US3732703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning plant for buildings
Assignee: Rinipa AB
•
Filing: 1971-06-28
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Granted: 1973-05-15
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Expires: 1991-06-28
Abstract
Abstract An air conditioning plant for a building basically contains one conduit for admitting air to the building and a further conduit for evacuating air therefrom. The heat applied to the in-coming air largely remains in the out-going air, or may even on occasion have been increased. This heat content may be tranferred back to the inlet air conduit by means of a heat pump having at least one heat exchanger in each conduit. A major problem in an installation of that type is the need for defrosting the evaporating heat exchangers in the exhaust conduit. This problem is solved by providing two heat exchanges in parallel in the exhaust conduit and arranged in such a manner that they will become operative alternately, one serving as evaporator, while the other is being defrosted. By suitable connections, the function of the two types of heat exchangers may be switched, whereby the exchanger in the inlet conduit, instead of working as a condensor, will serve as an evaporator, thereby to cool the incoming air.
Inventors
- 👤 L Nordstrom
- 👤 A Nilsson
- 👤 M Nilsson
- 👤 S Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:28
CPC Classifications
F; F24; F24F; F24F12/00; F24F12/001; F24F12/002; F24F3/00; F24F3/001; F25; F25B; F25B2347/00; F25B2347/02; F25B2347/021; Y; Y02; Y02B; Y02B30/00; Y02B30/56
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
An air conditioning plant for a building in which a first conduit conveys air to the building and a second conduit conveys at least a major part of the air supplied to the building therefrom, the improvement of a heat pump operating with an evaporating fluid, said pump comprising a compressor, at least one first heat exchanger operable as a condenser in connection with the first conduit, at least one heat exchanger operable as an evaporator in connection with the second conduit, and the evaporating and the condensing heat exchangers being formed into a cylindrical, rotating unit working on the general principle of a rotating regenerative heat exchanger, whereby said exchangers will switch position as well as function.
Claim 2
Dependent Claim
118 words
An air conditioning plant for a building in which a first conduit conveys air to the building and a second conduit conveys at least a major part of the air supplied to the building therefrom, the improvement of a heat pump operating with an evaporating fluid, said pump comprising a compressor, at least one first heat exchanger operable as a condenser in connection with the first conduit, at least one heat exchanger operable as an evaporator in connection with the second conduit, and the evaporating and the condensing heat exchangers being formed into a cylindrical, rotating unit working on the general principle of a rotating regenerative heat exchanger, whereby said exchangers will switch position as well as function.
Claim 3
Dependent Claim
61 words
The air conditioning plant according to claim 1, in which the exchanger unit comprises a stationary outer, cylindrical housing for the second conduit, an inner, rotatable housing subdivided into sectors, for the first conduit, and an intermediate, stationary cylindrical drum divided into a number of sector-shaped heat exchanger packages each designed to operate alternately as a condensor or as an evaporator.
Claim 4
Dependent Claim
65 words
The air conditioning plant according to claim 2, in which the high pressure and the low pressure side of said compressor is each connected to every heat exchanger package by means of a outer annular conduit, said annular conduits being provided with a valve at each package, and the rotatable housing being provided with means automatically to operate said valves in step with its rotation.
Claim 5
Dependent Claim
116 words
The air conditioning plant according to claim 2 in which there is an even number of sectors within the heat exchanger unit, the arrangement being such that two diametrically oppositely located sectors always work in the same manner, the inner housing being designed to maintain a connection between at least one sector to each side of a middle plane through the drum in connection with the first conduit and a corresponding number of similarly located sectors in connection with the second conduit, the number of these sectors being less than the total number sectors within the drum, and the remaining sectors being separated from both types of air conduits by means rotating together with the housing.
Claim 6
Dependent Claim
194 words
An air conditioning plant for use in a building including compartments of two basic types having different requirements for heating, including a first conduit for conveying air to the building and a second conduit for conveying at least a major part of the air supplied to the building therefrom, the improvement of a heat pump operating with an evaporating fluid, said pump comprising a compressor, at least one first heat exchanger operable as a condenser in connection with the first conduit, at least one heat exchanger operable as an evaporator in connection with second conduit, said first conduit being divided into two branch conduits of which a first one is further subdivided into two branches to communicate with both types of compartments, the second branch conduit being connected to one of the types of compartments only, the second conduit evacuating both types of compartments having a first condensing heat exchanger in the first inlet branch conduit and a second evaporating heat exchanger in the second conduit, a branch from the second inlet branch conduit being united with a branch from the first branch conduit through a mixing box at the pertaining type of compartment.
Claim 7
Dependent Claim
194 words
An air conditioning plant for use in a building including compartments of two basic types having different requirements for heating, including a first conduit for conveying air to the building and a second conduit for conveying at least a major part of the air supplied to the building therefrom, the improvement of a heat pump operating with an evaporating fluid, said pump comprising a compressor, at least one first heat exchanger operable as a condenser in connection with the first conduit, at least one heat exchanger operable as an evaporator in connection with second conduit, said first conduit being divided into two branch conduits of which a first one is further subdivided into two branches to communicate with both types of compartments, the second branch conduit being connected to one of the types of compartments only, the second conduit evacuating both types of compartments having a first condensing heat exchanger in the first inlet branch conduit and a second evaporating heat exchanger in the second conduit, a branch from the second inlet branch conduit being united with a branch from the first branch conduit through a mixing box at the pertaining type of compartment.
Claim 8
Dependent Claim
39 words
The air conditioning plant according to claim 5, in which the second inlet branch conduit is made to pass a counterflow heat exchanger fitted into the second conduit upstream of the second heat exchanger belonging to the heat pump.
References Cited (Backward Citations)
US2496143A
Cited
US2481348A
Cited
US2581744A
Cited
US2763132A
Cited
US2928255A
Cited
US2907178A
Cited
US2978877A
Cited
US2998710A
Cited
US3060698A
Cited
US3537274A
Cited
US3572052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |