| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure a sufficient refrigerant flow rate, while ensuring a sufficient pressure-resistant strength against to the internal pressure of flow path holes. <P>SOLUTION: A flat heat transfer tube 41, 42, 43, ... is formed by arranging, in a flat tube body 141, 142, 143, ..., flow path holes ho each having a rectangular cross section in the long axis direction X of the cross section of the flat tube body 141, 142, 143, .... The value obtained by turning the thickness t1 of a partition part 160 between the flow path holes ho by a first width h of the flow path hole ho dimensionless is taken as t1/h, and the value obtained by turning an outer peripheral thickness t2 that is the thickness from the outer periphery of the flat tube body 141, 142, 143, ... to the flow path hole ho by the first width h dimensionless is taken as t2/h. When the ratio between a second width w of the flow path hole ho along the long axis direction X and the first width h, that is, the aspect ratio w/h is 0.4≤(w/h)≤1.5, and the internal pressure P of the flow path hole ho is 10.0 MPa≤P≤40.0 MPa, the relationship of 0.35≤(t2/h)/(t1/h)≤1.45 is established. <P>COPYRIGHT: (C)2013,JPO&INPIT |
