HEAT EXCHANGER AND REFRIGERATING CYCLE DEVICE PROVIDED WITH SAME

摘要

In an outdoor machine in a cold district and an indoor machine of a refrigerator, a heat exchanger acting as an evaporator is cooled to an air dew-point temperature or below. When the temperature is 0ºC or below, frost is formed on the surface of the heat exchanger. The frost formation causes an increase in air duct resistance and heat resistance, and leads to the lowering of the performance of the device. However, if the frost formation is delayed, energy can be saved. Therefore, a plurality of holes such as a plurality of holes with a radius of several nano-orders are formed in the surfaces of the fins of the heat exchanger to suppress the occurrence of condensed water droplets produced on the surfaces of the fins. Also, a plurality of holes for causing the Gibbs-Thomson effect are formed to lower the freezing point for delaying the lowering of the performance due to frost formation.