The sensible heat factor decreases with the increase of ventilation time after the rock surface is exposed due to the decrease of the surface temperature of the rock.
通风开始后，壁面温度随着暴露时间的增长而降低，显热比也随通风时间增长而降低。
Higher temperature, oil temperature increase, decrease viscosity, steam increased, the limit will cause a vacuum up, we should strengthen the ventilation cooling.
环境温度较高时，油温升高，粘度下降，饱和蒸汽增大，会引起极限真空上升，应加强通风散热。
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