US3946802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for heat recovery
Assignee: Individual
•
Filing: 1974-10-08
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Granted: 1976-03-30
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Expires: 1994-10-08
Abstract
Abstract A method and apparatus for a recovery of heat in connection with water and waste pipe systems of the kind wherein a supply pipe for supplying cold water to a water heater and a waste pipe which is supplied with waste water from different consumption points by using the waste water for preheating the cold water before the cold water is supplied to the water heater.
Inventors
- 👤 Rune Christenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:23
CPC Classifications
F; F24; F24D; F24D17/00; F24D17/0036; F24D17/0052; F28; F28D; F28D21/00; F28D21/0001; F28D21/0012; Y; Y02; Y02B; Y02B10/00; Y02B10/70; Y02B30/00; Y02B30/18; Y02B30/56; Y10; Y10S; Y10S165/00; Y10S165/909; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6497
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
Apparatus for recovering heat in water and waste pipe systems, comprising a main supply pipe for cold water, a water heater supplied with water from said supply pipe, a waste pipe which is supplied with waste water from different consumption points and a heat exchanger which is connected with the waste water pipe and is connected between said supply pipe for cold water and the water heater for providing a preheating of the cold water by means of the waste water before the cold water is supplied to the water heater, wherein the apparatus is provided with a branching point before the heat exchanger, from which a first pipe extends to the heat exchanger and a second pipe extends past the heat exchanger and the apparatus comprises a detector and control device for determining the relationship between the temperature of the waste water escaping from said consumption points upstream from the branching point and the temperature of the waste water in the heat exchanger and for directing the escaping waste water to the heat exchanger if the temperature of the waste water therein is lower than the temperature of the escaping waste water and in the opposite case directing the escaping waste water past the heat exchanger.
Claim 2
Dependent Claim
207 words
Apparatus for recovering heat in water and waste pipe systems, comprising a main supply pipe for cold water, a water heater supplied with water from said supply pipe, a waste pipe which is supplied with waste water from different consumption points and a heat exchanger which is connected with the waste water pipe and is connected between said supply pipe for cold water and the water heater for providing a preheating of the cold water by means of the waste water before the cold water is supplied to the water heater, wherein the apparatus is provided with a branching point before the heat exchanger, from which a first pipe extends to the heat exchanger and a second pipe extends past the heat exchanger and the apparatus comprises a detector and control device for determining the relationship between the temperature of the waste water escaping from said consumption points upstream from the branching point and the temperature of the waste water in the heat exchanger and for directing the escaping waste water to the heat exchanger if the temperature of the waste water therein is lower than the temperature of the escaping waste water and in the opposite case directing the escaping waste water past the heat exchanger.
Claim 3
Dependent Claim
74 words
Apparatus as claimed in claim 1, comprising a further heat exchanger adapted to be supplied with the escaping waste water directed past said first mentioned heat exchanger, a further branching point and a further detector and control device associated with the further heat exchanger for providing the same function in relation thereto as the first mentioned branching point and the first mentioned detector and control device in relation to the first mentioned heat exchanger.
Claim 4
Dependent Claim
23 words
Apparatus as claimed in claim 2, wherein the same pipe for cold water from the main supply pipe extends through two heat exchangers.
Claim 5
Dependent Claim
28 words
Apparatus as claimed in claim 1, comprising a separate waste pipe for waste water without substantial heat contents, said pipe extending past the heat exchanger or heat exchangers.
Claim 6
Dependent Claim
14 words
Apparatus as claimed in claim 1, comprising a collecting receptacle before each heat exchanger.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |