EP0074122B1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
EP0074122B1
EP0074122B1 EP82108341A EP82108341A EP0074122B1 EP 0074122 B1 EP0074122 B1 EP 0074122B1 EP 82108341 A EP82108341 A EP 82108341A EP 82108341 A EP82108341 A EP 82108341A EP 0074122 B1 EP0074122 B1 EP 0074122B1
Authority
EP
European Patent Office
Prior art keywords
fins
fin
heat exchanger
grooves
fin element
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
Application number
EP82108341A
Other languages
German (de)
English (en)
Other versions
EP0074122A1 (fr
Inventor
Desmond Mulock-Bentley
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.)
D MULOCK-BENTLEY AND ASSOCIATES Pty Ltd
Original Assignee
D MULOCK-BENTLEY AND ASSOCIATES Pty Ltd
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 D MULOCK-BENTLEY AND ASSOCIATES Pty Ltd filed Critical D MULOCK-BENTLEY AND ASSOCIATES Pty Ltd
Publication of EP0074122A1 publication Critical patent/EP0074122A1/fr
Application granted granted Critical
Publication of EP0074122B1 publication Critical patent/EP0074122B1/fr
Expired 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
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight

Definitions

  • This invention relates to heat exchangers, and in particular to a fin construction for use in heat exchangers which is suitable for use in dry cooling towers and similar industrial applications.
  • Our DE-A-2 912 723 describes a heat exchanger comprising a series of conduits arranged adjacent each other but spaced apart, their external surfaces being formed with registering grooves.
  • a set of fin elements in the form transversely slotted metal strips is arranged in a stack between adjacent conduits with the longitudinal edges of each fin element extending into registering grooves in the opposed conduit surfaces.
  • Each fin element has a central longitudinal zone, a transverse end zone at each end and two substantially planar longitudinal edge zones, the central longitudinal zone being planar and the edge zones each defining an obtuse included angle with the plane of the central longitudinal zone. Both edge zones lie on the same side of the plane of the central longitudinal zone.
  • these fin elements perform efficiently they have at one end a relatively wide transverse end zone and at the other end a relatively narrow transverse end zone. Alternate fin elements are displaced in the stack so that the slots in each fin are staggered relatively to those in its immediate neighbours but aligned with the slots in similarly positioned fin elements.
  • United States Patent 2,703,226 describes a heat exchanger with fin elements in the form of a U-shaped channel which is slit transversely at intervals along its length in its central longitudinal zone to provide a series of fins, alternate fins being struck up into the channel of the fin element.
  • the vertically arranged side walls of channels are provided with shoulders so that the fin elements can be stacked within each other. These stacks are fixed to the opposed surfaces of adjacent conduits in a heat exchanger.
  • One disadvantage of the fin elements described is that the presence of the vertically arranged side walls of the channel-like fin elements requires a substantial amount of metal which is largely surplus to the requirements of good heat transfer, so that the fin elements are costlier than is desirable.
  • An object of the present invention is to provide an improved heat exchanger which reduces the disadvantages mentioned above.
  • a heat exchanger comprising a series of elongate conduits spaced apart, each pair of opposed conduit surfaces being provided with rows of grooves that register and elongate fin elements located between the conduits each fin element having a central longitudinal zone two longitudinal edge zones, and a plurality of fins each of which extends across the central zone and has a planar bridge portion at each end, with the longitudinal edge zones of the fin elements inclined at an obtuse included angle with respect to the central zone and being coplanar with and adjoining certain bridge portions, each longitudinal edge surface of each fin element extending into and contacting both surfaces of a groove in a conduit, characterized in that the fins are alternatively located in two parallel planes to form two sets of fins, the bridge portions of one set being oriented at an angle with respect to the bridge portions of the other set, the grooves being so deep relatively to the fin elements that not only the longitudinal edge zones but also the adjoining coplanar bridge portions of the set of fins are in contact with the surface of the grooves.
  • the spacing of the rectilinear grooves is preferably substantially twice the distance between the parallel planes of the two sets of fins of each fin element.
  • That the thickness of the metal in the fin element is substantially constant may comprise allowing the overall width of the fin element to reduce and compressing the metal strip at least to some extent while displacing the fins in opposite directions.
  • the fin element shown in Figure 1 is formed from a single elongate metal strip and has two sets of fins which alternate with one another.
  • one set of fins is labelled with the letter A, whilst the other set is labelled with the letter B. All the fins A lie in one plane, whilst all the fins B lie in another plane which is parallel to but spaced from the plane of fins A. Both planes are equidistant from and on opposite sides of a mean plane C ( Figure 2) of the fin element.
  • the fin element is also divided into a central longitudinal zone 10 and two edge zones 12. Each fin has a planar bridge portion 16 at each end.
  • the three-dimensional form of the fin element can be seen from Figure 3.
  • the strip is transversely slit over the central zone 10 to separate the metal which will form fins A and fins B. An even number of slits is made. Fins B are then pressed below the centre plane C, being the original plane of the strip, whilst fins A are pressed above the central plane C as shown in Figure 4(b).
  • the longitudinal edge zones 12 are bent over as shown out of the plane C to form an obtuse included angle with the planes of the fins A, B as shown in Figure 4(c). This obtuse angle is ideally 135°.
  • fin elements can be formed without a separate step of forming the slits.
  • the strip is pressed selectively in interspaced opposite directions so that initial shearing of the strip is caused along the edges of the fins as the fins are pressed towards the respective parallel planes.
  • Figure 2 shows a section of a heat exchanger between two conduits 14.
  • the conduits are corrugated, so that they have substantially rectilinear grooves 20 at regular intervals along their external surfaces.
  • each fin element located is in one of these grooves 20 to form an intimate fit and provide intimate planar contact with the surface of corresponding grooves.
  • the assembly is then hot dip galvanised so as to prevent corrosion and in order to thermally bond the contacts between the intimate co-operating surfaces so as to improve heat transfer.
  • the mean perpendicular distance y between the fins A and B is chosen to be half the distance x between adjacent grooves 20. In this way, the fins B of one element are also spaced a mean distance y from the fins A of an adjacent element, thus producing a substantially uniform fin configuration throughout the space between the two conduits 14.
  • each fin element provided retains a uniform thickness of material throughout its configuration. This is achieved as explained above by allowing the overall width of the original strip of material to reduce during pressing to form the fins A and B. In earlier proposals pressing or otherwise forming the fin elements tended to cause thinning of the material at various places. Such thinning has the effect of disrupting and reducing the heat-flowing properties of the material which adversely affects the cooling characteristics of a heat exchange assembly incorporating fin elements provided in the prior art.
  • a finished fin element having uniform thickness can also be produced according to the invention by compressing the metal strip at least to some extent during the pressing to displace and form the fins into parallel planes.
  • the known fin element has fins in only one plane. As a result of this it can be difficult to obtain a close fin spacing between the conduits 14 without reducing the spacing between the grooves 20. It is difficult to reduce x because of the thickness of the walls of the conduits 14. Furthermore, these fins are provided by punching out slots. The punched-out material therefore becomes scrap whereas in a fin element according to the present invention, no metal is removed and there is therefore no material waste.
  • Fin elements generally contribute approximately 60% of the cost of a typical heat exchanger assembly prior to galvanising for a dry-type cooling tower.
  • the use of the improved fin elements of the present invention in a heat exchanger assembly has been shown to give a saving of as much as 52% on the cost of preparing and providing the fin elements for a heat exchanger. Further savings are made and security provided during assembly because longitudinal orientation of the fin elements is the same for each fin element.

Landscapes

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

Claims (3)

1. Echangeur de chaleur comprenant une série de conduits (14) allongés espacés l'un de l'autre, chaque paire de surfaces de conduits opposés étant pourvues de rangées de rainures (20) qui sont en coïncidence et d'éléments à ailettes allongés placés entre les conduits (14), chaque élément à ailettes comportant une zone longitudinale centrale (10), deux zones marginales longitudinales (12) et une pluralité d'ailettes (A, B) s'étendant chacune transversalement à la zone centrale et comportant une partie plane de pontage (16) à chaque extrémité, les zones marginales longitudinales (12) des éléments à ailettes étant inclinées d'un angle obtus par rapport à la zone centrale (10) et étant coplanaires et joines avec certaines parties de pontage (16), chaque surface marginale longitudinale de chaque élément à ailettes s'étendant vers et entrant en contact avec les deux surfaces d'une rainure (20) d'un conduit (14), caractérisé en ce que les ailettes (A, B) sont alternativement placées dans deux plans parallèles de façon à former deux ensembles d'ailettes (respectivement A et B), les parties de pontage (16) d'un ensemble (A) étant orientées d'un certain angle par rapport aux parties de pontage de l'autre ensemble (B), les rainures (20) étant suffisamment profondes par rapport aux éléments à ailettes pour que non seulement les zones marginales longitudinales (12) mais également les parties de pontage coplanaires jointes (16) de l'ensemble d'ailettes (A) soient en contact avec la surface des rainures (20).
2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que l'épaisseur du métal dans l'élément à ailettes est sensiblement-constante dans ledit élément.
3. Echangeur de chaleur selon la revendication 1 ou 2, caractérisé en ce que l'espacement des rainures rectilignes (20) est sensiblement égal au double de la distance (y) entre les plans parallèles des deux ensembles d'ailettes (A et B) de chaque élément à ailettes.
EP82108341A 1981-09-09 1982-09-09 Echangeur de chaleur Expired EP0074122B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA816239 1981-09-09
ZA816239 1981-09-09

Publications (2)

Publication Number Publication Date
EP0074122A1 EP0074122A1 (fr) 1983-03-16
EP0074122B1 true EP0074122B1 (fr) 1984-12-19

Family

ID=25575633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82108341A Expired EP0074122B1 (fr) 1981-09-09 1982-09-09 Echangeur de chaleur

Country Status (3)

Country Link
EP (1) EP0074122B1 (fr)
AU (1) AU556955B2 (fr)
DE (1) DE3261628D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0097612B1 (fr) * 1982-06-21 1988-08-10 Mitsubishi Jukogyo Kabushiki Kaisha Echangeur de chaleur

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH321270A (de) * 1954-01-29 1957-04-30 Lehmann Ernst Wärmeaustauscherelement
FR1173128A (fr) * 1954-12-22 1959-02-20 Licencia Talalmanyokat échangeur de températures et procédé et dispositif permettant sa fabrication
DE976523C (de) * 1955-03-26 1963-10-24 Karl Dipl-Ing Weiss Rippenrohr-Waermeaustauscher
GB1039544A (en) * 1962-03-07 1966-08-17 Garrett Corp Improvements relating to perforating sheet metal
FR1521499A (fr) * 1967-03-07 1968-04-19 Chausson Usines Sa Ailette pour faisceau de radiateur à tubes et ailettes
FR1527065A (fr) * 1967-04-17 1968-05-31 Chausson Usines Sa Procédé pour la fabrication d'ailettes dissipatrices de chaleur, outillage pour sa mise en oeuvre, ailette en résultant et son application à la fabrication d'échangeurs de chaleur
BE759255A (fr) * 1969-12-03 1971-04-30 Chausson Usines Sa Dissipateur ondule pour faisceau de radiateur a tubes et dissipateurs et procede pour sa fabrication
US3818568A (en) * 1973-03-29 1974-06-25 Teledyne Mid America Corp Apparatus for forming heat exchangers
DE2620706A1 (de) * 1976-05-11 1977-11-24 Schoell Guenter Rippenrohr mit einem gewellten rippenband sowie verfahren und vorrichtung zur herstellung desselben
ZA781881B (en) * 1978-04-03 1979-09-26 Mulock Bentley & Assoc Ltd Heat exchanger

Also Published As

Publication number Publication date
AU8816382A (en) 1983-03-31
AU556955B2 (en) 1986-11-27
DE3261628D1 (en) 1985-01-31
EP0074122A1 (fr) 1983-03-16

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