LATENT HEAT RECOVERY TYPE WATER HEATER
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United States of America Patent
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Issued Date -
Mar 6, 2014
app pub date -
Aug 27, 2013
filing date -
Aug 31, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A latent heat recovery type water heater A being designed such that water flown in a secondary heat exchanger 2 is heated, and the heated water is supplied to a primary heat exchanger 1 and is further heated. A controller 4 compares heat exchange efficiency η of the secondary heat exchanger 2 with a predetermined threshold value Th, and the controller 4 determines whether the primary heat exchanger 1 is in a normal condition or not. The threshold value Th is changed corresponding to temperature of inflow water to the secondary heat exchanger 2. Accordingly, an abnormality such as scale adherence in the primary heat exchanger 1 is accurately detected regardless of the fact that the primary heat exchanger 1 and the secondary heat exchanger 2 are connected by a bypass path or not.
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