Abstract
Longan drying in Loei Province, Thailand. There were two types of dryers with capacity in 5,000 kgs and 10 kgs of type 1 and 2, respectively. The moisture content of longans inside and outside the dryer; type 1 decreased from 80.91% (w.b.) to 20.0%(w.b.), the moisture content of longan samples outside the dryer decreased to 40.0%(w.b.) within 5 days; type 2 decreased from 80.91%(w.b.) to 22.0%(w.b.), the moisture content of longan samples outside the dryer decreased to 45.0% (w.b.) within 5 days respectively. Heat transfer modeling results showed that the moisture content calculated from the model corresponding to the measured values the RMSE=0.5251, 0.4266 and =0.9655, 0.9745. The thermal efficiency of the dryer; type 1 has a thermal efficiency of 8.55%-25.27%; type 2 has a thermal efficiency of 4.42-26.11%.
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