Electric resistance heating devices – Heating devices – With heat storage means
Patent
1994-06-02
1996-09-03
Jeffery, John A.
Electric resistance heating devices
Heating devices
With heat storage means
392394, 4524, F22B 128, H05B 100
Patent
active
055531873
ABSTRACT:
This invention is for boosting the performance of any existing rockpile-type sauna generator by dividing the rockpile to two parts, the lower part for steam generation and the upper part for steam drying and superheating. The parts are separated from each other by an enclosed space, clear of rocks, which allows water to spread out onto a large area of the rocks at the lower part the rockpile and steam to expand into a large space below the top part of the rockpile and thus to touch a large volume of hot rocks when it rises through the rockpile. Water is transported down to the space above the bottom part of the rockpile without touching the hot rocks at the top of the rockpile, by using bypassers which allow water to run down past the upper part of the rockpile and to spread out over a large area of rocks at lower part of the rockpile. Various types of bypassers are formed by narrow channels and or pipes, embedded into the top part of the rockpile, with funnels or cups at their tops for inserting water, and spouts or distribution tubes at their bottoms for spreading water. A grid, wire-net cage or a similar structure is placed between the rockpile layers to create an enclosed space clear of rocks for water to spread out and for steam to expand.
REFERENCES:
patent: 2512892 (1950-06-01), Forsberg
patent: 3110797 (1963-11-01), Vanne et al.
patent: 3364336 (1966-01-01), Lippo
patent: 3372264 (1968-03-01), Williams
patent: 3400248 (1968-09-01), Isomaa
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