Structure of exhaust pipe for exhaust heat recovery
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United States of America Patent
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Dec 16, 2014
Issued Date -
N/A
app pub date -
Dec 11, 2012
filing date -
Aug 22, 2012
priority date (Note) -
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Abstract
An exhaust pipe heats coolant with heat of exhaust gas. The structure of the exhaust pipe can increase heat exchange efficiency because a flow direction of the coolant is arranged to be opposite to a flow direction of the exhaust gas. The coolant can smoothly flow inside the housing, because density of the coolant decreases as the coolant is heated while flowing in a lower side of the housing and flowing out of an upper side of the housing. In addition, the heat transfer pipe of which one surface is in contact with the exhaust gas and the other side is in contact with the coolant has wrinkle portions which are formed on a surface of the heat transfer pipe, where heat exchange is performed, and thereby, a heat exchange area can be increased and the coolant can be more rapidly heated without increasing a size of the housing.
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