US3916638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system
Assignee: FRIEDRICH CLIMATE MASTER Inc A CORP OF DE
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Filing: 1974-06-25
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Granted: 1975-11-04
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Expires: 1994-06-25
Abstract
Abstract A water to air heat pump in which a heat exchange fluid is circulated between two heat exchangers with one normally operating as a condenser and the other normally operating as an evaporator. A third heat exchanger is provided for the purposes of heating an external water supply and, in the normal operation of the system, a switching means selectively switches the flow of heat exchange fluid from the output of the evaporator to either the condenser or the third heat exchanger. The heat pump is adapted to operate in a reverse mode in which the functions of the first two above-mentioned heat exchangers are reversed and in which the flow of fluid bypasses the third heat exchanger.
Inventors
- 👤 A Carl Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
F; F25; F25B; F25B29/00; F25B29/003; F25B13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
A heat pump comprising a first heat exchanger adapted to evaporate a heat exchange fluid and including means for passing air in a heat exchange relation to said fluid, a second heat exchanger adapted to condense said fluid and adapted for connection to an external cooling tower for circulating a liquid in a heat exchange relation to said fluid, a compressor unit connected to the outlet of said first heat exchanger, a third heat exchanger adapted to condense said fluid, first and second conduit means adapted to connect the outlet of said compressor unit to said second heat exchanger and to said third heat exchanger, respectively, first and second valve means connected in said first conduit means and said second conduit means, respectively, for selectively controlling the flow of fluid from said compressor unit to said second heat exchanger and to said third heat exchanger, third conduit means connecting the outlet of said third heat exchanger directly to said second heat exchanger, and fourth conduit means connecting the outlet of said second heat exchanger directly to said first heat exchanger.
Claim 2
Dependent Claim
180 words
A heat pump comprising a first heat exchanger adapted to evaporate a heat exchange fluid and including means for passing air in a heat exchange relation to said fluid, a second heat exchanger adapted to condense said fluid and adapted for connection to an external cooling tower for circulating a liquid in a heat exchange relation to said fluid, a compressor unit connected to the outlet of said first heat exchanger, a third heat exchanger adapted to condense said fluid, first and second conduit means adapted to connect the outlet of said compressor unit to said second heat exchanger and to said third heat exchanger, respectively, first and second valve means connected in said first conduit means and said second conduit means, respectively, for selectively controlling the flow of fluid from said compressor unit to said second heat exchanger and to said third heat exchanger, third conduit means connecting the outlet of said third heat exchanger directly to said second heat exchanger, and fourth conduit means connecting the outlet of said second heat exchanger directly to said first heat exchanger.
Claim 3
Dependent Claim
46 words
The heat pump of claim 1 further comprising reversing valve means connected to at least one of said conduit means for reversing the flow of said fluid so that said first heat exchanger acts as a condenser and said second heat exchanger acts as an evaporator.
Claim 4
Dependent Claim
45 words
The heat pump of claim 1 wherein said third heat exchanger comprises a coil, and means for connecting said coil to a domestic water supply for circulating said water in a heat exchange relation to the fluid passing through said coil to heat said water.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |