EP0114640B1 - Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften - Google Patents

Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften Download PDF

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Publication number
EP0114640B1
EP0114640B1 EP19840100427 EP84100427A EP0114640B1 EP 0114640 B1 EP0114640 B1 EP 0114640B1 EP 19840100427 EP19840100427 EP 19840100427 EP 84100427 A EP84100427 A EP 84100427A EP 0114640 B1 EP0114640 B1 EP 0114640B1
Authority
EP
European Patent Office
Prior art keywords
tube
heat exchanger
heat transfer
internal
tubes
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
EP19840100427
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English (en)
French (fr)
Other versions
EP0114640A2 (de
EP0114640A3 (en
Inventor
David L. Kienast
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.)
Wickes Products Inc
Original Assignee
Wickes Products Inc
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 Wickes Products Inc filed Critical Wickes Products Inc
Publication of EP0114640A2 publication Critical patent/EP0114640A2/de
Publication of EP0114640A3 publication Critical patent/EP0114640A3/en
Application granted granted Critical
Publication of EP0114640B1 publication Critical patent/EP0114640B1/de
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
    • F28F1/42—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
    • 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

Definitions

  • the present invention relates to a direct expansion shell and tube evaporator in mechanical systems having metal heat exchanger tubes, each comprising an integral external fin structure and an integral internal helical fin structure having a predetermined helix lead angle measured relative to the longitudinal central axis of the tube.
  • Heat exchanger elements such as metal tubes which are employed for heat transfer purposes and which may constitute components of direct expansion shell and tube evaporators for mechanical refrigeration systems, are well known in the art; particularly in configurations wherein the tubes are plain, in essence, they are unfinned and have essentially smooth bores.
  • the tubes have, in general, been provided with a plurality of integral internal fins transverse of the length of the tubes in a parallel spaced or helical pattern, thereby increasing the internal heat transfer surface area of the tubes and improving the heat transfer capabilities thereof.
  • US-A-4 305 460 and FR-A-1 275 867 are directed to tube configurations which are designed for steam condensing service, wherein water is directed through the interior of the tube and steam onto its external surface.
  • the patents teach little or nothing which would be useful to one working with direct expansion evaporators.
  • the principal concern in the design of such tubes is to provide an exterior surface which promotes drop-wise condensation and an interior surface which induces the highest degree of turbulence possible without incurring excessive pressure drop.
  • the interior heat transfer fluid is at all times liquid, its flow characteristics are well understood and easily calculated.
  • Direct expansion evaporators utilize forced convection boiling which is characterized by three complex flow regimes which are not subject to easy analysis.
  • the designer of direct expansion evaporator tube must deal with a number of counterbalancing considerations to produce a tube with superior heat transfer characteristics.
  • the metal heat exchanger tubes incorporate integral external and internal fins wherein
  • the inventive heat exchanger tube design and construction is based on actual experimental test data gathered from direct expansion coolers in refrigeration systems incorporating various correlated combinations of the external and internal finned heat exchanger surface areas, cross-sectional flow areas of the tube, and the lead angle of the internal fins, which will lead to optimized heat transfer characteristics.
  • a more specific object of the present invention resides in the provision of a metal heat exchanger tube having integral external and internal helical fins wherein the physical dimensions of the external and internal tube fins, the lead angle of the internal fins, and the cross-sectional flow area of the tube are correlated with each other to provide for optimum heat transfer capacities, particularly when the tube is to be employed in the direct expansion shell and tube evaporator of a mechanical refrigeration system.
  • a metal heat exchanger tube having a cylindrical wall construction 12 incorporates, integrally formed therewith, external fins 14 and internal fins 16.
  • the external fins 14, which are integrally formed with the cylindrical tube wall 12, may be of a generally helical configuration.
  • the internal fins which protrude into the flow passage way 18 of the heat exchanger tube 10 are also of a helical configuration.
  • the physical design criteria for the heat exchanger tube 10 takes into consideration the operating conditions of the cooler; in effect, wherein
  • the design for the heat exchanger tube is adapted for use when the heat exchanger tubes are utilized to boil and superheat the refrigerant flowing within the tubes (approximately 4° to 6°C superheat).
  • the heat exchanger tube 10 based on the foregoing operating conditions of a cooler which is employed in the direct expansion evaporators of mechanical refrigeration systems, employs dimensional parameters in the design of the heat exchanger tubes, based on each unit of tube length (L) as measured in meters. These dimensional parameters are as follows:
  • the internal heat transfer area Ai (m 2 /m) of the tube 10 which, in effect, is the total internal tube surface area for each meter of tube length L, the lead angle 0 of the internal fins, in degrees, measured relative to the longitudinal axis of the heat exchanger tube 10; and the cross-sectional flow area Aix (m 2 ) of the heat exchanger tube 10.
  • the present invention distinguishes with respect to prior art heat exchanger tube designs in that the dimensional proportions of Ao, Ai, Aix, and 0 are uniquely employed in a manner which will optimize the heat transfer capacity of the heat exchanger tube 10, which is of particular significance when employed in the direct expansion shell and tube evaporator of a mechanical refrigeration system.
  • the invention sets forth a novel geometrical interrelationship for the various dimensional parameters of a heat exchanger tube which differs from those commercially available, inventively utilizing a simplified mathematical computation and design method which is not contemplated in the prior art.

