A significant reduction in storage temperature can be achieved by ventilation with ambient air. However, the ventilation of the product inside the silo is subject to various limitations: the insufflation of air by means of a normal fan does not allow a punctual control of the humidity with the deterioration of the product caused by the compacting action that the condensed water formed (caused from an insufflation of excessively humid air) exerts on kernels, powders and fungi. The condensation formed would be particularly serious if, in addition to this, the air temperature was higher than that of the cereals. Precisely for this reason, ventilation with air treated by the environment is permitted only under certain atmospheric conditions. Furthermore, the significant reduction in temperature and humidity takes place over a very long time span with very high energy consumption.
