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US4074753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer in pool boiling
Assignee: York International Corp
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Filing: 1976-07-23
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Granted: 1978-02-21
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Expires: 1996-07-23
Abstract
Abstract A heat transfer surface for use in a flooded evaporator. In a preferred embodiment, a fibrous material is wrapped on the surface of a tubular heat exchange member so that the strands of material lie in spaced relation so as not to blanket the entire surface but rather to provide a good distribution of nucleation sites over the tube surface.
Inventors
- 👤 Karl V. Schmittle
- 👤 Keith E. Starner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:35
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F13/187
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
In a heat exchanger adapted for use in a pool boiling application wherein a relatively low boiling point liquid is caused to boil on the outside surface of a plurality of heat exchange tubes totally immersed in said liquid, each said tube comprising an elongated, tubular metal substrate and a length of fibrous, multifilament funicular material spirally wound on the outside surface of said substrate, the spacing between adjacent turns being approximately 0.01 inch, said funicular material having an outer diameter between 0.01 and 0.02 inches.
Claim 2
Dependent Claim
86 words
In a heat exchanger adapted for use in a pool boiling application wherein a relatively low boiling point liquid is caused to boil on the outside surface of a plurality of heat exchange tubes totally immersed in said liquid, each said tube comprising an elongated, tubular metal substrate and a length of fibrous, multifilament funicular material spirally wound on the outside surface of said substrate, the spacing between adjacent turns being approximately 0.01 inch, said funicular material having an outer diameter between 0.01 and 0.02 inches.
Claim 3
Dependent Claim
23 words
The combination as defined in claim 1 wherein said fibrous material is selected from the group consisting of nylon, polyester, rayon and cotton.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |