Patent US3575157A successfully refreshed from Google Patents.
US3575157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot water heating system for providing hot rinse water at uniform temperature
Assignee: Raypak Co Inc
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Filing: 1970-07-08
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Granted: 1971-04-20
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Expires: 1990-07-08
Abstract
Abstract The invention is in the field of hot water heating and supply systems constructed to be able to supply hot rinse water at a temperature of, for example, 180* to 205* F. for the duration of relatively short but rapid draws, while maintaining this temperature. An accumulator tank of limited volumetric capacity is provided with a primary circulation loop between the lower part of the tank and the heater. The accumulator tank supplies a distribution loop including a dishwasher which is to be supplied with hot rinse water for sanitation purposes, at a temperature to be maintained in a range, for example, of 180* to 205* F. Makeup cold water is supplied from a city water line. A circulator provides for continuous circulation in the primary loop and when there is a draw of hot rinse water, cold water feeds in from the city water line. The heat source is modulated by thermostatic means responsive to the temperature of the incoming water to the heater. The heat source is capable of being modulated over a range adequate to meet load requirements so that in the event of a draw of hot rinse water, this is quickly sensed by the cold water entering the heater, causing immediate response by the thermostatic means so that the temperature in the accumulator tank is effectively maintained during the draw.
Inventors
- 👤 Alfred Whittel Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:52
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
20 words
A system as in claim 1, including a return water line connected to the inlet side of the circulator means.
Claim 2
Dependent Claim
20 words
A system as in claim 1, wherein said controlling means is responsive to temperature of water entering the heat exchanger.
Claim 3
Dependent Claim
160 words
A hot water heating system adapted for supplying relatively high temperature water for sanitary use at substantially constant temperature, comprising a heat exchanger having a limited volumetric capacity, a heat source for applying heat to the heat exchanger, and an accumulator tank for hot water separate from the heat exchanger, circUlator means for maintaining a flow of water in a primary loop which includes the said heat exchanger and a part, at least, of said accumulator tank, a water distribution loop connected to said accumulator tank to receive relatively high temperature water therefrom, the said primary loop in effect, having a bypass relationship with the distribution loop, a source of cold water connected directly to the inlet of the heat exchanger, and means for controlling the heat source in response to water temperature at the heat exchanger whereby upon a demand for water from the accumulator tank the heat source responds so as to maintain the temperature of water supplied.
Claim 4
Dependent Claim
32 words
A system as in claim 4, wherein the temperature-responsive means is positioned to be responsive to water entering the inlet to the heat exchanger to provide for immediate response to load demands.
Claim 5
Dependent Claim
18 words
A system as in claim 4, wherein said controlling means is constructed to modulatingly control the heat source.
Claim 6
Dependent Claim
23 words
A system as in claim 4, wherein said circulator means is positioned to pump out of the tank and into the heat exchanger.
Claim 7
Dependent Claim
18 words
A system as in claim 4, wherein means are provided to normally maintain said circulator in continuous operation.
Claim 8
Dependent Claim
23 words
A system as in claim 4, including means responsive to flow in the said primary loop for causing the heat source to operate.
Claim 9
Dependent Claim
43 words
A system as in claim 4, including a further distribution loop connected to said accumulator tank to receive water therefrom at a lower temperature and means comprising a temperature-responsive valve for controlling the supply of heated water to the said further distribution loop.
Claim 10
Dependent Claim
25 words
A system as in claim 4, wherein said accumulator tank is of relatively small volumetric capacity sufficient to accommodate demands for relatively higher temperature water.
Claim 11
Dependent Claim
18 words
A system as in claim 11, wherein said control means is constructed to modulatingly control said heat source.
Claim 12
Dependent Claim
196 words
A hot water system comprising a heat exchanger of limited volumetric capacity and having a water supply inlet and a service outlet, a heat source for heat to said heat exchanger, a storage tank spaced from the heat exchanger and bypass means including at least a part of the storage tank, pump means for maintaining a substantially uniform velocity recirculating flow of water through said heat exchanger and said bypass means from the heat exchanger outlet to said inlet at all heating loads, said heat exchanger having a construction providing elongated passageway means for the water of a size and configuration to provide a continuous rate of flow comparable to that in the bypass, the heat source being constructed to supply heat along the length of the elongated passageway means such that with the rate of flow of water therethrough, the heat exchanger is capable of transferring heat to the water at a rate necessary to meet instantaneous service demands over a wide range, means for recirculating water through the heat exchanger at a rate necessary to meet service load demands, and means for controlling the heat source in response to temperature at the heat exchanger.
Claim 13
Dependent Claim
27 words
A system as in claim 13, wherein said pump means is in the bypass in a position to circulate water from the tank to the heat exchanger.
Claim 14
Dependent Claim
24 words
A system as in claim 13, including a flow responsive device responsive to recirculating flow through said heat exchanger for controlling said heat source.
Claim 15
Dependent Claim
18 words
A system as in claim 13, wherein said controlling means is constructed to modulatingly control the heat source.
Claim 16
Dependent Claim
20 words
A system as in claim 13, wherein the controlling means is responsive to temperature of water entering the heat exchanger.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |