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Heat and Mass Transfer Evaluation on Sliced Red Beet (<i>Beta vulgaris L</i>) Dried by Simple Hybrid Dryer

Hanim Z. Amanah, Sri Rahayoe, and Anne I. Amelia
Department of Agriculture and Biosystem Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
Abstract—Simple hybrid dryer is a dryer that combine greenhouse effect and other source of energy such as LPG or biomass. This dryer could increase the drying rate and the visual quality of dried product. The objectives of this research are to evaluate heat and mass transfer of sliced red beet root that dried using simple hybrid dryer by determining the drying rate constant (k) and convective heat transfer coefficient (h). There are two different capasities and three drying methods that applied in this research. The result shows that the convective heat transfer coefficient (h) for hybrid dryer ranging from 4.44 to 14.11 J s-1 m-2°C. The drying rate constants (k) for hybrid dryer ranging from 0.35 to 2.95 s-1, while for dryer by employing greenhouse effect ranging from 0.3 to 3.48 s-1. The k-values for both dryer are slightly higher than k-value of open direct sun dryer that ranging from 0.4 to 1.75 s-1 respectively. Employing greenhouse effect and hybrid dryer resulted in the drying rate higher than by employing direct sun drying.
 
Index Terms—red beet root, hybrid dryer, greenhouse dryer, convective heat transfer coefficient, drying rate constat

Cite: Hanim Z. Amanah, Sri Rahayoe, and Anne I. Amelia, "Heat and Mass Transfer Evaluation on Sliced Red Beet (Beta vulgaris L) Dried by Simple Hybrid Dryer," Journal of Advanced Agricultural Technologies, Vol. 3, No. 4, pp. 265-269, December 2016. Doi: 10.18178/joaat.3.4.265-269
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