US3556200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating and cooling system
Assignee: Carrier Corp
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Filing: 1968-12-18
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Granted: 1971-01-19
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Expires: 1988-12-18
Abstract
Abstract An absorption refrigeration system having a cooling and a heating mode of operation. A generator, an air cooled condenser, a two-stage air cooled absorber, a two-stage adiabatic evaporator and an air conditioning fan coil unit are connected to provide cooling. The system has means for automatically adjusting the concentration of refrigerant and absorbent in accordance with low ambient absorber temperatures. A heating mode of operation is provided wherein absorbent solution is heated in the generator and passed through the fan coil unit back to the generator to supply heat to a space being conditioned.
Inventors
- 👤 Louis H Leonard Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:29
CPC Classifications
F; F25; F25B; F25B30/00; F25B30/04; F25B15/00; F25B15/02; F25B15/06; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
278 words
A heating and cooling system having a heating mode of operation and a cooling mode of operation, and means to select one of said modes of operation thereof: A. said system in the cooling mode of operation comprising a generator for boiling absorbent solution to concentrate said solution, a condenser for condensing refrigerant vapor formed in said generator, an evaporator for evaporating refrigerant condensed in said condenser to provide cooling, an absorber for absorbing refrigerant vapor concentrated in said evaporator into absorbent solution concentrated in the generator, and means connecting said generator, condenser, evaporator and absorber to provide refrigeration; B. said system in the heating made of operation comprising means for mixing the absorbent solution and the refrigerant to form a heating liquid, means including said generator for heating said heating liquid, means including a heat rejecting exchanger for passing heated heating liquid in heat exchange relation with a heating load to provide heating, passage means for passing heated heating liquid from the generator through said heat exchanger and back to said generator for reheating therein; and C. concentration control passage means connecting the evaporator and the generator, operative upon switching said system from the heating mode of operation to the cooling mode of operation thereof, for passing a portion of the refrigerant liquid having absorbent solution mixed therewith through said concentration control passage to the generator for separation of refrigerant and absorbent until the refrigerant concentration in the evaporator is sufficient to provide the required refrigeration load, and for reducing the passage of liquid refrigerant to the generator before complete concentration of the refrigerant if the refrigerant reaches a sufficient concentration to provide the required refrigeration load.
Claim 2
Dependent Claim
278 words
A heating and cooling system having a heating mode of operation and a cooling mode of operation, and means to select one of said modes of operation thereof: A. said system in the cooling mode of operation comprising a generator for boiling absorbent solution to concentrate said solution, a condenser for condensing refrigerant vapor formed in said generator, an evaporator for evaporating refrigerant condensed in said condenser to provide cooling, an absorber for absorbing refrigerant vapor concentrated in said evaporator into absorbent solution concentrated in the generator, and means connecting said generator, condenser, evaporator and absorber to provide refrigeration; B. said system in the heating made of operation comprising means for mixing the absorbent solution and the refrigerant to form a heating liquid, means including said generator for heating said heating liquid, means including a heat rejecting exchanger for passing heated heating liquid in heat exchange relation with a heating load to provide heating, passage means for passing heated heating liquid from the generator through said heat exchanger and back to said generator for reheating therein; and C. concentration control passage means connecting the evaporator and the generator, operative upon switching said system from the heating mode of operation to the cooling mode of operation thereof, for passing a portion of the refrigerant liquid having absorbent solution mixed therewith through said concentration control passage to the generator for separation of refrigerant and absorbent until the refrigerant concentration in the evaporator is sufficient to provide the required refrigeration load, and for reducing the passage of liquid refrigerant to the generator before complete concentration of the refrigerant if the refrigerant reaches a sufficient concentration to provide the required refrigeration load.
Claim 3
Dependent Claim
94 words
A heating and cooling system as defined in claim 1 wherein said system includes: A. an absorbent solution sump for collecting weak absorbent solution from said absorber; B. a refrigerant sump for collecting refrigerant from said evaporator; and C. the refrigerant concentration control passage means extending between the refrigerant sump and said absorbent sump, said passage being arranged for passage of liquid from said refrigerant sump to sAid absorbent sump in response to the relative quantity of absorbent solution passing to said absorber sump and the quantity of refrigerant passing to said evaporator sump.
