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Preheating is the first step before drying most materials, because usually, the temperature of heat pump drying is higher than the ambient temperature, especially in low temperature or northern areas, preheating is more important. In the preheating stage, due to the low initial temperature of the drying room and less evaporation of material moisture, the humidity is relatively low. Generally, only heating is used without moisture removal, so as to ensure that the materials can be heated rapidly to achieve the internal and external temperature balance of materials. The greater the air humidity, the higher the enthalpy value, and the better the heat conduction effect.
預(yù)熱時間長短需要根據(jù)保定平面設(shè)計培訓(xùn) 保定空調(diào)維修 保定管道通風(fēng) 包裝盒定做 化糞池模具 廢舊電纜回收 不銹鋼鑄件 物料屬性、物料數(shù)量和環(huán)境溫度來確定