EP0849558B1 - Aillette métallique pour un échangeur de chaleur - Google Patents

Aillette métallique pour un échangeur de chaleur Download PDF

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Publication number
EP0849558B1
EP0849558B1 EP97121211A EP97121211A EP0849558B1 EP 0849558 B1 EP0849558 B1 EP 0849558B1 EP 97121211 A EP97121211 A EP 97121211A EP 97121211 A EP97121211 A EP 97121211A EP 0849558 B1 EP0849558 B1 EP 0849558B1
Authority
EP
European Patent Office
Prior art keywords
lamellae
series
lamella
fin
downstream
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.)
Expired - Lifetime
Application number
EP97121211A
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German (de)
English (en)
French (fr)
Other versions
EP0849558A1 (fr
Inventor
Samy Bouzida
Mike V. Powers
Christophe Mignot
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.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9498815&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0849558(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0849558A1 publication Critical patent/EP0849558A1/fr
Application granted granted Critical
Publication of EP0849558B1 publication Critical patent/EP0849558B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F28F1/24—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
    • 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
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/454—Heat exchange having side-by-side conduits structure or conduit section
    • Y10S165/471—Plural parallel conduits joined by manifold
    • Y10S165/486—Corrugated fins disposed between adjacent conduits
    • Y10S165/487—Louvered

