermore, with the fin in accordance with the invention, since the leading set of louvers has a uniform tile angle and so does the trailing set of louvers, the fin can be relatively easily manufactured as compared with the fin of the third embodiment.
  • the louver gap between adjacent louvers at a certain portion of the louvers is made to match with the amount of frost formed there, such that a sufficient space is still left between any two adjacent louvers for the air to flow through when frost forms on the louvers.
  • the wind resistance will not increase substantially to decrease the amount of air flowing through, thus the heat exchange performance of the fin is utilized completely.
  • the louvers are divided into a leading set and a trailing set in the air flow direction, and each set has a uniform louver gap.
  • the present invention is not limited to this, and various changes can be made based on the principle of the invention e.g.:
  • louvers are divided into a leading set and a trailing set in the air flow direction in the above embodiments, but it is obvious to one skilled in the art that the louvers can be divided into a number of sets in the air flow direction in some other ways.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Air-Flow Control Members (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (3)

  1. Ailette (1) pour échangeur thermique ayant une direction d'écoulement d'air pour de l'air, qui est utilisée en tant que support d'échange thermique lorsque l'échangeur thermique fonctionne, ladite ailette étant formée avec des évents (20) agencés successivement dans la direction d'écoulement d'air,
    dans lequel lesdits évents sont divisés en un jeu avant qui est situé en amont et un jeu arrière qui est situé en aval dans la direction d'écoulement d'air,
    dans lequel le jeu d'évents avant a un premier espace d'évents uniforme et constant, le jeu d'évents arrière a un second espace d'évents uniforme et constant, et le premier espace d'évents est plus grand que le second espace d'évents,
    dans lequel l'angle d'inclinaison du jeu avant est plus grand que l'angle d'inclinaison du jeu arrière, caractérisé en ce que lesdits jeux ont un pas uniforme de telle sorte qu'un espace d'évents à une certaine portion des évents correspond à une quantité de gel formé sur ladite portion.
  2. Échangeur thermique comportant une ailette selon la revendication 1.
  3. Échangeur thermique selon la revendication 2, dans lequel ledit échangeur thermique est un échangeur thermique à micro-canaux.
EP10003134.3A 2009-03-25 2010-03-24 Ailette pour échangeur thermique et échangeur thermique utilisant l'ailette Active EP2236972B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200910119662XA CN101846479B (zh) 2009-03-25 2009-03-25 用于换热器的翅片以及采用该翅片的换热器

Publications (3)

Publication Number Publication Date
EP2236972A2 EP2236972A2 (fr) 2010-10-06
EP2236972A3 EP2236972A3 (fr) 2014-03-05
EP2236972B1 true EP2236972B1 (fr) 2020-09-30

Family

ID=42263709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10003134.3A Active EP2236972B1 (fr) 2009-03-25 2010-03-24 Ailette pour échangeur thermique et échangeur thermique utilisant l'ailette

Country Status (3)

Country Link
US (1) US20100243226A1 (fr)
EP (1) EP2236972B1 (fr)
CN (1) CN101846479B (fr)

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CN101839592B (zh) * 2010-05-19 2013-05-29 三花控股集团有限公司 换热器
JP5753725B2 (ja) * 2011-04-26 2015-07-22 株式会社ティラド コルゲートフィン型熱交換器
JP5257485B2 (ja) * 2011-05-13 2013-08-07 ダイキン工業株式会社 熱交換器
CN102519293A (zh) * 2011-09-26 2012-06-27 郑州大学 一种新型百叶窗翅片
JP5803768B2 (ja) * 2012-03-22 2015-11-04 株式会社デンソー 熱交換器用フィンおよび熱交換器
CN102735090A (zh) * 2012-07-06 2012-10-17 海信科龙电器股份有限公司 一种空调换热器用换热翅片
CN105783139A (zh) * 2012-08-08 2016-07-20 三菱电机株式会社 热交换器的制造方法和空调机的制造方法
KR20150094954A (ko) * 2014-02-12 2015-08-20 엘지전자 주식회사 열교환기
KR102203435B1 (ko) * 2014-07-17 2021-01-14 엘지전자 주식회사 열교환기 및 그를 갖는 히트펌프
DE102014222851A1 (de) * 2014-11-10 2016-05-12 BSH Hausgeräte GmbH No-Frost-Kältegerät
JP6327271B2 (ja) * 2015-04-17 2018-05-23 株式会社デンソー 熱交換器
DE102015226577A1 (de) * 2015-12-22 2017-06-22 Mahle International Gmbh Blechteil mit einer Kiemen aufweisenden Rippenstruktur eines Wärmeübertragers sowie Herstellungsverfahren
US11073342B2 (en) * 2016-06-01 2021-07-27 Denso Corporation Regenerative heat exchanger
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JP2018132247A (ja) * 2017-02-15 2018-08-23 富士電機株式会社 自動販売機
FR3082295B1 (fr) * 2018-06-11 2020-07-03 Valeo Systemes Thermiques Echangeur de chaleur de vehicule automobile
CN111912279B (zh) * 2020-08-13 2021-05-07 西安交通大学 一种扭转曲折百叶窗翅片

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Also Published As

Publication number Publication date
EP2236972A2 (fr) 2010-10-06
CN101846479A (zh) 2010-09-29
EP2236972A3 (fr) 2014-03-05
US20100243226A1 (en) 2010-09-30
CN101846479B (zh) 2012-02-22

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