US4037567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heating system including recycle loop
Assignee: Individual
•
Filing: 1976-01-15
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Granted: 1977-07-26
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Expires: 1996-01-15
Abstract
Abstract A water heating system includes a boiler which is connected with a source of water supply for receiving water under pressure. An exhaust flue is connected to the boiler for the discharge of gaseous products of combustion. A pair of concentrically arranged coils is positioned within the exhaust flue and is connected with the conduit feeding water to the boiler. A recycle loop is thus provided for withdrawing a minor portion of the water being fed to the boiler and for recycling same at a higher temperature to the feed conduit. The water circulates within the loop by natural connection.
Inventors
- 👤 Peter L. Torres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:00
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; F28; F28D; F28D21/00; F28D21/0001; F28D21/0003; F28D21/0005; F28D21/0007; F24; F24D; F24D2200/00; F24D2200/16; F24D2200/18; Y; Y10; Y10S; Y10S165/00; Y10S165/901; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85954
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
In a water heating system which includes a boiler, first conduit means connected between a water supply and said boiler, means for heating the water within and means for supplying water under pressure to said boiler, and an exhaust flue for discharging heated products of combustion from said boiler, the improvement comprising: at least one coil of heat conductive material positioned within said exhaust flue; second conduit means connected between said first conduit means and the lower end of said coil for withdrawing a minor portion of the water being conducted to said boiler for passage through said coil in heat exchange relation with the combustion gases discharged through said flue; and third conduit means connected between the upper end of said coil and said first conduit means upstream of the point of connection between said first and second conduit means for the recycling of heated water to said first conduit means, whereby a recycle loop is provided for the heating of a portion of the water being conducted from said water supply to said boiler.
Claim 2
Dependent Claim
176 words
In a water heating system which includes a boiler, first conduit means connected between a water supply and said boiler, means for heating the water within and means for supplying water under pressure to said boiler, and an exhaust flue for discharging heated products of combustion from said boiler, the improvement comprising: at least one coil of heat conductive material positioned within said exhaust flue; second conduit means connected between said first conduit means and the lower end of said coil for withdrawing a minor portion of the water being conducted to said boiler for passage through said coil in heat exchange relation with the combustion gases discharged through said flue; and third conduit means connected between the upper end of said coil and said first conduit means upstream of the point of connection between said first and second conduit means for the recycling of heated water to said first conduit means, whereby a recycle loop is provided for the heating of a portion of the water being conducted from said water supply to said boiler.
Claim 3
Dependent Claim
78 words
A water heating system according to claim 1, including first and second coils concentrically arranged within said exhaust flue, said coils being in communication at their respective lower and upper ends with said second and third conduits such that water from said second conduit means is heated and caused to flow upwardly simultaneously within both of said coils by means of natural convection and is recycled to said first conduit from said coils through said third conduit means.
Claim 4
Dependent Claim
33 words
A water heating system according to claim 1, including a pump in said first conduit downstream of the point of connection between said first and second conduit means and upstream of said boiler.
Claim 5
Dependent Claim
30 words
A water heating system according to claim 1, wherein the inner diameter of said second and third conduit means is less than the inner diameter of said first conduit means.
References Cited (Backward Citations)
US447330A
Cited
US1107534A
Cited
US1458876A
Cited
US2038982A
Cited
US2143287A
Cited
US2189749A
Cited
US2521462A
Cited
US3413969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |