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Publication numberUS3170512 A
Publication typeGrant
Publication dateFeb 23, 1965
Filing dateMar 29, 1963
Priority dateMar 29, 1963
Publication numberUS 3170512 A, US 3170512A, US-A-3170512, US3170512 A, US3170512A
InventorsJohn F D Smith
Original AssigneeCarrier Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Heat exchanger
US 3170512 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Feb. 23, 1965 J. F. D. SMITH HEAT EXCHANGER Filed March 29, 1963 FIG. 4




United States Patent 3,170,512 HEAT EXCHANGER John F. D. Smith, Fayetteville, N.Y., assignor to Carrier Corporation, Syracuse, N.Y., a corporation of Delaware Filed Mar. 29, 1963, Ser. No. 268,945 3 Claims. (Cl. 165110) This invention relates generally to heat exchange apparatus. More particularly, this invention pertains to improved heat exchange tubes for use in condensers.

Typical construction of condensers herein under consideration, comprises an enclosed shell having a plurality of heat exchange tubes disposed therein forming interior passageways. The shell is provided with suitable connections for passing two fluid mediums in heat exchange relationship with each other such that heat is transferred from one of the mediums to the other. The heat exchange tubes conduct a first fluid medium through their interior and provide a surface over which a second fluid medium in the gaseous state may flow. The temperature difference between these two fluid mediums is such that the second fluid medium will condense by dissipating its heat of condensation to the first fluid medium.

A substantial quantity of heat may be rejected in this manner; however, the heat transfer capacity of a given size condenser is limited to a great extent by the temperature difference between the two fluid mediums and is also highly dependent upon the contact surface available for heat transfer.

It is an object of this invention to improve the heat transfer performance of condensers for use in refrigeration systems and the like.

Another object of this invention is to provide a heat exchange tube having a porous heat transfer surface and an arrangement for drainage of condensate.

These and other objects of this invention are achieved in the illustrated embodiments by providing a condenser having a plurality of horizontal heat exchange tubes disposed Within its outer shell. These tubes are each comprised of an impervious metal pipe substantially covered by a porous metal jacket to define an elongated opening along the bottom of the jacket. Portions of the pipe and jacket are in spaced relation forming a plurality of annular passageways in communication with the opening in the bottom so that condensate formed in the porous jacket may flow into the passageways and drain out the opening into a drain trough.

The porous jacket is formed of a compacted metal powder that provides a very large surface area in relation to its volume available for heat transfer and may be any metal possessing good thermal conducting characteristics, for example, electrolytically produced dendritic copper powder. The term porous as used herein is defined as the characteristic of a body having a large number of minute internal cavities of capillary size which form surface interstices in communication with a number of the internal cavities to provide minute passageways whereby a fluid medium may pass through the body.

The various features and advantages of this invention will become apparent from the following description when considered in connection with the drawings wherein:

FIGURE 1 is a diagrammatic sectional view of a condenser having heat exchange tubes in accordance with this invention;

FIGURE 2 is an end view of a heat exchange tube as contemplated by this invention;

FIGURE 3 is a sectional view of the heat exchange tube shown in FIGURE 2;

FIGURE 4 is a sectional view of the heat exchange tube in a modified form as contemplated by this invention.

3,170,512 Patented Feb. 23, 1965 Referring more particularly to the drawings, FIG- URE 1 shows a condenser 11 having an outer shell 13 with a plurality of heat exchange tubes 15 horizontally disposed therein and supported by the tube sheets 16. Condenser 11 is provided with connections 17 and 19 for conduction of a first fluid medium which passes through the interior of the heat exchange tubes 15. A second condensable medium enters the condenser 11 at connection 21 located in the upper portion of the shell 13 and the formed condensate leaves the bottom of the shell 13 from a drain connection 23.

The construction of heat exchange tubes 15 in accordance with this invention is shown by FIGURES 1 and 2. An impervious metal pipe 25 has formed therein a plurality of annular indentations 27 spaced along the longitudinal axis of pipe 25. A porous metal jacket 29 substantially covers the impervious metal pipe 25 and defines an elongated opening 31 (FIGURE 2) extending along the bottom of the jacket 29. Fixed within the opening is a trough 32 as disclosed in US. Patent No. 2,983,115 and is incorporated herein by reference. The porous metal jacket 29 and annular indentations 27 combine to form therebetween the walls of internal annular passageways 33 which communicates with the opening 31 at the bottom of jacket 29. The impervious pipe 25 and porous jacket 29 may be mechanically bonded totogether by any suitable method such as brazing to form a good thermal bond therebetween.

The porous metal jacket 29 employed by this invention is generally a preformed body formed of a compacted metal powder, for example, electrolytically produced dendritic copper powder. The process used to compact the metal powder may be any number of techniques in the powder metallurgical art providing the resulting compact remains porous as heretofore defined. It is desirable that the compact be sintered to provide rigidity, however, the operation must be such that the internal cavities are not sealed off from communication with each other.

In FIGURE 4, there is shown a modification of the heat exchange tube 15 as contemplated by this invention. In this construction the impervious metal pipe 25 is provided with a plurality of extended fins 35 thereon and is the type frequently employed in heat exchangers. The same porous metal jacket 29, heretofore described, substantially covers the extended fins 35 and may also be mechanically bonded thereto. A plurality of internal annular passageways 33 which communicate with the opening 31 (FIGURE 2) are again formed between the impervious pipe 25 and porous jacket 29 defined by the extended fins 35. The trough 32 is included in this construction.

The operation is such that the first fluid medium passing through the interior of the heat exchange tubes 15 removes heat from a condensable medium delivered into the condenser shell 13 through connection 21. The condensable medium enters the many internal cavities of the porous jacket 29 wherein it gives up its heat of condensation and condenses. The condensate continues on through the porous jacket 29 into the internal passageways 33 wherein it is conducted to the elongated opening 31 for drainage into the trough 32. A secondary tube sheet 34 is provided at one end adjacent one of the tube sheets 16 and interconnects the trough 32 of each tube to the connection 23 for drainage from condenser 11.

In addition to the high heat transfer performance obtained by this invention, other advantages are provided over prior art condensers. For example, it is possible to reduce the size and obtain the same capacity due to the large heat transfer area provided by the porous metal jacket without a proportional increase in volume.

Various other advantages and applications will occur 3 to those skilled in the art and it is understood that this invention is not limited to the described embodiments but may be otherwise practiced within the scope of the following appended claims:

I claim:

1. A condenser comprising an elongated, heat conducting, impervious, metal, heat exchange tube, the enterior surface of said heat exchange tube having a shape defining a plurality of substantially circumferentially extending, substantially annular, grooves; a porous heat conducting, metal jacket being secured in heat exchange relation with substantially the entire exterior surface of said heat exchange tube and defining with said annular grooves a plurality of condensate passages; said porous metal jacket having formed therein an opening extending below and in communication with each said annular passage of said heat exchange tube, said opening defining a passage for the removal of condensate from said plurality of condensate passages.

2. A condenser as defined in claim 1 further including a relatively impervious, channel shaped, trough member, secured to said porous jacket and extending below said opening formed in said porous metal jacket, said trough being adapted to pass condensate from said plurality of condensate passages to a desired location.

