Dehumidification heat pump = combination of dehumidification  (drying) + heat pump (energy recovery)，which is a device that is  to make humid air cool and dehumidify by refrigeration system  while recovering moisture through heat pump principle to  condense latent heat to heat the air. Heat source = The phase  change of water vapor in the air releases condensation heat.  Closed drying at low temperature (7-75℃), and energy recycling  during the drying process.
Air flow: heating by hot air in the drying room, the material  absorbs heat and water vaporizes, the air absorbs moisture into  hot and humid air → enters the evaporator, the air is cooled to  below the dew point temperature, the water vapor condenses  and releases the latent heat of condensation → enters the air  condenser to absorb the refrigerant and release it during  condensation Heat heating air → main fan → drying room.

Refrigerant process: The low-pressure refrigerant liquid is  vaporized by the evaporator to absorb the air and release heat  to vaporize into low-pressure superheated gas → enter the  compressor → low-pressure superheated refrigerant gas passes  through the compressor isentropic compression to work to  high-grade, high-temperature and high-pressure gas → enters  the wind condenser to release the latent heat of condensation  into a high pressure liquid→expansion valve, after decompression to low temperature and low pressure liquid→evaporator.