Abstract
The performance evaluation of an adjustable and collapsible natural convection solar food dryer, capable of taking 14,688 pieces equivalent to 16.52kg of fresh groundnut with maximum moisture content of 35%, at maximum capacity of 3.39m 2 , and 3,672 pieces equivalent to 4.06kg of groundnut at minimum capacity of 0.8475m 2 , was carried out. The solar food dryer with air vents gap diameter of 10cm was tested at Sokoto Energy Research Centre from 29 th September 2012 to 1 st October 2012. It was used to dry 6kg of groundnut per day for three consecutive days. After drying for about 8 hours each day, it was found that the mass of the groundnut reduced to 4.5kg in the first day, 4.0kg in the second day and 3.5kg in the third day. At the end of the study, the collector's efficiency was 28.3% , dryer's efficiency was 23.0% and the system efficiency was 81.3%, while the drying rate of groundnut was 0.25kg/hr
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