Heat exchanger and water heater
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United States of America Patent
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Sep 30, 2008
Grant Date -
Sep 27, 2007
app pub date -
May 10, 2005
filing date -
May 11, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heat exchanger A1 includes a coiled tube 60 including a plurality of loops 60a, and a space 35 surrounded by the coiled tube 60 and having an end closed by a partition 19. The heat exchanger is so designed that combustion gas flows from the space 35 to a combustion gas path 36 by passing through clearances 61 of the loops 60a of the coiled tube 60. The loops 60a are made of a tube having a thickness t1 and a width L1 which is larger than the thickness, so that the amount of heat recovery when the combustion gas passes through the clearances 61 is large. Therefore, the heat exchange efficiency is enhanced while simplifying the overall structure of the heat exchanger A1 and reducing the size of the heat exchanger.
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