2.6. Estimation of energy consumption
The energy consumption in the single rotary drum dryer was calculated by a digital clamp multimeter (Model: Metravi-107, Metravi Instruments Pvt. Ltd., West Bengal, India). It records the AC/DC voltage in the range of 0.0-599.9 V with a resolution of 0.1 V and current in the range of 0.0-399.0 A with a resolution of 0.1 A. The accuracy was ± 5% for both, AC/DC voltage and current.