| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fin tube heat exchanger capable of improving heat exchange efficiency.SOLUTION: A fin tube heat exchanger includes a plurality of stacked heat transfer fins 3A; and a heat transfer tube 2 which penetrates the heat transfer fins 3A. Each of the heat transfer fins 3A includes: a base part 4; a cylindrical collar part 5 which rises from the base part 4; and a first enlarged part 7 and a second enlarged part 8 which project outward from a tip of the collar part 5 in the radial direction. Projection length A of the second enlarged part 8 is shorter than projection length B of the first enlarged part 7. Height C from the base part 4 to a tip of the second enlarged part 8 in the height direction of the collar part 5 is higher than height D from the base part 4 to a tip of the first enlarged part 7 in the height direction.</p> |
