Exp 5 Discussion Exp rB

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Experiment B: Effect of air velocity with constant air temperature to drying rate

Discussion.

For experiment B, the experiment is conducted at constant temperature but different level of fan speed. The air from the fan passed through the heater to raise its temperature at a certain temperature as the tray drier is operated , which at the end passed uniformly over the tray. When the speed fan changed from 1 to 2, the velocity increased drastically. Consequently, by changing the air velocity will affect the rate of drying and total moisture content in solid. As the total moisture in solid decrease, the residential time will also decrease since the solid surface which interacted with higher air velocity, evaporate more water content. Based on the graph for experiment 2, it shows that higher air velocity which is fan at speed 2, have less moisture content as time increases.Therefore, we can conclude that it have less residential time as it need less time to evaporate moisture from the solid.