Air source heat pump unit and drying method

Abstract

The invention relates to an air source heat pump unit and a drying method, the air source heat pump unit comprises a surface air cooler, a condenser, a heat exchanger and an evaporator, the heat exchanger comprises an air inlet duct, an air return duct and heat exchange fins, the air inlet duct comprises an air inlet end and an air outlet end, the surface air cooler is connected with the air inlet end, and the condenser is connected with the air outlet end; the air inlet duct and the air return duct are perpendicularly arranged in a crossed mode, the heat exchange pieces separate the air inlet duct from the air return duct, and the evaporator is connected with the air return duct of the heat exchanger. The drying method comprises the following steps: dehumidifying and heating external fresh air and return air; outputting hot air to dry materials; the discharged hot air is recycled and subjected to heat recovery and dehumidification treatment; and according to the humidity comparison result, the exhaust air is exhausted or serves as return air to be recycled along with external fresh air. Compared with the prior art, the heat utilization rate is high, the dehumidification effect is good, energy consumption is low, and the hot air humidity can be kept relatively stable under different environment humidity.

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