| 摘要 |
PURPOSE:To improve the heat transfer coefficient of a flat fin and to obtain a compact, high-performance heat exchanger, by penetrating and coupling a plurality of heat transfer pipe groups into a plurality of fins, making the pitch between the heat transfer pipe groups larger than the distance between the neighboring heat transfer pipes, and partially overlapping the heat transfer pipes. CONSTITUTION:Refrigerant is circulated in copper pipes 8a and 8b. The heat is sequentially transferred to a fin collar 9 and a fin 10 from the copper pipe 8. The heat is exchanged with air 11, which flows from the front side. The copper pipes 8 are arranged so that the copper pipe 8b is overlapped partially with a projected plane 12 of the copper pipe 8a on the upstream side as shown in relationship between the copper pipes 8a and 8b. The pitch (b) between the copper pipe groups is larger than the distance (c) between the neighboring copper pipes. Namely, the projected plane of any of the copper pipes 8 on the upstream side is overlapped with the copper pipe on the downstream side. Therefore the distance between the copper pipes forms a slant line with respect to the air stream and becomes larger than the distance in a grid matrix arrangement. Therefore water drops down excellently. The stagnant area of water appears over the approximately entire region on the downstream side of the copper pipes in the grid arrangement. But in this arrangement of the copper pipes, said stagnant area is markedly reduced.
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