Heat exchanger
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United States of America Patent
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Feb 2, 2016
Grant Date -
Feb 16, 2012
app pub date -
Apr 20, 2010
filing date -
Apr 20, 2009
priority date (Note) -
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Abstract
The device relates to a heat exchanger in which heat transfer between heating water passing through the inside of heat exchanging pipes and combustion gas is efficiently performed. The heat exchanger includes a plurality of heat exchanging pipes, through the inside of each of which heating water passes. The cross-section of each of the heat exchanging pipes has protrusions and recessions alternately arranged in the width direction of the heat exchanging pipe, so as to extend the flow path for the combustion gas passing between the heat exchanging pipes.
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