US3840067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled heat exchanger with reduced noise level
Assignee: Lummus Technology LLC
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Filing: 1973-05-02
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Granted: 1974-10-08
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Expires: 1993-05-02
Abstract
Abstract An air-cooled heat exchanger can be operated at lower noise levels by providing fans both above and below the tube bundle. Operation at lower fan speed can be achieved, with maintenance of the necessary air displacement for cooling, and reduction in overall noise level.
Inventors
- 👤 W Bos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:20
CPC Classifications
F; F28; F28B; F28B1/00; F28B1/06; F04; F04D; F04D19/00; F04D19/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A method of operation of an air-cooled heat exchanger having a plurality of substantially horizontally disposed tubes, wherein a fluid to be cooled or condensed flows through the tubes, and wherein an air current is caused to flow substantially perpendicularly to the longitudinal direction of the tubes, by a first fan means, comprising providing a second fan means on the side of the tubes remote from the first fan means in such manner that the air input of the second fan means faces the tubes, and reducing the rotational speed of the first and second fan means while maintaining substantially the same rate of flow of air over the tubes, whereby the total noise level of the fan means becomes reduced.
Claim 2
Independent Claim
121 words
A method of operation of an air-cooled heat exchanger having a plurality of substantially horizontally disposed tubes, wherein a fluid to be cooled or condensed flows through the tubes, and wherein an air current is caused to flow substantially perpendicularly to the longitudinal direction of the tubes, by a first fan means, comprising providing a second fan means on the side of the tubes remote from the first fan means in such manner that the air input of the second fan means faces the tubes, and reducing the rotational speed of the first and second fan means while maintaining substantially the same rate of flow of air over the tubes, whereby the total noise level of the fan means becomes reduced.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |