WO1998006995A1 - Echangeur thermique - Google Patents

Echangeur thermique Download PDF

Info

Publication number
WO1998006995A1
WO1998006995A1 PCT/EP1997/003874 EP9703874W WO9806995A1 WO 1998006995 A1 WO1998006995 A1 WO 1998006995A1 EP 9703874 W EP9703874 W EP 9703874W WO 9806995 A1 WO9806995 A1 WO 9806995A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
heat exchanger
ratio
section
wall thickness
Prior art date
Application number
PCT/EP1997/003874
Other languages
English (en)
Inventor
Bjorn Vestergaard
Original Assignee
Norsk Hydro Asa
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 Norsk Hydro Asa filed Critical Norsk Hydro Asa
Priority to AU37686/97A priority Critical patent/AU3768697A/en
Publication of WO1998006995A1 publication Critical patent/WO1998006995A1/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
    • F28F1/02—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
    • F28F1/24—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/12—Fastening; Joining by methods involving deformation of the elements
    • F28F2275/125—Fastening; Joining by methods involving deformation of the elements by bringing elements together and expanding

Definitions

  • the present invention relates to a heat exchanger, more precisely to a heat exchanger of the type defined in the preamble of Claim 1
  • an improved heat exchanger is ODtained by the characte ⁇ stic portion of claim 1.
  • a heat excna ⁇ ger is obtained in which the pressure transmitted by the tube to the fins is more evenly distributed, thereby obtaining a more evenly distributed heat exchange contact between the tubes and the fins.
  • Fig. 1 which is a part of a heat exchanger shown in cross section,.
  • Fig. 2 is a schematic representation of the stress on the tube wall in operative and non-operative condition
  • Fig. 3 is a schematic representation of the tube form in operative and non-operative condition
  • Fig. 4 is a diagram showing the variations in stress in the tube wall.
  • the heat exchanger shown in the drawing is of the type disclosed in EP - A - 0 633 435 and for the general information about that construction, reference is made to that publication.
  • the tube has in cross section a maximum dimension b and a minimum dimension a.
  • the wall thickness of the tube may vary according to the location. In this way four locations are important with respect to the tension when the tube is under internal pressure. These locations are the places with largest radius indicated by their thickness S. and S, and the places with the smaller radius indicated by their thickness S 3 and S 4 .
  • the tube is optimised with respect to its strength against internal pressure and lowest material consumption.
  • S ( S., + S 2 + S 3 + S 4 )/4
  • Fig. 2 there is shown the tube 12 and in the left hand part of the drawing there is shown the stress T 0 in the wall of the tube 12 when no pressurised fluid is present within the tube. In this situation the fins exert from the outer side a pressure on the wall of the tube 12, which pressure is the highest in the small diameter portions.
  • the stress T p in the tube wall when a pressurised fluid is present within the tube in which case the fluid exerts a pressure on the tube wall as shown in that part of fig. 2, the stress being the smallest in the small radius portion of the tube
  • the tension T ⁇ in the left hand side and the stress T in the right hand side of fig. 2 are differently oriented, in the left hand side being from the outside to the inside and in the right hand side being from the inside to the outside.
  • the schematic representation of fig 2 is based upon calculations made with respect to a simplified model of a so called flat oval tube.
  • the simplification has primarily to do with the fact that it was accepted that the tube has an ellipse shape with a major axis of 12 mm and a minor axis of 3.2 mm and an average wall thickness of 0.5 mm. In the normal use of a heat exchanger this is quit often switched on and off, which means that with the same frequency a pressurised fluid is supplied to the interior of the tube 12 and the pressure relieved after switching off.
  • the stress T occurring in a small radius portion of the tube wall is represented in fig 4 in function of the time t Every time the heat exchanger is switched on the stress increases nearly stepwise, and after switching off it decreases more or less in the same way

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

Echangeur thermique comprenant un groupe de tubes fixés à un paquet d'ailettes grâce à l'expansion mécanique des tubes faisant suite à leur insertion dans des trous alignés dans les ailettes. Les tubes ont une section oblongue sans la moindre paroi plane. Un premier rapport entre la dimension maximum (b) et la dimension minimum (a) de la section est compris entre 2,80 et 5,20, et un second rapport entre la dimension maximum (b) de la section et l'épaisseur (s) du tube est compris entre 15 et 38. L'épaisseur de la paroi du tube satisfait à l'équation: {[(S3 + S4)/(S1 + S2)]-1}* 100 > 5, dans laquelle S3 et S4 représentent l'épaisseur de la paroi dans la zone où le tube a le plus petit rayon, et S1 et S2 représentent l'épaisseur de la paroi dans la zone où le tube a le plus grand rayon.
PCT/EP1997/003874 1996-08-08 1997-07-15 Echangeur thermique WO1998006995A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37686/97A AU3768697A (en) 1996-08-08 1997-07-15 Heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96202233A EP0823610A1 (fr) 1996-08-08 1996-08-08 Echangeur de chaleur
EP96202233.1 1996-08-08

Publications (1)

Publication Number Publication Date
WO1998006995A1 true WO1998006995A1 (fr) 1998-02-19

Family

ID=8224266

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/003874 WO1998006995A1 (fr) 1996-08-08 1997-07-15 Echangeur thermique

Country Status (3)

Country Link
EP (1) EP0823610A1 (fr)
AU (1) AU3768697A (fr)
WO (1) WO1998006995A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8434698A (en) 1997-05-16 1998-12-11 Norsk Hydro Asa Flat oval tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239002A (en) * 1964-01-06 1966-03-08 Young Radiator Co Tube formation for structuring heatexchanger core-units
FR2269053A1 (fr) * 1974-04-25 1975-11-21 Chausson Usines Sa
FR2406794A1 (fr) * 1977-10-21 1979-05-18 Volkswagenwerk Ag Echangeur de chaleur, en particulier de metal leger
EP0633435A1 (fr) 1993-07-06 1995-01-11 MAGNETI MARELLI CLIMATIZZAZIONE S.r.l. Condenseur pour des systèmes de conditionnement d'air, en particulier pour voitures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239002A (en) * 1964-01-06 1966-03-08 Young Radiator Co Tube formation for structuring heatexchanger core-units
FR2269053A1 (fr) * 1974-04-25 1975-11-21 Chausson Usines Sa
FR2406794A1 (fr) * 1977-10-21 1979-05-18 Volkswagenwerk Ag Echangeur de chaleur, en particulier de metal leger
EP0633435A1 (fr) 1993-07-06 1995-01-11 MAGNETI MARELLI CLIMATIZZAZIONE S.r.l. Condenseur pour des systèmes de conditionnement d'air, en particulier pour voitures

Also Published As

Publication number Publication date
EP0823610A1 (fr) 1998-02-11
AU3768697A (en) 1998-03-06

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