EP0654647A1 - Tube à ailettes pour échangeur de chaleur - Google Patents

Tube à ailettes pour échangeur de chaleur Download PDF

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Publication number
EP0654647A1
EP0654647A1 EP94203360A EP94203360A EP0654647A1 EP 0654647 A1 EP0654647 A1 EP 0654647A1 EP 94203360 A EP94203360 A EP 94203360A EP 94203360 A EP94203360 A EP 94203360A EP 0654647 A1 EP0654647 A1 EP 0654647A1
Authority
EP
European Patent Office
Prior art keywords
finned tube
channel
fins
tube according
finned
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.)
Withdrawn
Application number
EP94203360A
Other languages
German (de)
English (en)
Inventor
Jan Hubertus Deckers
Hendrikus Louis Gerardus Marie Giesen
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.)
Dejatech Bv
Original Assignee
Dejatech Bv
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 Dejatech Bv filed Critical Dejatech Bv
Publication of EP0654647A1 publication Critical patent/EP0654647A1/fr
Withdrawn legal-status Critical Current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
    • F28F1/26—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 being integral with the element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
    • B22C9/26—Moulds for peculiarly-shaped castings for hollow articles for ribbed tubes; for radiators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0063—Casting in, on, or around objects which form part of the product finned exchangers
    • 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
    • F28F1/422—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 with outside means integral with the tubular element and inside means integral with 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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/088—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal for domestic or space-heating systems

