DE2840744A1 - Tubular metal heat exchanger with barrel fins mfr. - by rolling strip into split flange Z=section for spiral winding and welding - Google Patents

Tubular metal heat exchanger with barrel fins mfr. - by rolling strip into split flange Z=section for spiral winding and welding

Info

Publication number
DE2840744A1
DE2840744A1 DE19782840744 DE2840744A DE2840744A1 DE 2840744 A1 DE2840744 A1 DE 2840744A1 DE 19782840744 DE19782840744 DE 19782840744 DE 2840744 A DE2840744 A DE 2840744A DE 2840744 A1 DE2840744 A1 DE 2840744A1
Authority
DE
Germany
Prior art keywords
sheet metal
rollers
heat exchanger
welding
fins
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
DE19782840744
Other languages
German (de)
Other versions
DE2840744C2 (en
Inventor
Hendrik Rombaut
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to DE19782840744 priority Critical patent/DE2840744C2/en
Priority to BE0/197131A priority patent/BE878770A/en
Publication of DE2840744A1 publication Critical patent/DE2840744A1/en
Application granted granted Critical
Publication of DE2840744C2 publication Critical patent/DE2840744C2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/26—Making finned or ribbed tubes by fixing strip or like material to tubes helically-ribbed tubes
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The process is used in the fabrication of a tubular metal heat exchanger (16) with internal (4') and external (12) fins entailing passing a uniformly wide strip through four successive pairs of rollers before spiral winding and welding along a helical seam. The first set of rollers (6) cut uniformly long slits (3, 4) normal to band length, at regular intervals in each edge, and forming continuous lines of adjacent rectangular flaps (3', 4'). Folding of the two subdivided edges in opposite directions is effected by the second set of rollers (8), and the third set (9) gives each line of flaps a bi-planar profile. Finally the fourth set of rollers (10) effects the individual twisting of the internal flaps (4') or fins. A further set of rollers may be introduced and be used to twist external fins, welding being effected by electric currents of high, hyper or radio frequencies.

Description

"Verfahren und Vorrichtung zum Herstellen eines Wärmetauscher-"Method and device for producing a heat exchanger

rohres" Die Erfindung betrifft ein Verfahren und eine hierfür dienende Vorrichtung zum Herstellen eines Wärmetauscherrohres mit Rippen auf seiner Außen- und Innenseite aus einem Blechband. pipe "The invention relates to a method and a method used therefor Device for producing a heat exchanger tube with ribs on its outer and inside from a sheet metal strip.

Ein bekanntes Verfahren zum Herstellen eines Rippenrohres aus einem Blechband, bei dem nur auf seiner Außenseite Rippen angeordnet sind, ist in der DT-OS 19 18 820 beschrieben. Hierbei werden die Außenrippen in der Weise erzeugt, daß zuerst mit einem Stanzwerkzeug aus einer Längsseite das Bandes schmale Flächenteile herausgestanzt werden, die von der Blechkante bis zu einer zur Bandachse parallelen Linie reichen, daß dann die zwischen den Stanzschnitten verbliebenen Flächen aus der Bandebene etwa senkrecht umgebogen werden und daß dann das Band spiralig gewickelt wird wobei sich ein Rohr mit einander überlappenden Windungen ergibt, von dem die umgebogenen Bandteile als Rippen nach außen abstehen.A known method of making a finned tube from a Sheet metal strip, in which ribs are arranged only on its outside, is in the DT-OS 19 18 820 described. The outer ribs are created in such a way that that first with a punching tool from one long side of the tape narrow surface parts be punched out from the sheet edge to a parallel to the strip axis Lines are sufficient so that the areas remaining between the die cuts are sufficient the tape plane are bent approximately vertically and that the tape is then wound spirally is resulting in a tube with overlapping turns, of which the bent parts of the band protrude outwards as ribs.

Die Uberlappungen müssen in der Weise gestaltet werden, daß das Rohr dicht ist, oder es müssen hierfür besondere Maßnahmen getroffen werden.The overlaps must be designed in such a way that the pipe is tight, or special measures must be taken for this.

Die Herstellung eines Wärmetauscherrohres mit Innenrippen ist in der DT-OS 14 52 455 beschrieben. Danach wird eine aus einer bandartigen Lamelle spiralförmig gewickelte Rippe in das Rohr eingeführt und mit der Rohrinnenfläche durch Löten verbunden.The manufacture of a heat exchanger tube with internal fins is in the DT-OS 14 52 455 described. After that, one made of a ribbon-like lamella becomes spiral Coiled rib inserted into the pipe and connected to the inner surface of the pipe by soldering tied together.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, womit es ermöglicht wird, in einfacher und wirtschaftlicher Weise und in einem einzigen kontinuierlichen Arbeitsgang ein Wärmetauscherrohr herzustellen, welches sowohl außen wie auch innen mit Rippen versehen ist.The invention is based on the object of a method and a device to create what makes it possible, in a simple and economical way and to produce a heat exchanger tube in a single continuous operation, which is provided with ribs both outside and inside.

Gelöst wird die Aufgabe mit den im Hauptanspruch angegebenen Maßnahme und Mitteln.The problem is solved with the measure specified in the main claim and means.

Vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen.Advantageous refinements result from the subclaims.

In den Zeichnungen ist ein Ausführungsbeispiel der Erfindung dargestellt, und zwar zeigen: Fig. 1 in schematischer Darstellung den Verfahrensablauf mit den hierfür wesentlichen Vorrichtungen, Fig. 2 die Einrichtung für das Erzeugen der Bandeinschnitte, Fig. 3 das mit den Einschnitten versehene Blechband, Fig. 4 und Fig. 5 die für das Abbiegen der Blechzungen dienenden Walzenrollen, Fig. 6 die Einrichtung zum Verdrehen der inneren und/oder äußeren Blechzungen quer zur Längsrichtung des Blechbandes, Fig. 7 die für das schraubenlinienförmige Wickeln des Blechbandes und für das Verschweißen der Kanten dienende Einrichtung, Fig. 8 eine Einzelheit der Schweißstelle, Fig. 9 das fertige Wärmetauscherrohr in Vorderansicht mit verdrehten Innenrippen, Eig. 9a das Wärmetauscherrohr mit verdrehten Außen- und Innenrippen, Fig. 10 einen Längsschnitt gemäß der Linie I - I, Fig. 11 einen Teil des fertigen Wärmetauscherrohres in perspektivischer Ansicht mit verdrehten Innenrippen und Fig. 11a mit verdrehten Außen- und Innenrippen.In the drawings, an embodiment of the invention is shown, namely show: FIG. 1 a schematic representation of the process sequence with the essential devices for this, Fig. 2 shows the device for generating the Strip incisions, Fig. 3 the sheet metal strip provided with the incisions, Fig. 4 and FIG. 5 shows the roller rollers used for bending the sheet metal tongues, FIG. 6 shows the device for turning the inner and / or outer sheet metal tongues transversely to the longitudinal direction of the Sheet metal strip, Fig. 7 for the helical winding of the sheet metal strip and device used for welding the edges, Fig. 8 a Detail of the weld, FIG. 9 the finished heat exchanger tube in a front view with twisted inner ribs, prop. 9a the heat exchanger tube with twisted outer and inner ribs, FIG. 10 a longitudinal section along the line I - I, FIG. 11 a Part of the finished heat exchanger tube in a perspective view with twisted Inner ribs and FIG. 11a with twisted outer and inner ribs.

In der Darstellung gemäß Fig. 1 wird das Blechband 1 von dem Haspelband 2 abgezogen und zunächst an seinen beiden Längsseiten mit den Einschnitten 3 bzw. 4 versehen. Hierfür dienen die beiden übereinander angeordneten Rollenpaare 5 und 6, zwischen denen das Band hindurch geführt wird. Diese sind zahnradförmig ausgebildet und weisen die schrafen sägezahnähnlichen Schnittkanten 7 auf, mit denen die Einschnitte 3 und 4 erzeugt werden. Im unmittelbaren Anschluß daran werden die von den Einschnitten gebildeten Blechzungen 3' und 4' aus der Bandebene abgebogen, und zwar die Zungen 3' nach oben und die Zungen 4' nach unten. Hierfür dienen die Biegerollenpaare 8 und 9, von denen das Rollenpaar 8 eine Biegung um etwa 450 und die Rollenpaare 9 eine Biegung in die Senkrechten bewirken. Danach werden die Blechzungen 4t, welche die Innenrippen bilden, quer zur Längsrichtung des Blechbandes mit Hilfe des zahnradähnlichen Rollenpaares 10 verdreht, welches hierfür ausgebildete Zähne 11 aufweist. Das in dieser Weise zugerichtete Band gelangt dann zu der Wickel- und Schweißstelle 12, wo es schraubenlinienförmig zum Rohr gewickelt wird. Hierfür dienen die Biegerollen 13, die in an sich bekannter Weise käfigartig angeordnet sind (Fig. 7). Im Inneren des sich bildenden Rohres ist eine Andrückrolle 14 vorgesehen. Bei dem Wickelvorgang werden die Längskanten 15 des unverformt gebliebenen Bandmittelteiles 16 aneinander gedrückt und miteinander mittels hoch-, ultra- oder radiofrequenter Ströme verschweißt. Die Stromzufuhr erfolgt mit den Schleif- oder Rollenkontakten 17 und 18 (Fig. 8). Die Rollen 19 und 20 dienen zum Aneinanderpressen der Längskanten 15.In the illustration according to FIG. 1, the sheet metal strip 1 is removed from the reel strip 2 peeled off and first on both of its long sides with the incisions 3 resp. 4 provided. The two pairs of rollers 5 and arranged one above the other are used for this purpose 6, between which the tape is passed. These are gear-shaped and have the sharp sawtooth-like cutting edges 7 with which the incisions 3 and 4 are generated. Immediately afterwards, the incisions are made formed sheet metal tongues 3 'and 4' bent from the band plane, namely the tongues 3 'up and the tongues 4' down. The bending roller pairs 8 are used for this and 9, of which the roller pair 8 has a bend of approximately 450 and the roller pairs 9 cause a bend in the vertical. Then the sheet metal tongues 4t, which form the inner ribs, transversely to the longitudinal direction of the sheet metal strip with the help of the gear-like Twisted roller pair 10, which has teeth 11 designed for this purpose. This in The tape prepared in this way then arrives at the winding and welding point 12, where it is helically wrapped to the pipe. The bending rollers are used for this 13, which are arranged in a manner known per se in the manner of a cage (FIG. 7). Internally of the pipe being formed a pressure roller 14 is provided. at the winding process, the longitudinal edges 15 of the undeformed tape middle part 16 pressed together and with each other by means of high, ultra or radio frequency Streams welded. Power is supplied via the sliding or roller contacts 17 and 18 (Fig. 8). The rollers 19 and 20 are used to press the longitudinal edges together 15th

Gemäß den Fig. 9 bis 11 weist das fertige Wärmetauscherrohr die Außenrippen 21 und die Innenrippen 22 auf. In diesem Beispiel sind die Außenrippen mit ihren Flächen in Rohrumfangsrichtung und diewenigen der Innenrippen in Richtung der Rohrachse angeordnet. Ein derartiges Rohr ist für den Wärmeaustausch von zwei strömenden Medien vorgesehen, deren Strömungsrichtungen zueinander senkrecht sind. Soll der äußere Strom parallel zu dem inneren Strom geführt werden, so können die Blechzungen 3', welche die Außenrippen bilden, vor dem Wickeln und Verschweißen des Blechbandes in ähnlicher Weise wie die Innenrippen verdreht werden (Fig. 9a und 11a).According to FIGS. 9 to 11, the finished heat exchanger tube has the outer ribs 21 and the inner ribs 22. In this example, the outer ribs are with theirs Areas in the circumferential direction of the pipe and the few of the inner ribs in the direction of the pipe axis arranged. Such a tube is for the heat exchange of two flowing media provided, the flow directions of which are perpendicular to each other. Should the outer one Current are conducted in parallel to the inner current, the sheet metal tongues 3 ', which form the outer ribs, before winding and welding the sheet metal strip in a similar way as the inner ribs are twisted (Fig. 9a and 11a).

Es liegt im Rahmen der Erfindung, die Blechzungen 4' bzw. 3' auch nur um einen Teilbetrag zu verdrehen, wobei dann entsprechend ausgebildete Rollenpaare vorgesehen sind.It is within the scope of the invention for the sheet metal tongues 4 'and 3' as well to twist only by a partial amount, in which case appropriately designed pairs of rollers are provided.

Claims (5)

Patentansprüche: W Verfahren zum Herstellen eines Wärmetauscherrohres mit Außen- und Innenrippen aus einem Blechband, dadurch gekennzeichnet, daß beide Längsseiten des Blechbandes mit Einschnitten versehen werden, die sich von den Längskanten bis zu jeweils einer zur Bandmittellinie parallelen Linie erstrecken und voneinander den gleichen Abstand haben, daß dann die von den Einschnitten gebildeten zungenartigen Blechabschnitte der einen Längs seite aus der Bandebene zur Bildung von Außenrippen nach oben und diejenigen der gegenüberliegenden Längsseite zur Bildung von Innenrippen nach unten gebogen sowie quer zur Längsrichtung des Blechbandes verdreht werden, worauf die durch das Abbiegen des Blechabschnitte gebildeten Bandkanten durch schraubenlinienförmiges Wickeln aneinandergedrückt und miteinander verschweißt werden. Claims: W Method for producing a heat exchanger tube with outer and inner ribs made from a sheet metal strip, characterized in that both Long sides of the sheet metal strip are provided with incisions that extend from the longitudinal edges extend up to a line parallel to the belt center line and from each other have the same distance that then the tongue-like formed by the incisions Sheet metal sections of one longitudinal side from the strip plane to form outer ribs upwards and those on the opposite long side to form inner ribs bent downwards and twisted transversely to the longitudinal direction of the sheet metal strip, whereupon the band edges formed by the bending of the sheet metal section by helical Coils are pressed together and welded together. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß auch die nach oben gebogenen Blechabschnitte für die Außenrippen quer zur Längsrichtung des Blechbandes verdreht werden. 2. The method according to claim 1, characterized in that the upwardly bent sheet metal sections for the outer ribs transversely to the longitudinal direction of the Sheet metal strip are twisted. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß das Verschweißen der Bandkanten in an sich bekannter Weise elektrisch durch Zufuhr hoch-, ultra- oder radiofrequenter Ströme erfolgt. 3. The method according to claims 1 and 2, characterized in that that the welding of the tape edges electrically in a known manner High, ultra or radio frequency currents are supplied. 4. Vorrichtung zum Durchführen des Verfahrens nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß für das Erzeugen der Blecheinschnitte (3, 4) zwei angetriebene, senkrecht übereinander angeordnete Rollenpaare (5, 6) mit sägezahnartigen Schneidkanten (7) über und unter jeder Längsseite des Blechbandes (1) angeordnet sind, denen im Abstand davon zwei oder mehrere profXlierte angetriebene Walzenrollenpaare (8, 9) zum Abbiegen der Blechzungen (3', 4') nachgeSchaltet sind, und daß vor den zum schraubenlinienförmigen Wickeln des Bandes dienenden Biegerollen (13) ein die nach unten abgebogenen Blechzungen (4') in Richtung der Rohrachse verdrehendes Rollenpaar (10) mit entsprechend ausgebildeten Zähnen (11) und mit senkrechten angetriebenen Achsen angeordnet ist.4. Device for performing the method according to the claims 1 to 3, characterized in that for making the sheet metal incisions (3, 4) two driven pairs of rollers (5, 6) arranged vertically one above the other with sawtooth-like Cutting edges (7) arranged above and below each longitudinal side of the sheet metal strip (1) are to which two or more profiles are spaced apart powered Roller pairs (8, 9) for bending the sheet metal tongues (3 ', 4') are connected downstream, and that in front of the bending rollers used for the helical winding of the tape (13) a downwardly bent sheet metal tongues (4 ') twisting in the direction of the pipe axis Pair of rollers (10) with appropriately designed teeth (11) and with vertical driven ones Axes is arranged. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß zusätzlich zu dem Rollenpaar (10, 11) ein entsprechend ausgebildetes, die nach oben abgebogenen Blechzungen (3') verdrehendes Rollenpaar vorgesehen ist.5. Apparatus according to claim 4, characterized in that in addition for the pair of rollers (10, 11) a correspondingly designed, which is bent upwards Sheet metal tongues (3 ') twisting pair of rollers is provided.
DE19782840744 1978-09-15 1978-09-15 Method and device for manufacturing a heat exchanger tube Expired DE2840744C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19782840744 DE2840744C2 (en) 1978-09-15 1978-09-15 Method and device for manufacturing a heat exchanger tube
BE0/197131A BE878770A (en) 1978-09-15 1979-09-13 METHOD AND DEVICE FOR THE MANUFACTURE OF A HEAT EXCHANGER TUBE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782840744 DE2840744C2 (en) 1978-09-15 1978-09-15 Method and device for manufacturing a heat exchanger tube

Publications (2)

Publication Number Publication Date
DE2840744A1 true DE2840744A1 (en) 1980-03-27
DE2840744C2 DE2840744C2 (en) 1985-08-01

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ID=6049849

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782840744 Expired DE2840744C2 (en) 1978-09-15 1978-09-15 Method and device for manufacturing a heat exchanger tube

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BE (1) BE878770A (en)
DE (1) DE2840744C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581800A (en) * 1984-08-16 1986-04-15 Sundstrand Heat Transfer, Inc. Method of making a segmented externally finned heat exchanger tube

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932610A (en) * 1932-10-25 1933-10-31 Tilley Edwin Frost Radiation device
US3255516A (en) * 1963-09-03 1966-06-14 Ohio Crankshaft Co Method and apparatus of producing heat exchanger tubing
DE2131085A1 (en) * 1970-06-25 1971-12-30 Escoa Fintube Corp Fanned ribbed tube and method for its manufacture
DE2134229A1 (en) * 1970-07-13 1972-01-20 Gen Electric Method and apparatus for loading pipes
DE2330497B2 (en) * 1973-06-15 1979-04-12 Metallschlauch-Fabrik Pforzheim (Vorm. Hch. Witzenmann) Gmbh, 7530 Pforzheim Finned tube for heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932610A (en) * 1932-10-25 1933-10-31 Tilley Edwin Frost Radiation device
US3255516A (en) * 1963-09-03 1966-06-14 Ohio Crankshaft Co Method and apparatus of producing heat exchanger tubing
DE2131085A1 (en) * 1970-06-25 1971-12-30 Escoa Fintube Corp Fanned ribbed tube and method for its manufacture
DE2134229A1 (en) * 1970-07-13 1972-01-20 Gen Electric Method and apparatus for loading pipes
DE2330497B2 (en) * 1973-06-15 1979-04-12 Metallschlauch-Fabrik Pforzheim (Vorm. Hch. Witzenmann) Gmbh, 7530 Pforzheim Finned tube for heat exchanger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581800A (en) * 1984-08-16 1986-04-15 Sundstrand Heat Transfer, Inc. Method of making a segmented externally finned heat exchanger tube

Also Published As

Publication number Publication date
DE2840744C2 (en) 1985-08-01
BE878770A (en) 1979-12-31

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