Patent US3845628A successfully refreshed from Google Patents.
US3845628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat transfer apparatus
Assignee: ORMOT TURBINES 1965 Ltd
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Filing: 1973-08-29
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Granted: 1974-11-05
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Expires: 1993-08-29
Abstract
Abstract Heat transfer apparatus comprising a pair of heat exchangers connected in a closed system containing a heat transfer fluid made up of a mixture of at least two fluids having different boiling points, the starting fluid, i.e., the fluid with the lower boiling point having a freezing point lower than the freezing point of the operating fluid, i.e., the fluid with the higher boiling point; the application of heat to the first of the heat exchangers converting liquid fluid therein to vapor which flows into the second heat exchanger from which heat is extracted for converting the vapor therein to a liquid at a temperature and pressure lower than in the first heat exchanger; means to feed liquid from the second heat exchanger into the first heat exchanger; and means for trapping liquid starting fluid as it is produced by the second heat exchanger during the initial application of heat to the first heat exchanger and for preventing the return of the trapped liquid starting fluid to the first heat exchanger as long as sufficient heat is applied thereto whereby the operating fluid circulates around the system after the starting fluid is trapped.
Inventors
- 👤 L Bronicki
- 👤 A Yogev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:47
CPC Classifications
F; F01; F01K; F01K25/00; F01K25/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
Heat transfer apparatus comprising: a. a pair of heat exchangers connected in a closed system; b. a heat transfer fluid contained within the system and made up of a mixture of at least two fluids termed the starting and the operating fluids, the starting fluid having a lower boiling point than the operating fluid, and a freezing point lower than the freezing point of the operating fluid whereby the application of heat to the first of the heat exchangers converts liquid fluid therein to vapor which flows into the second heat exchanger from which heat is extracted for converting the vapor therein to a liquid at a temperature and pressure lower than in the first heat exchanger; c. means to feed liquid from the second heat exchanger into the first heat exchanger; and d. means for trapping liquid starting fluid as it is produced by the second heat exchanger during the initial application of heat to the first heat exchanger and for preventing the return of the trapped liquid starting fluid to the first heat exchanger as long as sufficient heat is applied thereto whereby the operating fluid circulates around the system after the starting fluid is trapped.
Claim 2
Dependent Claim
198 words
Heat transfer apparatus comprising: a. a pair of heat exchangers connected in a closed system; b. a heat transfer fluid contained within the system and made up of a mixture of at least two fluids termed the starting and the operating fluids, the starting fluid having a lower boiling point than the operating fluid, and a freezing point lower than the freezing point of the operating fluid whereby the application of heat to the first of the heat exchangers converts liquid fluid therein to vapor which flows into the second heat exchanger from which heat is extracted for converting the vapor therein to a liquid at a temperature and pressure lower than in the first heat exchanger; c. means to feed liquid from the second heat exchanger into the first heat exchanger; and d. means for trapping liquid starting fluid as it is produced by the second heat exchanger during the initial application of heat to the first heat exchanger and for preventing the return of the trapped liquid starting fluid to the first heat exchanger as long as sufficient heat is applied thereto whereby the operating fluid circulates around the system after the starting fluid is trapped.
Claim 3
Dependent Claim
78 words
Heat transfer apparatus according to claim 1, wherein the means for trapping the liquid starting fluid includes a tank connected to the second heat exchanger, and a check valve in the liquid line connecting the tank to the first heat exchanger for preventing pressurized liquid therein from flowing into the tank and for effecting the gravity flow of liquid in the tank into the first heat exchanger in response to the termination of the application of heat thereto.
Claim 4
Dependent Claim
57 words
Heat transfer apparatus according to claim 2, wherein the check valve is positioned below the tank and remains closed until the tank fills with liquid starting fluid after which the hydrostatic head on the check valve causes the valve to open and effect the passage of liquid from the second heat exchanger into the first heat exchanger.
Claim 5
Dependent Claim
30 words
Heat transfer apparatus according to claim 2 wherein a shut-off valve is interposed between the tank and the check valve for selectively disconnecting the tank from the first heat exchanger.
Claim 6
Dependent Claim
70 words
Heat transfer apparatus accordIng to claim 1 wherein the heat transfer apparatus is a closed Rankine cycle power plant, the first heat exchanger is a boiler, and the second heat exchanger includes a turbine for expanding the boiler vapor and driving a load such as an electrical generator, and a condenser for converting the turbine exhaust vapor to a liquid at a temperature and pressure lower than in the boiler.
Claim 7
Dependent Claim
34 words
Heat transfer apparatus according to claim 5, wherein the starting fluid is a lower aliphatic monohydric alcohol of up to three carbon atoms, and is preferably methyl alcohol, and the operating fluid is ODB.
Claim 8
Dependent Claim
54 words
Heat transfer apparatus according to claim 2, wherein a connection exists between the vapour side of the tank and the vapour side of the second heat exchanger for feeding vapourized starting fluid back into the second heat exchanger when the vapour pressure in the tank exceeds the vapour pressire in the second heat exchanger.
Claim 9
Dependent Claim
35 words
Heat transfer apparatus according to claim 7, wherein the starting fluid has a vapour pressure at ambient temperature that is no greater than the vapour pressure in the second heat exchanger under design operating conditions.
Claim 10
Dependent Claim
36 words
Heat transfer apparatus according to claim 7, wherein the connection includes a distillation column separate from or a part of the second heat exchanger for condensing starting fluid from the vapour in the second heat exchanger.
Claim 11
Dependent Claim
25 words
Heat transfer apparatus according to claim 6, wherein a shut-off valve is interposed between tbe tank and the vapour side of the second heat exchanger.
Claim 12
Dependent Claim
19 words
Heat transfer apparatus according to claim 10, wherein the shut-off valve is operated by a float in the tank.
Claim 13
Dependent Claim
70 words
Heat transfer apparatus according to claim 7, wherein the heat transfer apparatus is a closed Rankine cycle power plant, the first heat exchanger is a boiler, and the second heat exchanger includes a turbine for expanding the boiler vapour and driving a load such as an electrical generator, and a condenser for converting the turbine exhaust vapour to a liquid at a temperature and pressure lower than in the boiler.
Claim 14
Dependent Claim
19 words
Heat transfer apparatus according to claim 10, wherein the operating fluid is ODB and the starting fluid is methylcyclohexane.
Claim 15
Dependent Claim
21 words
Heat transfer apparatus according to claim 12 wherein the tank is maintained at a substantially constant temperature independent of ambient conditions.
Claim 16
Dependent Claim
26 words
Heat transfer apparatus according to claim 14, wherein heat is applied to the boiler by burning fuel and the tank is heated by the flue gases.
References Cited (Backward Citations)
US3172266A
Cited
US3304716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |