| 摘要 |
PROBLEM TO BE SOLVED: To secure pressure resistance rigidity, and also achieve thinning and material saving.SOLUTION: In heat exchanging flat pipes 41, 42, 43, ..., a plurality of passage holes in which refrigerants flow are formed in parallel with one another. A contour of each passage hole ho comprises a pair of linear lines L1, L2 extending to a second direction, a curved line C1 for connecting one end point P1 of the linear line L1 and an end point P3 of the linear line L2 opposing the point P1, and a curved line C2 for connecting the other end point P2 of the linear line L1 and an end point P4 of the linear line L2 opposing the point P2. The curved line C2 is the same with the curved line C1 in shape. The second direction Z is perpendicular to a first direction X being a parallel direction of the plurality of passage holes ho. When setting a value obtained by non-dimensionalizing a thickness t1 of a partitioning part 160 by dimensions h of the respective linear lines L1 and L2 as t1/h, and setting a value obtained by non-dimensionalizing an external peripheral thickness t2 as t2/h, a relationship of 0.4≤(t2/h)/(t1/h)≤1.5 is satisfied. |
