Heat exchanger and refrigeration cycle device
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United States of America Patent
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Jul 23, 2019
Grant Date -
Aug 2, 2018
app pub date -
Jan 29, 2018
filing date -
Jan 30, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A heat exchanger includes: a heat transfer pipe in which refrigerant flows; and a spiral groove formed at an inner peripheral surface of the heat transfer pipe. A height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is θ, and a length of the heat transfer pipe is L, the inclination angle θ is an acute angle, and a wetted area S×L/cos θ of the heat transfer pipe satisfies S×L/cos θ≥0.5 [m2].
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