As a commodity with high adaptability to climate change, sorghum has high potency in food sustainability. Sorghum grain can be diversified to be various kinds of food products including rice sorghum instant. The heat transfer process during the drying of sorghum rice instant is an interesting factor to be evaluated that influences the physical properties of sorghum rice. This research is aimed to analyze and compare the heat transfer in sun drying and cabinet drying in the production of sorghum rice instant. The heat transfer has been approached by the lumped-capacitance model with the case of a spherical particle. The heat transfer in the drying process was conducted in the heat capacity of 3.61 kJ/kg℃ to 3.843 kJ/kg℃, the particle dimension of rice of 0.38 m² to 0.42 m², and the rice density of 1.11 g/mL to 1.17 g/mL. The heat transfer coefficient during sun drying is 1.24 W/m². ℃, while in the cabinet drying at the temperature of 60 ℃, 50 ℃, and 40 ℃ were 12.17 W/m².°C; 9.55 W/m².°C; and 4.87 W/m².°C respectively, influenced by the drying temperature. The drying temperature influenced the heat transfer and the color change in sorghum rice instant caused by the Maillard reaction with the activation energy of 26.28 kJ/mol.
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