抄録
Recently, frost formation becomes an more important phenomenon not only in the cryogenic equipment but also in the air conditioner equipped with heat pump systems. When heat pump systems are used to supply thermal energy from air for the purpose of space heating in winter, the surface temperature of the evaporator often falls below 0°C and then frost deposition occurs there because it gains heat from the cold outdoor air.
Frost formation cannot be treated easily as a growth of uniform substances such as ice because of the complicated nature of a frost layer. Accordingly, frost formation has been studied from the various points of view. This paper will give a review of studies on frost fomation and defrosting connected with heat pump systems.
