Abstract
This study aims to determine the effect of the thickness of the porang tuber chips on the distribution of temperature and humidity in the drying chamber of a hybrid system solar dryer (solar energy-biomass) on the drying rate of porang tubers. The research method is an experimental method in a drying chamber using ultra violet plastic to absorb radiant heat from sunlight and thermal energy from a biomass combustion furnace and then flowing into the drying chamber through a heat exchanger. The results showed that the average temperature in the drying chamber with porang tuber chip thickness of 3 mm, 4 mm and 5 mm, respectively, was 47.030C, 48.740C and 49.730C. The final moisture content of porang tuber chips after drying was 11.74% wb with the highest drying rate of 0.330 kg/hour and 5 hours of drying time at 3 mm thickness. Drying efficiency and drying housing efficiency were respectively obtained at 3 mm chip thickness, namely 17.86% and 6.06%.
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