| 摘要 |
Provided is a fin-tube heat exchanger having excellent heat transfer performance. In order to achieve this performance, the heat transfer performance between air flow and a large number of the stacked fins is enhanced by providing the fins with a special shape to increase the number of ridge lines which are the lines at which surfaces intersect. Each heat transfer fin (20) of a fin-tube heat exchanger has: an undulation section (40) which comprises protrusions and a recess; seat portions (30) which have flat surfaces concentric with fin collars (60) with which heat transfer pipes (50) are joined so as to be in close contact therewith; sloped surfaces (30a) which rise from the seat portions (30) to the undulation section (40); and intermediate protrusions (80) which are disposed in the vicinities of the fin collars (60) and which are formed by protrusion-side ridge lines extending in a line direction in the recess which extends in a tier direction. |
