EP0301121B1 - Finned tube - Google Patents

Finned tube Download PDF

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Publication number
EP0301121B1
EP0301121B1 EP19870111019 EP87111019A EP0301121B1 EP 0301121 B1 EP0301121 B1 EP 0301121B1 EP 19870111019 EP19870111019 EP 19870111019 EP 87111019 A EP87111019 A EP 87111019A EP 0301121 B1 EP0301121 B1 EP 0301121B1
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EP
European Patent Office
Prior art keywords
finned tube
fin
tube according
range
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.)
Revoked
Application number
EP19870111019
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German (de)
French (fr)
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EP0301121A1 (en
Inventor
Manfred Dr.-Ing. Hage
Manfred Dipl.-Ing. Knab
Karl Dipl.-Ing. Noll
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.)
Wieland Werke AG
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Wieland Werke AG
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Application filed by Wieland Werke AG filed Critical Wieland Werke AG
Priority to EP19870111019 priority Critical patent/EP0301121B1/en
Priority to DE8787111019T priority patent/DE3762920D1/en
Publication of EP0301121A1 publication Critical patent/EP0301121A1/en
Application granted granted Critical
Publication of EP0301121B1 publication Critical patent/EP0301121B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • 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
    • F28F1/006—Tubular elements; Assemblies of tubular elements with variable shape, e.g. with modified tube ends, with different geometrical features

Definitions

  • the invention relates to a finned tube according to the preamble of claim 1.
  • Finned tubes of this type with a fin height h R of about 10 mm are used in particular in air-cooled heat exchangers.
  • a relatively small fin pitch t R ⁇ 1.34 mm (at least 19 finned inches) is assigned a relatively small fin height h R of 0.8 to 1.25 mm.
  • the invention has for its object to provide a finned tube that retains good heat transfer properties even when used in corrosive, erosive and contaminated media.
  • the object is achieved by the characterizing features a) and b) of claim 1 (the rib cross-sectional area A R is measured in the longitudinal direction of the tube).
  • the rib height h R is preferably in the range 0.8 mm ⁇ h R ⁇ 1.7 mm, in particular in the range 1.0 mm ⁇ h R ⁇ 1.5 mm.
  • the values for the surface ratio of the corrugated outer surface Ao / smooth outer surface Ao, smooth as a function of the rib pitch t R lie between the values of the equations.
  • the smooth tube has an outer diameter which corresponds to the fin diameter of the finned tube.
  • a rib width B> 0.3 mm at the tip of the rib is preferred.
  • the finned tube For use in shell and tube heat exchangers, it is recommended that the finned tube have smooth ends, the diameter of which roughly corresponds to the fin diameter.
  • the finned tube in corrosive or erosive media, it preferably consists of a corrosion-resistant metallic material, such as steel, high-alloy steel or titanium.
  • finned tube according to the invention for heat exchangers for condensation and evaporation as well as heat transfer without phase change (on the tube outside) of corrosive and erosive substances which have a critical pressure p crit ⁇ 200 bar is preferred. Because of the favorable surface area, these finned tubes are also ideally suited for use in contaminated process streams.
  • Particularly suitable substances of this type are hydrocarbon mixtures from chemistry or petrochemicals, for example ethylene / propylene, n-pentane / para-xylene.
  • Fig. 3 shows a finned tube 1 with integral fins 2, which run helically around the outside of the tube.
  • the finned tubes 1 are produced in a manner known per se by the finned tube rolling method (cf. for example US Pat. No. 3,327,512).
  • FIG. 4 clearly shows, the ribs 2 taper towards the tip of the rib, the bottom of the groove between the ribs 2 is rounded.
  • rib pitch t R distance from rib center to rib center
  • rib height h R rib cross-sectional area A R (hatched in Fig. 4)
  • rib width B at the rib tip radius R in the groove base
  • Rib diameter d R inside diameter of the tube (in the finned part) di.
  • the finned tube 1 has a smooth end 1 ', the diameter of which corresponds to the fin diameter d R.
  • condensation performance of the condenser equipped with finned tubes according to the invention was at least a factor 2 higher than the condensation performance of the condenser provided with standard finned tubes.

Description

Die Erfindung betrifft ein Rippenrohr nach dem Oberbegriff des Anspruchs 1.The invention relates to a finned tube according to the preamble of claim 1.

Es sind Rippenrohre mit dem angegebenen Bereich der Teilung tR von 1,60 bis 3,90 mm (6,5 bis 16 Rippen/Zoll) bekannt.Finned tubes with the specified range of pitch t R of 1.60 to 3.90 mm (6.5 to 16 fins / inch) are known.

Rippenrohre dieser Art mit einer Rippenhöhe hR von etwa über 10 mm werden insbesondere in luftgekühlten Wärmeaustauschern eingesetzt.Finned tubes of this type with a fin height h R of about 10 mm are used in particular in air-cooled heat exchangers.

Aus der DE-A 2 303 192 sind ebenfalls Rippenrohre bekannt, bei denen einer relativ großen Rippenteilung tR von 2,12 bis 2,54 mm (10-12 Rippen/Zoll) eine relativ große Rippenhöhe h R von mehr als 2,54 mm zugeordnet ist.From DE-A 2 303 192 finned tubes are also known in which a relatively large fin pitch t R of 2.12 to 2.54 mm (10-12 fins / inch) has a relatively large fin height h R of more than 2.54 mm is assigned.

Eine Verwendung dieser Rippenrohre bei korrosiven, erosiven und verunreinigten Medien, wie sie beispielsweise im Bereich der Chemie und Petrochemie auftreten, ist bereits deshalb ausgeschlossen, weil die Nuten zwischen den Rippen leicht mit Ablagerungen angefüllt würden und damit die Leistung des Rippenrohres als Wärmeübertragungselement wesentlich beeinträchtigt würde.The use of these finned tubes in corrosive, erosive and contaminated media, such as occur in the chemical and petrochemical sector, is already ruled out because the grooves between the fins would easily be filled with deposits and the performance of the finned tube as a heat transfer element would be significantly impaired .

Bei den Rippenrohren nach der DE-A 2 119 245 ist einer relativ kleinen Rippenteilung tR < 1,34 mm (mindestens 19 RippenlZoll) eine relativ kleine Rippenhöhe hR von 0,8 bis 1,25 mm zugeordnet. Der Erfindung liegt die Aufgabe zugrunde, ein Rippenrohr anzugeben, das auch bei der Verwendung in korrosiven, erosiven und verunreinigten Medien gute Wärmeübertragungseigenschaften behält. Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale a) und b) des Anspruchs 1 gelöst (Die Rippenquerschnittsfläche AR wird dabei in Rohrlängsrichtung gemessen).In the finned tubes according to DE-A 2 119 245, a relatively small fin pitch t R <1.34 mm (at least 19 finned inches) is assigned a relatively small fin height h R of 0.8 to 1.25 mm. The invention has for its object to provide a finned tube that retains good heat transfer properties even when used in corrosive, erosive and contaminated media. The object is achieved by the characterizing features a) and b) of claim 1 (the rib cross-sectional area A R is measured in the longitudinal direction of the tube).

Damit wird einerseits eine offene Rippenstruktur vorgeschlagen, die einer Verschmutzung der Nuten zwischen den Rippen entgegenwirkt, und andererseits wird eine relativ massive Rippe zur Verfügung gestellt, die widerstandsfähig ist gegen die Angriffe der korroviven und erosiven Medien.On the one hand, this proposes an open rib structure that counteracts contamination of the grooves between the ribs, and on the other hand provides a relatively solid rib that is resistant to the attacks of the corrovive and erosive media.

Die Rippenhöhe hR liegt vorzugsweise im Bereich 0,8 mm < hR < 1,7 mm, insbesondere im Bereich 1,0 mm < hR < 1,5 mm. Nach einer besonderen Ausführungsform der Erfindung liegen die Werte für das Verhältnis tR / hR im Bereich 1,2 < tR / hR < 5, insbesondere im Bereich 1,3 < tR / hR < 3,2. Es empfiehlt sich, die Werte für die Rippenquerschnittsfläche AR als Funktion der Rippenhöhe hR zwischen den Werten der Gleichungen AR = 0,5 mm hR und AR = 0,7 mm2 + 1 mm hR zu wählen (vgl. das Diagramm in Fig. 1). Nach einer weiteren Ausführungsform der Erfindung liegen die Werte für das Oberflächenverhältnis der berippten Außen-Oberfläche Ao/ glatter Außen-Oberfläche Ao, glatt als Funktion der Rippenteilung tR zwischen den Werten der Gleichungen. Ao / Ao, glatt = 1,05 und Ao / Ao, glatt = 1,49 + 0,214 . (tR -3,97)2, vgl. Fig. 2 mit tR in mm. Bei diesem Vergleich hat das Glattrohr einen Außendurchmesser, der dem Rippendurchmesser des Rippenrohres entspricht.The rib height h R is preferably in the range 0.8 mm <h R <1.7 mm, in particular in the range 1.0 mm <h R <1.5 mm. According to a special embodiment of the invention, the values for the ratio t R / h R are in the range 1.2 <t R / h R <5, in particular in the range 1.3 <t R / h R <3.2. It is advisable to choose the values for the rib cross-sectional area A R as a function of the rib height h R between the values of the equations A R = 0.5 mm hR and A R = 0.7 mm 2 + 1 mm hR (cf. the diagram in Fig. 1). According to a further embodiment of the invention, the values for the surface ratio of the corrugated outer surface Ao / smooth outer surface Ao, smooth as a function of the rib pitch t R, lie between the values of the equations. Ao / Ao, smooth = 1.05 and Ao / Ao, smooth = 1.49 + 0.214. (t R -3.97) 2 , cf. Fig. 2 with t R in mm. In this comparison, the smooth tube has an outer diameter which corresponds to the fin diameter of the finned tube.

Für die Herstellung mittels des üblichen Rippenrohr-Walzverfahrens empfiehlt es sich, daß die Rippen zur Rippenspitze hin konisch zulaufen. Eine Rippenbreite B > 0,3 mm an der Rippenspitze ist dabei bevorzugt.For the production by means of the usual finned tube rolling process, it is recommended that the fins taper towards the fin tip. A rib width B> 0.3 mm at the tip of the rib is preferred.

Für die Verwendung in Rohrbündelwärmeaustauschem empfiehlt es sich, wenn das Rippenrohr glatte Enden aufweist, deren Durchmesser in etwa dem Rippendurchmesser entspricht.For use in shell and tube heat exchangers, it is recommended that the finned tube have smooth ends, the diameter of which roughly corresponds to the fin diameter.

Für die Verwendung des Rippenrohres in korrosiven bzw. erosiven Medien besteht es vorzugsweise aus einem korrosionsbeständigen metallischen Werkstoff, wie etwa Stahl, hochlegiertem Stahl oder Titan.For the use of the finned tube in corrosive or erosive media, it preferably consists of a corrosion-resistant metallic material, such as steel, high-alloy steel or titanium.

Die Verwendung des erfindungsgemäßen Rippenrohres für Wärmeaustauscher sowohl für Kondensation und Verdampfung als auch Wärmeübertragung ohne Phasenwechsel (auf der Rohraußenseite) von korrosiven und erosiven Stoffen, die einen kritischen Druck p krit < 200 bar haben, ist bevorzugt. Wegen des günstigen Oberflächenverhäftnisses sind diese Rippenrohre ebenfalls ausgezeichnet für den Einsatz in verunreinigten Prozeßströmen geeignet.The use of the finned tube according to the invention for heat exchangers for condensation and evaporation as well as heat transfer without phase change (on the tube outside) of corrosive and erosive substances which have a critical pressure p crit <200 bar is preferred. Because of the favorable surface area, these finned tubes are also ideally suited for use in contaminated process streams.

Als Stoffe dieser Art kommen insbesondere Kohlenwasserstoffgemische aus der Chemie oder Petrochemie in Frage, beispielsweise Äthylen / Propylen, n-Pentan/Para-Xylol.Particularly suitable substances of this type are hydrocarbon mixtures from chemistry or petrochemicals, for example ethylene / propylene, n-pentane / para-xylene.

Die Erfindung wird an Hand der folgenden Ausführungsbeispiele näher erläutert. Es zeigt

  • Fig. 3 einen Längsschnitt durch ein Rippenrohr,
  • Fig. 4 in vergößertem Maßstab einen Teillängsschnitt durch ein Rippenrohr,
  • Fig. 5 ein Foto eines Längsschliffes eines Rippenrohres,
  • Fig. 6 den Einsatz der Rippenrohre in einem Rohrbündel.
The invention is explained in more detail using the following exemplary embodiments. It shows
  • 3 shows a longitudinal section through a finned tube,
  • 4 in an enlarged scale a partial longitudinal section through a finned tube,
  • 5 is a photo of a longitudinal section of a finned tube,
  • Fig. 6 shows the use of finned tubes in a tube bundle.

Die Fig. 3 zeigt ein Rippenrohr 1 mit integralen Rippen 2, die auf der Rohraußenseite schraubenlinienförmig umlaufen. Die Herstellung der Rippenrohre 1 erfolgt in an sich bekannter Weise nach dem Rippenrohrwalzverfahren (vgl. beispielsweise US-PS 3.327.512). Wie Fig. 4 deutlich zeigt, laufen die Rippen 2 konisch zur Rippenspitze zu, der Nutengrund zwischen den Rippen 2 ist ausgerundet.Fig. 3 shows a finned tube 1 with integral fins 2, which run helically around the outside of the tube. The finned tubes 1 are produced in a manner known per se by the finned tube rolling method (cf. for example US Pat. No. 3,327,512). As FIG. 4 clearly shows, the ribs 2 taper towards the tip of the rib, the bottom of the groove between the ribs 2 is rounded.

An Hand der Fig. 3/4 sind die Rippenrohrgrößen erläutert: Rippenteilung tR (Abstand von Rippenmitte zur Rippenmitte), Rippenhöhe hR, Rippenquerschnittftäche AR (in Fig. 4 schraffiert), Rippenbreite B an der Rippenspitze, Radius R im Nutengrund, Rippendurchmesser dR, Innendurchmesser des Rohres (im berippten Teil) di.3/4 the rib tube sizes are explained: rib pitch t R (distance from rib center to rib center), rib height h R , rib cross-sectional area A R (hatched in Fig. 4), rib width B at the rib tip, radius R in the groove base, Rib diameter d R , inside diameter of the tube (in the finned part) di.

Aus Fig. 3 geht deutlich hervor, daß das Rippenrohr 1 ein glattes Ende 1' aufweist, dessen Durchmesser dem Rippendurchmesser dR entspricht.From Fig. 3 it is clear that the finned tube 1 has a smooth end 1 ', the diameter of which corresponds to the fin diameter d R.

BeisDiel:Example:

Es wurden Rippenrohre 1 aus Edelstahl 1,4571 mit 11,2 Rippen/Zoll (tR = 2,27 mm) mit den Abmessungen nach folgender Tabelle hergestellt:

Figure imgb0001
Finned tubes 1 were manufactured from stainless steel 1.4571 with 11.2 fins / inch (t R = 2.27 mm) with the dimensions according to the following table:
Figure imgb0001

Damit ist tR/hR =1,63; AR/hR = 0,62 mm.
Ein Längsschliff durch die so hergestellten Rohre ist mit dem Foto nach Fig. 5 gezeigt die Rohrinnenseite ist glatt. Rippenrohre und Vergleichsrippenrohre (Standardrippenrohre mit 19 Rippen/Zoll und demselben Rippendurchmesser dR) wurden jeweils in einem Rohrbündel-Kondensator 3 nach Fig. 6 eingesetzt (also Wasser im Rohr, kondensierendes Kohlenwasserstoffgemisch - CnHm-Gemisch - außen).Thus t R / h R = 1.63; A R / h R = 0.62 mm.
A longitudinal grinding through the pipes produced in this way is shown in the photo according to FIG. 5, the inside of the pipe is smooth. Finned tubes and comparison finned tubes (standard finned tubes with 19 fins / inch and the same fin diameter d R ) were each used in a tube bundle condenser 3 according to FIG. 6 (i.e. water in the tube, condensing hydrocarbon mixture - C n H m mixture - outside).

Es zeigte sich, daß die Kondensationsleistung des mit erfindungsgemäßen Rippenrohren bestückten Kondensators mindestens um den Faktor 2 höher lag als die Kondensationsleistung des mit Standard-Rippenrohren versehenen Kondensators.It was found that the condensation performance of the condenser equipped with finned tubes according to the invention was at least a factor 2 higher than the condensation performance of the condenser provided with standard finned tubes.

Claims (13)

