US3757855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary surface heat exchanger
Assignee: Union Carbide Corp
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Filing: 1971-10-15
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Granted: 1973-09-11
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Expires: 1991-10-15
Abstract
Abstract An all purpose primary-surface heat exchanger, comprising an array of parallel channels formed and bounded by thin heat conductive walls, at least one wall of which has on at least a portion of its surface substantially uniformly disposed unidirectional truncated conical wall-supporting projections formed from the wall. The projections are arranged so as to mate with and to abut supportingly against corresponding wallsupporting projections of a similar adjacent wall. The walls, so arranged, are sealed at the wall edges in a manner to form and isolate alternate enclosed channels from intervening open channels so that the alternate channels may contain and conduct a first fluid, and the intervening channels may contain and conduct a second fluid at a different temperature, thereby effecting heat exchange between the fluids.
Inventors
- 👤 L Kun
- 👤 J Wulf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:01
CPC Classifications
F; F28; F28F; F28F3/00; F28F3/02; F28F3/04; F28F3/042; F28F3/044; F28D; F28D1/00; F28D1/02; F28D1/03; F28D1/0391; F28F9/00; F28F9/02; F28D21/00; F28D2021/0019; F28D2021/008; F28D2021/0091; F28D2021/0094; F28F1/00; F28F1/02; F28F2001/027; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/356; Y10S165/373; Y10S165/374; Y10S165/376; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
327 words
A primary surface heat exchanger comprising at least one channel element bound by two thermally conductive walls being spaced by edge portions, said channel element having an entrance opening at one end, an exit opening at the opposite end and on at least a portion of each wall surface substantially uniformly disposed only outwardly extending truncated conical wallsupporting projections formed from the wall, said projections having load bearing segments at their extremities which are shaped for mating with and abutting against similar type load bearing segments on wall-supporting only outwardly extending projections of a second channel element; said wall-supporting outwardly extending truncated conical projections having a dimensional size and a dimensional relationship therebetween defined by a H/D ratio of between about 0.05 and about 0.2; a D/d ratio of between about 3 and about 10, a D dimension of between about 0.2 and 2.5 inches and a wall thickness between about 0.003 and about 0.25 inch; a R/D ratio greater than about 0.075; and a cone angle theta less than 35*; wherein H equals the maximum height measured perpendicularly from a surface which contains the extremities of the wall-supporting outwardly extending projections to the plane containing the undeformed surface of the wall adjacent the projection; D equals the spacing between the centers of the closest adjacent wall-supporting outwardly extending projections on the surface of the wall; d equals the equivalent diameter defined by the ratio 4a/p whereby a equals the area of the load bearing Segment of the wall-supporting outwardly extending projection and p equals the perimeter of said load bearing segment; theta equals the acute angle measured between the horizontal undeformed surface of the wall adjacent the outwardly extending projection and the substantially straight segment along the sloped side of the projection; and R equals the radius of curvature of the surface segments on both sides of the bounding line of intersection formed by the projection and the undeformed surface of the wall adjacent the projection.
Claim 2
Dependent Claim
327 words
A primary surface heat exchanger comprising at least one channel element bound by two thermally conductive walls being spaced by edge portions, said channel element having an entrance opening at one end, an exit opening at the opposite end and on at least a portion of each wall surface substantially uniformly disposed only outwardly extending truncated conical wallsupporting projections formed from the wall, said projections having load bearing segments at their extremities which are shaped for mating with and abutting against similar type load bearing segments on wall-supporting only outwardly extending projections of a second channel element; said wall-supporting outwardly extending truncated conical projections having a dimensional size and a dimensional relationship therebetween defined by a H/D ratio of between about 0.05 and about 0.2; a D/d ratio of between about 3 and about 10, a D dimension of between about 0.2 and 2.5 inches and a wall thickness between about 0.003 and about 0.25 inch; a R/D ratio greater than about 0.075; and a cone angle theta less than 35*; wherein H equals the maximum height measured perpendicularly from a surface which contains the extremities of the wall-supporting outwardly extending projections to the plane containing the undeformed surface of the wall adjacent the projection; D equals the spacing between the centers of the closest adjacent wall-supporting outwardly extending projections on the surface of the wall; d equals the equivalent diameter defined by the ratio 4a/p whereby a equals the area of the load bearing Segment of the wall-supporting outwardly extending projection and p equals the perimeter of said load bearing segment; theta equals the acute angle measured between the horizontal undeformed surface of the wall adjacent the outwardly extending projection and the substantially straight segment along the sloped side of the projection; and R equals the radius of curvature of the surface segments on both sides of the bounding line of intersection formed by the projection and the undeformed surface of the wall adjacent the projection.
Claim 3
Dependent Claim
36 words
The heat exchanger of claim 1 wherein said thermally conductive heat exchange element is made from at least one material selected from the group consisting of metals, metal alloys, metal clads, plastics and plastic coated metals.
Claim 4
Dependent Claim
128 words
The heat exchanger of claim 2 for use in conjunction with internal combustion engines wherein said H/D ratio is between about 0.05 and about 0.12; wherein said D/d ratio is between about 3 and about 7; wherein said D dimension is between about 0.2 and about 0.6 inch; wherein said angle theta is less than about 35*; wherein said R/D ratio is greater than about 0.075; wherein said wall thickness is between about 0.003 and about 0.02 inch; wherein at least two of said elements are juxtaposed with the mating load bearing segments on the wall-supporting projections of said elements in touching relationship to form a first set of passages defined by said channel elements and a second set of passages defined by, and between, adjacent channel elements.
Claim 5
Dependent Claim
43 words
The heat exchanger of claim 3 wherein the heat exchange element is made of aluminum having a wall thickness of about 0.008 inch; said H/D ratio is about 0.08; said D/d ratio is about 4.8 and said D dimension is about 0.4 inch.
Claim 6
Dependent Claim
18 words
The heat exchanger of claim 2 wherein secondary surface heat dissipating fins are added to said channel element.
Claim 7
Dependent Claim
18 words
The heat exchanger of claim 3 wherein secondary surface heat dissipating fins are added to said channel elements.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |