Article ID: 18-29AC_OA
To achieve a good heat transfer performance for heat pump type air conditioners, the outdoor units of the air conditioners need to perform well under both the frosting and the non-frosting conditions. This paper proposes a perforated fin whose perforated structure is capable to enhance the heat transfer and to avoid the frost blockage. The perforate position on the fin surface is figured out by analyzing the positions of the frost blockage zone and the water exclusion zone. The optimal perforated geometries are designed to enhance the heat transfer coefficient. The new designed perforated fin has two parallels of rectangle multi-perforated holes. The experimental results show that the heat transfer capacities under the non-frosting condition and the frosting condition of the designed perforated fin are 4.6% and 1.1% higher than these of wavy fins, respectively. The perforated structure has the capability to avoid the frost blockage around the enhanced structure on the fin surface.
