DOUBLE PIPE HEAT EXCHANGER AND REFRIGERATION CYCLE DEVICE
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Sep 3, 2013
filing date -
Oct 2, 2012
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Abstract
A double pipe heat exchanger includes an inner pipe inside which a first fluid passes, an outer pipe that has a diameter larger than the diameter of the inner pipe and that covers the inner pipe, and second fluid passes through a space between the outer pipe and the inner pipe, and a heat transfer area enlargement pipe that is provided in the space and that has a projection-depression shape made to be larger than a length in the pipe-circumferential direction of outer contact portions to be contact areas with the inner wall of the outer pipe, and fin portions between the outer contact portion and the inner contact portion that traverse the space in a pipe cross section come into contact with the outer wall of the inner pipe and the inner wall of the outer pipe in oblique directions.
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