US4449511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperative furnace
Assignee: Goodman Co LP
•
Filing: 1983-01-06
•
Granted: 1984-05-22
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Expires: 2003-01-06
Abstract
Abstract A recuperative furnace and method for heating wherein the recirculation air blower directs the return air upwardly first to a recuperative heat exchanger and then to a second heat exchanger operating from the heat of combustion. The flue gases are routed directly to the recuperative heat exchanger where a portion of the products of combustion condense. Accordingly, the recuperative heat exchanger not only provides sensible heat transfer from the flue gases but also recovers a portion of the latent heat of vaporization. The second heat exchanger transfers heat from a solution to the recirculation air. The solution flows through a closed loop between the second heat exchanger and a heat transfer module which includes the burner.
Inventors
- 👤 Herbert G. Hays
- 👤 Warren W. Kuipers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:41
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087; F24H8/00; Y; Y02; Y02B; Y02B30/00; Y10; Y10S; Y10S165/00; Y10S165/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A forced air furnace, comprising: means for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said combusting means, said first heat exchanger transferring heat from said heat of combustion to a fluid; a second heat exchanger; means for recirculating said fluid between said first and second heat exchangers; a third heat exchanger communicating with said combusting means wherein products of combustion from said combusting means are passed through said third heat exchanger; an air blower having its output coupled to said third heat exchanger for preheating said air from thermal transfer from said products of combustion and from heat of condensation resulting from a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being coupled to said second heat exchanger for thermal transfer from said fluid.
Claim 2
Dependent Claim
146 words
A forced air furnace, comprising: means for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said combusting means, said first heat exchanger transferring heat from said heat of combustion to a fluid; a second heat exchanger; means for recirculating said fluid between said first and second heat exchangers; a third heat exchanger communicating with said combusting means wherein products of combustion from said combusting means are passed through said third heat exchanger; an air blower having its output coupled to said third heat exchanger for preheating said air from thermal transfer from said products of combustion and from heat of condensation resulting from a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being coupled to said second heat exchanger for thermal transfer from said fluid.
Claim 3
Dependent Claim
21 words
The furnace recited in claim 1 wherein said third heat exchanger comprises a plurality of tubes surrounded by thermal transfer fins.
Claim 4
Dependent Claim
29 words
The furnace recited in claim 1 further comprising an air duct housing said second and third heat exchangers, said second heat exchanger being positioned above said third heat exchanger.
Claim 5
Dependent Claim
167 words
A forced air furnace, comprising: a burner for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said burner, said first heat exchanger transferring heat from said heat of combustion to a fluid; a vertical air duct; a second heat exchanger positioned within said air duct; means for recirculating said fluid between said first and second heat exchangers; a third heat exchanger positioned within said air duct below said second heat exchanger, said third heat exchanger receiving products of combustion from said burner; an air blower positioned below said duct and communicating therewith wherein air from said blower is directed upwards through said duct, said air being preheated by thermal transfer from said products of combustion and from heat of condensation given off by a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being further heated by thermal transfer from said fluid in said second heat exchanger.
Claim 6
Dependent Claim
167 words
A forced air furnace, comprising: a burner for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said burner, said first heat exchanger transferring heat from said heat of combustion to a fluid; a vertical air duct; a second heat exchanger positioned within said air duct; means for recirculating said fluid between said first and second heat exchangers; a third heat exchanger positioned within said air duct below said second heat exchanger, said third heat exchanger receiving products of combustion from said burner; an air blower positioned below said duct and communicating therewith wherein air from said blower is directed upwards through said duct, said air being preheated by thermal transfer from said products of combustion and from heat of condensation given off by a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being further heated by thermal transfer from said fluid in said second heat exchanger.
Claim 7
Dependent Claim
21 words
The furnace recited in claim 4 wherein said third heat exchanger comprises a plurality of tubes surrounded by thermal transfer fins.
Claim 8
Dependent Claim
14 words
The furnace recited in claim 5 wherein said tubes are fabricated of stainless steel.
Claim 9
Dependent Claim
26 words
The furnace recited in claim 5 further comprising a stainless steel input manifold and a stainless steel exhaust manifold coupled to respective ends of said tubes.
Claim 10
Dependent Claim
213 words
A residential forced air furnace, comprising: a burner for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said burner, said first heat exchanger transferring heat from said heat of combustion to a fluid; a vertical air duct; a second heat exchanger positioned within said air duct; means for recirculating said fluid between said first and second heat exchangers, said recirculating means comprising a pump; a third heat exchanger positioned within said air duct below said second heat exchanger, said third heat exchanger receiving products of combustion directly from said burner, said third heat exchanger comprising a plurality of stainless steel tubes surrounded by thermal transfer fins, the ends of said tubes respectively communicating with stainless steel input and exhaust manifolds; said exhaust manifold communicating with a flue pipe; an air blower positioned below said duct and communicating therewith wherein return air from the surrounding is directed upwards through said duct, said air being preheated by thermal transfer from products of combustion and from heat of condensation given off by a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being further heated by thermal transfer from said fluid in said second heat exchanger.
Claim 11
Dependent Claim
213 words
A residential forced air furnace, comprising: a burner for combusting fuel; a first heat exchanger positioned in thermal communication with the heat of combustion of said burner, said first heat exchanger transferring heat from said heat of combustion to a fluid; a vertical air duct; a second heat exchanger positioned within said air duct; means for recirculating said fluid between said first and second heat exchangers, said recirculating means comprising a pump; a third heat exchanger positioned within said air duct below said second heat exchanger, said third heat exchanger receiving products of combustion directly from said burner, said third heat exchanger comprising a plurality of stainless steel tubes surrounded by thermal transfer fins, the ends of said tubes respectively communicating with stainless steel input and exhaust manifolds; said exhaust manifold communicating with a flue pipe; an air blower positioned below said duct and communicating therewith wherein return air from the surrounding is directed upwards through said duct, said air being preheated by thermal transfer from products of combustion and from heat of condensation given off by a portion of said products of combustion condensing within said third heat exchanger; and said preheated air from said third heat exchanger being further heated by thermal transfer from said fluid in said second heat exchanger.
References Cited (Backward Citations)
US2373731A
Cited
US2497184A
Cited
US2827893A
Cited
US2789769A
Cited
US3833170A
Cited
US3997109A
Cited
US3896992A
Cited
US4066210A
Cited
US4158386A
Cited
US4037786A
Cited
US4143816A
Cited
US4090492A
Cited
US4122999A
Cited
US4194558A
Cited
US4178907A
Cited
US4261326A
Cited
US4371111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |