US4742687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual cooling/heating process and composition
Assignee: Columbia Gas System Service Corp
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Filing: 1986-12-22
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Granted: 1988-05-10
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Expires: 2006-12-22
Abstract
Abstract This invention relates to a cooling and heating system which operates on the absorption and phase change heat exchange principle. More particularly it relates to a continuous heat actuated, air cooled, double effect generator cycle, absorption system. In further aspects, this invention relates to a system constructed for use with an absorption refrigeration solution pair consisting of a nonvolatile absorbent and a highly volatile refrigerant which is highly soluble in the absorbent. A disclosed refrigerant pair are ammonia as the refrigerant and sodium thiocyanate as the absorbent. An absorption cycle is disclosed using the thermo physical properties of sodium thiocyanate/ammonia, absorption/refrigerant pair.
Inventors
- 👤 Edward A. Reid
- 👤 F. Bert Cook
- 👤 Edgar M. Purvis, Jr.
- 👤 Horatio H. Krause, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:05
CPC Classifications
F; F25; F25B; F25B29/00; F25B29/006; C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/047; F25B15/00; F25B15/008; F25B33/00; F25B47/00; F25B47/003; F25B2315/00; F25B2315/006; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62; Y02P; Y02P20/00; Y02P20/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
In an absorption refrigeration and/or heating process wherein a highly volatile, chemically and thermally stable refrigerant is alternately absorbed in and expelled from an absorbent solution in a double effect process with condensation and alternate evaporation steps being accomplished at ambient air temperatures, the improvement wherein the refrigerant is ammonia and the absorbent is sodium thiocyanate and the solution is conveyed through a plurality of generators arranged in series and refrigerant is expelled from the solution in each generator.
Claim 2
Dependent Claim
79 words
In an absorption refrigeration and/or heating process wherein a highly volatile, chemically and thermally stable refrigerant is alternately absorbed in and expelled from an absorbent solution in a double effect process with condensation and alternate evaporation steps being accomplished at ambient air temperatures, the improvement wherein the refrigerant is ammonia and the absorbent is sodium thiocyanate and the solution is conveyed through a plurality of generators arranged in series and refrigerant is expelled from the solution in each generator.
Claim 3
Dependent Claim
23 words
The improved process according to claim 1 wherein the process is accomplished utilizing a maximum operating pressure of at least about 1000 psia.
Claim 4
Dependent Claim
36 words
The improved process according to claim 1 wherein the refrigerant desorbed in a first of the generators is conveyed through a second of the generators in heat exchange relationship with solution conveyed from the first generator.
Claim 5
Dependent Claim
35 words
The improved process according to claim 1 wherein the solution is conveyed from the first generator through a recuperative relationship with solution being conveyed to the first generator, before being conveyed to the second generator.
Claim 6
Dependent Claim
57 words
The improved process according to claim 3 wherein the refrigerant from the first generator is conveyed from the second generator through an expansion valve before being conveyed to a condenser, and is reduced in pressure to the pressure of the refrigerant in the second generator; and the refrigerant from the second generator is conveyed to the condenser.
Claim 7
Dependent Claim
31 words
The improved process according to claim 5 wherein the weak solution is conveyed from the second generator through a recuperative relationship with the strong solution being conveyed to the first generator.
Claim 8
Dependent Claim
89 words
In an absorption refrigeration and/or heating process according to claim 5, the improvement which comprises: (a) conveying the condensed refrigerant from the condensor to an evaporator through an expansion valve which reduces the pressure from that of the condenser to a pressure which evaporates the refrigerant in the evaporator; (b) the refrigerant in the evaporator is conveyed in heat exchange relationship with a load in the refrigeration process or a secondary heat source in the heating process; and (c) the refrigerant from the evaporator is conveyed to an absorber.
Claim 9
Dependent Claim
19 words
In a process according to claim 1, the further improvement wherein the absorbent solution contains an additive, comprising triethylenetetramine.
Claim 10
Dependent Claim
30 words
A process according to claim 8 wherein the solution comprises about 45 percent by weight ammonia, about 54 percent by weight sodium thiocyanate, and about 1 percent by weight triethylenetetramine.
Claim 11
Dependent Claim
186 words
In an absorption refrigeration and/or heating process wherein a highly volatile, chemically and thermally stable refrigerant is alternately absorbed in and expelled from an absorbent solution in a double effect process with condensation and alternate evaporation steps being accomplished at ambient air temperatures, the improvement wherein the refrigerant is ammonia and the absorbent is sodium thiocyanate, and the solution is conveyed through a plurality of generators arranged in series and refrigerant is expelled from the solution in each generator, and the refrigerant desorbed in a first of the generators is conveyed through a second of the generators in heat exchange relationship with solution conveyed from the first generator, and the solution is conveyed from the first generator through a recuperative relationship with solution being conveyed to the first generator, before being conveyed to the second generator, and wherein the solution passing from the first generator in recuperative relationship with the solution flowing through the generators is conveyed through an isanthalpic throttling valve and reduced in pressure to a pressure suitable for desorption in the second generator by heat transmission from the refrigerant in the second generator.
Claim 12
Dependent Claim
186 words
In an absorption refrigeration and/or heating process wherein a highly volatile, chemically and thermally stable refrigerant is alternately absorbed in and expelled from an absorbent solution in a double effect process with condensation and alternate evaporation steps being accomplished at ambient air temperatures, the improvement wherein the refrigerant is ammonia and the absorbent is sodium thiocyanate, and the solution is conveyed through a plurality of generators arranged in series and refrigerant is expelled from the solution in each generator, and the refrigerant desorbed in a first of the generators is conveyed through a second of the generators in heat exchange relationship with solution conveyed from the first generator, and the solution is conveyed from the first generator through a recuperative relationship with solution being conveyed to the first generator, before being conveyed to the second generator, and wherein the solution passing from the first generator in recuperative relationship with the solution flowing through the generators is conveyed through an isanthalpic throttling valve and reduced in pressure to a pressure suitable for desorption in the second generator by heat transmission from the refrigerant in the second generator.
References Cited (Backward Citations)
US2308665A
Cited
US3458445A
Cited
US3389574A
Cited
US3721109A
Cited
US3710852A
Cited
US4085595A
Cited
US4085596A
Cited
US4183228A
Cited
US4551991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |