Aeration of Agricultural Products
Aeration, that is, forced ventilation of ambient or refrigerated air through stored products is necessary to maintain their quality. The main purpose of aeration is to minimize a risk of storage losses through equalizing temperatures in a bedding in order to minimize moisture movement, to cool product for pest control, and to stop product heating.
Certain biological reactions generate heat and often it is necessary to remove it, that is, to cool the product. Heating and cooling (see Heat Diffusion) large amounts of biological material require energy and time so the knowledge about the process is necessary to optimize operations. Heating or cooling is not an uniform inside the volume of layer of material, rather heating or cooling front passes through the material. The velocity and thickness of the front are dependent on the air velocity (see Air Flux (Resistance) in Plants and Agricultural Products), the evaporation rate, the temperature difference, and the...