Method and apparatus for providing on-demand hot water

Details Method and apparatus for providing on-demand hot water Method and apparatus for providing on-demand hot water

2006-01-10

2006-01-10

Wilson, Gregory (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

Heated by liquid or steam

C122S033000

Reexamination Certificate

active

06983723

ABSTRACT:
Waste heat from a steam cycle employing a steam boiler is used to heat water, on an on-demand basis, in a steam-to-water heat exchanger wherein the supply of steam into the heat exchanger is regulated so as to maintain the temperature of the heated water exiting the heat exchanger at a relatively constant pre-set temperature. Further waste heat may be recaptured from the steam boiler steam cycle by pre-heating the incoming cold water being fed into the steam-to-water heat exchanger in the on-demand water heater using the still-hot condensate from the condensation of the steam in the steam-to-water heat exchanger. A condensate-to-water heat exchanger may be employed to pre-heat the cold water infeed to the steam-to-water heat exchanger.

REFERENCES:
patent: 3670807 (1972-06-01), Muller
patent: 4046189 (1977-09-01), Clark, Jr.
patent: 5209284 (1993-05-01), Okamoto et al.

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