| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve heat exchange performance of a heat exchanger having a plurality of rows of heat transfer pipes.SOLUTION: In a heat exchanger in which a plurality of slit-type cut-and raised parts 4 are provided in a fin 2, when a fin interval is defined as s and fin plate thickness is defined as t, height h1 of a plurality of cut-and-raised parts 4a between heat transfer pipes 3a on the most airflow upstream side out of the plurality of cut-and-raised parts between a large number of heat transfer pipes is made to be within the range of 0.41(s+t)≤h1≤0.59(s+t), and height h of the plurality of cut-and-raised parts 4b between the heat transfer pipes 3b on the second and subsequent rows from the airflow upstream side is made to be within the range of h<0.41(s+t) or h>0.59(s+t). Thereby, ventilation resistance can be lowered while maintaining heat transfer performance on the air side by the slit-type cut-and-raised parts 4 (4a and 4b) highest, and heat exchange performance can be improved.</p> |
