Performance analysis of a natural convection grain dryer
1985
Chungu, A.S.
The performance of a natural convection dryer using indirectly heated air was studied with respect to the dryer air temperature, air flow rates and the initial moisture content of the rewetted paddy. The paddy was exposed in thin vertical columns from both sides to drying air which was indirectly heated by a pipe heat exchanger using a rice-husk fired furnace. Development of moisture diffusivity equation for predicting bulk drying of paddy was found to be a function of moisture ratio. This model leads to better predictions than the average moisture diffusivity currently in use. An increase in the drying air temperature resulted in increased moisture removal rates and the influence of high moisture content of paddy on moisture removal rates was minimal. No significant differences were noticed in the head rice yields of the paddy dried under shade and inside the drye0912r up to 60C and above this temperature it resulted in reduced head rice and increased amount of brokens. The performance of heat exchanger was analysed both experimentally and theoretic
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