Definitions

  • the invention relates to
  • the metal fins used in heat exchangers brazed or assembled mechanically, to form exchange surfaces indirect intended to increase the areas of exchange between tubes in which a first fluid circulates hot or cold, and a second fluid, for example air, flowing between these tubes.
  • These fins are generally produced in the form of plates superimposed one above the other (exchanger mechanically assembled heat), and in this case they are crossed by the tubes, or bent substantially accordion (brazed heat exchanger) and in this case they are interposed between the tubes.
  • Some known fins include a central part provided with at least one series of fixed slats inclined with a constant angle, of selected shape, and spaced from each other others by openings of selected dimensions which allow the passage of fluid between the lamellae.
  • louvered fins are by example described in publication US-5,289,874.
  • louvers on the exchange surfaces indirect certainly increases heat exchange, but at the same time it increases the losses of which decrease the efficiency of the heat exchanger heat. This effect is all the greater as the number of superimposed fins is important. He can be further strengthened if the installation has several exchangers heaters connected in series.
  • louvered shutters of constant inclination are all the more favorable to large pressure losses as their inclination is large, which is generally the case in heat exchangers known heat where the fins have an inclination about 35 °.
  • Such angles cause detachment of the boundary layer in places where the fluid (e.g. air) begins its change of direction, and therefore, very weak areas are created near the walls so-called “air recirculation” and “dead water” speeds which, from a thermal point of view, are bad because convection can no longer occur normally.
  • the inclination of the slats of a group will be all the more great that the group order number will be high. So, the slats of a first group will present a first tilt whose value will be less than that of a second group, which will eventually be itself lower than that of a third group.
  • slats close to inclinations respective ones belong to two groups of slats whose serial numbers follow or precede each other.
  • a slide from the first group will be followed a lamella of the second group whose inclination is more important. Fluid direction changes vary thus gradually, and therefore more gently, which allows limit the separation of the boundary layer and therefore allow a larger indirect exchange area of to work.
  • some fins of the prior art comprise upstream of the first row of lamella a fixed upstream auxiliary lamella spaced from the first row of lamella by an opening of selected shape.
  • This auxiliary strip is intended to channel the fluid at the start of the series.
  • this upstream auxiliary strip generally has a length substantially equal to half the length of the strips of the series, which means that it does not straighten the fluid sufficiently.
  • the free end of the upstream auxiliary lamella is placed at a level lower than the respective levels of the lamellae of the series, which makes it possible to effectively straighten the fluid.
  • This fluid is then immediately well oriented and, on the one hand, the leading edges of the lamellae of the series are better approached, and on the other hand, the probability of separation of the boundary layer from the wall is significantly reduced. .
  • Certain fins of the prior art also include, downstream of the last row lamella, an auxiliary lamella fixed downstream spaced from the last row by an opening of selected shape.
  • This auxiliary lamella downstream is intended, like the upstream auxiliary lamella to channel the fluid at the end of the series.
  • this strip downstream auxiliary generally has a length substantially equal to half the length of the slats of the series, which means that it does not straighten the fluid.
  • the fin comprises at least two series of strips which follow one another (called respectively upstream series and downstream series), these can be connected together by means of the downstream auxiliary lamella of one and the upstream auxiliary lamella the other. This contributes to the pressure drop, and therefore improves the efficiency of the heat exchanger.
  • the auxiliary lamellae have an inclination less than or equal to that of the lamellae of the first group in the series. More preferentially, this inclination is less than that lamellae of the first group with a value between about 1 ° and about 20 °.
  • the series of lamellae neighbors have the same groups of lamellae.
  • groups of the same serial number of two series of neighboring lamellae present opposite directions. This subdivides the fluid in layers that will each penetrate between two slats of the upstream series and stand out in between corresponding lamellae of the downstream series placed symmetrically with respect to a median plane of symmetry.
  • the series of lamellae neighbors have different lamella groups.
  • the inclinations of the lamellae are included in a range from 15 ° to 35 °. Strong inclinations (typically greater than 30 °) no longer present any disadvantages, since their harmful influence on the fluid is compensated at least by the fact that we use slats different.
  • the inclination of the slats of the first group is less than that of slats of the group with the highest order number with a value between approximately 1 ° and approximately 15 °.
  • the invention applies more particularly to fins made of aluminum or an aluminum alloy, or still in copper.
  • the main purpose of a heat exchanger is to allow exchange of calories between a first fluid which circulates at the interior of some of these elements and a second fluid which circulates outside said elements.
  • the heat exchanger generally comprises tubes 1 the ends of which open into manifolds and in which the first fluid circulates, for example a refrigerant, and which are licked by the second fluid, for example air.
  • These fins are metallic, and preferably made of aluminum or aluminum alloy. They can be also made of copper.
  • the fins will take significantly different shapes.
  • the fins are made from a substantially folded plate accordion. They are then called dividers.
  • a interlayer thus includes a multiplicity of fins placed substantially parallel to each other, in a position perpendicular to the longitudinal axis tubes 1, and between two neighboring tubes 1, or between a end plate 3 and a tube 1.
  • the fins are flat plates in which are formed holes 4 allowing the passage of tubes 1.
  • the fin plates are superimposed one above the other, substantially parallel, in a plane perpendicular to the longitudinal axis tubes 1.
  • the fin it contains is preferably made in the form of one or more blinds.
