本文还对热泵干燥、电加热干燥、蒸汽加热干燥的一次能源消耗和能源费用进行了比较和经济评价。
The primary energy consumption and the energy cost of the heat pump dryer are compared with those of electrical heating dryer and steam-heating dryer and their economic evaluations are carried out.
该机工作原理是利用蒸汽或电加热空气，然后由加热的空气对物料进行循环干燥。
Its working principle is to use steam or electricity to heat air, then the heated air will carry out a cycling drying to material.
该机工作原理是利用蒸气或电加热器加热空气，然后由加热的空气对物料进行循环干燥。
Its work principle is that used steam or electric heating air, then made a cycling dry with heated air.
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