| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger for achieving both economy and high heat exchange efficiency by solving a problem of uneconomical design in terms of heat exchange performance due to consideration to adverse influence to noise, i.e., to reduction of air-flow speed to low, in a heat-pump-type air- conditioner or the like having plurality of rows of copper pipes of the heat exchanger arranged in the direction of air flow. SOLUTION: In a heat exchanger in a row where a pipe diameter D0 of a copper pipe, a step pitch Pd, and width W in the direction of the air flow of a flat-plate-shaped aluminum fin have been optimized to 7.2<=D0<=8.6 mm, 19.0 mm<=Pd<=25.0 mm, and 27.0 mm<=W<=33.0 mm, respectively, both economy and high heat exchange efficiency are compatible.
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