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WO1999006780A1 - Echangeur de chaleur air-air a contre courant a plaques paralleles - Google Patents

Echangeur de chaleur air-air a contre courant a plaques paralleles Download PDF

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Publication number
WO1999006780A1
WO1999006780A1 PCT/US1998/015785 US9815785W WO9906780A1 WO 1999006780 A1 WO1999006780 A1 WO 1999006780A1 US 9815785 W US9815785 W US 9815785W WO 9906780 A1 WO9906780 A1 WO 9906780A1
Authority
WO
WIPO (PCT)
Prior art keywords
separators
heat exchanger
separator
spacing means
edge section
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.)
Ceased
Application number
PCT/US1998/015785
Other languages
English (en)
Inventor
Ronald B. Lavochkin
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.)
Aavid Thermal Products Inc
Original Assignee
Aavid Thermal 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 Aavid Thermal Products Inc filed Critical Aavid Thermal Products Inc
Publication of WO1999006780A1 publication Critical patent/WO1999006780A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F28D9/0068—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements with means for changing flow direction of one heat exchange medium, e.g. using deflecting zones
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other

Definitions

  • the present invention relates to a heat exchanger and, more particularly, to a parallel plate counter-flow air-to-air heat exchanger.
  • Air-to-air heat exchangers used in cooling units for electronics equipment typically comprise a plurality of alternating adjacent fluid channels, i.e. an ambient fluid channel and an interior fluid channel, each having a folded fin element disposed therein and separated by a separator.
  • the fin element defines a plurality of generally horizontally oriented flow channels within each of the fluid channels.
  • ambient air and interior air flow through their respective fluid and flow channels in opposite directions.
  • the folded fin element is connected to the separators and transfers thermal energy from the interior air channel to the ambient air channel .
  • Sidewall barriers are provided at opposite ends of adjacent air channels to direct the two air-flow streams into their respective adjacent fluid and flow channels where the heat energy contained in the hot interior air stream is absorbed by the folded fin element and conducted through the separator into the adjacent fin element located in the adjacent ambient air channel . The energy absorbed by the fin element in the ambient air channel is then exhausted out of the cooling unit.
  • the basic design for such counter- flow systems requires expensive material and fabrication methods.
  • secondary operations are required to bond the sidewalls to the separators to form a barrier seal between adjacent channels to ensure that the air channels are kept separate.
  • the heat transfer performance of such heat exchanges is directly related to and limited by the geometry of the flow channels as defined by the fin elements. Specifically, the channel width or vertical spacing between adjacent fin elements is limited by the fact that dust and other particulate matter may clog the flow channel if this dimension is too small.
  • the height of the fin elements (taken in a horizontal direction) is limited by the fact that the ability of the fins to conduct heat energy, i.e. fin effectiveness, is inversely proportional to the height of the fins.
  • the present invention overcomes these shortcomings of the prior art in a novel and unobvious manner.
  • the present invention is directed to a parallel-plate counter-flow air-to-air heat exchanger formed by a plurality of separators stacked in horizontally spaced apart relation and separated by spacers that define two fluid channels (an ambient air channel and an interior air channel) comprised of a plurality of generally vertically oriented flow channels through which ambient air and interior air are directed in opposite directions.
  • a fluid-tight seal is provided between adjacent flow channels to separate the ambient air and interior air flow channels. Heat energy is transferred from the interior air flow channel, through the separators and into the adjacent ambient air flow channel where it is exhausted from the cooling unit.
  • the inventive heat exchanger advantageously eliminates the folded fin element found in prior art heat exchangers and the shortcomings associated therewith and, consequently, attains increased thermal performance .
  • a heat exchanger configured according to the present invention comprises a plurality of generally vertically oriented interior air and ambient air flow channels that form two fluid channels (interior air and ambient air) and that are stacked in substantially horizontally spaced apart relation.
  • the inventive heat exchanger comprises two fluid channels, each fluid channel comprising a plurality of flow channels.
  • each flow channel is defined by a plurality of substantially planar separators held in spaced apart relation by spacers that are sealingly affixed therebetween.
  • the spacers provide a boundary for a space defined between adjacent separators and form the air flow channels .
  • a flow channel is defined by a pair of substantially planar adjacent separators held in generally horizontal spaced apart relation by spacers integrally formed thereon.
  • Each separator is longitudinally asymmetrical and includes a first lip extending in a first direction from one-half of the peripheral edge of the separator.
  • a second lip is provided on each separator that extends from the other one-half of the peripheral edge in a direction opposite to the first direction.
  • the flow channel may be formed by rotating a separator by approximately 180° and placing it in close confronting relation with another separator such that the first and second lips lie directly opposite each other.
  • the first and second lips will extend in a substantially horizontal direction away from each other. This orientation will define the ingress and egress apertures for the flow channel .
  • the first and second lips will extend in substantially horizontal directions toward each other.
  • a flow channel is defined by a pair of substantially planar separators held in spaced apart relation by spacers integrally formed thereon.
  • the longitudinal peripheral edges of each separator are offset in directions directly opposite each other -- forming a longitudinally asymmetrical separator.
  • the offset edges abbutingly contact each other on one side of the separator and extend away from each other on the opposite side of the separator.
