| 摘要 |
<p>A heat exchanger tube (2) having medium flow paths (9) through which medium flows in longitudinal direction, comprising a heat transfer expanding part (2a) having no medium flow path located at both ends or one end of the cross-section of the tube, the heat transfer expanding part (2a) further comprising a hole part (10) through which the medium does not flow, wherein the wall thickness of the tube from the outer surface of the tube (2) to the inner surface of the hole part through which the medium does not flow is formed larger than that of the tube from the outer surface of the tube to the inner surface of the medium flow paths.</p> |
