Importance

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Abstract

The present invention discloses a heat exchanger fin having three rows of slit parts being arranged at the air inlet side and another three rows at the air outlet side relative to the centerline of heat transfer pipes 102, in order to reduce the ventilating resistance, prevent the growth of a boundary layer and reduce a dead zone on the downstream of the heat transfer pipes 102 to thus increase heat transfer performance. The outer slit parts 111 and 111'; and 116 and 116' at the air inlet side and at the air outlet side are formed in pairs. The middle slit parts 112 and 112' at the air inlet side are formed in pairs and the middle slit part 114 at the air outlet side is formed in a unit. The inner slit parts 113 and 114 at the air inlet side and at the air outlet side are also formed in a unit. Therefore, the heat exchanger can reduce the airflow pressure drop and thus can increase air volume, and can improve the evaporation performance by increasing the heat transfer rate between the air and the fin surface.

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First Claim