| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchange pipe with an inner surface structure satisfying the following conditions in the most, namely, to provide the heat exchange pipe being superior to the conventional art in the both of condensation and evaporation, having an improved heat transfer efficiency, reducing a pressure a little and the weight of the pipe as much as possible, and satisfying a low production cost by a little number of steps engraved in the structure. SOLUTION: This heat exchange pipe with a rib in its inner surface is so formed that the inner surface is circumferentially divided into, at least, two zones (Z<SB>1</SB>, Z<SB>2</SB>,..., and Z<SB>n</SB>) and the zone can be divided into, at least, two zone classes (K<SB>1</SB>, K<SB>2</SB>,..., K<SB>j</SB>, K<SB>j+1</SB>..., and K<SB>m</SB>). At least, in a zone in a single zone class (K<SB>1</SB>, K<SB>2</SB>,..., K<SB>j</SB>), the rib 1 extends at the rib height of h<SB>1</SB>in the pipe longitudinal direction at a lead angleα<SB>1</SB>. At least, in a zone in another zone class (K<SB>j+1</SB>, K<SB>j+2</SB>,..., and K<SB>m</SB>), the rib 1 extends at the rib height of h<SB>2</SB>in the pipe longitudinal direction at a lead angleα<SB>2</SB>and the rib 2 crosses with a rib 3 of the rib height of h<SB>3</SB>extending at a lead angleα<SB>3</SB>(α<SB>3</SB>unequal toα<SB>2</SB>). COPYRIGHT: (C)2003,JPO
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