US3665724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling refrigeration apparatus
Assignee: Carrier Corp
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Filing: 1970-07-13
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Granted: 1972-05-30
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Expires: 1990-07-13
Abstract
Abstract Refrigerant is passed from a stage other than the last stage of a multistage centrifugal compressor to a waste heat condenser for liquefying refrigerant and returning it to a cooling load evaporator. The latent heat of the refrigerant, along with the heat of compression, is rejected to the atmosphere as by a cooling tower and interconnecting water circuit. There is capacity control means for regulating refrigerant flow from the evaporator to the compressor in accordance with the cooling load imposed on the evaporator. A line is provided for passing refrigerant vapor from the last stage of the compressor to a second condenser, which serves as a heat exchanger for heating a medium for satisfying a heating load demand. A refrigerant line extends from the second condenser to the first condenser. The compressor includes flow control means, as a diffuser sleeve valve, in the last stage operable to regulate the passage of refrigerant vapor to the second condenser in accordance to the heat load imposed thereon. A refrigerant vapor line including a flow control valve extends from the vapor area of the first condenser to the inlet of each stage of the compressor. The flow control valves are operated sequentially according to the pressure in the first condenser to provide a sufficient supply of refrigerant vapor for passage from the last compressor stage to the second condenser to satisfy the heat load impressed thereon.
Inventors
- 👤 Carl M Anderson
- 👤 William T Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F24; F24F; F24F5/00; F25B29/00; F25B29/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
279 words
Apparatus for simultaneously satisfying heating and cooling demands in a building comprising a multistage compressor, a waste heat condenser, and a cooling load evaporator connected to form a circuit including a refrigerant vapor line extending between each stage of said compressor, other than the last stage thereof, and said waste heat condenser, a first liquid refrigerant passage including flow metering means extending from said waste heat condenser to said evaporator, cooling capacity control means regulating the flow of refrigerant vapor from said evaporator to the inlet of said compressor in accordance with the cooling load demand imposed on said apparatus, a heat exchanger, a refrigerant vapor passage extending from the discharge of the last stage of said compressor to said heat exchanger, means for circulating water to be heated for satisfying a heating load demand in heat exchanging relation to the refrigerant in said heat exchanger, a second liquid refrigerant passage including flow metering means extending from said heat exchanger to said waste heat condenser, refrigerant flow control means for regulating the flow of refrigerant vapor from said last stage to said heat exchanger according to the heating load demand imposed on said heat exchanger, a flow control valve in each of said refrigerant vapor lines, one of said valves being opened in the absence of a heating load imposed on said heat exchanger and the others of said valves being closed, flow control valve operating means associated with said waste heat condenser and operable upon the presence of a heating load on said heat exchanger to selectively open and close said flow control valves in said refrigerant vapor lines according to the pressure in said waste heat condenser.
Claim 2
Dependent Claim
279 words
Apparatus for simultaneously satisfying heating and cooling demands in a building comprising a multistage compressor, a waste heat condenser, and a cooling load evaporator connected to form a circuit including a refrigerant vapor line extending between each stage of said compressor, other than the last stage thereof, and said waste heat condenser, a first liquid refrigerant passage including flow metering means extending from said waste heat condenser to said evaporator, cooling capacity control means regulating the flow of refrigerant vapor from said evaporator to the inlet of said compressor in accordance with the cooling load demand imposed on said apparatus, a heat exchanger, a refrigerant vapor passage extending from the discharge of the last stage of said compressor to said heat exchanger, means for circulating water to be heated for satisfying a heating load demand in heat exchanging relation to the refrigerant in said heat exchanger, a second liquid refrigerant passage including flow metering means extending from said heat exchanger to said waste heat condenser, refrigerant flow control means for regulating the flow of refrigerant vapor from said last stage to said heat exchanger according to the heating load demand imposed on said heat exchanger, a flow control valve in each of said refrigerant vapor lines, one of said valves being opened in the absence of a heating load imposed on said heat exchanger and the others of said valves being closed, flow control valve operating means associated with said waste heat condenser and operable upon the presence of a heating load on said heat exchanger to selectively open and close said flow control valves in said refrigerant vapor lines according to the pressure in said waste heat condenser.
Claim 3
Dependent Claim
43 words
Apparatus as set forth in claim 1 wherein said waste heat condenser includes a tube bundle containing a cooling medium, a refrigerant spray Means connected to said second liquid refrigerant passage means and operable to spray the liquid refrigerant on said tube bundle.
Claim 4
Dependent Claim
42 words
Apparatus as set forth in claim 1 wherein said waste heat condenser includes a tube bundle containing a cooling medium, said flow control valve operating means including a temperature sensor responsive to the temperature of said cooling medium in said tube bundle.
Claim 5
Dependent Claim
41 words
Apparatus as set forth in claim 1 wherein said refrigerant flow control means for regulating the flow of refrigerant vapor from said last compressor stage includes a temperature sensor responsive to the temperature of the circulating water in said heat exchanger.
Claim 6
Dependent Claim
40 words
Apparatus as set forth in claim 1 wherein said flow control means for regulating the flow of refrigerant vapor from said last compressor stage includes a temperature sensor responsive to the temperature of the circulating water leaving said heat exchanger.
Claim 7
Dependent Claim
61 words
Apparatus as set forth in claim 1 wherein said refrigerant flow control means for regulating the flow of refrigerant from said last compressor stage includes a diffuser valve operable to vary the flow of refrigerant from said last compressor stage, and a temperature sensor responsive to the temperature of said circulating water in said heat exchanger for operating said diffuser valve.
Claim 8
Dependent Claim
47 words
Apparatus as set forth in claim 1 wherein said one flow control valve opened in the absence of a heating load imposed on said heat exchanger being in the refrigerant vapor line extending from next to the last stage of said compressor to said waste heat condenser.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |