US5117648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system with ejector and working fluid storage
Assignee: Northeastern University
•
Filing: 1990-10-16
•
Granted: 1992-06-02
•
Expires: 2010-10-16
Abstract
Abstract A refrigeration system particularly suitable for an automobile air conditioning system is disclosed. The refrigeration system uses a hydrocarbon as the working fluid. The system includes an ejector in the refrigeration cycle and a boiler which utilizes waste heat from the automobile engine. A refrigerant storage subsystem may be included in the system to provide an adequate transient response to changes in the waste heat output from the automobile engine and during the engine warm up period.
Inventors
- 👤 Gregory J. Kowalski
- 👤 Arthur R. Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:40
CPC Classifications
F; F25; F25B; F25B45/00; F25B1/00; F25B1/06; F25B1/08; F25B27/00; F25B27/02; B; B60; B60H; B60H1/00; B60H1/32; B60H2001/3286; B60H2001/3295; B60H2001/3298; F25B2400/00; F25B2400/16; F25B2500/00; F25B2500/01; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02A30/274
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
An air conditioning system for an automobile comprising: a working fluid; a condenser for condensing the working fluid to a saturated liquid; a diverter located at the exit of the condenser for diverting the fluid into a first flow path and a second flow path; a boiler located in the first flow path for boiling the working fluid to produce a high velocity saturated vapor; means for supplying waste heat to the boiler from an engine of the automobile; an expansion valve located in the second flow path for decreasing the pressure of the working fluid; an evaporator located in the second flow path after the expansion valve for evaporating the working fluid; an ejector located at a junction of the first and second flow paths for mixing the high velocity saturated vapor from the boiler with the working fluid from the evaporator and for returning the working fluid at an increased pressure to the condenser; and means for compensating for effects of fluctuations in waste heat output from the engine, comprising a high pressure storage tank for storing the working fluid located in a flow path in parallel with the second flow path, and a low pressure storage tank for storing the working fluid located between the exit of the evaporator and the entrance of the ejector.
Claim 2
Dependent Claim
218 words
An air conditioning system for an automobile comprising: a working fluid; a condenser for condensing the working fluid to a saturated liquid; a diverter located at the exit of the condenser for diverting the fluid into a first flow path and a second flow path; a boiler located in the first flow path for boiling the working fluid to produce a high velocity saturated vapor; means for supplying waste heat to the boiler from an engine of the automobile; an expansion valve located in the second flow path for decreasing the pressure of the working fluid; an evaporator located in the second flow path after the expansion valve for evaporating the working fluid; an ejector located at a junction of the first and second flow paths for mixing the high velocity saturated vapor from the boiler with the working fluid from the evaporator and for returning the working fluid at an increased pressure to the condenser; and means for compensating for effects of fluctuations in waste heat output from the engine, comprising a high pressure storage tank for storing the working fluid located in a flow path in parallel with the second flow path, and a low pressure storage tank for storing the working fluid located between the exit of the evaporator and the entrance of the ejector.
Claim 3
Dependent Claim
105 words
The air conditioning system of claim 1, wherein the compensating means further comprising means for reducing flow through the evaporator when the cooling load on the evaporator is less than the energy being removed by the working fluid by directing the working fluid to the low pressure storage tank and accumulating excess fluid in the high pressure storage tank and for increasing flow through the evaporator when the cooling load on the evaporator is greater than the energy being removed by the working fluid by supplying fluid from the high pressure storage tank to the evaporator and withdrawing fluid from the low pressure storage tank.
Claim 4
Dependent Claim
52 words
The air conditioning system of claim 1, further comprising a recuperator located at the exit of the evaporator and piping to direct the working fluid from the condenser to the recuperator and return the working fluid to the diverter to heat the working fluid from the evaporator prior to entering the ejector.
References Cited (Backward Citations)
US2062651A
Cited
US2360969A
Cited
US2353966A
Cited
US2327451A
Cited
US2404778A
Cited
US2683971A
Cited
US3500897A
Cited
US3470707A
Cited
US3670519A
Cited
US3701264A
Cited
US3922877A
Cited
US3945216A
Cited
US3888090A
Cited
US4094170A
Cited
US4006602A
Cited
US4037649A
Cited
US4023948A
Cited
US4169361A
Cited
US4164850A
Cited
US4342200A
Cited
US4127993A
Cited
US4313307A
Cited
US4319462A
Cited
US4250715A
Cited
US4431557A
Cited
US4307575A
Cited
US4384608A
Cited
US4309877A
Cited
US4523437A
Cited
US4557677A
Cited
US4448347A
Cited
US4441332A
Cited
US4574874A
Cited
US4567733A
Cited
US4787444A
Cited
US4612782A
Cited
US4748826A
Cited
US4691532A
Cited
US4742687A
Cited
US4742693A
Cited
US4688394A
Cited
US4690209A
Cited
US4770606A
Cited
US4864831A
Cited
US4817395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |