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US3717007A
Expired / Lapsed
US
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Absorption refrigeration system with multiple generator stages
Assignee: Dometic Corp
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Filing: 1971-04-02
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Granted: 1973-02-20
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Expires: 1991-04-02
Abstract
Abstract An air-cooled double-effect salt solution absorption refrigeration machine having high and low pressure generator stages is operated with a lower pressure in the evaporator than in the absorber. This achieves a desired low evaporator temperature while permitting the absorber to use an absorbent salt solution having a lower salt concentration and hence a lower crystallization temperature than would otherwise be necessary for the same cooling effect. In order to maintain the pressure differential between the evaporator and the absorber the vapor from the evaporator is compressed to absorber pressure before passing to the absorber. The compression is effected with an ejector device which employs refrigerant vapor flowing from the lower pressure generator stage as the driving fluid.
Inventors
- 👤 D Kuhlenschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:57
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: 10
Claim 1
Independent Claim
196 words
A multi-pressure absorption type refrigeration system comprising: an evaporator for evaporating liquid refrigerant; an absorber vessel for absorbing refrigerant vapor into a liquid absorbent, means for flowing a cooling fluid in heat exchange relationship with the liquid absorbent in said absorber; refrigerant vapor generator means including a high pressure generator vessel heated by a heat source and a low pressure generator vessel heated by hot refrigerant vapor generated in said high pressure generator; transfer and compressor means for receiving refrigerant vapor from said evaporator and for passing the vapor into said absorber vessel at a pressure greater than the pressure in said evaporator and about equal to the pressure existing in said absorber whereby said evaporator develops a lower temperature than would be developed at the pressure existing in said absorber, said means including a first refrigerant vapor conduit extending from said low pressure generator vessel and iNcluding an ejector device for effecting a region of high velocity and low pressure; a second refrigerant vapor conduit extending between said evaporator and said region of low pressure whereby refrigerant vapor flows from said evaporator, mixes with refrigerant vapor from said first conduit and passes to said absorber.
Claim 2
Dependent Claim
196 words
A multi-pressure absorption type refrigeration system comprising: an evaporator for evaporating liquid refrigerant; an absorber vessel for absorbing refrigerant vapor into a liquid absorbent, means for flowing a cooling fluid in heat exchange relationship with the liquid absorbent in said absorber; refrigerant vapor generator means including a high pressure generator vessel heated by a heat source and a low pressure generator vessel heated by hot refrigerant vapor generated in said high pressure generator; transfer and compressor means for receiving refrigerant vapor from said evaporator and for passing the vapor into said absorber vessel at a pressure greater than the pressure in said evaporator and about equal to the pressure existing in said absorber whereby said evaporator develops a lower temperature than would be developed at the pressure existing in said absorber, said means including a first refrigerant vapor conduit extending from said low pressure generator vessel and iNcluding an ejector device for effecting a region of high velocity and low pressure; a second refrigerant vapor conduit extending between said evaporator and said region of low pressure whereby refrigerant vapor flows from said evaporator, mixes with refrigerant vapor from said first conduit and passes to said absorber.
Claim 3
Dependent Claim
196 words
A multi-pressure absorption type refrigeration system comprising: an evaporator for evaporating liquid refrigerant; an absorber vessel for absorbing refrigerant vapor into a liquid absorbent, means for flowing a cooling fluid in heat exchange relationship with the liquid absorbent in said absorber; refrigerant vapor generator means including a high pressure generator vessel heated by a heat source and a low pressure generator vessel heated by hot refrigerant vapor generated in said high pressure generator; transfer and compressor means for receiving refrigerant vapor from said evaporator and for passing the vapor into said absorber vessel at a pressure greater than the pressure in said evaporator and about equal to the pressure existing in said absorber whereby said evaporator develops a lower temperature than would be developed at the pressure existing in said absorber, said means including a first refrigerant vapor conduit extending from said low pressure generator vessel and iNcluding an ejector device for effecting a region of high velocity and low pressure; a second refrigerant vapor conduit extending between said evaporator and said region of low pressure whereby refrigerant vapor flows from said evaporator, mixes with refrigerant vapor from said first conduit and passes to said absorber.
Claim 4
Dependent Claim
196 words
A multi-pressure absorption type refrigeration system comprising: an evaporator for evaporating liquid refrigerant; an absorber vessel for absorbing refrigerant vapor into a liquid absorbent, means for flowing a cooling fluid in heat exchange relationship with the liquid absorbent in said absorber; refrigerant vapor generator means including a high pressure generator vessel heated by a heat source and a low pressure generator vessel heated by hot refrigerant vapor generated in said high pressure generator; transfer and compressor means for receiving refrigerant vapor from said evaporator and for passing the vapor into said absorber vessel at a pressure greater than the pressure in said evaporator and about equal to the pressure existing in said absorber whereby said evaporator develops a lower temperature than would be developed at the pressure existing in said absorber, said means including a first refrigerant vapor conduit extending from said low pressure generator vessel and iNcluding an ejector device for effecting a region of high velocity and low pressure; a second refrigerant vapor conduit extending between said evaporator and said region of low pressure whereby refrigerant vapor flows from said evaporator, mixes with refrigerant vapor from said first conduit and passes to said absorber.
Claim 5
Dependent Claim
24 words
Apparatus as in claim 1 including conduit means for conducting absorbent liquid rich in refrigerant from said absorber to said low pressure generator vessel.
Claim 6
Dependent Claim
24 words
Apparatus as in claim 1 including conduit means for conducting absorbent liquid rich in refrigerant from said absorber to said high pressure generator vessel.
Claim 7
Dependent Claim
24 words
Apparatus as in claim 3 including means for conducting unvaporized refrigerant from said evaporator, vaporizing such refrigerant and conducting the vapor to said absorber.
Claim 8
Independent Claim
147 words
A method of operating a multi-pressure absorption type refrigeration system comprising: evaporating liquid refrigerant in an evaporator vessel; absorbing the resulting refrigerant vapor in a liquid absorbent in an absorber vessel at a higher pressure than exists in the evaporator; flowing a stream of solution of refrigerant in absorbent from the absorber through a first generator vessel and heating said first vessel by a heat source to expel refrigerant vapor, then flowing the solution through a subsequent generator vessel and heating said subsequent vessel by condensing the refrigerant vapor formed in said first vessel thereby forming a stream of refrigerant vapor; withdrawing refrigerant vapor from the evaporator vessel and compressing the withdrawn vapor to about the pressure existing in the absorber vessel by aspirating such vapor with said stream of refrigerant vapor obtained from said subsequent generator vessel; and passing the compressed vapor into the absorber vessel.
Claim 9
Independent Claim
147 words
A method of operating a multi-pressure absorption type refrigeration system comprising: evaporating liquid refrigerant in an evaporator vessel; absorbing the resulting refrigerant vapor in a liquid absorbent in an absorber vessel at a higher pressure than exists in the evaporator; flowing a stream of solution of refrigerant in absorbent from the absorber through a first generator vessel and heating said first vessel by a heat source to expel refrigerant vapor, then flowing the solution through a subsequent generator vessel and heating said subsequent vessel by condensing the refrigerant vapor formed in said first vessel thereby forming a stream of refrigerant vapor; withdrawing refrigerant vapor from the evaporator vessel and compressing the withdrawn vapor to about the pressure existing in the absorber vessel by aspirating such vapor with said stream of refrigerant vapor obtained from said subsequent generator vessel; and passing the compressed vapor into the absorber vessel.
Claim 10
Dependent Claim
50 words
A method as in claim 5 wherein absorbent liquid rich in refrigerant passes from the absorber vessel to the first generator vessel, and wherein unvaporized refrigerant in the evaporator vessel is withdrawn from the evaporator vessel, vaporized and passed into the aspirating stream of vapor flowing from the subsequent generator.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |