| 摘要 |
A fin-and-tube heat exchanger comprises: fins (31) which each have flat sections (35), first sloped sections (36), and second sloped sections (38); and heat transfer pipes (21). If the distance from the upstream end of the first sloped sections (36) to the downstream end thereof in the direction of air flow is S1, the distance between the centers of the heat transfer pipes (21) in the tier direction is S2, the distance from the upstream ends of the flat sections (35) to the downstream ends thereof in the air flow direction is D1, a flat plane which is in contact, from the side opposite the crest of a ridge (34), with the upstream end and downstream end of the first sloped sections (36) in the air flow direction is a reference flat plane (H1), the angle between the reference flat plane (H1) and each of the first sloped surfaces (36) is &thetas;1, the angle between the reference flat plane (H1) and each of the second sloped sections (38) measured in a region upstream of a through-hole in the air flow direction is &thetas;2, the distance from the reference flat plane (H1) to each of the flat sections (35) is α, and the distance between the reference flat plane (H1) of one fin (31) and the reference flat plane (H1) of another fin (31) adjacent to the crest of the ridge (34) is L, then the range of &thetas;2 is determined by the relationship 0º < &thetas;2 < tan-1[(L±α)/{(S1-D1)/2-L/tan&thetas;1}]. |
