An Experimental Studyon Mixed Mode Solar Dryer with Heat Storage Materials
Solar drying is one of the important techniques which are drawing more attention in the recent years. The use of solar dryer helps to preserve the product for a longer time. The present paper focuses on the development of such a technique. In this study, a mixed mode solar dryer with heat storage materials (Pebbles) is developed. 4 kg chillies were used as drying product and experiments were conducted for the metrological conditions of Ujire, Karnataka, India. Design and fabrication of the developed drying system is explained in this paper. The analysis is carried out for its performance is also focused. The obtained results are discussed in detail. Air flow rate maintained was 4 m/s, maximum drying rate obtained was 5.5 grams/min and 4.78 grams /min for upper and lower tray. The results indicate that the upper tray showed better performance than lower tray. Maximum value of overall thermal efficiency of developed drying system was 36.69 %. Use of heat storage materials increases the temperature of incoming atmospheric air so that relative humidity decreases and this increases moisture extraction ability of air. Use heat storage materials also helps to sustain the sudden variation in air temperature at inlet of the dryer cabin.
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