To study a drying of Eucalyptus shell by using fluidized bed. The variables such as temperature range of 80-100 ํC, hot air velocities 2.32-3.85 m/s and height of bed of 3.5-9.5 cm. in batch process whereas temperature range of 90-110 ํC and hot air velocities of 2.32-2.85 m/s in continuous process were investigated. The initial moisture content about 55-60% by weight being decreased to 10% by weight was criteria for determination the optimum condition. Experimental results for the optimum condition in batch process was 9.5 cm of height of bed, 2.32 m/s of hot air velocity and 80 ํC of bed temperature, while the optimum condition in continous process was 90 ํC of bed temperature and 2.85 m/s hot air velocity. These optimum conditions give high energy efficiency and obtain 10% moisture content of shell. Mathematical model shows the prediction very well in both batch and continuous process for all experiments at low height of bed, except the height of bed at 9.5 cm in batch process having large deviationbecause of not being uniform contact between hot air and raw material.
