| 摘要 |
An inner fin arranged in a flat tube has a wave shape constructed by alternately connecting first walls and second walls. The first wall connects two of the second walls in a connecting direction. The first wall has a protrusion with an extending dimension in the connecting direction and a protruding dimension protruding from the first wall. A ratio of the extending dimension to a height dimension of the first wall is defined as a length ratio x/Fh, and a ratio of the protruding dimension to a width dimension of the second wall is defined as a protrusion ratio y/Fw. The ratios x/Fh, y/Fw are set to have values having a predetermined relationship.
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