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The present paper deals with experiments performed on conventional single slope solar still with various quantities of saline water (20, 30 and 40 kgs). It also deals with experiments conducted in a modified still directly placed on the ground without insulation at its sides and bottom. Furthermore, a modification is made to the still by removing insulation. Heat stored on the earth’s surface is utilised to heat the saline/sea water during the evening. Initially, experiments are performed for 20, 30 and 40 kgs of saline water using a conventional still to get the optimised quantity. There is an increase of 18.5% in the yield when the earth’s heat is used and 28% when 25 mm depth of granite gravel is used in addition to the earth’s heat. The study compares the analytical and experimental cumulative yield for three different saline waters.

Modelling and parametric analysis of conventional solar still using passive control techniques