A small scale, forced convection, solar-biomass hybrid dryer for drying copra has been designed, fabricated and tested for drying copra. The dryer is consisted with a solar air heater, a biomass-stove heat exchanger and a drying chamber. The biomass consumption of the dryer was found to be reduced by more than 60% when the solar air heater was in operation. The reduction of moisture content of copra from 50% to 7% was recorded after 32, 35 and 37 hours at drying temperatures of 72°C, 60°C and 55°C, respectively. The highest percentages of brown copra (13.33%) and low grade copra (1.67%) were recorded at 72°C and the remaining copra was either white or light brown. More than 75% of white copra could be produced by maintaining the drying temperatures below 60°C. Colorless coconut oil with good quality could be extracted mechanically by using both white copra and light brown copra obtained from hybrid drying
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.