  • the heat exchanger may be configured for mounting in an enclosure having walls which block or prevent fluid flow through some of the sides of the exchanger. Thus, less spacer material is required to define the flow channels .
  • Fig. 1 is an exploded isometric view of a heat exchanger configured according to the present invention
  • Fig. 2 is a partial end-view of the heat exchange of Fig. 1 having a plurality of separators arranged in substantially horizontally stacked relation to form a plurality of alternating adjacent ambient air and interior air flow channels;
  • Fig. 3 is a side view of an alternate embodiment of a heat exchanger of Fig. 1 ;
  • Fig. 4 is a side view of another alternate of a heat exchanger in accordance with the present invention.
  • Fig. 5 is a cross-sectional view taken along the lines 5-5 in Fig. 4 showing a plurality of separators arranged in substantially horizontally stacked relation to form a plurality of alternating adjacent ambient air and interior air flow channels;
  • Fig. 6 is a magnified view of the integral spacer and lip of the separator of the heat exchanger of Fig. 5 ;
  • Fig. 7 is a side view of still another embodiment of a heat exchanger configured according to the present invention
  • Fig. 8 is a cross-sectional view taken along the lines 8-8 in Fig. 7 showing a plurality of separators arranged in substantially horizontally stacked relation to form a plurality of alternating adjacent ambient air and interior air flow channels; and
  • Fig. 9 is a magnified view of the integral spacer and offset edge of the separator of the heat exchanger of Fig. 8.
  • FIG. 1 a parallel-plate cross-flow air-to-air heat exchanger 5 configured according to the present invention is shown in FIG. 1.
  • the inventive heat exchanger provides a plurality of adjacent flow channels through which ambient or interior air may flow in opposite directions.
  • the plural flow channels are similarly constructed and the ambient and interior air flow through the channels in opposite directions.
  • An ambient air flow channel 34 (FIG. 2) is defined by a shaped spacer 12 and a straight spacer 14 sandwiched between two substantially planar separators 10.
  • Each planar separator preferably has six sides (labelled a, b, c, d, e and f) and a longitudinal axis 3 defining a first portion X and a second portion Y.
  • the shaped spacer 12 is sized and shaped to extend longitudinally along one-half of the peripheral edge of the separator 10, e.g. along sides a, b and c bounding portion Y of the separator, and is sealingly sandwiched between adjacent separators 10 using an adhesive or other suitable sealing means so as to provide a substantially fluid-impermeable or fluid-tight seal therebetween.
  • a straight spacer 14 is sized to extend longitudinally along a portion of a peripheral edge on portion X, positioned opposite the shaped spacer 12 (e.g.
  • separators 10 are stacked in accordance with the present invention, a next layer will be formed with shaped spacer 12 positioned along sides d, e and f and straight spacer 14 positioned along side b. Thus, this layer will leave sides a and c unobstructed.
  • one air flow channel is formed by fluid entering a space defined by adjacent separators 10 and spacers in the direction of arrow 13 through side f and leaving the space in the direction of arrow 15 through side d, and another is formed by fluid entering an adjacent defined space on an adjacent layer through side c in the direction of arrow 17 and exiting the adjacent defined space through side a in the direction of arrow 19.
  • fluid flows through an opening defined by sides f of adjacent spacers, over opposing surfaces of the adjacent separators, and out through an opening defined by sides d of the adjacent spacers.
  • fluid will flow in an opposite direction, i.e. through sides c of adjacent spacers and out from sides a of adjacent spacers.
  • the plural air channels collectively form respective fluid channels, i.e. an ambient fluid channel 32 and an interior fluid channel 42, and are geometrically approximately the same size. Accordingly, the total volume of the separate fluid channels is approximately the same .
  • thermal energy is conducted through the separators 10 defining the flow channel 44 to the adjacent ambient air flow channels 34 -- without the need for additional thermally conducting structure such as, for example, fins or fin elements.
  • the transferred thermal energy may then be exhausted from the heat exchanger by suitable methods known in the art .
  • mounting points 7, 9 are positioned on opposite locations on each spacer.
  • the mounting points are dimensioned for mating with brackets or recessions
  • FIG. 3 an alternate embodiment of the heat exchanger of Fig. 1 is shown as 5' .
  • the exchanger 5' is configured for securement within an enclosure having walls 50, 52 and oriented so that wall 50 obstructs fluid flow through side e and wall 52 obstructs fluid flow through side b.
  • angled spacers 12 and straight spacers 14 are not required to seal off and define the flow channels.
  • short spacers 14' can be employed, for example, along sides a, c, d and f to define the flow channels.
  • straight spacers 14 are no longer needed, vertical displacement between adjacent separators 10 is accomplished by utilizing vertical spacers 16 which may be integrally formed with separators 10.
  • a substantially planar separator 10 includes a lip
  • lips 20 formed along sides d, e and f on portion X.
  • the oppositely located lips 20 extend in opposite directions from each other such that on one separator 10, lip 20 extends upward from a plane containing FIG. 4 and on an adjacent separator lip
  • a plurality of vertical spacers 16 may be integrally formed with the separator 10, the functionality of which will be described in more detail below.
  • an air flow channel is formed by placing two separators 10 in closely confronting relation to each other so that lips 20 from a first pair of adjacent separators 10 are brought in contact with each other to seal off sides d, e and f, and on another pair of adjacent separators lips 20 seal off sides a, b and c, as shown more clearly in FIG. 6.
  • the spacers 16 are located on opposite sides of the lips as shown in FIG. 4.
  • FIGs. 7, 8 and 9 another alternative embodiment of a heat exchanger shown as 5' according to the present invention is there depicted.
  • a lip is formed along the edges of each separator 10.
  • the lip is shown as element 22 and has a height larger than the height of lip 20 of Fig. 4.
  • Lip 22 extends upward out of the plane containing Fig. 7 along sides d, e and f, and downward out of the plane containing Fig. 7 along sides a, b and c.
  • opposing lips 22 from adjacent spacers are located in close proximity to each other to close off and provide vertical displacement to the spacer sides containing the lip (e.g.

Landscapes

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

Abstract

Un échangeur (5) de chaleur air-air à contre courant à plaques parallèles est constitué d'une pluralité de séparations (10) alignées horizontalement de manière espacée les unes par rapport aux autres et séparées par des éléments (12, 14) d'écartement qui définissent deux canaux (34, 44) pour le fluide.
PCT/US1998/015785 1997-08-01 1998-07-30 Echangeur de chaleur air-air a contre courant a plaques paralleles Ceased WO1999006780A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US5507897P 1997-08-01 1997-08-01
US60/055,078 1997-08-01
US12479598A 1998-07-29 1998-07-29
US09/124,795 1998-07-29

Publications (1)

Publication Number Publication Date
WO1999006780A1 true WO1999006780A1 (fr) 1999-02-11

Family

ID=26733822

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/015785 Ceased WO1999006780A1 (fr) 1997-08-01 1998-07-30 Echangeur de chaleur air-air a contre courant a plaques paralleles

Country Status (1)

Country Link
WO (1) WO1999006780A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072790A (en) * 1990-07-30 1991-12-17 Jones Environics Ltd. Heat exchanger core construction
US5383516A (en) * 1990-11-23 1995-01-24 Dinulescu; Mircea Heat exchanger apparatus
US5469914A (en) * 1993-06-14 1995-11-28 Tranter, Inc. All-welded plate heat exchanger

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072790A (en) * 1990-07-30 1991-12-17 Jones Environics Ltd. Heat exchanger core construction
US5383516A (en) * 1990-11-23 1995-01-24 Dinulescu; Mircea Heat exchanger apparatus
US5469914A (en) * 1993-06-14 1995-11-28 Tranter, Inc. All-welded plate heat exchanger

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