US3831390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling refrigerant temperatures of absorption refrigeration systems
Assignee: York International Corp
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Filing: 1972-12-04
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Granted: 1974-08-27
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Expires: 1992-12-04
Abstract
Abstract A method and apparatus for producing and controlling hygroscopic salt content in the water refrigerant circuit of an absorption refrigeration system by introducing absorbent solution from the solution circuit to the refrigerant circuit and providing a controlled, predetermined percentage of salt concentration in the refrigerant circuit to lower the freezing point of the water refrigerant.
Inventors
- 👤 N Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:30
CPC Classifications
F; F25; F25B; F25B15/00; F25B15/02; F25B15/06; F25B2315/00; F25B2315/001; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A method of producing refrigeration from a closedcircuit, continuous-cycle absorption refrigeration system, which comprises the steps of circulating dilute absorbent solution, including a hygroscopic salt, to a generator in which the refrigerant is vaporized and thereby creating concentrated absorbent solution; passing said concentrated absorbent solution to an absorber; condensing said vaporized refrigerant and passing the condensed refrigerant to an evaporator in vapor communication with the absorber; vaporizing a portion of the condensed refrigerant in said evaporator; providing a refrigerant circuit by passing the unevaporated refrigerant from the evaporation zone and returning it, in spray form to the evaporator; absorbing refrigerant vapors, released in the evaporator in the absorber, withdrawing absorbent solution from the absorber, returning said solution, in spray form, to the absorber wherein the improvement comprises sensing the concentration of salt in said refrigerant by sensing the electrical conductivity of fluid in said refrigerant circuit and passing absorbent solution from said absorber into said refrigerant circuit for mixture with said refrigerant in response to the sensed concentration of said refrigerant to maintain a predetermined concentration of salt in said refrigerant.
Claim 2
Independent Claim
181 words
A method of producing refrigeration from a closedcircuit, continuous-cycle absorption refrigeration system, which comprises the steps of circulating dilute absorbent solution, including a hygroscopic salt, to a generator in which the refrigerant is vaporized and thereby creating concentrated absorbent solution; passing said concentrated absorbent solution to an absorber; condensing said vaporized refrigerant and passing the condensed refrigerant to an evaporator in vapor communication with the absorber; vaporizing a portion of the condensed refrigerant in said evaporator; providing a refrigerant circuit by passing the unevaporated refrigerant from the evaporation zone and returning it, in spray form to the evaporator; absorbing refrigerant vapors, released in the evaporator in the absorber, withdrawing absorbent solution from the absorber, returning said solution, in spray form, to the absorber wherein the improvement comprises sensing the concentration of salt in said refrigerant by sensing the electrical conductivity of fluid in said refrigerant circuit and passing absorbent solution from said absorber into said refrigerant circuit for mixture with said refrigerant in response to the sensed concentration of said refrigerant to maintain a predetermined concentration of salt in said refrigerant.
Claim 3
Independent Claim
181 words
A method of producing refrigeration from a closedcircuit, continuous-cycle absorption refrigeration system, which comprises the steps of circulating dilute absorbent solution, including a hygroscopic salt, to a generator in which the refrigerant is vaporized and thereby creating concentrated absorbent solution; passing said concentrated absorbent solution to an absorber; condensing said vaporized refrigerant and passing the condensed refrigerant to an evaporator in vapor communication with the absorber; vaporizing a portion of the condensed refrigerant in said evaporator; providing a refrigerant circuit by passing the unevaporated refrigerant from the evaporation zone and returning it, in spray form to the evaporator; absorbing refrigerant vapors, released in the evaporator in the absorber, withdrawing absorbent solution from the absorber, returning said solution, in spray form, to the absorber wherein the improvement comprises sensing the concentration of salt in said refrigerant by sensing the specific gravity of fluid in said refrigerant circuit and passing absorbent solution from said absorber into said refrigerant circuit for mixture with said refrigerant in response to the sensed concentration of said refrigerant to maintain a predetermined concentration of salt in said refrigerant.
Claim 4
Independent Claim
181 words
A method of producing refrigeration from a closedcircuit, continuous-cycle absorption refrigeration system, which comprises the steps of circulating dilute absorbent solution, including a hygroscopic salt, to a generator in which the refrigerant is vaporized and thereby creating concentrated absorbent solution; passing said concentrated absorbent solution to an absorber; condensing said vaporized refrigerant and passing the condensed refrigerant to an evaporator in vapor communication with the absorber; vaporizing a portion of the condensed refrigerant in said evaporator; providing a refrigerant circuit by passing the unevaporated refrigerant from the evaporation zone and returning it, in spray form to the evaporator; absorbing refrigerant vapors, released in the evaporator in the absorber, withdrawing absorbent solution from the absorber, returning said solution, in spray form, to the absorber wherein the improvement comprises sensing the concentration of salt in said refrigerant by sensing the specific gravity of fluid in said refrigerant circuit and passing absorbent solution from said absorber into said refrigerant circuit for mixture with said refrigerant in response to the sensed concentration of said refrigerant to maintain a predetermined concentration of salt in said refrigerant.
Claim 5
Dependent Claim
204 words
An absorption refrigeration system comprising: an evaporator for evaporating refrigerant in heat exchange relation with a fluid medium being cooled; an absorber for passing a solution of absorbent and refrigerant in heat exchange relation with a cooling medium to promote absorption of refrigerant vapor by the cooled solution; a generator for passing a heating medium in heat exchange relation with solution to concentrate the solution by vaporizing refrigerant therefrom; a condenser for passing a cooling medium in heat exchange relation with refrigerant vaporized in the generator to condense the refrigerant; a refrigerant circuit for conducting condensed refrigerant from the evaporator and returning the refrigerant, in spray form, to the evaporator; a solution circuit for conducting solution from the absorber and returning the solution, in spray form, to the absorber; passage means for connecting the solution circuit to the refrigerant circuit for mixture of solution with the refrigerant in the refrigerant circuit; sensing means for sensing the concentration of salt in said refrigerant by determining the electrical conductivity of said refrigerant in said refrigerant circuit; and means for controlling the flow of absorbent solution through said passage means in response to said sensing means, whereby a predetermined concentration of salt in said refrigerant is maintained.
Claim 6
Dependent Claim
204 words
An absorption refrigeration system comprising: an evaporator for evaporating refrigerant in heat exchange relation with a fluid medium being cooled; an absorber for passing a solution of absorbent and refrigerant in heat exchange relation with a cooling medium to promote absorption of refrigerant vapor by the cooled solution; a generator for passing a heating medium in heat exchange relation with solution to concentrate the solution by vaporizing refrigerant therefrom; a condenser for passing a cooling medium in heat exchange relation with refrigerant vaporized in the generator to condense the refrigerant; a refrigerant circuit for conducting condensed refrigerant from the evaporator and returning the refrigerant, in spray form, to the evaporator; a solution circuit for conducting solution from the absorber and returning the solution, in spray form, to the absorber; passage means for connecting the solution circuit to the refrigerant circuit for mixture of solution with the refrigerant in the refrigerant circuit; sensing means for sensing the concentration of salt in said refrigerant by determining the electrical conductivity of said refrigerant in said refrigerant circuit; and means for controlling the flow of absorbent solution through said passage means in response to said sensing means, whereby a predetermined concentration of salt in said refrigerant is maintained.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |