| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat transfer tube having high heat transferring performance while keeping high yield rate and reducing a weight of the tube by effectively utilizing a material. SOLUTION: This heat transfer tube 11 includes a plurality of spiral fins 12 disposed on a tube inner face 10 over the whole periphery of the tube, the fins 12 are respectively composed of a first fin 23 and a second fin 24 having a height lower than that of the first fin 23, the first fin 23 is set at a height H1 within a range of 0.5-1.0 mm, and the second fin 24 is set to a height H2 within a range of 0.1-0.5 times the height H1 of the first fin 23. COPYRIGHT: (C)2009,JPO&INPIT
|
