US4465609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a heat pump or a thermal engine with a chloro-fluorinated hydrocarbon having an increased thermal stability
Assignee: IFP Energies nouvelles
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Filing: 1982-08-11
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Granted: 1984-08-14
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Expires: 2002-08-11
Abstract
Abstract A method of operating a heat pump or a thermal engine with the vaporization and the condensation of a heat transfer fluid. The fluid is a chlorofluorinated hydrocarbon with 2 or 3 carbon atoms, a hydrogen atom, at least one chlorine atom per molecule and at most one chlorine atom per carbon atom, with the remainder consisting of fluorine, and said fluid having a critical temperature of at least 140 DEG C.
Inventors
- 👤 Jacques Denis
- 👤 Jerome Weill
- 👤 Alexandre Rojey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:19
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
In a method of operating a heat pump or thermal engine by use of the vaporization and the condensation of a heat transfer fluid, the improvement comprising operating said heat pump or thermal engine with a heat transfer fluid consisting essentially of at least one chlorofluorinated hydrocarbon containing, in its molecule, 2 or 3 carbon atoms, only one hydrogen atom, at least one chlorine atom per molecule and at most one chlorine atom per carbon atom, and a sufficient number of fluorine atoms to saturate remaining valences, said chloro-fluorinated hydrocarbon having a critical temperature of at least 140° C., and selected from those designated as F-226, F-225 and F-224, with F-226 conforming to the formula CF 3 --CHCl--CF 3 , F-225 conforming to the formula CF 3 --CHCl--CF 2 Cl, and F-224 conforming to the formula CF 2 Cl--CHCl--CF 2 Cl.
Claim 2
Dependent Claim
141 words
In a method of operating a heat pump or thermal engine by use of the vaporization and the condensation of a heat transfer fluid, the improvement comprising operating said heat pump or thermal engine with a heat transfer fluid consisting essentially of at least one chlorofluorinated hydrocarbon containing, in its molecule, 2 or 3 carbon atoms, only one hydrogen atom, at least one chlorine atom per molecule and at most one chlorine atom per carbon atom, and a sufficient number of fluorine atoms to saturate remaining valences, said chloro-fluorinated hydrocarbon having a critical temperature of at least 140° C., and selected from those designated as F-226, F-225 and F-224, with F-226 conforming to the formula CF 3 --CHCl--CF 3 , F-225 conforming to the formula CF 3 --CHCl--CF 2 Cl, and F-224 conforming to the formula CF 2 Cl--CHCl--CF 2 Cl.
Claim 3
Dependent Claim
21 words
A method as in claim 1 wherein said chlorofluorinated hydrocarbon is F-226, conforming to the formula CF 3 --CHCl--CF 3 .
Claim 4
Dependent Claim
22 words
A method as in claim 1 wherein the condensation temperature in the heat pump or thermal engine is at least 100° C.
Claim 5
Dependent Claim
37 words
A method as in claim 1 wherein said heat pump or engine is operated in a cycle at a vaporization temperature of at least about 80° C. and a condensation temperature of at least about 120° C.
Claim 6
Dependent Claim
39 words
A method as in claim 1 wherein said chlorofluorinated hydrocarbon is sufficiently stable when used in a heat pump or thermal engine plants operated in the presence of lubricants at temperatures higher than about 80° C., to avoid decomposition.
Claim 7
Dependent Claim
22 words
A method as in claim 1 wherein said heat pump or thermal engine is operated at temperatures greater than about 80° C.
Claim 8
Dependent Claim
19 words
A method as in claim 1 wherein said heat pump or thermal engine is operated in the Rankine cycle.
References Cited (Backward Citations)
US2365516A
Cited
US4065937A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |