| 摘要 |
In the present invention, a fin for heat exchange is attached to the outer surface of a tube (1), and the fin promotes heat exchange with the tube (1) and air that flows around the tube (1). A cross-sectional shape that is orthogonal to the flow direction of the air is a wave shape having a plurality of flat sections (21) which are substantially parallel to the flow direction of the air, and apex sections (22) which link adjacent flat sections (21). In the flat sections (21), a plurality of louvers (23) are cut and raised at a cut-and-raise angle determined beforehand with respect to the flat sections (21), and are provided along a flow direction (X1) of air. When the plate thickness of the flat sections (21) is t and the louver pitch of the louvers (23) is PL, the plate thickness of the flat sections (21) and the louver pitch satisfy the relationship 0.035≤t/PL≤0.29. Due to this configuration, heat transfer performance can be improved. |
