WO2006055916A2 - Tube echangeur de chaleur et procede de formation associe - Google Patents

Tube echangeur de chaleur et procede de formation associe Download PDF

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Publication number
WO2006055916A2
WO2006055916A2 PCT/US2005/042183 US2005042183W WO2006055916A2 WO 2006055916 A2 WO2006055916 A2 WO 2006055916A2 US 2005042183 W US2005042183 W US 2005042183W WO 2006055916 A2 WO2006055916 A2 WO 2006055916A2
Authority
WO
WIPO (PCT)
Prior art keywords
tube
fin
heat exchanger
heat transfer
cross
Prior art date
Application number
PCT/US2005/042183
Other languages
English (en)
Other versions
WO2006055916A3 (fr
Inventor
Allan Stikeleather
Edward R. Stikeleather
Original Assignee
Allan Stikeleather
Stikeleather Edward R
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Allan Stikeleather, Stikeleather Edward R filed Critical Allan Stikeleather
Publication of WO2006055916A2 publication Critical patent/WO2006055916A2/fr
Publication of WO2006055916A3 publication Critical patent/WO2006055916A3/fr

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/26—Making finned or ribbed tubes by fixing strip or like material to tubes helically-ribbed tubes
    • 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
    • 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
    • F28F1/34—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 obliquely
    • F28F1/36—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 obliquely the means being helically wound fins or wire spirals
    • 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
    • F28F2215/08—Fins with openings, e.g. louvers

