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机械通风时机的选择,直接影响通风效果。采取科学的方法选择合理的通风时机,是十分重要的。无论是通风降温还是降水,都要求粮食不增湿。常用的方法是:假设粮温不变,将外界空气引入粮堆后,其相对湿度发生变化,通过与粮食水分对应的平衡相对湿度进行比较从而决定通风的可能性。如果以高于粮温的空气引入粮堆,则进入粮堆后的空气温度将会下降,其相对湿度将增加,在粮温基本不变时,相对湿度增加,粮食的平衡水分也会增加。这就是说,一
Mechanical ventilation timing of choice, a direct impact on the ventilation effect. It is very important to adopt a scientific approach to choose a reasonable timing for ventilation. Whether ventilation or precipitation, require food does not humidification. Commonly used method is: Assuming constant grain temperature, the outside air into the grain piles, the relative humidity changes, through the corresponding relative humidity and food moisture to determine the possibility of ventilation. If the air is introduced into the grain pens at a temperature higher than the grain temperature, the temperature of the air entering the grain pens will decrease and the relative humidity will increase. When the food temperature is substantially unchanged, the relative humidity increases and the equilibrium moisture content of the grain increases. That is to say, one