| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger with fins for improving a heat exchange capability and frost characteristics and constituted compactly at a low cost. SOLUTION: The heat exchange with the fins comprises a plurality of the fins 11 aligned at a predetermined interval in parallel and distributing an air flow 3 therebetween, and a plurality of heat transfer tubes 13 having the plurality of the fins 11 arranged at a predetermined tube row pitch Pr and tube stage pitch Ps in a direction along the air flow direction through the fins 11 and a direction perpendicular thereto. In this case, the plurality of the tubes 13 having an outer diameter Do of 5.5 mm<=Do<=8.5 mm, and the pitch Pr and the pitch Ps of 3.7<=Ps/Do<=5/4 and 1/3<=Pr/Ps<=1/2. Thus, since a ventilating resistance can be remarkably reduced, the heat exchange capability can be improved, and the frost characteristics can be improved by accelerating a wind speed.
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