Definitions

  • the present disclosure relates to heat exchanger tubes, and, in particular to heat exchanger tube having a fin or fins disposed on a surface thereof.
  • Heat exchanger tubes may include a metallic tube with a fin wound helically around an exterior surface thereof.
  • the tube may have a circular cross- section and the fin may be a solid construction and integral with, or secured to, the outer surface of the tube.
  • heat applied to a bottom half of a tube may more directly heat the bottom of the tube than the top of the tube. This results in inefficient heat transfer for the tube and a heat exchanger including the tube.
  • FIG. 1 is radial cross-section of an embodiment of a heat exchanger tube including a fin consistent with the present invention
  • FIG. 2 is an axial (lengthwise) cross-sectional view an embodiment of a heat exchanger tube consistent with the present invention showing a fin disposed on a. top exterior surface thereof;
  • FIG. 3 is radial cross-section of an embodiment of a heat exchanger tube consistent with and embodiment of the present invention;
  • FIG. 4 is a perspective view of an embodiment of an initial heat exchanger tube assembly
  • FIG. 5 is a radial cross-section of another embodiment of a heat exchanger tube assembly consistent with the present invention
  • FIG. 6 is a representational illustration of a shape alteration operation consistent with the present invention.
  • FIG. 7 representationally depicts the regions of induced stress in an embodiment of a heat exchanger tube assembly consistent with the present invention.
  • FIG. 8 illustrates relief cuts which may be made in the fins of an initial heat exchanger tube assembly to mitigate buckling of the fins.
  • FIG L is a cross-sectional view of one exemplary embodiment 100 of a heat exchanger consistent with the present invention.
  • the illustrated exemplary embodiment includes a tube 102 and a fin 104.
  • the fin 104 may be attached to an exterior surface 106 of the tube 102 and may be wound helically thereon.
  • the heat exchanger 100 may advantageously be used in connection with a heat exchange system to provide heat transfer between a first heat transfer medium disposed within and/or circulating within the tube 102 and a second heat transfer medium moving or flowing over and/or around the heat exchanger 100.
  • the flow of the second heat transfer medium over and/or around the heat exchanger 100 is indicated by arrows 114.
  • convective heat transfer may occur between the first heat transfer medium within the tube 102 and the second heat transfer medium moving or flowing over and/or around the heat exchanger 100.
  • the first heat transfer medium and the second heat transfer medium may be fluid heat transfer mediums, such as gasses, liquids, etc.
  • the first heat transfer medium within the tube may be different than the second heat transfer medium moving or flowing over and/or around the heat exchanger 100.
  • a bottom portion 108 of the fin 104 i.e., a portion of the fin 104 in an upstream position relative to the second heat transfer medium, is of solid construction, i.e. with no openings, serrations or vanes between an interior edge of the fin and an exterior edge of the fin.
  • a top portion 110 of the fin 104 i.e., a portion of the fin 104 in a downstream position relative to the flow 114 of the second heat transfer medium, however, may include a one or more vanes 112 extending from a surface thereof for directing the second heat transfer medium flowing around and/or over the heat exchanger 100.
  • the second heat transfer medium may be directed by the vanes 112 to flow along the exterior surface of the tube.
  • the second heat transfer medium may have an upstream flow 114a that may be generally perpendicular to the axis of the tube 102.
  • the upstream flow 114a may be incident on the bottom portion 108 of the fin 104 and of the tube 102.
  • the downstream flow 114b of the second heat transfer medium may be directed around the tube 102 and the upper portion 110 of the fin 104 by the vanes 112.
  • the vanes 112 may increase and/or prolong the effective interaction between the tube 102, fin 104, and second heat transfer medium flowing around the heat exchanger 100.
  • the vanes may direct the flow of heat transfer medium, e.g., a heated gas emanating from the bottom of the tube, against the top portion of the exterior tube surface 106, as indicated by arrows 114b.
  • the second heat transfer medium may be applied more evenly to the top and bottom portions of the tube and the fin, thereby increasing efficiency heat transfer.
  • directing the flow of the second heat transfer medium across the top portion of the tube and fin may increase the surface area of the fin and tube contacted by a flow the second heat transfer media effective for transferring heat between the first and second heat transfer mediums.
  • FIG. 2 an axial sectional view of a portion of a heat exchanger tube consistent with the present invention is shown.
  • the vane 112 on the top portion of the fin 110 may be formed as a flap 116 extending outwardly from the body 11 S of the fin 104.
  • Vanes 112 of such a configuration may be formed by stamping, die forming, etc.
  • the fin may be integrally formed with the tube and/or may be a separate component which may be coupled to the tube, e.g., by brazing, welding, swaging, interference fit, etc.,
  • the vanes may be formed in the fin before, during, or after the fin is coupled to the tube.
  • the vanes may be provided in a variety of configurations depending on the requirements of the application.
  • the vanes 112 may be provided solely on the top half of the fin 104, or may extend at least partially into the bottom half of the tube.
  • the vanes 112 may be provided in a variety of patterns for directing flow of gas against the tube.
  • the illustrated exemplary embodiments are, therefore, provided by way of example, not of limitation.
  • FIG. 3 illustrates another exemplary embodiment of a heat exchanger tube assembly 300 consistent with the present invention.
  • the tube 302 has a generally triangular or trapezoidal cross-section with fins 304 disposed on the side surfaces thereof.
  • the fins may extend about 0.5 inches from the exterior surface of the tube, and the inside diameter of the tube may be about 1 inch.
  • a first heat transfer medium may be disposed within and/or circulate or pass though the tube 302.
  • a second heat transfer medium may surround and/or flow over or around the heat exchanger tube assembly 300 for transferring heat between the first and second heat transfer medium.
  • the first and second heat transfer mediums may include fluid heat transfer mediums, such as liquids and/or gasses, etc.
  • a heat exchanger tube assembly 300 consistent with the illustrated embodiment may present a portion of an exterior surface 305 exposed directly to a flow of the second heat transfer medium, indicated by arrows 306.
  • the portion of the exterior surface 305 exposed directly to the flow of the second heat transfer medium 306 may be directly impinged by the flow of the second heat transfer medium.
  • the second heat transfer medium impinging an upstream portion of the exterior surface 305 of the tube 302 may flow downstream along and/or in contact with the portion of exterior surface 305 of the tube 302 which is exposed directly to the flow 306 of the second heat transfer medium. Impingement and/or flow of the second heat transfer medium along the exterior surface 305 and/or across the fins 304 may affect heat transfer between the first and second heat transfer mediums.
  • a heat exchanger tube assembly 300 herein may exhibit improved heat transfer efficiency, relative to, for example, a tube having a circular cross-section.
  • the increased heat transfer efficiency may, at least in part, be achieved by presenting a longer exterior surface exposed directly to the flow 306 of the second heat transfer medium, e.g., as compared to a tube of circular cross-section having a similar cross-sectional area.
  • only the top portion of the illustrated tube 302 may generally be not exposed directly to the flow 306 of the second heat transfer medium, as compared with nearly half of a circular cross-section tube which may not be directly exposed, i.e., the downstream half of the circular cross-section tube.
  • the generally flat exterior surfaces of the tube 302 facilitate attachment of the fins 304 to the tube 302.
  • the tube 302 and fins 304 may be constructed using equipment and techniques known in the art.
  • the fins 304 may be formed from a sheet or strip material.
  • the fins 304 may be affixed to the generally flat exterior surfaces of the tube 302 by welding, brazing, or other suitable methods.
  • the fins may be integrally formed with the tube.
  • the fins may be secured to the exterior surface of the tube either perpendicularly to the major axis of the tube, or at an angle, e.g. 45 degrees, thereto.
  • the fins 304 on one or both sides of the tube may include one or more vanes disposed thereon, e.g., as described above with reference to FIGS. 1 and 2.
  • vanes may further direct and/or encourage the flow of the second heat transfer medium against or along the exterior surface of the tube. Additionally, vanes may, at least to some degree, promote and/or increase flow of the second heat transfer medium along at least a portion of the exterior surface of the tube which is not exposed directly to the flow of the second heat transfer medium.
  • FIGS. 4 through 8 an exemplary method of forming a heat exchanger tube assembly consistent with one aspect of the present invention is illustrated. In general, heat transfer between a first heat transfer medium within and/or flowing through a heat exchanger tube and a second heat transfer media surrounding and/or flowing over or around the heat exchanger tube may be improved by altering the shape of the heat exchanger tube to increase the exterior surface of the tube exposed directly to the flow of the second heat transfer media.
  • an initial heat exchanger tube assembly 400 may generally include a tube 402 including a helically arranged fin 404 coupled to the exterior surface 406 of the tube 402.
  • the fin 404 may be a separate component which may be attached to the exterior surface 406 of the tube 402, e.g., by welding, brazing, swaging into a groove in the tube, etc.
  • the fin may be integrally formed with the tube.
  • the flow, indicated by arrows 408, of the second heat transfer medium may generally directly contact only about one half of the exterior surface 406 of the tube.
  • the downstream portion of the tube 402 may be shielded, to varying degrees, from the direct flow 408 of the second heat transfer medium, thus reducing the heat transfer in the shielded region of the tube.
  • the shape of the heat exchanger tube assembly 400 may be altered to provide a modified heat exchanger tube assembly 400.
  • the round tube 402 with fins 404 may be modified to provide a tube 402a having different, unequal length cross-sectional axes AB, CD.
  • the modified tube 402 a may have a generally triangular or trapezoidal cross- sectional shape.
  • the modified tube 402a may, as such, exhibit an increased tube exterior surface 406a more directly exposed to the flow 408 of the second heat transfer media in a direction generally parallel to the longer altered tube axis AB.
  • Heat transfer may be increased as a result of the additional tube exterior surface being more directly exposed to the flow 408 of the second heat transfer media generally parallel to this altered, longer tube/fin axes AB.
  • Modified cross-sectional shapes other than the generally triangular or trapezoidal cross-sectional shape, may also suitably provide an increased exterior surface that is more directly exposed to the flow of the second heat transfer medium.
  • one method of altering a round helically finned tube 402 may involve exerting a pressure on each of generally opposed sides of the tube 402. The pressure may compress, or otherwise deform, the tube 402, and/or the fins 404, to increase one cross- sectional axis and/or decrease the other cross-sectional axis of the tube 402.
  • the pressure to deform the tube 402 may be applied to the tube 402 via members configured to contact the tube 402 in between adjacent turns of the helically disposed fin 404.
  • appropriate edgewise pressure may be applied through a plurality of appropriately configured strips 410, 412.
  • the strips 410, 412 maybe generally aligned at right angles to the main axis of the tube 402 and may be of appropriate strength material, and dimensions to allow the strips 410, 412 to be fitted and properly aligned with each other in the space between adjacent helical fin 404 prior to applying pressure on opposite sides of the finned portion of the tube 402 areas requiring alteration.
  • forming blocks may be employed.
  • the forming block may extend along at least a portion of the length of the tube and may include slots configured to at least partially receive respective portions of the helically wound fin.
  • the strips 410, 412 may in some embodiments, at least in part, control the changing geometry of the helical fin 404 resulting from the altered geometry of the tube compressing operation.
  • compressing the walls of the round helically finned tube 402 to achieve the desired altered shape may produce corresponding deformation of the fins 404, if they are securely attached to the tube 402 and must, therefore, move to conform to the altered geometry of the tube 402a.
  • the movement of the fins to conform to the altered geometry of the tube 402a may induce stresses in the fins 404a.
  • Tensile stresses may be induced in the fins at around each end of the longer axis of the alter shape, as designated by T in FIG. 7, due to the changed radius relative to the original tube geometry.
  • tensile compressive stresses may be induced in the fins 404a along the opposing flattened tube wall portions, designated by C in FIG. 7, due to the flattening of the tube wall under the fins 404a.
  • the strips 410, 412 which apply pressure to alter the geometry of the tube 402 may also apply a compressive force to the fins 404 to control buckling of the fins 404a after deformation of the tube. Additionally, the strips 410, 412 may apply a force to the fins to stabilize the position of the fins to maintain the fin alignment during the tube shape alteration.
  • buckling of the fins may be, at least in part, controlled by selectively removing portions 414, 416, 418, 420 of the fins 404, e.g., by providing relief cuts, prior to alteration of the shape.
  • the removed portions 414, 416, 418, 420 may allow the expansion of the regions of the fins 404a exhibiting induced compressive stress C without buckling.
  • the size and placement of the removed portions 414, 416, 418, 420 of the helical fin 404 maybe coordinated such that the gaps may generally close-up when the shape of the tube is altered.
  • Alteration of a finned tube shape as described herein may cause a corresponding reduction in the cross section area and/or hydraulic and/or equivalent diameter when a round tube is deformed in accordance with this invention.
  • the reduction may increase the pressure drop through the tube.
  • conversion from a round helically finned tube to a shaped finned tube in order to increase the heat transfer may require larger starting round finned tube diameters to compensate for increased pressure drop resulting from the change in shape.
  • a heat exchanger assembly including a tube configured to carry a first heat exchange medium.
  • a fin may be coupled to at least a portion of the tube.
  • the fin may include at least one vane extending from a surface thereof.
  • the vane may be configured to direct a flow of a second heat exchange medium against the tube.
  • a heat exchanger assembly including a tube having trapezoidal or triangular cross-sectional shape.
  • the heat exchanger assembly may also include a fin attached to the tube.
  • a method for forming a heat exchanger assembly generally includes providing a tube and providing a helical fin coupled to the tube. The method may further include deforming the tube to provide a generally trapezoidal or triangular cross-sectional shape.

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

Abstract

L'invention concerne un ensemble échangeur de chaleur qui comprend un tube conçu pour porter un premier milieu d'échange de chaleur et une ailette raccordée à au moins une partie du tube. Au moins une aube est formée dans ladite ailette. L'aube est conçue pour diriger l'écoulement d'un deuxième milieu de transfert de chaleur contre le tube.
PCT/US2005/042183 2004-11-18 2005-11-18 Tube echangeur de chaleur et procede de formation associe WO2006055916A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US62947604P 2004-11-18 2004-11-18
US60/629,476 2004-11-18
US63040604P 2004-11-23 2004-11-23
US60/630,406 2004-11-23
US64613405P 2005-01-21 2005-01-21
US60/646,134 2005-01-21

Publications (2)

Publication Number Publication Date
WO2006055916A2 true WO2006055916A2 (fr) 2006-05-26
WO2006055916A3 WO2006055916A3 (fr) 2006-08-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/042183 WO2006055916A2 (fr) 2004-11-18 2005-11-18 Tube echangeur de chaleur et procede de formation associe

Country Status (1)

Country Link
WO (1) WO2006055916A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011558A1 (de) * 2007-12-12 2009-06-18 GEA MASCHINENKüHLTECHNIK GMBH Wärmetauscher
JPWO2014050418A1 (ja) * 2012-09-26 2016-08-22 株式会社Uacj 空気調和機用フィン・アンド・チューブ型熱交換器
KR20200097242A (ko) * 2017-12-22 2020-08-18 상하이 파워 이큅먼트 리서치 인스티튜트 컴퍼니 리미티드 아우터 핀 열교환 튜브 및 그 사용방법
RU2795639C1 (ru) * 2022-03-04 2023-05-05 федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технологический университет" (ФГБОУ ВО "КНИТУ") Секционный радиатор, содержащий винтовой тепловой мост

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227572A (en) * 1978-03-27 1980-10-14 Seton-Scherr, Inc. Finned tubing
EP0102407A1 (fr) * 1982-09-03 1984-03-14 Wieland-Werke Ag Tube à ailettes avec protubérances internes et procédé et dispositif de fabrication
US4997036A (en) * 1987-11-03 1991-03-05 Gea Luftkuhlergesellschaft Happel Gmbh & Co. Heat exchanger tube
US5467816A (en) * 1993-02-08 1995-11-21 Larinoff; Michael W. Finned tubes for air-cooled steam condensers
US6789317B1 (en) * 2003-06-17 2004-09-14 Bechtel Bwxt Idaho, Llc Finned tube with vortex generators for a heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227572A (en) * 1978-03-27 1980-10-14 Seton-Scherr, Inc. Finned tubing
EP0102407A1 (fr) * 1982-09-03 1984-03-14 Wieland-Werke Ag Tube à ailettes avec protubérances internes et procédé et dispositif de fabrication
US4997036A (en) * 1987-11-03 1991-03-05 Gea Luftkuhlergesellschaft Happel Gmbh & Co. Heat exchanger tube
US5467816A (en) * 1993-02-08 1995-11-21 Larinoff; Michael W. Finned tubes for air-cooled steam condensers
US6789317B1 (en) * 2003-06-17 2004-09-14 Bechtel Bwxt Idaho, Llc Finned tube with vortex generators for a heat exchanger

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008011558A1 (de) * 2007-12-12 2009-06-18 GEA MASCHINENKüHLTECHNIK GMBH Wärmetauscher
DE102008011558B4 (de) * 2007-12-12 2010-04-01 GEA MASCHINENKüHLTECHNIK GMBH Wärmetauscher
JPWO2014050418A1 (ja) * 2012-09-26 2016-08-22 株式会社Uacj 空気調和機用フィン・アンド・チューブ型熱交換器
KR20200097242A (ko) * 2017-12-22 2020-08-18 상하이 파워 이큅먼트 리서치 인스티튜트 컴퍼니 리미티드 아우터 핀 열교환 튜브 및 그 사용방법
EP3702712A4 (fr) * 2017-12-22 2020-12-09 Shanghai Power Equipment Research Institute Co., Ltd. Tube d'échange de chaleur à ailettes externes et procédé d'utilisation associé
US11118847B2 (en) 2017-12-22 2021-09-14 Shanghai Power Equipment Research Institute Co., Ltd. Finned heat exchanger tube
KR102389843B1 (ko) * 2017-12-22 2022-04-22 상하이 파워 이큅먼트 리서치 인스티튜트 컴퍼니 리미티드팝업 닫기 아우터 핀 열교환 튜브 및 그 사용방법
RU2795639C1 (ru) * 2022-03-04 2023-05-05 федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технологический университет" (ФГБОУ ВО "КНИТУ") Секционный радиатор, содержащий винтовой тепловой мост

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