Liquid heaters and vaporizers – Water tube – Flat
Patent
1986-01-17
1987-04-07
Davis, Jr., Albert W.
Liquid heaters and vaporizers
Water tube
Flat
122134, 165139, 165164, 165170, F22B 2126, F22B 2128
Patent
active
046551743
ABSTRACT:
A hot fluid generator is disclosed for exchanging heat between a first fluid having a first temperature and a second fluid having a second temperature. The generator includes at least two spaced parallel metal sheets spirally wound with spaced turns about a vertical central axis and joined at their top and bottom edges to define a hollow spiral wall. Upper and lower closure members arranged normal to the central axis are connected with opposite ends of the spiral wall to define a first spiral passage between successive spaced turns through which a first fluid is circulated and a second spiral passage between the spaced sheets through which a second fluid is circulated, and a central combustion chamber. A burner is centrally arranged within the combustion chamber to heat the chamber and the first fluid so that as the first and second fluids are circulated, heat is exchanged between the first and second fluids. A drain opening is provided in the lower closure member to remove condensed fluid from the first passage. In a preferred embodiment, the first fluid comprises a gaseous medium which is circulated from the central combustion chamber to an outer circumferential outlet and the second fluid comprises a liquid such as water which is introduced into the first spiral passage at the outermost portion of the spiral wall and is circulated inwardly to the center of the exchanger, whereby the gas and liquid are circulated adjacent one another in opposite directions.
REFERENCES:
patent: 1430924 (1922-10-01), Olson
patent: 1556189 (1925-10-01), Wilson
patent: 2129300 (1938-09-01), Bichowsky
patent: 4203392 (1980-05-01), McLane
patent: 4261299 (1981-04-01), Marran
Davis Jr. Albert W.
Smith Randolph A.
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