3. A condenser of a type adapted to condense re-,

frigerant vapor for use in a refrigeration system comprising a condenser shell having a passage for admitting refrigerant vapor into said shell and a passage for withdrawing refrigerant condensate therefrom; a plurality of hollow impervious, metal heat exchange tubes disposed substantially horizontally within said shell, each said heat exchange tubes having an exterior surface having a shape defining a plurality of substantially circumferentially extending, substantially annular, grooves; a porous heat conducting metal jacket being secured in heat ex 1 impervious channel shaped trough member secured to said porous jacket and extending below said opening formed in said porous metal jacket, said trough being adapted to pass condensate from said plurality of condensate passages; a pair of tube sheets supporting said heat exchange tubes within said shell and defining with said shell a passage for the admission and withdrawal of a cooling heat exchange fluid for passage through the interior of said heat exchange tubes; a third tube sheet disposed adjacent and in spaced relation with one of said 1 pair of tube sheets, said third tube sheet defining with said one tube sheet a chamber for the collection and withdrawal of condensate, said channel shaped trough member extending through said third tube sheet and being open to said chamber formed between said third tube sheet and said one tube sheet so as to discharge condensatedrained from said condensate passages, along said trough, into said chamber.

References Cited by the Examiner UNITED STATES PATENTS 2,361,854 10/44 McCormack 62505 2,941,759 6/60 Rice et al 133 2,983,115 5/61 Caswell 165110 X CHARLES SUKALO, Primary Examiner.


Patent Citations
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3315736 *Sep 17, 1964Apr 25, 1967Continental Oil CoCondenser in sample fractionating system
US3394756 *May 1, 1967Jul 30, 1968United Aircraft CorpPorous plate condenser
US3428126 *Feb 15, 1967Feb 18, 1969Olin MathiesonHeating unit
US3565166 *Jun 28, 1968Feb 23, 1971United Aircraft CorpPorous plate condenser-separator
US3797559 *Jul 31, 1969Mar 19, 1974Union Carbide CorpRotary heat exchanger and apparatus
US3905203 *Jun 24, 1974Sep 16, 1975Carlyle W JacobRefrigeration and water condensate removal apparatus
US4064914 *Nov 23, 1976Dec 27, 1977Union Carbide CorporationPorous metallic layer and formation
US4108241 *Mar 19, 1975Aug 22, 1978The United States Of America As Represented By The Administrator Of The National Aeronautics And Space AdministrationHeat exchanger and method of making
US4150551 *Dec 20, 1977Apr 24, 1979Paul EislerCooling apparatus
US4355636 *Jun 20, 1980Oct 26, 1982Dragerwerk AgHumdifier and heater for air to be inhaled for connection to an inhalation conduit of a respirator
US4359086 *May 18, 1981Nov 16, 1982The Trane CompanyHeat exchange surface with porous coating and subsurface cavities
US4453496 *Jul 30, 1982Jun 12, 1984Miura Co., Ltd.Multitubular once-through boiler
US4495988 *Apr 9, 1982Jan 29, 1985The Charles Stark Draper Laboratory, Inc.Controlled heat exchanger system
US4548262 *Sep 25, 1984Oct 22, 1985Hull Francis RCondensing gas-to-gas heat exchanger
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US7926793Apr 25, 2009Apr 19, 2011Battelle Memorial InstituteMixing in wicking structures and the use of enhanced mixing within wicks in microchannel devices
US8438873 *Apr 1, 2009May 14, 2013Battelle Memorial InstituteMethods for separating a fluid, and devices capable of separating a fluid
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DE3101574A1 *Jan 20, 1981Feb 18, 1982Cummins Engine Co IncFilter- und kuehleinrichtung fuer den schmiermittelkreislauf von brennkraftmaschinen sowie oelfilter und adapter zur anbringung eines solchen oelfilters am motorblock
EP1662213A1 *Sep 16, 2005May 31, 2006Daewoo Electronics CorporationCooling system with economiser circuit
WO1985001571A1 *Sep 19, 1984Apr 11, 1985Vapor CorpShell and tube heat transfer apparatus and process therefor
U.S. Classification165/110, 165/907, 165/180, 165/913, 165/DIG.199
International ClassificationF25B39/04, F28D7/16, F28F1/12
Cooperative ClassificationY10S165/907, F28D7/16, Y10S165/913, F28F1/12, F25B39/04, Y10S165/199
European ClassificationF25B39/04, F28D7/16, F28F1/12