Definitions

  • the invention relates to a finned tube, suitable in particular for use in a heat exchange device, which finned tube is manfactured from metal and comprises a tubular body which defines a channel, connecting means and fin-shaped projections extending from the body.
  • tubes In the heating of liquids by heat exchange, use is made of tubes, and a highly heated fluid is passed through a channel or on the outside around the tube. The tubes are thereby heated and can deliver the thus absorbed heat to a liquid to be heated. In order to obtain a good heat transfer between the heated fluid and the liquid to be heated, these tubes are typically provided with uniformly spaced-apart fins extending from the outside of the tube. Such a tube is referred to as a finned tube and has the advantage that the contact surface is relatively large by virtue of the fins.
  • Finned tubes are manufactured by providing an extruded tubular profile with at least a series of fins by means of finishing operations, such as turning or milling, or, for instance, by welding-on or by cold deformation. Further, in the known finned tubes, the ends are provided in comparable manner with, for instance, grooves for fitting packing rings or like sealing and connecting means.
  • the object of the invention is to provide a finned tube of the type described in the preamble which does not have the above-mentioned disadvantages and enables a good heat transfer.
  • the finned tube according to the invention is characterized in that it is manufactured by die casting in a die.
  • the finned tube according to the invention By manufacturing the finned tube according to the invention by die casting in a die, the advantage gained is that the fins and connecting means can be formed directly on the body without necessitating any further shaping finishing operations after the finned tube has been withdrawn. In this manufacturing method only a minimum of material is lost and it allows great freedom in designing inter alia the fins and the channel, so that optimum heat transfer is made possible.
  • the finned tube generally used in CH boilers is circumfused by flue gases on the outside thereof, in a direction perpendicular to the channel.
  • flue gases on the outside thereof, in a direction perpendicular to the channel.
  • the finned tube according to the invention provides the possibility of giving both the body and the fins of the finned tubes a cross section other than a circular cross section.
  • the cross section of the tube and the design of the fins can be made in such a manner that during circumfusion of the tube by gas perpendicularly to the channel, the intensity of the contact between the tube and the circumfluent gas is optimal.
  • the surface of the side of the finned tube facing in the downstream direction of the flue gases can be kept to a minimum.
  • a considerably better thermal efficiency of the entire boiler can be obtained.
  • the finned tube according to the invention being manufactured by die casting in a die, a further advantage is gained in that fins can be obtained which are relatively long with respect to the diameter of the body, and which may be relatively thin as well as relatively thick. Thus the thermal efficiency can be increased even further. Moreover, the fins can be provided both internally and externally.
  • the finned tube has a substantially oval, preferably elliptical, cross section.
  • a relatively large number of finned tubes can be arranged in a narrow space, so that with a relatively small volume of a heat exchange device a large capacity can be obtained.
  • the resultant achievement is that the greater part of the surface is in intensive contact with the hot flue gases since the surface of the outside of the finned tube facing in the downsteam direction of the flue gases is then minimal.
  • the fins may be provided with recesses and/or openings, so that the finned tube can be secured in a heat exchanger device in a simple manner, for instance against rods or ribs of the heat exchanger device which extend in the recesses of the respective fins. Moreover, with them, contact between juxtaposed finned tubes and/or the housing of a heat exchange device can be effected or, conversely, be prevented.
  • the internal surface of the finned tube may be provided with ribs extending parallel to the channel.
  • the body of the finned tube viewed in the longitudinal direction, has an irregular wall thickness and the channel has a varying cross section.
  • the flow velocity through the channel of the finned tubes, the extent of heat delivery to the tube by the heated, flowing fluid, and the extent of heat delivery to the liquid to be heated can be controlled in optimum manner, so that the efficiency of the heat exchange device comprising a number of finned tubes according to the invention can be increased considerably compared with a heat exchange device comprising a number of known finned tubes.
  • the fins are provided on the body with different interspaces, inclined relative to the channel, and have a curved surface.
  • the contact surface varies at different positions along the finned tube, so that the heat transfer can be further optimized. Due to the fins being inclined relative to the channel and having a curved surface, the fluid flowing along the finned tube during use can be made to whirl, yielding a better contact between the fluid and the finned tube, and hence a better heat transfer.
  • This embodiment moreover has the advantage that the finned tube has a relatively small overall width in combination with a relatively large contact surface.
  • the fins are hollow and open towards the channel.
  • the fluid flowing through the channel can also flow through the fins, so that the contact surface between the liquid and the inside of the finned tube is appreciably enlarged.
  • the finned tube according to the invention can be used in heat exchange devices working according to different principles of operation.
  • a heated liquid or gas can be passed through the channel with the finned tube surrounded by stationary or fluent liquid to be heated, or a liquid to be heated can be passed through the channel with the finned tube surrounded by a heated liquid or gas.
  • the finned tube can therefore be heated directly or indirectly.
  • the finned tube as shown in Fig. 1 comprises a tubular body 1 comprising a channel 2 which is connectible to an inlet channel and a discharge channel not shown in the drawing. Extending from the body 1 are a series of fins 3a-3z mutually separated by interspaces 8a-8z, the fins 3 each residing in a plane approximately perpendicular to the longitudinal direction of the channel 2.
  • the fin 3a and the fin 3z being, respectively, the lowermost and the uppermost fin as viewed in the drawing, are each located at some distance from the adjacent ends 4 and 5, respectively.
  • a wall 6 extends on two diametrically located sides of the body 1 between the lowermost fin 3a and the uppermost fin 3z.
  • a fluid for instance a liquid to be heated, such as CH water.
  • a fluid for instance a liquid to be heated, such as CH water.
  • the fluid can for instance be a hot gas, such as hot flue gas coming from a burner.
  • the fins and the channel 2 according to Fig. 1 have an elliptical cross section, the two walls 6 being located on the short axis K of the ellipse.
  • the elliptical cross section leads to an improved heat exchange between the finned tube and the fluid, such as for instance hot flue gases, flowing around the finned tube in a direction 10 perpendicular to the channel 2.
  • ellipse-shaped tubes enable better packing of the space, such as for instance a flue duct, through which flows the circumfluent fluid 10 than in the case where this space is filled with finned tubes having a circular cross section.
  • the channel 2 of the finned tube has a cross section whose area increases from the middle towards the end, while the wall thickness 7 decreases in the same direction. This is particularly advantageous if it must be possible for the (pressure) die cast finned tube to be withdrawn in order that the mandrils for forming the channel 2 can be removed from this channel 2.
  • the internal surface of the channel 2 may be provided with ribs 11 extending in the longitudinal direction. These ribs 11 enlarge the heating surface on the inside of the tube, which effects an improvement of the efficiency of the finned tube.
  • the fins 3 have an elliptical cross section, while the channel 2 has a circular cross-section.
  • the advantage of this embodiment is that the fins 3 enable optimum heat exchange while the finned tube can yet be connected to conventional circular connecting openings, which permits the use of generally available sealing means, such as O-rings, for the sealing thereof.
  • sealing means such as O-rings
  • the channel 2 is placed in the center of the elliptical fins 3, but it is, of course, also possible to place the center of the cross section of the channel 2 closer to one of the edges of the ellipse-shaped or optionally differently shaped fins 3, so that on one side of the finned tube a greater heat transferring surface is obtained than on the opposite side.
  • the interspace 8 between the fins 3 can be smaller in the middle than at the ends.
  • the fin height i.e., the extent to which the fins 3 extend outside the body 1, can be relatively large with respect to the diameter of the body 1.
  • fins 3 having a height of, for instance, 60 mm or more can be provided on a body 1 with a maximum outside dimension of, for instance, 23 mm.
  • the fins 3 may then be thin, for instance 3 mm or less, as well as thick, for instance 10 mm or more, and the fins 3 can be distributed over the body 1 with any desired interspace, for instance at intervals of between 3 mm and 10 mm.
  • the body 1 can basically have any cross section.
  • a typical finned tube according to the invention is, for instance, 450 mm long, has a body of a diameter of 23 mm, and fins of a height of 60 mm, a thickness of between 3 and 10 mm and spaced apart a distance of between 3 and 10 mm.
  • the surface of the fins is preferably within a square of about 150 x 150 mm.
  • Fig. 4 is a sectional view of a different embodiment of a finned tube according to the invention.
  • the exemplary embodiment shown is characterized by a large variety in shape of the fins 12 of the finned tube.
  • the fins 12 are even partly hollow, which positively affects the heat exchanging properties of the finned tube.
  • the fins 12 are arranged at a slight inclination relative to the channel 2, which can cause the circumfluent fluid 10 to whirl, so that the intensity of the contact between the circumfluent fluid and the finned tube is favorably affected and hence the heat exchange efficiency of the finned tube is improved. It is clear that in the manufacture of such a finned tube a degradable core has to be used because the channel 2, owing to the fins 12 provided with cavities 13, has a non-clearing shape.
  • Fig. 5 shows a top plan view of a finned tube having rectangular, and more specifically square, fins 3 of, for instance, 150 x 150 mm.
  • the body 1 has a circular cross section having a 30 mm outer diameter.
  • eight internal fins 11 are provided, which may for instance be finger-shaped, rib-shaped or identical in shape to the outer fins 3.
  • the wall thickness of the body 1 is, for instance, some millimeters and optionally varies along the length of the finned tube.
  • the fins 3 may have the same thickness throughout their surface, preferably of between 3 and 10 mm.
  • the internal fins 11 provide for an additionally intensive contact between the body 1 and the medium flowing through the channel 2, in particular when the internal fins 11 are finger-shaped, because this gives rise to turbulence.
  • the fins 3 are each provided, on diametrically opposite sides thereof, with a recess 20 in which, for instance, a rib (not shown) of a housing of a heat exchanger device can be snugly received for support.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP94203360A 1993-11-18 1994-11-17 Tube à ailettes pour échangeur de chaleur Withdrawn EP0654647A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9301995A NL9301995A (nl) 1993-11-18 1993-11-18 Vinbuis voor een warmteuitwisselinrichting.
NL9301995 1993-11-18

