High efficiency and energy saving. The heat of the heated air in the heat pump dryer mainly comes from the sensible heat and latent heat contained in the warm and humid air discharged from the recovery drying chamber, and the energy needed to be input is only the work consumption of the heat pump compressor, and the advantage of the heat pump is that it generates a lot of heat with a small amount of work, so the SMER of the heat pump dryer is usually 1.0 ~ 4.0 kg/kwh, while that of the traditional convection dryer is about 0.2 ~ 0.6 kg/kwh. Temperature and humidity are easy to control. When the material requires high temperature and humidity of the air entering the drying chamber, the material's texture and appearance requirements can be met by adjusting the evaporation temperature and condensation temperature of the working substance in the evaporator and condenser. Useful volatile components in recyclable materials. Some materials contain volatile components. When a heat pump is used for drying, volatile components and moisture are vaporized into the air in the drying room. When the air containing volatile components is cooled by the evaporator, the volatile components are liquefied and discharged together with the condensed water. Collect the condensed water containing volatile components, and separate the useful volatile components by appropriate methods.
Environmental protection. The drying medium in the heat pump drying device is closed and circulated, and there is no pollution to the environment caused by the discharge of material dust, volatile substances and odor with the drying waste gas; The residual heat in the exhaust air of the drying room is directly recovered by the heat pump to heat the cold and dry air, and the unit has no thermal pollution to the environment. Can realize multi-functions. The heat pump in the heat pump drying device also has refrigeration function, which can be used to realize low-temperature processing or preservation of various materials in the season with less drying tasks, and can also expand the heating function of the heat pump to provide heat for planting or breeding places in cold seasons.