| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger in which heat exchange efficiency is improved by increasing a surface area by grooves formed on a surface of a flat tube and generating a turbulent flow, and which has an excellent bondability with a fin. <P>SOLUTION: The plurality of grooves 14 are formed extending while meandering along a flat surface in the longitudinal direction, projection parts are formed at a part of an internal flow path 13 by the grooves 14, and a plane part excluding the grooves 14 on the flat surface is formed so as to have an occupancy ratio to the flat surface 40% or more and 95% or less in any width direction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