Claim 4
Independent Claim
264 words
A method of operating a heating and cooling system, said system in the cooling mode of operation thereof containing an absorbent solution and a refrigerant and said system having a generator for boiling absorbent solution to concentrate the solution by vaporizing refrigerant therefrom, a condenser for condensing refrigerant vaporized in said generator, an evaporator for evaporating refrigerant condensed in said condenser to provide cooling, and an absorber for absorbing refrigerant evaporated in said evaporator into absorbent solution concentrated in said generator; wherein the method of providing heating when said system is in the heating mode of operation comprises: A. mixing the absorbent solution and the refrigerant to form a heating liquid; B. heating liquid absorbent solution in said generator; C. passing heated liquid absorbent solution from said generator through a heat exchange in heat exchange relation with a heating load to provide heating thereto; D. passing absorbent solution from said heat exchanger to said generator for reheating therein; and wherein the method of providing cooling comprises: E. switching said system from the heating mode of operation to the cooling mode of operation; F. passing a quantity of refrigerant having absorbent mixed therewith present in said system after switching from heating to the cooling mode of operation, to the generator for separation of refrigerant therefrom, and mixing the separated refrigerant with the remaining refrigerant so as to increase the refrigerant concentration of the remaining refrigerant; and G. reducing the quantity of refrigerant passed to said generator if the refrigerant concentration reaches a sufficient concentration to provide the desired refrigeration capacity prior to complete concentration thereof.
Claim 5
Independent Claim
264 words
A method of operating a heating and cooling system, said system in the cooling mode of operation thereof containing an absorbent solution and a refrigerant and said system having a generator for boiling absorbent solution to concentrate the solution by vaporizing refrigerant therefrom, a condenser for condensing refrigerant vaporized in said generator, an evaporator for evaporating refrigerant condensed in said condenser to provide cooling, and an absorber for absorbing refrigerant evaporated in said evaporator into absorbent solution concentrated in said generator; wherein the method of providing heating when said system is in the heating mode of operation comprises: A. mixing the absorbent solution and the refrigerant to form a heating liquid; B. heating liquid absorbent solution in said generator; C. passing heated liquid absorbent solution from said generator through a heat exchange in heat exchange relation with a heating load to provide heating thereto; D. passing absorbent solution from said heat exchanger to said generator for reheating therein; and wherein the method of providing cooling comprises: E. switching said system from the heating mode of operation to the cooling mode of operation; F. passing a quantity of refrigerant having absorbent mixed therewith present in said system after switching from heating to the cooling mode of operation, to the generator for separation of refrigerant therefrom, and mixing the separated refrigerant with the remaining refrigerant so as to increase the refrigerant concentration of the remaining refrigerant; and G. reducing the quantity of refrigerant passed to said generator if the refrigerant concentration reaches a sufficient concentration to provide the desired refrigeration capacity prior to complete concentration thereof.
Claim 6
Dependent Claim
224 words
A heating and cooling system as defined in claim 1 wherein said heat rejecting heat exchanger of the heating mode of operation comprises a heat absorbing heat exchanger of the cooling mode; said refrigerant comprising water; said absorbent solution comprising a lithium halide; and wherein said system includes: A. a refrigerant sump for collecting cooled, unevaporated liquid refrigerant from said evaporator when the system is in the cooling mode of operation; B. passage means associated with said refrigerant sump for passing cooled liquid refrigerant from said liquid sump to said heat absorbing heat exchanger when said system is in the cooling mode of operation; C. passage means for passing liquid refrigerant from said heat absorbing heat exchanger back to said evaporator for cooling therein when said system is in the cooling mode of operation; D. passage means for passing heated absorbent solution from said generator to said refrigerant sump, for passage to said heat rejecting heat exchanger when said system is in the heating mode of operation, thereby diluting the absorbent solution circulating in said system and forming an absorbent solution having a lower freezing temperature than the pure refrigerant or strong solution; and E. passage means for passing liquid absorbent solution from said heat rejecting heat exchanger to said generator for heating therein when said system is in the heating mode of operation.
References Cited (Backward Citations)
US2853276A
Cited
US3153441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |