Experiments on defrosting control based on exhaust fan current combined with evaporation temperature

Tests the operation status of an aircooled heat pump air conditioner under defrosting conditions, and records the evaporation temperature and exhaust fan current at different voltages. The results show that the exhaust fan current increases with frosting enhancement, while the increasing speed gets slower in the end of frosting, and the curves of current are slightly different at different voltages; that the evaporation temperature decreases with frosting enhancement, and the decreasing speed becomes increasingly faster; and that misoperation of defrosting can be avoided by using the intelligent defrosting control method based on exhaust fan current combined with evaporation temperature presented according to the experimental results.