Publications (1)

Publication Number Publication Date
EP0654647A1 true EP0654647A1 (fr) 1995-05-24

Family

ID=19863149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94203360A Withdrawn EP0654647A1 (fr) 1993-11-18 1994-11-17 Tube à ailettes pour échangeur de chaleur

Country Status (2)

Country Link
EP (1) EP0654647A1 (fr)
NL (1) NL9301995A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001075384A1 (fr) * 2000-04-03 2001-10-11 Sung Jam Wi Tube de refroidissement et echangeur thermique l'utilisant
WO2006056190A1 (fr) * 2004-11-26 2006-06-01 Webasto Ag Procede pour realiser un echangeur thermique
WO2008138988A1 (fr) * 2007-05-14 2008-11-20 Shell Internationale Research Maatschappij B.V. Dispositif d'échange thermique indirect et procédé d'échange thermique
US8910881B2 (en) 2004-11-26 2014-12-16 Webasto Ag Air heater for a motor vehicle
CN105486148A (zh) * 2015-12-31 2016-04-13 无锡辉腾科技有限公司 一种用于空浴式汽化器的翅片换热管
CN108513375A (zh) * 2018-06-08 2018-09-07 北京汉能光伏投资有限公司 一种加热管及包含其的加热装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE466579A (fr) *
BE368573A (fr) *
CH111633A (de) * 1924-11-18 1925-08-17 Junkers Hugo Wärmeaustauschvorrichtung.
US2227680A (en) * 1935-12-18 1941-01-07 Albert J Townsend Finned tubing or the like
DE2222610A1 (de) * 1972-05-09 1973-10-31 Hagedorn Und Bailly Waermeuebertragungsanlage
US3847212A (en) * 1973-07-05 1974-11-12 Universal Oil Prod Co Heat transfer tube having multiple internal ridges
FR2279055A1 (fr) * 1974-07-17 1976-02-13 Albari Spa Element de radiateur
FR2354156A1 (fr) * 1976-06-09 1978-01-06 Maurice Michel Tube a ailettes, notamment pour un echangeur thermique, et procede mis en oeuvre pour fabriquer ce tube
FR2385069A1 (fr) * 1977-03-21 1978-10-20 Perani Fond Spa Element modulaire en alliage leger, permettant de realiser des radiateurs pour locaux

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE466579A (fr) *
BE368573A (fr) *
CH111633A (de) * 1924-11-18 1925-08-17 Junkers Hugo Wärmeaustauschvorrichtung.
US2227680A (en) * 1935-12-18 1941-01-07 Albert J Townsend Finned tubing or the like
DE2222610A1 (de) * 1972-05-09 1973-10-31 Hagedorn Und Bailly Waermeuebertragungsanlage
US3847212A (en) * 1973-07-05 1974-11-12 Universal Oil Prod Co Heat transfer tube having multiple internal ridges
FR2279055A1 (fr) * 1974-07-17 1976-02-13 Albari Spa Element de radiateur
FR2354156A1 (fr) * 1976-06-09 1978-01-06 Maurice Michel Tube a ailettes, notamment pour un echangeur thermique, et procede mis en oeuvre pour fabriquer ce tube
FR2385069A1 (fr) * 1977-03-21 1978-10-20 Perani Fond Spa Element modulaire en alliage leger, permettant de realiser des radiateurs pour locaux

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001075384A1 (fr) * 2000-04-03 2001-10-11 Sung Jam Wi Tube de refroidissement et echangeur thermique l'utilisant
WO2006056190A1 (fr) * 2004-11-26 2006-06-01 Webasto Ag Procede pour realiser un echangeur thermique
US8910881B2 (en) 2004-11-26 2014-12-16 Webasto Ag Air heater for a motor vehicle
WO2008138988A1 (fr) * 2007-05-14 2008-11-20 Shell Internationale Research Maatschappij B.V. Dispositif d'échange thermique indirect et procédé d'échange thermique
AU2008249955B2 (en) * 2007-05-14 2011-01-20 Shell Internationale Research Maatschappij B.V. Indirect heat exchange device and method of exchanging heat
CN105486148A (zh) * 2015-12-31 2016-04-13 无锡辉腾科技有限公司 一种用于空浴式汽化器的翅片换热管
CN108513375A (zh) * 2018-06-08 2018-09-07 北京汉能光伏投资有限公司 一种加热管及包含其的加热装置

Also Published As

Publication number Publication date
NL9301995A (nl) 1995-06-16

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