1. Finned tube (1), particularly for heat exchangers, with helically extending or annular fins (2) formed integrally on the outer surface of the tube wherein the fins (2) are defined by the dimensions fin spacing tR, fin height hR and cross-sectoinal area of the fin AR, wherein the spacing tR is in the range of 1.6 to 3.9 mm (6.5 to 16 fins per inch) and the ratio of cross-sectional area of the fin AR to fin height hR is greater than 0.5 mm, wherein
a) the fin height hR is in the range of 0.2 mm to 2.0 mm;
b) the ratio of fin spacing tR to fin height hR is in the range of 1 to 15.
2. Finned tube according to claim 1, wherein the fin height hR is in the range of 0.8 to 1.7 mm.
3. Finned tube according to claim 2, wherein the fin height hR is in the range of 1.0 to 1.5 mm.
4. Finned tube according to claims 1 to 3, wherein the ratio tR/hR is in the range of 1.2 to 5.
5. Finned tube according to claim 4, wherein the ratio tR/hR is in the range of 1.3 to 3.2
6. Finned tube according to one or several of claims 1 to 5, wherein the cross-sectional surface area AR of the fin as a function of the fin height hR ranges between 0.5 mm- hR and 0.7 mm2 + 1 mm . hR (Fig. 1).
7. Finned tube according to one or several of claims 1 to 6, wherein the ratio of the outer surface area Ao of the finned tube relative to the outer surface area Ao, smooth of a smooth tube ranges between 1.05 and 1.49 + 0.214 (tR - 3.97)2 (Fig. 2 with tR in mm).
8. Finned tube according to one or several of claims 1 to 6, wherein the fins (2) extend conically toward the fin ends.
9. Finned tube according to claim 8, wherein the fins have a width B at the ends thereof of greater than 0.3 mm.
10. Finned tube according to one or several of claims 1 to 9, the tube having smooth ends (1'), the ends having a diameter which corresponds approximately to the fin diameter dR.
11. Finned tube according to one or several of claims 1 to 10, wherein the material of the tube is corrosion-resistant metal, such as steel, high-alloy steel or titanium.
12. Use of a finned tube according to one or several fo claims 1 to 11 in heat exchangers for condensing, evaporating or heat transfer without phase change of corrosive and erosive substances having a critical pressure of less than 200 bars.
13. Use of a finned tube for heat exchangers according to claim 12, wherein the substances are hydrocarbon mixtures.
EP19870111019 1987-07-30 1987-07-30 Finned tube Revoked EP0301121B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19870111019 EP0301121B1 (en) 1987-07-30 1987-07-30 Finned tube
DE8787111019T DE3762920D1 (en) 1987-07-30 1987-07-30 RIB TUBE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19870111019 EP0301121B1 (en) 1987-07-30 1987-07-30 Finned tube

Publications (2)

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EP0301121A1 EP0301121A1 (en) 1989-02-01
EP0301121B1 true EP0301121B1 (en) 1990-05-23

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5832995A (en) * 1994-09-12 1998-11-10 Carrier Corporation Heat transfer tube
FR2756090A1 (en) * 1996-11-19 1998-05-22 Transnucleaire GRID DEVICE FOR EXTERNAL COOLING OF CONTAINERS FOR RADIOACTIVE MATERIALS
US6298673B1 (en) * 2000-05-18 2001-10-09 Carrier Corporation Method of operating a refrigerated merchandiser system
WO2005068927A1 (en) * 2004-01-07 2005-07-28 Dow Global Technologies Inc. Method of manufacturing heat transfer tube
FR2872956B1 (en) * 2004-07-12 2006-11-17 Cogema Logistics Sa EXTERNAL HEAT EXHAUST DEVICE FOR PACKAGING FOR THE STORAGE AND / OR TRANSPORT OF NUCLEAR MATERIALS
US7128139B2 (en) * 2004-10-14 2006-10-31 Nova Chemicals (International) S.A. External ribbed furnace tubes
CN104810068A (en) * 2014-01-26 2015-07-29 上海核工程研究设计院 Pressure container with fins on outer wall surface
CN112303978A (en) * 2019-07-30 2021-02-02 开利公司 Refrigeration cabinet system and control method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384154A (en) * 1956-08-30 1968-05-21 Union Carbide Corp Heat exchange system
US3600922A (en) * 1969-03-05 1971-08-24 Carrier Corp Manufacture of integrally finned tubing
DE2043459A1 (en) * 1970-09-02 1972-03-09 Battelle Institut E V Heat transfer tube - for steam condensation
DE2119345A1 (en) * 1971-04-21 1972-11-02 R. & G. Schmöle Metallwerke, 575OMenden Finned tube - fin dimensions ensure optimum heat conduction at minimum material usage
US3795125A (en) * 1972-01-27 1974-03-05 Universal Oil Prod Co High-fin integral finned tube of heat-resisting alloys, and multi-pass process for making the same
EP0102407B1 (en) * 1982-09-03 1986-02-19 Wieland-Werke Ag Finned tube with internal projections and method and apparatus for its manufacture
CA1247592A (en) * 1983-08-04 1988-12-28 James L. Cunningham Finned heat exchanger tubes and method and apparatus for making same
US4546819A (en) * 1984-02-10 1985-10-15 Amtrol Inc. Double wall heat exchanger

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DE3762920D1 (en) 1990-06-28
EP0301121A1 (en) 1989-02-01

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