The paper introduces the difference of heat pump drying and heat air drying,the drying system of the former is the closed cycle of moisture air and it is dehumidified by refrigeration.

• 热泵与常规热风干燥的区别在于前者的干燥系统中空气为闭式循环,依靠制冷原理对空气降温;后者为开式循环,依靠换气使空气降湿。