The heat pump drying system is divided into three types according to the structure type, that is, closed loop type, half open type, and open type. The so-called closed or open type refers to whether the air circuit is open.Send Query Download PDF
Heat source is ambient air. Fresh air is heated by condenser and the drying process is completed
by exhaust the humidity air which heats the material, an open-loop air cycle heat pump dryer.
It is affected by the ambient temperature. Generally, the energy efficiency begins to gradually decrease when the ambient temperature is lower than 15 °C.
Heat source is the released latent heat of wet air. The high temperature and
high humidity air after drying materials is cooled and dehumidified by evaporator, and the latent heat released is absorbed. Then the dehumidified air is heated by condenser to complete the drying process of dry materials, that is, removing moisture from drying materials and dehumidifying wet air process, a closed-loop air cycle heat pump dryer.
The initial temperature of the material is low, and the pre-heating needs to consume auxiliary electric heating heat. In addition, it is basically not affected by the ambient temperature. The energy efficiency is subject to the internal temperature and humidity of the drying room. The greater the humidity is, the faster the moisture removing and the higher the energy efficiency.
Ambient temperature is not less than 15℃
The dry bulb temperature is between 40 to 55℃ and Relative humidity is 50%~95% in the drying room.
Dehumidification drying heat pump dryer(closed-loop)：
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