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

Claims (2)

1. Rippenrohr für Wärmetauscher in mechanischen Systemen mit Wärmetauscherrohren aus Metall, deren jedes innere Rippen und äußere, schraubenlinienformige Rippen aufweist, mit einem bestimmten Rippenwinkel in Bezug auf die zentrale Längsachse des Rohres, gekennzeichnet durch die folgenden Merkmale:
a) Das Verhältnis der inneren Wärmeübergangsfläche des Rohres pro Rohrlängeneinheit in Bezug auf die Quadratwurzel der inneren Querschnittsfläche des Rohres liegt im Bereich von etwa 4,60 bis 6,20;
b) das Verhältnis der äußeren Wärmeübergangsfläche des Rohres pro Rohr-Längeneinheit zur inneren Wärmeübergangsfläche des Rohres pro Rohr-Längeneinheit liegt im Bereich von etwa 1,5 bis 5,0;
c) der Schraubenwinkel der inneren Rippen liegt im Bereich von etwa 30 bis 60°.
2. Rippenrohr nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Wärmeübergangsfläche der inneren Rippe zur Quadratwurzel der inneren Querschnittsfläche des Rohres im Bereich von 4,25 bis 6,20 liegt, und daß der Schraubenwinkel der Innenrippen des Rohres im Beriech von etwa 40 bis 50° liegt.
EP19840100427 1983-01-25 1984-01-17 Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften Expired EP0114640B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46078483A 1983-01-25 1983-01-25
US460784 1983-01-25

Publications (3)

Publication Number Publication Date
EP0114640A2 EP0114640A2 (de) 1984-08-01
EP0114640A3 EP0114640A3 (en) 1984-08-15
EP0114640B1 true EP0114640B1 (de) 1988-03-02

Family

ID=23830070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840100427 Expired EP0114640B1 (de) 1983-01-25 1984-01-17 Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften

Country Status (2)

Country Link
EP (1) EP0114640B1 (de)
DE (1) DE3469591D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735915A1 (de) * 1987-10-23 1989-05-03 Wieland Werke Ag Waermeaustauscher
DE4141240A1 (de) * 1991-12-14 1993-06-17 Wieland Werke Ag Metallisches waermeaustauscherrohr zur kuehlung von zaehen medien
DE4401247A1 (de) * 1994-01-18 1995-07-20 Bosch Gmbh Robert Wärmeübertrager
DE4420756C1 (de) * 1994-06-15 1995-11-30 Wieland Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813040C1 (en) * 1988-04-19 1989-08-03 Wieland-Werke Ag, 7900 Ulm, De Use of a finned tube as reaction tube for exothermic chemical reactions
DE4136003A1 (de) * 1991-10-31 1993-05-06 Siemens Ag, 8000 Muenchen, De Waermetauscher, insbesondere zur rekuperativen vorwaermung der luft fuer verbrennungskraftmaschinen
US7017651B1 (en) * 2000-09-13 2006-03-28 Raytheon Company Method and apparatus for temperature gradient control in an electronic system
DE10254720A1 (de) * 2002-11-23 2004-06-03 Endress + Hauser Gmbh + Co. Kg Messgerät

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1275867A (fr) * 1960-12-09 1961-11-10 Calumet & Hecla Condenseur à vapeur
FR1386501A (fr) * 1963-12-13 1965-01-22 Tube pour chauffage et réfrigération notamment pour transformateurs
US3559437A (en) * 1967-06-26 1971-02-02 Universal Oil Prod Co Method and apparatus for making heat transfer tubing
US3826304A (en) * 1967-10-11 1974-07-30 Universal Oil Prod Co Advantageous configuration of tubing for internal boiling
US3847212A (en) * 1973-07-05 1974-11-12 Universal Oil Prod Co Heat transfer tube having multiple internal ridges
US4118944A (en) * 1977-06-29 1978-10-10 Carrier Corporation High performance heat exchanger
US4305460A (en) * 1979-02-27 1981-12-15 General Atomic Company Heat transfer tube
US4365487A (en) * 1980-02-06 1982-12-28 Luke Limited Refrigeration apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3735915A1 (de) * 1987-10-23 1989-05-03 Wieland Werke Ag Waermeaustauscher
DE4141240A1 (de) * 1991-12-14 1993-06-17 Wieland Werke Ag Metallisches waermeaustauscherrohr zur kuehlung von zaehen medien
DE4401247A1 (de) * 1994-01-18 1995-07-20 Bosch Gmbh Robert Wärmeübertrager
DE4401247C2 (de) * 1994-01-18 1998-10-08 Bosch Gmbh Robert Wärmeübertrager
DE4420756C1 (de) * 1994-06-15 1995-11-30 Wieland Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung

Also Published As

Publication number Publication date
EP0114640A2 (de) 1984-08-01
DE3469591D1 (en) 1988-04-07
EP0114640A3 (en) 1984-08-15

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