Water heating tank with thermosiphonic circulation for improved heat recovery rate
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United States of America Patent
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Apr 9, 2002
Issued Date -
N/A
app pub date -
Apr 2, 1999
filing date -
Oct 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electric water heater has a vertically disposed tank with a cold water inlet, a hot water outlet and at least one horizontally disposed elongated immersion heating element extending into the region of the tank between an upper region and a lower region. Each heating element is surrounded by an elongated closed end tubular sleeve having a plurality of lower openings distributed along the length of the sleeve below the heating element therein and a plurality of upper opening distributed along the length of the sleeve above the heating element. The total area of the upper openings is greater than the area of the lower openings to generate upon operation of the heating element an upwardly directed transverse flow of water in a direction from the lower openings to the upper openings along the entire length of the sleeve. A thermosiphon bypass check valve connected between the cold water inlet and the hot water outlet having a bypass conduit with one or more constrictions and a closure member. The operation of the bypass check valve along with the sleeve surrounding each element generates a thermosiphon effect which improves heat transfer to the water in the tank and thus the heat recovery rate.
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