US4307577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system making use of waste heat
Assignee: National Institute of Advanced Industrial Science and Technology
•
Filing: 1980-03-27
•
Granted: 1981-12-29
•
Expires: 2000-03-27
Abstract
Abstract An air conditioning system making use of waste heat comprising a compound absorption refrigeration machine and absorption type heat pump for both cooling and heating. The refrigeration machine and the heat pump are connected in parallel to the load to obtain hot water for utility of air heating, and the refrigeration machine operates utilizing hot water produced by the heat pump to produce cold water for air cooling.
Inventors
- 👤 Hideyuki Watanabe
- 👤 Tadao Shimada
- 👤 Yonezo Ikumi
- 👤 Atsuo Fukino
- 👤 Hiroyoshi Kusakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:30
CPC Classifications
F; F25; F25B; F25B15/00; F25B15/02; F25B29/00; F25B29/006; Y; Y02; Y02A; Y02A30/00; Y02A30/27; Y02B; Y02B30/00; Y02B30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
An air conditioning system making use of waste heat comprising, in combination, an absorption refrigeration machine switchable between operation modes for cooling and heating, said refrigeration machine using a high-temperature fluid such as hot water or steam as a first driving heat source, and an absorption type heat pump making use of warm waste water as a second driving heat source and as an absorption heat source to thereby obtain hot water hotter than said second driving heat source, whereby, in the operation mode for heating, said absorption refrigeration machine and said absorption type heat pump are connected in parallel to a load so that hot water obtained by the heating mode of said absorption refrigeration machine and hot water obtained from said absorption type heat pump are directly fed to said load, whereas, in the operation mode for cooling, said absorption refrigeration machine is operated utilizing the hot water produced by said absorption type heat pump as a heat source to produce cold water or ice for cooling purpose, the hot water produced by said absorption type heat pump replacing said first driving heat source in the operation mode for cooling.
Claim 2
Dependent Claim
192 words
An air conditioning system making use of waste heat comprising, in combination, an absorption refrigeration machine switchable between operation modes for cooling and heating, said refrigeration machine using a high-temperature fluid such as hot water or steam as a first driving heat source, and an absorption type heat pump making use of warm waste water as a second driving heat source and as an absorption heat source to thereby obtain hot water hotter than said second driving heat source, whereby, in the operation mode for heating, said absorption refrigeration machine and said absorption type heat pump are connected in parallel to a load so that hot water obtained by the heating mode of said absorption refrigeration machine and hot water obtained from said absorption type heat pump are directly fed to said load, whereas, in the operation mode for cooling, said absorption refrigeration machine is operated utilizing the hot water produced by said absorption type heat pump as a heat source to produce cold water or ice for cooling purpose, the hot water produced by said absorption type heat pump replacing said first driving heat source in the operation mode for cooling.
Claim 3
Dependent Claim
50 words
An air conditioning system according to claim 1, in which said absorption type heat pump is constituted by two heat pumps connected in two stages, each of said heat pumps having an upper barrel containing an absorber and an evaporator, and a lower barrel containing a condenser and a generator.
Claim 4
Dependent Claim
125 words
An air conditioning system according to claim 1, in which said absorption type heat pump includes an upper barrel containing a first stage absorber, a second stage absorber and an evaporator common to the first and second stages, a lower barrel containing a first stage generator, a second stage generator and a condenser common to the first and second stages, and wherein warm water is used for supplying heat to said evaporator and said first stage generator, cooling water is used for cooling said condenser and the warm water heated by said first stage absorber is used for transferring heat to said second stage generator, whereby hot water is available at said second stage absorber as a result of operation of two heat pump cycles.
Claim 5
Dependent Claim
37 words
An air conditioning system according to claim 3, characterized by further comprising heat exchangers disposed between said first stage generator and said first stage absorber and between said second stage generator and said second stage absorber, respectively.
Claim 6
Dependent Claim
53 words
An air conditioning system according to claim 4, characterized by further comprising a refrigerant pump attached to said condenser, a warm water pump attached to said first stage absorber and a refrigerant circulation pump attached to said evaporator, whereby the liquefied refrigerant in said evaporator is forcibly dropped onto the heat transfer tubes.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |