US3675441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stage refrigeration plant having a plurality of first stage refrigeration systems
Assignee: Trane US Inc
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Filing: 1970-11-19
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Granted: 1972-07-11
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Expires: 1990-11-19
Abstract
Abstract This is a two stage refrigeration plant consisting of a plurality of first stage change of phase refrigeration systems and one or more second stage liquid coolant circulation systems interconnected by heat exchange systems. One heat exchange system transfers heat from the brine or other liquid coolant circulating through one or more of the liquid coolant chilling elements in the second stage to the refrigerant in one or more of the evaporators of the first stage to thereby chill the liquid coolant and cool the associated space cooling elements. Another heat exchange system transfers heat from the hot refrigerant gas flowing between the compressor and condenser in one or more of the first stage refrigeration systems to the brine or other liquid in one or more of the second stage liquid coolant circulation systems to heat the liquid and thereby permit defrosting of the associated space cooling elements. One or more of the first stage refrigeration systems may be operated selectively at their most efficient capacity to satisfy the cooling requirements of one or more of the second stage liquid coolant circulation systems.
Inventors
- 👤 Arthur Perez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:30
CPC Classifications
F; F25; F25D; F25D21/00; F25D21/06; F25B; F25B1/00; F25B25/00; F25B25/005; F25D17/00; F25D17/02; F25B2309/00; F25B2309/06; F25B2400/00; F25B2400/06; F25B2400/07; F25B2400/075
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
499 words
A two stage refrigeration plant having a plurality of first stage change of phase refrigeration systems and at least one second stage liquid coolant circulation system comprising: a first first stage change of phase refrigeration system including; a change of phase refrigerant, a first compressor, a first condenser, a first evaporator, a first high pressure hot gas supply line running from said first compressor to said first condenser, a first liquid refrigerant supply line running from said first condenser to said first evaporator, a first metering device in said first liquid refrigerant supply line capable of controlling the flow of refrigerant to said first evaporator in accordance with the requirements of said first evaporator, a first low pressure supply line running from said first evaporator to said first compressor thereby completing the circulation circuit for said first refrigeration system; a second first stage change of phase refrigeration system including; a change of phase refrigerant, a second compressor, a second condenser, a second evaporator, a second high pressure hot gas supply line running from said second compressor to said second condenser, a second liquid refrigerant supply line running from said second condenser to said second evaporator, a second metering device in said second liquid refrigerant supply line capable of controlling the flow of refrigerant to said second evaporator in accordance with the requirements of said last mentioned evaporator, a second low pressure gas supply line running from said second evaporator to said second compressor thereby completing the refrigerant circulation circuit for said second change of phase refrigeration system, a second stage liquid coolant circulation system including; a liquid coolant a liquid coolant circulation pump, a space cooling element, a first liquid coolant chilling element in heat transfer relationship with said first evaporator, a second liquid coolant chilling element in heat transfer relationship with said second evaporator, a selector valve having a liquid coolAnt inlet and two liquid coolant outlets either or both of which outlets may be selectively placed in communication with said inlet by actuation of said selector valve, a first liquid coolant supply line running from said pump to said space cooling element, a second liquid coolant supply line running from said space cooling element to said selector valve inlet, a third liquid coolant supply line running from the first of said two liquid coolant outlets to said first liquid coolant chilling element, a fourth liquid coolant supply line running from the second of said two liquid coolant outlets to said second liquid coolant chilling element, a fifth and sixth liquid coolant supply line connecting said first liquid coolant chilling element and said second liquid coolant chilling element respectively to said circulation pump to thereby complete the liquid coolant circulation circuit, means for actuating said selector valve to place said second liquid coolant supply line in communication with either or both of said third and fourth liquid coolant supply lines to thereby place one or more of said liquid coolant cooling elements in said liquid coolant circulation system.
