WO1992013248A1 - Heat exchangers - Google Patents

Heat exchangers Download PDF

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Publication number
WO1992013248A1
WO1992013248A1 PCT/GB1992/000115 GB9200115W WO9213248A1 WO 1992013248 A1 WO1992013248 A1 WO 1992013248A1 GB 9200115 W GB9200115 W GB 9200115W WO 9213248 A1 WO9213248 A1 WO 9213248A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
fins
end portion
flow passage
side portion
Prior art date
Application number
PCT/GB1992/000115
Other languages
French (fr)
Inventor
Martyn John Robert Todd
Original Assignee
2S Airchangers Limited
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 2S Airchangers Limited filed Critical 2S Airchangers Limited
Publication of WO1992013248A1 publication Critical patent/WO1992013248A1/en

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
    • F28D9/0031—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

  • This invention relates to heat exchangers particularly, but not necessarily, for use in domestic and/or light industrial/commercial applications.
  • the present invention is a heat exchanger having a fabrication defining two intertwined serpentine passages, each for counterflow passage of a gaseous or liquid medium, the fabrication being in the form of an upright stack with one flow passage from bottom to top of the stack and the other flow passage from top to bottom of the stack.
  • each flow passage includes an upright aligned series of horizontal portions connected together by reflexive bend portions.
  • the passages are desirably angularly disposed to each other by ninety degrees whereby the horizontal portions of each flow passage are in a multiple crossflow relationship with each other.
  • the fabrication is formed from a plurality of similar-shaped sheet members, each profiled to provide a major rectangular planar portion with a bent first end portion at one end terminating in a first flange, a first upright lateral side portion terminating in a second inward flange, a bent second end portion at the other end terminating in a third inward flange and a bent second lateral side portion terminating in a fourth inward flange, the second end portion extending in a direction opposite from that of the first end portion and first and second side portions.
  • the depth of the flow passage is desirably determined by the depth of the first side portion.
  • Each upright corner posts are preferably provided secured to a base, the sheet members fitting within the area defined by the posts with major planar portions of the sheet members parallel to each other, the posts closing off the open corners of the passages when the sheet members are erected together to form the stack.
  • Insulated side panels and a top are provided for fixing around the posts, the respective side panels having openings to align with inlets and outlets of the passages.
  • a series of fins is secured across the major planar portion in spaced relationship parallel to the first side portion.
  • the fins desirably extend in the same direction from the planar portion as does the first side portion and the fins are of lesser depth than the first side portion.
  • a second series of fins is preferably secured across the major planar portion in spaced relation parallel to each other and extending from the opposite side of the major planar portion and at right angles to the first series of fins.
  • a condensate collecting receptacle and plugged drain is beneficially provided at or adjacent to the outlet at the bottom of the stack.
  • At least one centrifugal fan having a filtered inlet housing is desirably provided for each stack to pressurise gaseous or liquid medium through one or each flow passage.
  • a heat exchanger has a fabrication 10 defining two intertwined serpentine passages 12, 14. Each passage 12/14 is for counterflow of a gaseous medium.
  • the fabrication 10 is in the form of an upright stack with one flow passage 12 from bottom to top of the stack and the other passage 14 from top to bottom of the stack.
  • the fabrication 10 for each flow passage 12/14 includes an upright aligned series of horizontal portions connected together by reflexive bend portions.
  • the passages 12, 14 are angularly disposed to each other by ninety degrees whereby the horizontal portions of each flow passage are in a multiple crossflow relationship with each other, there being twenty crossflow portions, ten for each passage 12/14 shown in Fig. 1.
  • the fabrication 10 is formed from a plurality of similar-shaped sheet members 16. Each sheet member 16 is profiled, as shown in Fig.
  • first end portion 20 at one end terminating in a first flange 22; a first upright lateral side portion 24 terminating in a second inward flange 26; a bent, preferably curved, second end portion 28 at the other end terminating in a third inward flange 30 and a bent, preferably curved, second lateral side portion 32 terminating in a fourth inward flange 34.
  • the second end portion 28 extends in a direction opposite from that of the first end portion 20 and first and second side portions 28, 32.
  • the depth of each flow passage 12, 14 is determined by the depth of the first side portion 24.
  • Each upright corner posts 36 are of box-section and are provided secured to an insulated base 38.
  • the sheet members 16 fit within the area defined by the posts 36 with their respective major planar portions 18 parallel to each other.
  • the posts 36 close off the open corners at 'A 1 and 'B' of the flow passages 12, 14 when the sheet members 16 are erected together to form the fabrication 10.
  • Suprajacent sheet members 16 are secured together at anti-clockwise right angle intervals, flange 30 of a suprajacent sheet members 16 being secured to flange 34 of the sheet member below, and flange 26 bein secured under the major planar portion of the suprajacent sheet member 16.
  • the combined depths of th second end portion and the second side portion equals the depth of the first side portion, and the combined curve of the second portion and the second side portion is concentric with the curve of the first end portion.
  • Insulated side panels 40 and a top panel 42 are provide for fixing around the posts 36. Two respective side panels 40 have openings 44 to align with inlets 46, 48 and outlets 50, 52 of the flow passages 12, 14.
  • a first series of fins 54 (shown in broken line) is secured across the major planar portion 18 in spaced relationship parallel to the first side portion 24 in each member 16.
  • the fins 54 extend in the same directio from the planar portion 18 as does the first side portion 24 and the fins 54 are of lesser depth than the first side portion 24.
  • a condensate collecting receptacle 56 i.e. a sum or tube, having a plugged drain 58 is provided at the outlet 46 at the bottom of the stack.
  • a pair of centrifugal fans 60 having a common filtered inlet housing 62 is provided for each stack to pressurise gaseous medium through one flow passage 14.
  • the joints between the sheet members 16 and between sheet members 16 and posts 36 are sealed.
  • a heat exchanger described above is interposed in an exhaust pipe system for exhausting hot air or gases to recover otherwise 'lost' heat therefrom.
  • the exhaust pipe (not shown) is connected up to the inlet 48 of passage 12 for the air or gas to flow through the sinuous flow passage 12, heat the sides and fins of the passage 12 and thereby transfer by conduction heat to the air or gas flowing through passage 14 in a counterflow direction from the fans 60.
  • the outlet 50 of the flow passage 12 is connected to the remaining part of the exhaust pipe system and the outlet 52 of the flow passage 12 is connected up for conveying the heated air or gas to the required apparatus.
  • a heat exhanger as described above is beneficial since, although operating in a counterflow manner, due to the multiple crossflow portions of the passages 12, 14 is of higher thermal efficiency than a conventional crossflow heat exchanger while having manufacturing costs similar to a crossflow heat exchanger.
  • a second series of fins 64 is secured across the major planar portion 18 in spaced relation parallel to each other and extending from the opposite side of the major planar portion 18 and at right angles to the first series of fins 54.
  • the spacing between the fins 64 of the second series is such as to alternate with the fins 54 of the first series ' when a second sheet member 16 is superimposed at a right angular disposition over a first sheet member 16.
  • the fins 54 and/or 64 are of any suitable configuration other than straight as shown in Fig. 2, for example waved, corrugated or zigzagged. Also, the sides of the fins may be dimpled or embossed.
  • the stack can comprise any required number of sheet members 16 to give the desired number of horizontal portions in the flow passages.
  • the bent portions of each sheet member are shown as curved however other suitable shapes of bent portions can be used.
  • the sheet members are beneficially of aluminium but can be of any suitable material.
  • the flow passages are made liquid tight and pumps are used in place of the centrifugal fan(s).

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  • 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

A heat exchanger has a fabrication (10) defining two intertwined serpentine passages (12, 14). Each passage (12/14) is for counterflow passage of a gaseous medium. The fabrication (10) is in the form of an upright stack with one flow passage (12) from bottom to top of the stack and the other flow passage (14) from top to bottom of the stack. The fabrication (10) for each flow passage (12/14) includes an upright aligned series of horizontal portions connected together by reflexive bend portions.

Description

HEAT EXCHANGERS
This invention relates to heat exchangers particularly, but not necessarily, for use in domestic and/or light industrial/commercial applications.
Accordingly, the present invention is a heat exchanger having a fabrication defining two intertwined serpentine passages, each for counterflow passage of a gaseous or liquid medium, the fabrication being in the form of an upright stack with one flow passage from bottom to top of the stack and the other flow passage from top to bottom of the stack.
Preferably, the fabrication for each flow passage includes an upright aligned series of horizontal portions connected together by reflexive bend portions. The passages are desirably angularly disposed to each other by ninety degrees whereby the horizontal portions of each flow passage are in a multiple crossflow relationship with each other.
Preferably also, the fabrication is formed from a plurality of similar-shaped sheet members, each profiled to provide a major rectangular planar portion with a bent first end portion at one end terminating in a first flange, a first upright lateral side portion terminating in a second inward flange, a bent second end portion at the other end terminating in a third inward flange and a bent second lateral side portion terminating in a fourth inward flange, the second end portion extending in a direction opposite from that of the first end portion and first and second side portions. The depth of the flow passage is desirably determined by the depth of the first side portion. Four upright corner posts are preferably provided secured to a base, the sheet members fitting within the area defined by the posts with major planar portions of the sheet members parallel to each other, the posts closing off the open corners of the passages when the sheet members are erected together to form the stack. Insulated side panels and a top are provided for fixing around the posts, the respective side panels having openings to align with inlets and outlets of the passages.
Preferably further, a series of fins is secured across the major planar portion in spaced relationship parallel to the first side portion. The fins desirably extend in the same direction from the planar portion as does the first side portion and the fins are of lesser depth than the first side portion. A second series of fins is preferably secured across the major planar portion in spaced relation parallel to each other and extending from the opposite side of the major planar portion and at right angles to the first series of fins. A condensate collecting receptacle and plugged drain is beneficially provided at or adjacent to the outlet at the bottom of the stack. At least one centrifugal fan having a filtered inlet housing is desirably provided for each stack to pressurise gaseous or liquid medium through one or each flow passage.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: - Fig. 1 is a perspective view of two adjacent sides and a top of a heat exchanger according to the present invention with parts cut-away for clarity; and Fig. 2 is a perspective view of a sheet member. Referring to the drawings, a heat exchanger has a fabrication 10 defining two intertwined serpentine passages 12, 14. Each passage 12/14 is for counterflow of a gaseous medium. The fabrication 10 is in the form of an upright stack with one flow passage 12 from bottom to top of the stack and the other passage 14 from top to bottom of the stack. The fabrication 10 for each flow passage 12/14 includes an upright aligned series of horizontal portions connected together by reflexive bend portions. The passages 12, 14 are angularly disposed to each other by ninety degrees whereby the horizontal portions of each flow passage are in a multiple crossflow relationship with each other, there being twenty crossflow portions, ten for each passage 12/14 shown in Fig. 1. The fabrication 10 is formed from a plurality of similar-shaped sheet members 16. Each sheet member 16 is profiled, as shown in Fig. 2, to provide a major rectangular planar portion 18 with a bent, for example curved as shown, first end portion 20 at one end terminating in a first flange 22; a first upright lateral side portion 24 terminating in a second inward flange 26; a bent, preferably curved, second end portion 28 at the other end terminating in a third inward flange 30 and a bent, preferably curved, second lateral side portion 32 terminating in a fourth inward flange 34. The second end portion 28 extends in a direction opposite from that of the first end portion 20 and first and second side portions 28, 32. The depth of each flow passage 12, 14 is determined by the depth of the first side portion 24.
Four upright corner posts 36 are of box-section and are provided secured to an insulated base 38. The sheet members 16 fit within the area defined by the posts 36 with their respective major planar portions 18 parallel to each other. The posts 36 close off the open corners at 'A1 and 'B' of the flow passages 12, 14 when the sheet members 16 are erected together to form the fabrication 10. Suprajacent sheet members 16 are secured together at anti-clockwise right angle intervals, flange 30 of a suprajacent sheet members 16 being secured to flange 34 of the sheet member below, and flange 26 bein secured under the major planar portion of the suprajacent sheet member 16. The combined depths of th second end portion and the second side portion equals the depth of the first side portion, and the combined curve of the second portion and the second side portion is concentric with the curve of the first end portion. Insulated side panels 40 and a top panel 42 are provide for fixing around the posts 36. Two respective side panels 40 have openings 44 to align with inlets 46, 48 and outlets 50, 52 of the flow passages 12, 14.
A first series of fins 54 (shown in broken line) is secured across the major planar portion 18 in spaced relationship parallel to the first side portion 24 in each member 16. The fins 54 extend in the same directio from the planar portion 18 as does the first side portion 24 and the fins 54 are of lesser depth than the first side portion 24.
A condensate collecting receptacle 56, i.e. a sum or tube, having a plugged drain 58 is provided at the outlet 46 at the bottom of the stack.
A pair of centrifugal fans 60 having a common filtered inlet housing 62 is provided for each stack to pressurise gaseous medium through one flow passage 14. The joints between the sheet members 16 and between sheet members 16 and posts 36 are sealed. In use, a heat exchanger described above is interposed in an exhaust pipe system for exhausting hot air or gases to recover otherwise 'lost' heat therefrom. The exhaust pipe (not shown) is connected up to the inlet 48 of passage 12 for the air or gas to flow through the sinuous flow passage 12, heat the sides and fins of the passage 12 and thereby transfer by conduction heat to the air or gas flowing through passage 14 in a counterflow direction from the fans 60. The outlet 50 of the flow passage 12 is connected to the remaining part of the exhaust pipe system and the outlet 52 of the flow passage 12 is connected up for conveying the heated air or gas to the required apparatus.
A heat exhanger as described above is beneficial since, although operating in a counterflow manner, due to the multiple crossflow portions of the passages 12, 14 is of higher thermal efficiency than a conventional crossflow heat exchanger while having manufacturing costs similar to a crossflow heat exchanger.
In a first modification, a second series of fins 64 is secured across the major planar portion 18 in spaced relation parallel to each other and extending from the opposite side of the major planar portion 18 and at right angles to the first series of fins 54. The spacing between the fins 64 of the second series is such as to alternate with the fins 54 of the first series' when a second sheet member 16 is superimposed at a right angular disposition over a first sheet member 16.
In a second modification, the fins 54 and/or 64 are of any suitable configuration other than straight as shown in Fig. 2, for example waved, corrugated or zigzagged. Also, the sides of the fins may be dimpled or embossed.
The stack can comprise any required number of sheet members 16 to give the desired number of horizontal portions in the flow passages. The bent portions of each sheet member are shown as curved however other suitable shapes of bent portions can be used.
The sheet members are beneficially of aluminium but can be of any suitable material. When the heat exchanger is to be used with liquid medium, the flow passages are made liquid tight and pumps are used in place of the centrifugal fan(s).
Variations and other modifications can be made without departing from the scope of the invention described above.

