DEHYDRATION OF AMLA SEGMENTS IN A SOLAR TUNNEL DRYER
Journal Title: International Journal of Agriculture Sciences - Year 2017, Vol 9, Issue 7
Abstract
In this study, a solar tunnel dryer of 6 x 3x 2.7 m (LxWxH) constructed with galvanized frame structure and covered with 200 µ UV-stabilized LDPE sheet. Two fresh air inlets of 0.6 x 0.3 msize and two exhaust fans each of 9’’ diameter and 50 watt capacity were installed at the rear side and front side of the dryer, respectively. The amla segments pre-treated with 2% sodium chloride, 0.1 % potassium meta-bi-sulphite solutions and untreated slices were subjected for drying. Results obtained from this experiment showed that in solar tunnel dryer, the drying required 11-13 h for various pre-treated amla segments to reduce the initial moisture content ranging from 521.46 to 422.32% (dry basis) to final moisture content in the range of 17.39 to 17.01 % (dry basis) and in open yard sun drying, it required 15-18 h for various pre-treated amla segments to reduce from moisture content of 520.13 to 430.13 % (dry basis) to safe storage moisture content of 17.83 to 17.09% (dry basis) at different drying air temperatures and relative humidities. Two drying models were fitted to experimental drying data of amla segments namely Logarithmic model and Henderson-Pabis model and Logarithmic model was found to be the best fit to describe the drying behavior of amla segments. The use of solar tunnel dryer leads to considerable reduction of drying time in comparison to sun drying. The amla segments being dried in the solar tunnel dryer were completely protected from rain, insects and dust.
Authors and Affiliations
U. PRIYANKA .
Keywords
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