  • Each louver is made in a central part 12 of the fin 1, and is made up of a series 6 of blades 7 which generally have identical chosen shapes and are separated from each other by openings 8, also of identical chosen shapes.
  • louvers in a fin, we start from a metal plate in which we come to make parallel and spaced cuts of a length L. Then, in appropriately shaping metal areas between two cuts, of width L, the strips 7 while forming the openings 8.
  • the fins of the prior art are fixed, and have all the same inclination with respect to a contained X-X axis in the plane of the fin and substantially perpendicular to the alignment of the slats 7 of a series 6.
  • the Applicant has noticed that the production of louvers with strips of constant inclination has a certain number of drawbacks, in particular with regard to pressure drops. This is why, according to the invention, the strips 7 of a series 6 have at least two different inclinations ⁇ 1 and ⁇ 2 .
  • a series 6 of strips therefore comprises at least two groups of identical fixed strips, each group having its own inclination.
  • the series 6-1 comprises a first group of four strips 7-1 of inclination ⁇ 1 , and a second group of three strips 7-2 of inclination ⁇ 2 .
  • the first row in a series (first strip from the left), as well as the lamella of the last row (last lamella of the series in starting from the left or first strip starting from the right), belong to the first group.
  • the series begins with two strips 7-1 of the first group, then it continues with three slats 7-2 of the second group, and finally it ends with two strips 7-1 from the first group.
  • the series of slats has a plane of symmetry, as is the case in the example illustrated on the Figure 3 where said plane of symmetry is placed substantially at center of the second strip 7-2 of the second group.
  • series 6-1 we subdivide the second fluid, which flows between the fins, in layers successive whose respective directions differ according to the angles of inclination of the slats between which they circulating. To the extent that the layers whose direction is slightly inclined precede the layers whose direction is more strongly inclined, the former will have tendency to press the seconds (following) against walls, thus contributing to significantly increase the exchange thermal fins (indirect exchange surfaces).
  • auxiliary lamellas 7 respectively an auxiliary lamella upstream 9 and an auxiliary downstream lamella 10 of the same width L than the 7-i slats in the series.
  • auxiliary lamellae are also made by cutting the central part 12 of the fin and are spaced from the lamella which precede or follow them by an opening 13 of dimensions chosen, which are in fact substantially equal to the dimensions an auxiliary lamella.
  • the free end 14 of auxiliary slats is placed at a lower level that the respective levels of the 7-i slats in the series that they frame, which makes it possible to straighten out effectively the second fluid at the entry and at the exit of the series, and therefore to better guide the flow of this second fluid.
  • the leading edges of each lamella, and in particular of the first strip in the 7-1 series are better addressed, thereby reducing the likelihood of delamination boundary layers which form on the constituent wall a fin.
  • the upstream 9 and downstream 10 auxiliary lamellae have an inclination Sprint 0 less than or equal to the inclination ⁇ 1 of the lamellae 7-1 of the first group. Even more preferably, the inclination ⁇ 0 of the auxiliary lamellae is about 1 ° to about 20 ° lower than the inclination ⁇ 1 .
  • a complete shutter then comprises a series 6 of strips 7 framed between two auxiliary strips 9 and 10.
  • the angle of inclination ⁇ i preferably increases while starting from the upstream auxiliary strip 9, at least up to the center of the series lamellae, then preferably preferentially decreases in a substantially symmetrical manner to the downstream auxiliary lamella 10. This makes it possible to soften even more the changes of direction imposed on the fluid, by further improving the efficiency of the heat exchanger.
  • a fin may have two series 6-1 and 6-2 of slats 7, or more, such as three, or four.
  • each fin for two series 6-1 and 6-2 of identical lamellae, but oriented in opposite directions.
  • a layer of second fluid which penetrates between, for example, two fins 7-1 of the first group of the first series 6-1 will naturally tend to come out between the two lamellae 7-1 of the second series 6-2, d 'tilt ⁇ 1 opposite, and placed symmetrically with respect to the YY axis.
  • the distance from the end of the first 6-1 series to the end of second series 6-2 is usually chosen from so as to allow direct circulation (arrow F3) of the second fluid between the couples made up, on the one hand, of the first strip 7-1 of the first series 6-1 and the downstream auxiliary lamella 10 of this same series 6-1, and on the other hand, the upstream auxiliary lamella 9 of the second series 6-2 and the first strip 7-1 of this second series 6-2.
  • the two downstream auxiliary blades 10 of the first series 6-1 and upstream 9 of the second series 6-2 are connected either directly to each other or by through a flat 11, as illustrated in the figure 3.
  • this flat is not essential. he depends in particular on the amplitude of the inclination of the auxiliary lamellae.
  • the difference tilt between two neighboring slats belonging to two groups of successive serial numbers is included between about 1 ° and 15 °, so that the changes in direction of the neighboring layers of second fluid be progressive.
  • the three angles of inclination chosen are thus, respectively, equal to 20 ° for ⁇ 0 , 24 ° for ⁇ 1 , and 28 ° for ⁇ 2 .
  • other tilt angle values can be envisaged depending on the configurations chosen.
  • FIG. 3 there is shown a fin with two sets of identical louvers, but opposite orientation relative to the Y-Y axis. Moreover, the different fins are superimposed one above the other others, substantially parallel to each other, and identical. We can however consider making fins asymmetrical, i.e. presenting series of non-identical slats. Likewise, the overlapping fins one above the other may be different between them, that is to say present one or more series with groups of fins with respective numbers of slats and the slopes are not identical from one fin to another.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Motor Or Generator Frames (AREA)
EP97121211A 1996-12-18 1997-12-03 Aillette métallique pour un échangeur de chaleur Expired - Lifetime EP0849558B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9615584 1996-12-18
FR9615584A FR2757259B1 (fr) 1996-12-18 1996-12-18 Ailette metallique perfectionnee pour echangeur de chaleur, notamment pour vehicule automobile