Claims

CLAIMS :
1. A heat exchanger having a fabrication defining two intertwined serpentine passages, each for counterflow passage of a gaseous or liquid medium, the fabrication being in the form of an upright stack with one flow passage from bottom to top of the stack and the other flow passage from top to bottom of the stack.
2. Heat exchanger as claimed in Claim 1 , wherein the fabrication for each flow passage includes an upright aligned series of horizontal portions connected together by reflexive bend portions.
3. Heat exchanger as claimed in Claim 1 or 2, wherein the passages are angularly disposed to each other by ninety degrees whereby the horizontal portions of each flow passage are in a multiple crossflow relationship with each other.
4. Heat exchanger as claimed in Claims 1 , 2 or 3, wherein the fabrication is formed from a plurality of similar-shaped sheet members.
5. Heat exchanger as claimed in Claim 4, wherein each sheet member is profiled to provide a major rectangular planar portion with a bent first end portion at one end terminating in a first flange, a first upright lateral side portion terminating in a second inward flange, a bent second end portion at the other end terminating in a third inward flange and a bent second lateral side portion terminating in a fourth inward flange, the second end portion extending in a direction opposite from that of the first end portion and first and second side portions.
6. Heat exhanger as claimed in Claim 5, wherein the first end portion, the second end portion and the second lateral side portion are curved.
7. Heat exchanger as claimed in Claim 5 or 6, wherein the depth of the flow passage is determined by the depth of the first side portion.
8. Heat exchanger as claimed in Claim 7, wherein the combined depths of the second end portion and the second side portion equals the depth of the first side portion.
9. Heat exchanger as claimed in Claim 8, wherein the combined curve of the second end portion and the second side portion is concentric with the curve of the first end portion.
10. Heat exchanger as claimed in any one of Claims 5 to 9 , wherein four upright corner posts are provided secured to a base, the sheet members fitting within the area defined by the posts with the major planar portions of the sheet members parallel to each other, the posts closing off the open corners of the passages when the sheet members are erected together to form the stack.
11. Heat exchanger as claimed in Claim 10 , wherein insulated side panels and a top are provided for fixing around the posts, the respective side panels having openings to align with inlets and outlets of the flow passages.
12. Heat exchanger as claimed in any one of Claims 5 to 11 , wherein a first series of fins is secured across the major planar portion in spaced relationship parallel to the first side portion.
13. Heat exchanger as claimed in Claim 12, wherein the fins of the first series extend in the same direction from the planar portion as does the first side portion and the fins are of lesser depth than that of the first side portion.
14. Heat exchanger as claimed in Claim 13, wherein a second series of fins is secured across the major planar portion in spaced relation parallel to each other and extending from the opposite side of the major planar portion and at right angles to the first series of fins.
15. Heat exchanger as claimed in Claim 14, wherein the spacings between the fins of the second series is such as to alternate with the fins of the first series when a second sheet member is superimposed at a right angular disposition over a first sheet member.
16. Heat exchanger as claimed in any one of the preceding Claims, wherein a condensate collecting receptacle and plugged drain is provided at or adjacent to the outlet at the bottom of the stack.
17. Heat exchanger as claimed in any one of the preceding Claims, wherein at least one centrifugal fan having a filtered inlet housing is provided for each fabrication to pressurise gaseous medium through one or each flow passage.
18. Heat exchanger substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1992/000115 1991-01-18 1992-01-20 Heat exchangers WO1992013248A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919101112A GB9101112D0 (en) 1991-01-18 1991-01-18 Modular heat exchanger
GB9101112.2 1991-01-18

Publications (1)

Publication Number Publication Date
WO1992013248A1 true WO1992013248A1 (en) 1992-08-06

Family

ID=10688646

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/000115 WO1992013248A1 (en) 1991-01-18 1992-01-20 Heat exchangers

Country Status (6)

Country Link
EP (1) EP0567526A1 (en)
AU (1) AU1172692A (en)
CA (1) CA2100267A1 (en)
GB (2) GB9101112D0 (en)
IE (1) IE77164B1 (en)
WO (1) WO1992013248A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79044C (en) * — o. wehrle, Emmendingen, Baden, u. E. fehr, Riegel Heat exchange device for liquids with intersecting motion
FR2216539A1 (en) * 1973-02-02 1974-08-30 Chaffoteaux Et Maury
FR2311267A1 (en) * 1975-05-14 1976-12-10 Interliz Anstalt Cross flow plate heat exchanger - has frame housing with two rectangular cover plates and four hollow connecting struts of triangular cross section
FR2314461A1 (en) * 1976-05-07 1977-01-07 Dieu Andre Composite-type heat exchanger - comprises identical plates with chambes formed between adjacent ones constituting two circuits
DE3105387A1 (en) * 1981-02-14 1982-08-26 Wolfgang Dipl.-Ing. Heuer Device for recovering heat from polluted, uncleaned bodies of water
EP0074740A2 (en) * 1981-09-11 1983-03-23 Melanesia International Trust Company Limited Heat exchanger
EP0108377A1 (en) * 1982-11-04 1984-05-16 Matsushita Electric Industrial Co., Ltd. Heat exchanger
DE3320167A1 (en) * 1983-06-03 1984-12-06 Gea Ahlborn Gmbh & Co Kg, 3203 Sarstedt Heat exchanger
DE8220601U1 (en) * 1982-07-19 1987-12-10 Weigelt, Arno-Wolfgang, Ing.(Grad.), 7250 Leonberg Heat exchanger

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79044C (en) * — o. wehrle, Emmendingen, Baden, u. E. fehr, Riegel Heat exchange device for liquids with intersecting motion
FR2216539A1 (en) * 1973-02-02 1974-08-30 Chaffoteaux Et Maury
FR2311267A1 (en) * 1975-05-14 1976-12-10 Interliz Anstalt Cross flow plate heat exchanger - has frame housing with two rectangular cover plates and four hollow connecting struts of triangular cross section
FR2314461A1 (en) * 1976-05-07 1977-01-07 Dieu Andre Composite-type heat exchanger - comprises identical plates with chambes formed between adjacent ones constituting two circuits
DE3105387A1 (en) * 1981-02-14 1982-08-26 Wolfgang Dipl.-Ing. Heuer Device for recovering heat from polluted, uncleaned bodies of water
EP0074740A2 (en) * 1981-09-11 1983-03-23 Melanesia International Trust Company Limited Heat exchanger
DE8220601U1 (en) * 1982-07-19 1987-12-10 Weigelt, Arno-Wolfgang, Ing.(Grad.), 7250 Leonberg Heat exchanger
EP0108377A1 (en) * 1982-11-04 1984-05-16 Matsushita Electric Industrial Co., Ltd. Heat exchanger
DE3320167A1 (en) * 1983-06-03 1984-12-06 Gea Ahlborn Gmbh & Co Kg, 3203 Sarstedt Heat exchanger

Also Published As

Publication number Publication date
GB9313713D0 (en) 1993-10-20
IE920154A1 (en) 1992-07-29
AU1172692A (en) 1992-08-27
GB2269229B (en) 1994-08-24
EP0567526A1 (en) 1993-11-03
GB9101112D0 (en) 1991-02-27
CA2100267A1 (en) 1992-07-19
IE77164B1 (en) 1997-12-03
GB2269229A (en) 1994-02-02

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