| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability of a whole coil with respect to breaking by uniforming stress generated in a bend part of the heat transfer tube coil, and reducing maximum generated stress generated in a bend part center part inner surface side of the heat transfer tube coil. SOLUTION: In the heat transfer tube coil having bent parts of a plurality of heat transfer tubes 1, it is formed such that a bend radius (a radius curvature) of the bend part is not constant in a whole of the bend part. COPYRIGHT: (C)2005,JPO&NCIPI
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