| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the generation of noise due to ventilating resistance and to enhance the heat transfer efficiency by forming raised tab pieces on both the front and rear surfaces of a fin base surface, and forming raised tab pieces lower in height than those of the raised tab pieces of both the front and rear surfaces in the other plurality of rows. SOLUTION: Fins are formed so that two rows of raised tab pieces 31a' to 31b', 32', 33', 34', 35a' to 35b', 35a' to 35c' and 31a to 31b, 32, 33, 34, 35a to 35b, 36a to 36c are perpendicular to the air flowing direction indicated by arrows A and B. The raised tab piece groups are alternately formed on both front and rear sides with respect to the fin base surface 30. The groups lower in height than the groups formed at an air flow outlet side are formed at the air flow inlet side row for generating much condensate by a refrigerant circuit. Thus, the decrease in the heat transfer efficiency due to the condensate is prevented, the ventilating resistance is reduced to make is possible to decrease the noise. Further, the heat exchange performance is improved by the boundary layer front edge effect.</p> |
