Deep-bed simulation of the cooling of stored grain with ambient air: a test bed for ventilation control strategies
1997
Sun, D.W. | Woods, J.L.
A simulation model for grain cooling is presented and verified against experimental data. The model is applied to grain cooling during a typical season at a location in the southeast of the U.K. Fan control strategies are investigated, and the use of differential control based on the grain to air temperature difference is found to be effective. In the simulation, barley placed in store at 16% w.b. moisture content (0.191 d.b.) and 30 degrees C in late July was cooled to 15 degrees C in 1 month using a 2 degrees C differential, whereas for malting barley it was necessary to use a 6 degrees C differential to reduce rewetting. Rewetting of the bed at the air entry region was significant in all situations simulated and, for malting barley, the heat of absorption significantly affected cooling. The simulations for wheat and barley were very similar. The results indicate that cooling, even during this warm period, can achieve temperatures which will greatly decelerate insect development.
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