US3995809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for air-conditioning of one or more rooms
Assignee: Svenska Flaktfabriken AB
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Filing: 1975-01-21
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Granted: 1976-12-07
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Expires: 1995-01-21
Abstract
Abstract A heating system for a room comprising two heat pumps. A base heat pump is designed so that its evaporator never freezes up or that no frost layer forms during wintertime operation. An auxiliary heat pump is provided and is put into operation during times of extreme cold, whenever the capacity of the base heat pump is not enough to sufficiently heat the room. When the outside heat exchanger of the auxiliary heat pump freezes up, provision is made to reverse the operation of the auxiliary heat pump so the outside heat exchanger becomes the condenser. Thus, the outside heat exchanger is thawed.
Inventors
- 👤 Tord Herlog Ingemar Karlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:14
CPC Classifications
F; F25; F25B; F25B13/00; F25B29/00; F25B29/003; F25B2313/00; F25B2313/027; F25B2313/02741; F25B2400/00; F25B2400/06; F25B2500/00; F25B2500/31
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
330 words
A heat pump system for heating a room having room-air exhaust means for delivering substantially only exhaust air from said room to the outside atmosphere, comprising: base heat-pump means, comprising first heat exchanger means in heat-exchange relation with exhaust air in said room-air exhaust means, second heat exchanger means in heat-exchange relation with air supplied to said room, first means for circulating a fluid medium between said first and second heat exchanger means, and first compressor means cooperating with said first circulating means and acting on said fluid medium for operating said first heat exchanger means as an evaporator to absorb heat from said exhaust air and for operating said second heat exchanger means as a condenser to deliver heat to said room; auxiliary heat-pump means, comprising third heat exchanger means in heat-exchange relation with said outside atmosphere, fourth heat exchanger means in heat-exchange relation with said air supplied to said room, second means for circulating a fluid medium between said third and fourth heat exchanger means, and second compressor means cooperating with said second circulating means and acting on said fluid medium for operating said third heat exchanger means as an evaporator to absorb heat from said atmosphere and for operating said fourth heat exchanger means as a condenser to deliver heat to said room; said evaporator of said base heat-pump means being positioned in relation to said room-air exhaust means so that said exhaust air adjacent said last-named evaporator remains above the freezing temperature of water in said air, even when the temperature of said outside atmosphere is substantially below said freezing temperature, whereby frosting of said last-named evaporator is prevented; means for operating said base heat-pump means as demanded for maintaining the desired temperature of said room; and means for operating said auxiliary heat-pump means to effect additional heating of said room only when the temperature of said atmosphere becomes so low that said base heat-pump means is not able by itself to maintain said desired temperature.
Claim 2
Dependent Claim
330 words
A heat pump system for heating a room having room-air exhaust means for delivering substantially only exhaust air from said room to the outside atmosphere, comprising: base heat-pump means, comprising first heat exchanger means in heat-exchange relation with exhaust air in said room-air exhaust means, second heat exchanger means in heat-exchange relation with air supplied to said room, first means for circulating a fluid medium between said first and second heat exchanger means, and first compressor means cooperating with said first circulating means and acting on said fluid medium for operating said first heat exchanger means as an evaporator to absorb heat from said exhaust air and for operating said second heat exchanger means as a condenser to deliver heat to said room; auxiliary heat-pump means, comprising third heat exchanger means in heat-exchange relation with said outside atmosphere, fourth heat exchanger means in heat-exchange relation with said air supplied to said room, second means for circulating a fluid medium between said third and fourth heat exchanger means, and second compressor means cooperating with said second circulating means and acting on said fluid medium for operating said third heat exchanger means as an evaporator to absorb heat from said atmosphere and for operating said fourth heat exchanger means as a condenser to deliver heat to said room; said evaporator of said base heat-pump means being positioned in relation to said room-air exhaust means so that said exhaust air adjacent said last-named evaporator remains above the freezing temperature of water in said air, even when the temperature of said outside atmosphere is substantially below said freezing temperature, whereby frosting of said last-named evaporator is prevented; means for operating said base heat-pump means as demanded for maintaining the desired temperature of said room; and means for operating said auxiliary heat-pump means to effect additional heating of said room only when the temperature of said atmosphere becomes so low that said base heat-pump means is not able by itself to maintain said desired temperature.
Claim 3
Dependent Claim
23 words
The system of claim 1, comprising means for reversing the cycle of said auxiliary heat-pump means as desired to defrost said evaporator thereof.
Claim 4
Dependent Claim
31 words
The system of claim 2, comprising means for delivering heat from said condenser of said base heat-pump means to said evaporator of said auxiliary heat-pump means when defrosting thereof is desired.
Claim 5
Dependent Claim
35 words
The system of claim 3, wherein said condenser of said base heat-pump means is positioned in heat-exchange relation to said condenser of said auxiliary heat-pump means to effect said delivery of heat during said defrosting.
Claim 6
Dependent Claim
32 words
The system of claim 1, comprising means for reversing the cycles of both said base heat-pump means and said auxiliary heat-pump means to effect cooling of said room when same is desired.
Claim 7
Dependent Claim
58 words
The system of claim 1, wherein said room-air exhaust means comprises an exhaust-air duct and said evaporator portion of said first heat exchanger is positioned in said exhaust-air duct, said system also comprising an air supply duct for said room, said second and fourth heat exchanger means having their operative portions positioned within said room air supply duct.
Claim 8
Dependent Claim
30 words
The system of claim 1, wherein said condenser of said auxiliary heat-pump means is located in a cooler part of said system than said condenser of said base heat-pump means.
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) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |