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Experimental Performance of a Mix Mode Solar Dryer for Drying Centella Asiatica
Abstract:
This paper describes a mixed mode natural convection of solar dryer. The dryer was designed for small-scale commercial producers of agricultural products in non-electrified locations. The products to be dried are placed in multi layer on a wire mesh in the drying tunnel to receive energy from both hot air supplied from the collector and incident solar radiation on products. Temperatures in the drying chamber varied from 28.0° C to 55.0° C depend on the weather conditions. To investigate its performance, the dryer was used to dry 30 kg of Centella asiatica in December 2012. The dryer could be used for Centella asiatica of 80% (wb) moisture content, and they could be dried within 4 hours, with 0% (wb) remaining moisture. In addition, the Centella asiatica being dried in the solar tunnel drier were completely protected from rain, insects and dust, and the dried Centella asiatica were high quality dried products terms of flavor, color and texture. The drying efficiency of the solar component alone was found to be 39.18%.
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Pages:
80-83
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September 2013
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