EP0114640A2 - Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften - Google Patents

Rippenrohr für Wärmetauscher mit optimierten Wärmeübertragungseigenschaften Download PDF

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Publication number
EP0114640A2
EP0114640A2 EP84100427A EP84100427A EP0114640A2 EP 0114640 A2 EP0114640 A2 EP 0114640A2 EP 84100427 A EP84100427 A EP 84100427A EP 84100427 A EP84100427 A EP 84100427A EP 0114640 A2 EP0114640 A2 EP 0114640A2
Authority
EP
European Patent Office
Prior art keywords
tube
internal
heat transfer
heat exchanger
fin
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
EP84100427A
Other languages
English (en)
French (fr)
Other versions
EP0114640B1 (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
Gulf and Western Industries 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, Gulf and Western Industries 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 metal heat exchanger tube which provides for optimized heat transfer characteristics and, more particularly, relates to an integrally finned metal heat exchanger tube which is particularly adapted for use in the direct expansion shell and tube. evaporators of mechanical refrigeration systems.
  • 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, 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.
  • finned metal heat exchanger tubes have been developed for this type of refrigeration technology wherein the addition of external integral fins has been incorporated into the physical geometries of the heat exchanger tubes for the purpose of still further enhancing the heat transfer capacities of the tubes.
  • Numerous analytical investigations and actual physical experiments have been undertaken in the industry with regard to correlating the dimensions and configurations of the heat exchanger tubes and those of the integral external and internal tube fins in order to attempt to optimize, or at least improve upon, the heat transfer characteristics of such finned heat exchanger tubes.
  • the metal heat exchanger tubes incorporate integral external and internal fins wherein the dimensional and geometrical proportions of the surface or heat transfer areas of the external and internal fins and the cross-sectional flow area of the heat exchanger tubes, in conjunction with the lead angle of the internal helical fins have been correlated in conformance with predetermined mathematical criteria in order to optimize the heat transfer capacities of the tubes, particularly when the tubes are to be employed in direct expansion evaporator of mechanical refrigeration systems.
  • 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 10 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 passageway 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 8 to 10°F 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 feet. These dimensional parameters are as follows:
  • the internal heat transfer area of the tube 10 which, in effect, is the total surface area Ai (ft/ft) of the internal fins 16 for each foot of tube length L, the lead angle 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 (ft 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 cf Ao, Ai, Aix, and 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 employee 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.

Landscapes

  • 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)
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 true EP0114640A2 (de) 1984-08-01
EP0114640A3 EP0114640A3 (en) 1984-08-15
EP0114640B1 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 (6)

* 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
EP0547363A1 (de) * 1991-12-14 1993-06-23 Wieland-Werke Ag Metallisches Wärmeaustauscherrohr zur Kühlung von zähen Medien
US5675974A (en) * 1994-01-18 1997-10-14 Robert Bosch Gmbh Heat exchanger
US7017651B1 (en) * 2000-09-13 2006-03-28 Raytheon Company Method and apparatus for temperature gradient control in an electronic system
EP2520892A1 (de) * 2002-11-23 2012-11-07 Endress + Hauser GmbH + Co. KG Messgerät

Families Citing this family (2)

* 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
DE4420756C1 (de) * 1994-06-15 1995-11-30 Wieland Werke Ag Mehrgängiges Rippenrohr und Verfahren zu dessen Herstellung

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 (6)

* 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
EP0547363A1 (de) * 1991-12-14 1993-06-23 Wieland-Werke Ag Metallisches Wärmeaustauscherrohr zur Kühlung von zähen Medien
US5675974A (en) * 1994-01-18 1997-10-14 Robert Bosch Gmbh Heat exchanger
US7017651B1 (en) * 2000-09-13 2006-03-28 Raytheon Company Method and apparatus for temperature gradient control in an electronic system
EP2520892A1 (de) * 2002-11-23 2012-11-07 Endress + Hauser GmbH + Co. KG Messgerät

Also Published As

Publication number Publication date
EP0114640B1 (de) 1988-03-02
EP0114640A3 (en) 1984-08-15
DE3469591D1 (en) 1988-04-07

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