The unit uses the company's five core technologies: humidity gradient, uniform air flow in drying room, counter current drying, fully closed independent air duct, and nano electrophoresis anti-corrosion technology for heat exchanger. The comprehensive effect of the five core technologies is remarkable, with low temperature energy saving, small air volume, fast drying, and the highest energy efficiency of the whole unit is more than 4.0. The compressor adopts the scroll compressor of international famous brand for totally enclosed heat pump. The whole machine is of standard modular design with small floor area and flexible installation.