Liquid heaters and vaporizers – Indirectly heated separate injected fluid
Patent
1990-11-05
1992-02-11
Yuen, Henry C.
Liquid heaters and vaporizers
Indirectly heated separate injected fluid
237 8A, 122 312, 126355, 126359, F22B 102, F24H 110
Patent
active
050867318
ABSTRACT:
A gas fired direct contact water heater in which the heated water is led off from a reservoir in a lower part of the heater through an outlet conduit including a continuously running pump pumping the heated water along the conduit to a user's valve which is opened when the user requires heated water. To replace that water a water supply conduit controlled by a ball-cock valve conveys water to a first spray bar in an upper part of the heater above heat transfer means through which passes the downward flowing water and upward flowing products of combustion resultant from the burning fuel gas. A return conduit opens into the outlet conduit between the user's valve and the pump. The return conduit leads to a second spray bar in the heater above the heat transfer means. Included in the return conduit is a pressure release valve which opens automatically when subjected to water at a pre-determined slight pressure, when the user's valve is closed, to allow the pump to circulate the water from the reservoir back to the heater for more heating.
REFERENCES:
patent: 3190283 (1965-06-01), Miyahara
patent: 3386436 (1968-06-01), Miyahara
patent: 3648682 (1972-03-01), Bougard
patent: 3826240 (1974-07-01), Miyahara
patent: 3994281 (1976-11-01), Godant
patent: 4275708 (1981-06-01), Wood
patent: 4530347 (1985-07-01), Baker et al.
patent: 4574775 (1986-03-01), Lutzen et al.
patent: 4658803 (1987-04-01), Ball et al.
patent: 4686940 (1987-08-01), Fullemann
Lockett John F.
Lua Aik B.
British Gas plc
Yuen Henry C.
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