EP0074122A1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
EP0074122A1
EP0074122A1 EP82108341A EP82108341A EP0074122A1 EP 0074122 A1 EP0074122 A1 EP 0074122A1 EP 82108341 A EP82108341 A EP 82108341A EP 82108341 A EP82108341 A EP 82108341A EP 0074122 A1 EP0074122 A1 EP 0074122A1
Authority
EP
European Patent Office
Prior art keywords
fin
fins
planes
edge zones
plane
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.)
Granted
Application number
EP82108341A
Other languages
German (de)
English (en)
Other versions
EP0074122B1 (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.
  • FIG. 78/1881 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 of 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.
  • this earlier patent describes fin elements having 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 fin element and heat exchanger which reduces or overcomes the disadvantages mentioned above.
  • an elongate metallic fin element for use in a heat exchanger, having a central longitudinal zone, two longitudinal edge zones and a plurality of fins each extending across the central zone and arranged side by side along the length of the central zone, alternate fins being located in two parallel planes to form two sets of fins, the thickness of the metal being substantially constant throughout the fin element.
  • the longitudinal edge zones of the fin elements may be each at an obtuse included angle with respect to the two parallel planes.
  • Each fin may have planar end bridge portions in respective planes each plane being at an obtuse included angle with respect to the respect plane of that fin.
  • the bridge portions at opposite ends of each fin may lie in planes at substantially 90° to one another.
  • a heat exchanger comprising a series of conduits spaced apart and each conduit having external surfaces provided with rows of grooves that register external surfaces of adjacent opposing surfaces, and metallic fin elements each comprising a central longitudinal zone, two longitudinal edge zones and a plurality of fins each extending across the central zone and arranged side by side along the length of the central zone, alternate fins being located in two parallel planes to form two sets of fins, the thickness of the metal being substantially constant throughout the fin element, the fin elements being arranged between adjacent conduits with longitudinal ends of the fins extending into and forming intimate contracts with registering grooves in adjacent opposing surfaces of the conduits.
  • 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.
  • a method of forming a fin element for a heat exchanger having a central longitudinal zone and two longitudinal edge zones from an elongate metallic strip having a mean plane comprising selectively pressing the strip across the central longitudinal zone in interspaced opposite directions to form alternative fins in two parallel planes at either side of the mean plane and arranging the thickness of the metal to be substantially constant in the finished element.
  • the method may include forming a plurality of parallel slits across the central longitudinal zone before selectively pressing the strip.
  • the step of arranging the thickness to be substantially constant may comprise allowing the overall width of the fin element to reduce while displacing the fins in opposite directions.
  • the step of arranging the thickness to be substantially constant may comprise compressing the metal strip at least to some extent while displacing the fins in opposite directions.
  • the method may comprise displacing the strip into planes an equal distance from the original plane of the metallic.
  • the method may include displacing the fins to provide at the transverse ends of each fin a planar bridge portion, each of which bridge portions lie in a plane at an obtuse included angle with respect to a respect one of the parallel planes.
  • the method may comprise carrying out the steps of the method in one operation
  • 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 tranversely 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.
  • 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)
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 true EP0074122A1 (fr) 1983-03-16
EP0074122B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0097612A2 (fr) * 1982-06-21 1984-01-04 Mitsubishi Jukogyo Kabushiki Kaisha Echangeur de chaleur

Citations (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
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
BE711655A (fr) * 1967-03-07 1968-07-15
FR2069902A1 (fr) * 1969-12-03 1971-09-10 Chausson Usines Sa
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
DE2912723A1 (de) * 1978-04-03 1979-10-11 Mulock Bentley & Ass Waermetauscher

Patent Citations (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
BE711655A (fr) * 1967-03-07 1968-07-15
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
FR2069902A1 (fr) * 1969-12-03 1971-09-10 Chausson Usines Sa
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
DE2912723A1 (de) * 1978-04-03 1979-10-11 Mulock Bentley & Ass Waermetauscher

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0097612A2 (fr) * 1982-06-21 1984-01-04 Mitsubishi Jukogyo Kabushiki Kaisha Echangeur de chaleur
EP0097612A3 (en) * 1982-06-21 1985-01-23 Mitsubishi Jukogyo Kabushiki Kaisha Heat exchanger

Also Published As

Publication number Publication date
AU8816382A (en) 1983-03-31
EP0074122B1 (fr) 1984-12-19
AU556955B2 (en) 1986-11-27
DE3261628D1 (en) 1985-01-31

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