Experiment and analysis of delaying frost of airsource heat pump water chillerheater units by increasing the evaporator area

Explores the influence of increasing the area of the evaporator on the evaporating temperature of the units by experiments. Through analysing the weather data of typical cities in the region where the units are applicable, calculates the frost time of the units with the unchanged evaporator area and that increased by one time respectively for these cities. The results indicate that when the evaporator area doubled, the evaporating temperature can be raised about an average of 25 ℃, and the frost time in different cities can be shortened about 521%~8296% in operating seasons.