Abstract
By using simple mass and energy balances, the cooling and drying characteristics of a ventilated or barn dried hay stack have been analysed. The results of this approach could be verified with measurements in cylindrical hay stacks (air entrance along the centre axis of the stack). The resistance of the air flow through the hay stack could be described with the ERGUN-correlation which has been used extensively in chemical engineering literature to describe the flow behaviour in packed columns. The bulk density of the hay plays an important role in the air flow through the bed, and in the cooling and drying processes. A relationship is evaluated which predicts the bulk density of the hay as a function of the height of the stack. This relationship was verified experimentally with our own modified haystack, as well as with two conventional haystacks. With this knowledge it may be concluded that the non-uniform drying profile which occurs in a hay stack with a conventional cylindrical air duct can be prevented by using a conical duct.
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