Plate-type heat exchangers

• US 6,082,445 A
• Filed: 02/22/1995
• Issued: 07/04/2000
• Est. Priority Date: 02/22/1995
• Status: Expired due to Term

• Current Assignee: BASF Corporation (BASF SE)
• Original Assignee: BASF Corporation (BASF SE)
• Inventors: Dugan, Jeffrey S.
• Primary Examiner(s): LEO, LEONARD R
• Application Number:
  US08/392,493
• Time in Patent Office: 1,959 Days
• Field of Search: 165/166, 165/167, 165/165
• US Class Current: 165/167
• CPC Class Codes: F28D 9/0081 the conduits for one heat-exchange medium being formed by a single plate-like element F28D9/0012 takes precedence; the conduits for one heat-exchange medium being integrated in one single plate-like element F28D9/0012 takes precedence
• CPC Class Codes: F28F 2250/102 with change of flow direction
• CPC Class Codes: F28F 3/086 having one or more openings therein forming tubular heat-exchange passages
• CPC Class Codes: Y10S 165/364 with fluid traversing passages formed through the plate

Abstract

A heat exchanger contains one or more heat exchange plates having on a common facial surface thereof a first heating fluid facial subchannel set containing at least one heating fluid facial subchannel and a first cooling fluid facial subchannel set containing at least one cooling fluid facial subchannel; wherein the heating fluid facial subchannel set and the cooling fluid facial subchannel set are mutually aligned in a heat exchange relationship on the common facial surface of the heat exchange plate(s). In one embodiment, the heat exchanger contains at least one pair of heat exchange plates, wherein a first plate in the pair has on a front facial surface thereof a first-plate heating fluid facial subchannel set and a first-plate cooling fluid facial subchannel set, and a second plate in the pair has on a front facial surface thereof a second-plate heating fluid facial subchannel set and a second-plate cooling fluid facial subchannel set, wherein the first-plate heating fluid facial subchannel set is aligned in heat exchange relationships with the first-plate cooling fluid facial subchannel set and the second-plate cooling fluid facial subchannel set, and the second-plate heating fluid facial subchannel set is aligned in heat exchange relationships with the second-plate cooling fluid facial subchannel set and the first-plate cooling fluid facial subchannel set.

Claims

1. A heat exchanger, comprising a plurality of heat exchange plates stacked in a parallel, adjacent, front-to-back facial configuration, each of said heat exchange plates having on a front facial surface thereof:

(A) a first heating fluid facial subchannel set comprising at least one heating fluid facial subchannel; and

(B) a first cooling fluid facial subchannel set comprising at least one cooling fluid facial subchannel;

wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set are mutually aligned in a first heat exchange relationship on the common facial surface,

further wherein;

(i) said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set each have a linear flow path and said first heat exchange relationship comprises a countercurrent, concurrent or crosscurrent heat exchange relationship;

(ii) said first heating fluid facial subchannel set has a linear flow path and said first cooling fluid facial subchannel set has a non-linear flow path or said first heating fluid facial subchannel set has a non-linear flow path and said first cooling fluid facial subchannel set has a linear flow path, and said first heat exchange relationship consists of a concurrent heat exchange relationship;

or

(iii) one of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a linear flow path and the other of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a non-linear flow path, wherein said non-linear flow path comprises a first longitudinal portion, a second longitudinal portion and a third non-linear end portion contiguous with said first longitudinal portion and said second longitudinal portion, wherein said linear flow path and said first longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship;

said linear flow path and said second longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship; and

said linear flow path and said third non-linear end portion are mutually aligned in a crosscurrent heat exchange relationship.

2. A heat exchanger according to claim 1, wherein the first heating fluid facial subchannel set contains a plurality of first heating fluid facial subchannels and the first cooling fluid facial subchannel set contains a plurality of first cooling fluid facial subchannels.

3. A heat exchanger according to claim 2, wherein the plurality of first heating fluid facial subchannels and the plurality of first cooling fluid facial subchannels are mutually aligned such that the plurality of first heating fluid facial subchannels and the plurality of first cooling fluid facial subchannels alternate with one another on the common facial surface.

4. A heat exchanger according to claim 1, wherein said plurality of heat exchange plates contains at least one pair of heat exchange plates, said at least one pair comprising a first heat exchange plate and a second heat exchange plate, wherein the first heat exchange plate has on a front facial surface thereof a first first-plate heating fluid facial subchannel set comprising one or more first-plate heating fluid facial subchannels and a first first-plate cooling fluid facial subchannel set comprising one or more first-plate cooling fluid facial subchannels, wherein the second heat exchange plate comprises on a front facial surface thereof a first second-plate heating fluid facial subchannel set comprising one or more second-plate heating fluid facial subchannels and a first second-plate cooling fluid facial subchannel set comprising one or more second-plate cooling fluid facial subchannels, wherein:

(a) the first first-plate heating fluid facial subchannel set and the first first-plate cooling fluid facial subchannel set are mutually aligned in a fifth heat exchange relationship;

(b) the first second-plate heating fluid facial subchannel set and the first second-plate cooling fluid facial subchannel set are mutually aligned in a sixth heat exchange relationship;

(c) the first first-plate heating fluid facial subchannel set and the first second-plate cooling fluid facial subchannel set are mutually aligned in a seventh heat exchange relationship; and

(d) the first first-plate cooling fluid facial subchannel set and the first second-plate heating fluid facial subchannel set are mutually aligned in an eighth heat exchange relationship.

5. A heat exchanger according to claim 4, wherein the fifth heat exchange relationship comprises a concurrent or countercurrent heat exchange relationship;

the sixth heat exchange relationship comprises a concurrent or countercurrent heat exchange relationship;

the seventh heat exchange relationship comprises a concurrent, countercurrent or crosscurrent heat exchange relationship; and

the eighth heat exchange relationship comprises a concurrent, countercurrent or crosscurrent heat exchange relationship.

6. A heat exchanger according to claim 4, wherein said first first-plate heating fluid facial subchannel set, said first first-plate cooling fluid facial subchannel set, said first second-plate heating fluid facial subchannel set, and said first second-plate cooling fluid facial subchannel set have been formed by an etching process.

7. A heat exchanger according to claim 1, wherein said heat exchange plates each has a thickness of greater than about 0.001 inch to about 1.0 inch.

8. A heat exchanger according to claim 7, wherein said heat exchange plates each has a thickness of from about 0.001 to about 0.25 inch.

9. A heat exchanger according to claim 8, wherein said heat exchange plates each has a thickness of about 0.010 inch.

10. A heat exchanger according to claim 1, wherein the at least one heating fluid facial subchannel and the at least one cooling fluid facial subchannel are situated on a common facial surface of a heat exchange plate having a thickness of a given value, and the at least one heating fluid facial subchannel and the at least one cooling fluid facial subchannel each have a depth of at least about 70% of said given value.

11. A heat exchanger according to claim 1, wherein the at least one heating fluid facial subchannel and the at least one cooling fluid facial subchannel each have a depth of less than or equal to about 0.25 inch.

12. A heat exchanger according to claim 11, wherein the at least one heating fluid facial subchannel and the at least one cooling fluid facial subchannel each have a depth of less than or equal to about 0.10 inch.

13. A heat exchanger according to claim 11, wherein said thermally conductive material comprises a metal.

14. A heat exchanger according to claim 13, wherein said metal is selected from the group consisting of stainless steel, aluminum, aluminum-based alloys, nickel, iron, copper, copper-based alloys, mild steel, brass, and titanium.

15. A heat exchanger according to claim 1, wherein the at least one heating fluid facial subchannel and the at least one cooling fluid facial subchannel are mutually separated by a distance of no greater than about 0.25 inch.

16. A heat exchanger according to claim 1, wherein said heat exchange plates each comprises a thermally conductive material.

17. A heat exchanger according to claim 1, wherein said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set are each micromachined structures.

18. A heat exchanger according to claim 17, wherein said micromachined structures are selected from the group consisting of etched structures, stamped structures, punched structures, pressed structures, cut structures, molded structures, milled structures, lithographed structures, and particle blasted structures.

19. A heat exchanger according to claim 18, wherein said micromachined structures are etched structures.

20. A method of exchanging heat between one or more heating fluids and one or more cooling fluids, comprising the steps of:

(1) providing a heat exchanger comprising a plurality of heat exchange plates stacked in a parallel, adjacent, front-to-back facial configuration, each of said heat exchange plates having on a front facial surface thereof;

(A) a first heating fluid facial subchannel set comprising at least one heating fluid facial subchannel; and

(B) a first cooling fluid facial subchannel set comprising at least one cooling fluid facial subchannel;

wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set are mutually aligned in a first heat exchange relationship on the common facial surface;

further wherein;

(i) said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set each have a linear flow path and said first heat exchange relationship comprises a countercurrent, concurrent or crosscurrent heat exchange relationship;

(ii) said first heating fluid facial subchannel set has a linear flow path and said first cooling fluid facial subchannel set has a non-linear flow path or said first heating fluid facial subchannel set has a non-linear flow path and said first cooling fluid facial subchannel set has a linear flow path, and said first heat exchange relationship consists of a concurrent heat exchange relationship;

or

(iii) one of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a linear flow path and the other of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a non-linear flow path, wherein said non-linear flow path comprises a first longitudinal portion, a second longitudinal portion and a third non-linear end portion contiguous with said first longitudinal portion and said second longitudinal portion, wherein said linear flow path and said first longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship;

said linear flow path and said second longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship; and

said linear flow path and said third non-linear end portion are mutually aligned in a crosscurrent heat exchange relationship; and

(2) passing the one or more heating fluids through the first heating fluid facial subchannel set, while passing the one or more cooling fluids through the first cooling fluid facial subchannel set.

21. A method according to claim 20, wherein:

(i) said said plurality of heat exchange plates comprises at least one pair of heat exchange plates, wherein said at least one pair comprises a first heat exchange plate and a second heat exchange plate, said first heat exchange plate having on a front facial surface thereof a first first-plate heating fluid facial subchannel set comprising one or more first-plate heating fluid facial subchannels and a first first-plate cooling fluid facial subchannel set comprising one or more first-plate cooling fluid facial subchannels; and

said second heat exchange plate comprises on a front facial surface thereof a first second-plate heating fluid facial subchannel set comprising one or more second-plate heating fluid facial subchannels and a first second-plate cooling fluid facial subchannel set comprising one or more second-plate cooling fluid facial subchannels;

wherein;

(a) said first first-plate heating fluid facial subchannel set and said first first-plate cooling fluid facial subchannel set are mutually aligned in a fifth heat exchange relationship;

(b) said first second-plate heating fluid facial subchannel set and said first second-plate cooling fluid facial subchannel set are mutually aligned in a sixth heat exchange relationship;

(c) said first first-plate heating fluid facial subchannel set and said first second-plate cooling fluid facial subchannel set are mutually aligned in a seventh heat exchange relationship; and

(d) said first first-plate cooling fluid facial subchannel set and said first second-plate heating fluid facial subchannel set are mutually aligned in an eighth heat exchange relationship; and

(ii) said method comprises passing said one or more heating fluids through said first first-plate heating fluid facial subchannel set and through said first second-plate heating fluid facial subchannel set while passing said one or more cooling fluids through said first first-plate cooling fluid facial subchannel set and through said first second-plate cooling fluid facial subchannel set.

22. A heat exchanger, comprising a single heat exchange plate, said heat exchange plate having on a common facial surface thereof:

(A) a first heating fluid facial subchannel set comprising at least one heating fluid facial subchannel; and

(B) a first cooling fluid facial subchannel set comprising at least one cooling fluid facial subchannel;

wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set are mutually aligned in a first heat exchange relationship on the common facial surface;

further wherein (i) said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set each have a linear flow path, (ii) said first heating fluid facial subchannel set has a non-linear flow path and said first cooling fluid facial subchannel set has a linear flow path and said first heat exchange relationship consists of a concurrent heat exchange relationship;

, (iii) said first cooling fluid facial subchannel set has a non-linear flow path and said first heating fluid facial subchannel set has a linear flow path and said first heat exchange relationship consists of a concurrent heat exchange relationship;

or (iv) one of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a linear flow path and the other of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a non-linear flow path, wherein said non-linear flow path comprises a first longitudinal portion, a second longitudinal portion and a third non-linear end portion contiguous with said first longitudinal portion and said second longitudinal portion, wherein said linear flow path and said first longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship;

said linear flow path and said second longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship; and

said linear flow path and said third non-linear end portion are mutually aligned in a crosscurrent heat exchange relationship.

23. A heat exchanger according to claim 22, wherein said heat exchange plate has a thickness of greater than about 0.001 inch to about 1.0 inch.

24. A heat exchanger according to claim 22, wherein said heat exchange plate comprises a thermally conductive material.

25. A heat exchanger according to claim 22, wherein said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set are each micromachined structures.

26. A method of exchanging heat between one or more heating fluids and one or more cooling fluids, comprising the steps of:

(1) providing a heat exchanger comprising a single heat exchange plate, said heat exchange plate having on a common facial surface thereof;

(A) a first heating fluid facial subchannel set comprising at least one heating fluid facial subchannel; and

(B) a first cooling fluid facial subchannel set comprising at least one cooling fluid facial subchannel;

wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set are mutually aligned in a first heat exchange relationship on the common facial surface;

further wherein (i) said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set each have a linear flow path, (ii) said first heating fluid facial subchannel set has a non-linear flow path and said first cooling fluid facial subchannel set has a linear flow path and said first heat exchange relationship consists of a concurrent heat exchange relationship;

(iii) said first cooling fluid facial subchannel set has a non-linear flow path and said first heating fluid facial subchannel set has a linear flow path and said first heat exchange relationship consists of a concurrent heat exchange relationship;

or (iv) one of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a linear flow path and the other of said first heating fluid facial subchannel set and said first cooling fluid facial subchannel set has a non-linear flow path, wherein said non-linear flow path comprises a first longitudinal portion. a second longitudinal portion and a third non-linear end portion contiguous with said first longitudinal portion and said second longitudinal portion, wherein said linear flow path and said first longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship;

said linear flow path and said second longitudinal portion are mutually aligned in a concurrent or countercurrent heat exchange relationship; and

said linear flow path and said third non-linear end portion are mutually aligned in a crosscurrent heat exchange relationship; and

(2) passing the one or more heating fluids through the first heating fluid facial subchannel set in a first flow direction, while passing the one or more cooling fluids through the first cooling fluid facial subchannel set in a second flow direction.

27. A method of exchanging heat between one or more heating fluids and one or more cooling fluids, comprising the steps of:

(1) providing a heat exchanger comprising a single heat exchange plate, said heat exchange plate having on a common facial surface thereof;

(A) a first heating fluid facial subchannel set comprising at least one heating fluid facial subchannel; and

(B) a first cooling fluid facial subchannel set comprising at least one cooling fluid facial subchannel;

wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set are mutually aligned in a first heat exchange relationship on the common facial surface, further wherein the first heating fluid facial subchannel set and the first cooling fluid facial subchannel set each have a linear flow path; and

(2) passing the one or more heating fluids through the first heating fluid facial subchannel set in a first flow direction, while passing the one or more cooling fluids through the first cooling fluid facial subchannel set in a second flow direction, wherein said first flow direction is countercurrent with respect to said second flow direction.