Publications (2)

Publication Number Publication Date
EP0849558A1 EP0849558A1 (fr) 1998-06-24
EP0849558B1 true EP0849558B1 (fr) 2003-04-16

Family

ID=9498815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97121211A Expired - Lifetime EP0849558B1 (fr) 1996-12-18 1997-12-03 Aillette métallique pour un échangeur de chaleur

Country Status (6)

Country Link
US (2) US6543527B1 (ja)
EP (1) EP0849558B1 (ja)
JP (1) JPH10185478A (ja)
DE (1) DE69720935T2 (ja)
ES (1) ES2200112T3 (ja)
FR (1) FR2757259B1 (ja)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI109432B (fi) * 1999-03-16 2002-07-31 Outokumpu Oy Lämmönvaihtimen jäähdytyselementti
JP2002277180A (ja) * 2001-03-16 2002-09-25 Calsonic Kansei Corp 一体型熱交換器のコア部構造
JP4521183B2 (ja) * 2001-06-21 2010-08-11 ベス・イスラエル・ディーコニス・メディカル・センター・インコーポレーテッド 組織および臓器移植の転帰を改善しかつアポトーシスを抑制する一酸化炭素
KR20030020563A (ko) * 2001-09-01 2003-03-10 한라공조주식회사 열교환기용 루버 핀
US6805193B2 (en) * 2002-01-24 2004-10-19 Valeo, Inc. Fin louver design for heat exchanger
US20050045314A1 (en) * 2004-08-26 2005-03-03 Valeo, Inc. Aluminum heat exchanger and method of making thereof
DE102004012427A1 (de) * 2004-03-13 2005-09-29 Modine Manufacturing Co., Racine Wärmetauschernetz und Wellrippe
US20070051502A1 (en) * 2004-05-19 2007-03-08 Showa Denko K.K. Heat exchanger fin, heat exchanger, condensers, and evaporators
FR2886393A1 (fr) * 2005-05-27 2006-12-01 Edestec Sarl Ailette pour echangeur de chaleur comportant des ailettes secondaires situees sur des lamelles inclinees
US20070240865A1 (en) * 2006-04-13 2007-10-18 Zhang Chao A High performance louvered fin for heat exchanger
US20070246202A1 (en) * 2006-04-25 2007-10-25 Yu Wen F Louvered fin for heat exchanger
US20080142202A1 (en) * 2006-12-15 2008-06-19 Valeo, Inc. High strength fin louver design
JP4674602B2 (ja) * 2007-11-22 2011-04-20 株式会社デンソー 熱交換器
DE102011004306A1 (de) * 2011-02-17 2012-08-23 Behr Gmbh & Co. Kg Rippe für einen Wärmeübertrager
JP5257485B2 (ja) * 2011-05-13 2013-08-07 ダイキン工業株式会社 熱交換器
GB2497130A (en) * 2011-12-02 2013-06-05 Smith S Environmental Products Ltd Radiator fin having at least two offset apertures
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
JP6160111B2 (ja) * 2013-02-18 2017-07-12 株式会社デンソー 熱交換器
DE112014000871T5 (de) 2013-02-18 2015-12-17 Denso Corporation Wärmetauscher und Herstellungsverfahren desselben
JP6028612B2 (ja) * 2013-02-18 2016-11-16 株式会社デンソー 熱交換器およびその製造方法
JP6333571B2 (ja) * 2014-02-10 2018-05-30 三菱重工オートモーティブサーマルシステムズ株式会社 熱交換器用オフセットフィンおよびそれを用いた冷媒熱交換器
US10209012B2 (en) * 2015-02-24 2019-02-19 Lgl France Heat exchanger with louvered fins
JP6327271B2 (ja) * 2015-04-17 2018-05-23 株式会社デンソー 熱交換器
CA3036460A1 (en) 2018-03-14 2019-09-14 Rheem Manufacturing Company Heat exchanger fin
USD906268S1 (en) 2018-09-11 2020-12-29 Rheem Manufacturing Company Heat exchanger fin
US11326842B2 (en) * 2018-09-21 2022-05-10 Samsung Electronics Co., Ltd. Heat exchanger and air conditioner having the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289874A (en) * 1993-06-28 1994-03-01 General Motors Corporation Heat exchanger with laterally displaced louvered fin sections

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3250325A (en) * 1963-02-19 1966-05-10 Ford Motor Co Heat exchange device
JPH02238297A (ja) * 1989-03-08 1990-09-20 Nippondenso Co Ltd 熱交換器の設計方法及び評価方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289874A (en) * 1993-06-28 1994-03-01 General Motors Corporation Heat exchanger with laterally displaced louvered fin sections

Also Published As

Publication number Publication date
FR2757259B1 (fr) 1999-03-05
FR2757259A1 (fr) 1998-06-19
DE69720935T2 (de) 2004-03-11
JPH10185478A (ja) 1998-07-14
ES2200112T3 (es) 2004-03-01
EP0849558A1 (fr) 1998-06-24
DE69720935D1 (de) 2003-05-22
US20030079868A1 (en) 2003-05-01
US6543527B1 (en) 2003-04-08

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