Claim 2
Dependent Claim
499 words
A two stage refrigeration plant having a plurality of first stage change of phase refrigeration systems and at least one second stage liquid coolant circulation system comprising: a first first stage change of phase refrigeration system including; a change of phase refrigerant, a first compressor, a first condenser, a first evaporator, a first high pressure hot gas supply line running from said first compressor to said first condenser, a first liquid refrigerant supply line running from said first condenser to said first evaporator, a first metering device in said first liquid refrigerant supply line capable of controlling the flow of refrigerant to said first evaporator in accordance with the requirements of said first evaporator, a first low pressure supply line running from said first evaporator to said first compressor thereby completing the circulation circuit for said first refrigeration system; a second first stage change of phase refrigeration system including; a change of phase refrigerant, a second compressor, a second condenser, a second evaporator, a second high pressure hot gas supply line running from said second compressor to said second condenser, a second liquid refrigerant supply line running from said second condenser to said second evaporator, a second metering device in said second liquid refrigerant supply line capable of controlling the flow of refrigerant to said second evaporator in accordance with the requirements of said last mentioned evaporator, a second low pressure gas supply line running from said second evaporator to said second compressor thereby completing the refrigerant circulation circuit for said second change of phase refrigeration system, a second stage liquid coolant circulation system including; a liquid coolant a liquid coolant circulation pump, a space cooling element, a first liquid coolant chilling element in heat transfer relationship with said first evaporator, a second liquid coolant chilling element in heat transfer relationship with said second evaporator, a selector valve having a liquid coolAnt inlet and two liquid coolant outlets either or both of which outlets may be selectively placed in communication with said inlet by actuation of said selector valve, a first liquid coolant supply line running from said pump to said space cooling element, a second liquid coolant supply line running from said space cooling element to said selector valve inlet, a third liquid coolant supply line running from the first of said two liquid coolant outlets to said first liquid coolant chilling element, a fourth liquid coolant supply line running from the second of said two liquid coolant outlets to said second liquid coolant chilling element, a fifth and sixth liquid coolant supply line connecting said first liquid coolant chilling element and said second liquid coolant chilling element respectively to said circulation pump to thereby complete the liquid coolant circulation circuit, means for actuating said selector valve to place said second liquid coolant supply line in communication with either or both of said third and fourth liquid coolant supply lines to thereby place one or more of said liquid coolant cooling elements in said liquid coolant circulation system.
Claim 3
Dependent Claim
273 words
A two stage refrigeration plant as claimed in claim 1 having: a second second-stage liquid coolant circulation system including: a liquid coolant, a second liquid coolant circulation pump, a second space cooling element, a third liquid coolant chilling element in heat transfer relationship with said first evaporator, a fourth liquid coolant chilling element in heat transfer relationship with said second evaporator, a second selector valve having a liquid coolant inlet and two liquid coolant outlets either or both of which outlets may be selectively placed in communication with said inlet by actuation of said selector valve, a seventh liquid coolant supply line running from said second pump to said second space cooling element, an eighth liquid coolant supply line running from said second space cooling element to said second selector valve inlet, a ninth liquid coolant supply line running from the first of said two liquid coolant outlets in said second selector valve to said third liquid coolant chilling element, a 10th liquid coolant supply line running from the second of said two liquid coolant outlets in said second selector valve to said fourth liquid coolant chilling element, an 11th and 12th liquid coolant supply line connecting said third liquid coolant chilling element and said fourth liquid coolant chilling element respectively to said second circulation pump to thereby complete said second liquid coolant circulation circuit, means for actuating said second selector valve to place said eighth liquid coolant supply line in communication with either or both of said ninth and 10th liquid coolant supply lines to thereby place one or more of said liquid coolant elements in said second liquid coolant circulation system.
Claim 4
Dependent Claim
230 words
A two stage refrigeration plant as claimed in claim 1 in which: each of said first stage change of phase refrigeration systems includes a hot gas heat exchange element located respectively in each of said high pressure hot gas supply lines between each associated compressor and condenser, said second stage liquid coolant circulation system including a liquid coolant heating element, and said hot gas heat exchange elements and said liquid coolant heating element forming a defroster heat exchange system whereby heat may be transferred from each of said hot gas heat exchange elements to said liquid coolant heating element, a second selector valve having an inlet and a first outlet in said second liquid coolant supply line and a second liquid coolant outlet, either of said outlets capable of being selectively placed in communication with said inlet by actuation of said second selector valve, a seventh liquid coolant supply line running from said second outlet to said liquid cooLant heating element, and an eighth liquid coolant supply line running from said liquid coolant heating element to said circulation pump to thereby complete the liquid coolant circulation circuit, means for actuating said second selector valve to place said second liquid coolant supply line in communication with said seventh liquid coolant supply line and thereby circulate said liquid coolant through said liquid coolant heating element to thereby defrost said space cooling elements.
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |