EXPERIMENTAL STUDY OF DOUBLE SLOPE SOLAR STILL WITH ROTATING CYLINDER

Abstract

Solar still is cheap, environmentally friendly and one of best efficient solution of water scarcity and unavailability of drinking water. But major obstacle to their use is limited productivity of conventional solar still. Therefore, objective of this work is to increase productivity of solar still by modifications. Here we create Modified Double Solar Still (MSS) by adding rotating hollow cylinder in Traditional Double Solar Still (TSS). To increase the surface area of evaporation we put rotating cylinder inside the basin. We have filled water as cylinder was partially inside it. At very low speed hollow cylinder has been rotating inside basin. We have performed two experiments, first one for TSS which is without cylinder and second is for MSS which is with cylinder. Cylinder is rotating continuously, during rotation upper part of it in with direct contact with sun light and downward part inside water. Cylinder’s upper portion can absorb heat from direct sun light and when it come downward, it can release heat inside water so that temperature of water rises rapidly and also rate of evaporation of water increase therefore it will become helpful to improve productivity of solar still. From the analysis of both the experiments, it is evident that productivity has increased 57% in MSS compared to TSS.