Electric heating – Heating devices – Combined with diverse-type art device
Patent
1980-02-14
1982-08-31
Reynolds, B. A.
Electric heating
Heating devices
Combined with diverse-type art device
219497, 219285, 219286, 122382, 340526, H05B 102, H05B 360
Patent
active
043474306
ABSTRACT:
A water vapor generator having electrodes in a vaporization vessel is disclosed. Current passed through the water between electrodes causes water in the vessel to heat and boil off as steam, make-up water being added when the current drops below a preset minimum value. The make-up water is cut off when a preset maximum value is reached. Thus, the generator operates through successive cycles each containing a descending "boil" leg and an ascending "fill" leg. As water is boiled, its mineral content becomes more and more concentrated, causing increasing its conductivity. To return the water conductivity to its design value the frequency of the boil/fill cycles is measured over several cycles and compared with a predetermined value. If the measured frequency is higher, this indicates a higher than desired water conductivity and a drain cycle is initiated by operating a drain valve. The amount of water drained out of the vessel is proportional to the deviation of frequency from the predetermined value. The frequency can be measured by the duration of a predetermined number of cycles and this is then compared with a predetermined duration corresponding to the predetermined frequency.
REFERENCES:
patent: 3007024 (1961-10-01), Hensen
patent: 3351739 (1967-11-01), Eckman
patent: 3489882 (1970-01-01), Krackow
patent: 3780261 (1973-12-01), Eaton-Williams
patent: 3937920 (1976-02-01), Gundacker et al.
patent: 3944785 (1976-03-01), Eaton-Williams
patent: 4146775 (1979-03-01), Kirchner et al.
patent: 4196341 (1980-04-01), Williams
Gundacker Siegbert
Howard-Leicester Michael
Moffatt Larry J.
Howard-Leicester Michael
Paschall M. H.
Reynolds B. A.
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