WO2000075593A1 - Tube d'echangeur de chaleur - Google Patents

Tube d'echangeur de chaleur Download PDF

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Publication number
WO2000075593A1
WO2000075593A1 PCT/GB2000/002152 GB0002152W WO0075593A1 WO 2000075593 A1 WO2000075593 A1 WO 2000075593A1 GB 0002152 W GB0002152 W GB 0002152W WO 0075593 A1 WO0075593 A1 WO 0075593A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
projections
walls
coolant
flow
Prior art date
Application number
PCT/GB2000/002152
Other languages
English (en)
Inventor
Garry Royston Fish
Original Assignee
Visteon Technologies, Llc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10854746&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000075593(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Visteon Technologies, Llc filed Critical Visteon Technologies, Llc
Priority to EP00935394A priority Critical patent/EP1183491B1/fr
Priority to DE60009284T priority patent/DE60009284T2/de
Publication of WO2000075593A1 publication Critical patent/WO2000075593A1/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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • 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
    • F28F2001/027—Tubular elements of cross-section which is non-circular with dimples

Definitions

  • This invention relates to heat exchangers for reducing the temperature of the coolant which circulates in a heat exchange circuit.
  • the present invention relates to tubes for conveying coolant through such heat exchangers, for example vehicle radiators, or through any tube/fin heat exchanger such as a heater core.
  • US patent 4 470 452 discloses a radiator tube which is constructed so as to produce turbulence in the coolant flow to improve the heat exchange characteristics between the coolant and the air which, in use, flows through the radiator and past the tubes.
  • the radiator tubes disclosed have flow diverting members placed along the length of each principal heat transfer surface, with the principal heat transfer surfaces being bowed outwardly.
  • the flow diverting members (which actually take the form of indentations or dimples pressed into the walls of the tubes) are present to provide turbulence in the coolant as it flows along the tube.
  • US Patent 2 017 201 describes a condenser tube which has a pair of parallel walls and inwardly extending transverse indentations which form transverse restrictions in the passage through the tube offset from the central plane of the tube. The presence of these indentations or ribs produces turbulence of the liquid circulating through the tubes .
  • the absence of turbulence in my invention can also reduce the back pressure which the coolant experiences in flowing through the tubes. As a result, better heat transfer is achieved.
  • a tube for conveying coolant through a heat exchanger having a flattened cross-section with two major opposing walls and internal projections on the major opposing walls, the projections extending into the internal cross- sectional area of the tube to interfere with the flow of coolant along the tube, wherein each projection extends across less than 30% of the width of the tube and the area of the tube walls having projections amounts to less than 7.5% of the total area of the tube walls.
  • the projections are preferably dimples formed in the tube walls, the dimples having substantially equal dimensions in the direction of flow and transverse to the direction of flow. This ensures that the coolant flow is diverted in two planes, namely over the projections and around the projections, which produces particularly effective mixing of the coolant under laminar flow conditions.
  • the area of the tube walls occupied by projections amounts to less than 7.5% but more than 1% of the total area of the tube walls. Better results are achieved if the area of the tube walls occupied by projections amounts to less than 5%, and the best results obtained by the inventor at the time of preparation of this specification are achieved when the area of the tube walls occupied by projections amounts to approximately 2.5% of the total area of the tube walls.
  • the projections will normally be formed in a regular or repeating pattern.
  • the projections may be arranged in groups and within each group the projections can be arranged on a line extending across the tube.
  • the projections on one wall can extend in a diagonally opposite direction to the line of projections on the other (opposing) wall.
  • projections on one wall may alternate with projections on the other wall.
  • the alternating projections may be in line or may be offset relative to an imaginary line parallel to the tube axis.
  • the projections on one wall can be greater in number than the projections on the other (opposing) wall.
  • the tube may be formed from any suitable material, for example metal or a plastics material.
  • a preferred material is aluminium or an aluminium alloy and the tube is preferably formed from sheet material and is formed into a tube by a longitudinally extending weld, with the weld seam running along one edge of the tube which joins the two major walls, after the tube has been flattened.
  • the tube could be formed by other means, for example extrusion or pre-casting, and the weld seam of the tube (if welded) could extend in other directions.
  • the projections preferably take the form of dimples or indentations formed in the outer surface of the tube walls, to appear as projections in the internal cross- section of the tube.
  • the projections can be generally square in plan view, but a wide variety of non square shapes is also possible.
  • the projections may have a length greater than their width, and in this case the length of the projections can be set at an angle to the length of the tube.
  • the projections are generally square or rectangular in plan view, there may be benefits from having projections which are oval or circular in plan view,- for example circular indentations may help promote laminar flow while still permitting mixing. Oval indentations may help promote directional flow depending on the orientation of the axes.
  • each tube can be free from any indentations formed in the external tube surface, so that the tube ends can be reliably sealed into heat exchanger header tanks without any potential leak paths resulting from indentations lying within the tube/header tank joint area.
  • the invention also provides a heat exchanger having a heat exchange core comprising a plurality of parallel coolant tubes separated by heat exchange fins, wherein each of the tubes has a flattened cross-section with two major opposing walls and internal projections on the major opposing walls, the projections extending into the internal cross-sectional area of the tube to interfere with the flow of coolant along the tube, wherein each projection extends across less than 30% of the width of the tube and the area of the tube walls having projections amounts to less than 7.5% of the total area of the tube walls .
  • the invention provides a method of operating a heat exchanger in which coolant is conveyed through tubes, wherein each tube has a flattened cross- section with two major opposing walls and internal projections on the major opposing walls, the projections extending into the internal cross-sectional area of the tube to an extent such that laminar coolant flow is maintained within the tube over the normal operating range of the heat exchanger.
  • the laminar flow preferably follows a path which is diverted from wall to wall and from side to side between the tube walls. This ensures excellent mixing of the coolant without disturbing the laminar nature of the flow.
  • Figure 1 is a scrap view showing one part of a conventional heat exchanger construction
  • Figure 2 is a cross section through a prior art heat exchanger tube
  • Figure 3 is a perspective view of a tube in accordance with the invention.
  • Figures 4 and 5 show alternative cross-sections on the line IV,V-IV,V;
  • Figure 6 is a plan view of the tube of Figure 3 ;
  • Figure 7 is a plan view of part of an alternative form of tube in accordance with the invention.
  • FIG. 1 a typical motor vehicle radiator is shown.
  • the radiator has a heat exchange core or matrix 10 connected to a header tank 12.
  • the core 10 consists of a number of parallel coolant tubes 14 with heat exchange fins 16 of concertina form mounted between the tubes 14 and in heat exchange contact with the tubes.
  • coolant flows into the header tank 12 and from the header tank through the tubes 14 to a similar header tank at the opposite end of the radiator. Air moves through the fins 16, and the heat of the coolant in the tubes 14 is given up to the air passing through the fins.
  • Figure 2 shows an enlarged cross sectional view through a tube 14.
  • the tube is formed from thin sheet material of flattened cross-section but with slightly bowed major faces 18 and 20.
  • the tubes are formed from initially flat material which is welded together by a longitudinal weld indicated at 22.
  • the tube 14 shown in Figure 2 has a smooth internal bore 24. If coolant flows along a tube 14 with a smooth internal bore, the coolant flow along the tube tends to be laminar or streamline flow. In this case there will be a region at the centre of the flow (indicated in dotted lines 26 in Figure 2) where the coolant has no inducement to make contact with the walls of the tube, and this region of coolant is therefore insulated from the heat exchange taking place at the tube walls by the body of coolant between the region and the tube walls. It is therefore clearly desirable to interfere with the coolant flow through the tube and to provide mixing of the coolant as it passes through the tubes, so that heat exchange takes place with all of the coolant, and uniform temperature distribution throughout the fluid is promoted.
  • Turbulator radiator tubes As their name implies, produce turbulence in the flow which does enhance mixing. However the production of turbulence results in a resistance to flow which detracts from the performance.
  • Figure 3 is a perspective view of a tube in accordance with the invention. It is intended that coolant will flow through the tube as indicated by an arrow 28, and whilst passing through the tube will encounter projections 30a, 30b ( Figures 4 and 5) which are formed on the internal wall of the tube by indentations pressed from the outside wall of the tube.
  • the indentations are indicated by reference numeral 32 in Figure 3, and the corresponding projections by 30a and 30b in Figures 4 and 5.
  • Figures 4 and 5 illustrate alternative forms of indentation.
  • the indentations are round- bottomed, and in Figure 5 the indentations have a trapezoid cross-section. These sections are taken on the lines IV,V-IV,V from Figure 3.
  • the preferred depth d for the indentations 30a, 30b is between 35 and 50% of the internal tube height.
  • Figure 3 shows only side of the tube
  • the other side of the tube will also be provided with corresponding indentations 32.
  • Figure 6 illustrates this with indentations on the upper (as seen in the Figure) face of the tube being shown in solid lines with the indentations on the lower or underneath side of the tube being shown in dotted outline.
  • the indentations on the upper face extend along a line which makes an angle of approximately 45° to the length of the tube, and the indentations on the lower face are arranged in a corresponding manner, but along a line which makes an opposite angle of 45° to that of the indentations on the upper face.
  • the preferred range for such angles is 30 to 60°.
  • Figure 7 shows a smaller section of an alternative form of tube with indentations 132 which are elongated in form and have their long axis angled to the direction of coolant flow 28.
  • indentations 132 which are elongated in form and have their long axis angled to the direction of coolant flow 28.
  • the corresponding indentations on the lower face have the same form but follow a line which crosses the line of indentations on the upper face.
  • the invention is not limited to any particular form or arrangement of indentations, but it is expected that the indentations will be positioned in a regular array rather than a random array. The intention however is that the presence of the indentations/pro ections m the tube should interrupt the coolant flow sufficiently to ensure mixing of the coolant within each tube but should not interfere with the flow so drastically as to prevent the flow being generally laminar or streamline m form.
  • Figure 8 illustrates the nature of this flow within a tube 14 past projections 30.
  • the flow will divert and pass around the projection.
  • the distance between projections (seen in the longitudinal direction) is comparatively long, there will be sufficient time for the flow to resume its laminar form before it encounters the next projection whereupon diversion and therefore coolant mixing will take place again.
  • Figure 8 shows the flow pattern in one plane. It must however be appreciated that the flow is also constrained by the presence of the projections both above and below the plane shown m Figure 8, and therefore the diversion of the flow when encountering a projection will take place both laterally (as shown in Figure 8) and also perpendicularly (as shown in Figure 9) to the major plane of the tube .
  • each tube will preferably be formed without any indentations, so that those ends can be reliably sealed to a header plate 34 (Figure 1) where the tubes 14 communicate with the header tank 12.
  • Figure 1 where the tubes 14 communicate with the header tank 12.
  • the number and area of projections which interfere with the coolant flow through the tubes is substantially reduced. This has benefits in
  • Typical tube dimensions for a radiator for a passenger vehicle with an internal combustion engine have a major axis dimension of about 26 mm and a minor axis dimension of about 2 mm.
  • Each indentation 32 can have a dimension of 1-2 mm 2 , and the area of the tube covered by indentations can amount to about 2.5% of the total tube surface area.
  • Tests can be carried out to determine the optimum configuration and form of the indentation, either through practical tests with different samples, or through computer modelling.

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)

Abstract

L'invention concerne des tubes (14) de refroidissement pour échangeurs de chaleur. Des protubérances (30) sont formées dans ces tubes et s'étendent transversalement vers l'intérieur de la section du tube de manière à perturber l'écoulement (28) de fluide et à assurer le brassage du fluide de refroidissement lors de son passage dans les tubes. Afin que le degré de brassage requis soit atteint sans causer de turbulences et provoquer ainsi un reflux inutile, la surface de la paroi du tube occupée par les protubérances (30) représente moins de 7,5 % de la surface totale de la paroi du tube.
PCT/GB2000/002152 1999-06-05 2000-06-05 Tube d'echangeur de chaleur WO2000075593A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00935394A EP1183491B1 (fr) 1999-06-05 2000-06-05 Tube pour transporter d'un produit réfrigérant au travers d'un échangeur de chaleur
DE60009284T DE60009284T2 (de) 1999-06-05 2000-06-05 Rohr zum Transport eines Kühlmittels durch einen Wärmetauscher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9913023.9 1999-06-05
GBGB9913023.9A GB9913023D0 (en) 1999-06-05 1999-06-05 Tube for conveying coolant through a heat exchanger

Publications (1)

Publication Number Publication Date
WO2000075593A1 true WO2000075593A1 (fr) 2000-12-14

Family

ID=10854746

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/002152 WO2000075593A1 (fr) 1999-06-05 2000-06-05 Tube d'echangeur de chaleur

Country Status (4)

Country Link
EP (1) EP1183491B1 (fr)
DE (1) DE60009284T2 (fr)
GB (1) GB9913023D0 (fr)
WO (1) WO2000075593A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052490A1 (fr) * 2003-10-28 2005-06-09 Behr Gmbh & Co. Kg Canal d'ecoulement pour dispositif de transfert de chaleur et dispositif de transfert de chaleur comprenant de tels canaux d'ecoulement
US7347254B2 (en) 2000-06-17 2008-03-25 Behr Gmbh & Co. Heat exchanger for motor vehicles
WO2020027007A1 (fr) * 2018-07-30 2020-02-06 株式会社ティラド Noyau d'échangeur de chaleur
JP2020026905A (ja) * 2018-08-09 2020-02-20 マレリ株式会社 熱交換チューブ及び熱交換器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11498162B2 (en) 2018-09-21 2022-11-15 Johnson Controls Tyco IP Holdings LLP Heat exchanger tube with flattened draining dimple

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017201A (en) 1931-11-27 1935-10-15 Modine Mfg Co Condenser tube
US4470452A (en) 1982-05-19 1984-09-11 Ford Motor Company Turbulator radiator tube and radiator construction derived therefrom
EP0165583A2 (fr) * 1984-06-20 1985-12-27 Hitachi, Ltd. Tube de transfert de chaleur pour écoulement monophasique
JPS6317393A (ja) * 1986-07-08 1988-01-25 Nippon Denso Co Ltd 熱交換器
DE29509684U1 (de) * 1994-07-06 1995-11-09 Bbk Blechbearbeitung & Kompone Plattenelement für Gas/Gas-Wärmetauscher
US5730213A (en) * 1995-11-13 1998-03-24 Alliedsignal, Inc. Cooling tube for heat exchanger
WO1998044305A1 (fr) * 1997-04-02 1998-10-08 Creare Inc. Echangeur thermique a flux radial

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017201A (en) 1931-11-27 1935-10-15 Modine Mfg Co Condenser tube
US4470452A (en) 1982-05-19 1984-09-11 Ford Motor Company Turbulator radiator tube and radiator construction derived therefrom
EP0165583A2 (fr) * 1984-06-20 1985-12-27 Hitachi, Ltd. Tube de transfert de chaleur pour écoulement monophasique
JPS6317393A (ja) * 1986-07-08 1988-01-25 Nippon Denso Co Ltd 熱交換器
DE29509684U1 (de) * 1994-07-06 1995-11-09 Bbk Blechbearbeitung & Kompone Plattenelement für Gas/Gas-Wärmetauscher
US5730213A (en) * 1995-11-13 1998-03-24 Alliedsignal, Inc. Cooling tube for heat exchanger
WO1998044305A1 (fr) * 1997-04-02 1998-10-08 Creare Inc. Echangeur thermique a flux radial

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 218 (M - 711) 22 June 1988 (1988-06-22) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7347254B2 (en) 2000-06-17 2008-03-25 Behr Gmbh & Co. Heat exchanger for motor vehicles
WO2005052490A1 (fr) * 2003-10-28 2005-06-09 Behr Gmbh & Co. Kg Canal d'ecoulement pour dispositif de transfert de chaleur et dispositif de transfert de chaleur comprenant de tels canaux d'ecoulement
CN1875240B (zh) * 2003-10-28 2010-10-13 贝洱两合公司 热交换器的流道以及带有这种流道的热交换器
EP2267393A2 (fr) * 2003-10-28 2010-12-29 Behr GmbH & Co. KG Canal d'écoulement pour un échangeur de chaleur et échangeur de chaleur doté d'un tel canal
EP2267393A3 (fr) * 2003-10-28 2012-07-04 Behr GmbH & Co. KG Canal d'écoulement pour un échangeur de chaleur et échangeur de chaleur doté d'un tel canal
WO2020027007A1 (fr) * 2018-07-30 2020-02-06 株式会社ティラド Noyau d'échangeur de chaleur
JPWO2020027007A1 (ja) * 2018-07-30 2021-08-02 株式会社ティラド 熱交換器コア
JP7386789B2 (ja) 2018-07-30 2023-11-27 株式会社ティラド 熱交換器コア
JP2020026905A (ja) * 2018-08-09 2020-02-20 マレリ株式会社 熱交換チューブ及び熱交換器
JP7181725B2 (ja) 2018-08-09 2022-12-01 マレリ株式会社 熱交換チューブ及び熱交換器

Also Published As

Publication number Publication date
EP1183491B1 (fr) 2004-03-24
EP1183491A1 (fr) 2002-03-06
GB9913023D0 (en) 1999-08-04
DE60009284T2 (de) 2005-01-27
DE60009284D1 (de) 2004-04-29

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