Heat pump dryer is the heat pump to get high temperature. The compressor makes the coolant as high temp. and high pressure gas, it releases the heating energy and becomes liquid when pass the condenser with the fan running, this heating energy goes to raise up the air temperature at the drying room. The water inside of the goods to be dried becomes steam by the hot air, and this steam is taken away by the exhaust system, the goods will be tried by doing that again and again. We have the heating-reuse system to heat up the refresh air from outside, that can save energy of preheating the fresh air about 60% - 70%.