Experimental evaluation of conventional solar still (CSS) and CSS with sand-filled glass bottles (Modified solar still (MSS)) have been reported in this article. Two identical CSS were fabricated for the experiments. The experiments were designed and performed under Guna (India) weather conditions in November 2021. Sand-filled glass bottles were paced as sensible energy-storing material. The mathematical model proposed by Kumar and Tiwari has been utilized to evaluate internal heat transfers, internal efficiency, and exergy efficiency. For checking the economic feasibility of sand-filled glass bottle within CSS, a comparative cost analysis has been performed to evaluate CPL (Cost per Litre). It has been observed that the MSS has yielded 21.32% more than CSS. And overall internal efficiency has also increased by 139.45% due to the presence of sand-filled glass bottles.

Experimental and theoretical impact of the coco peat powder on the performance of conventional solar still (CSS) compared to MSS has been reported. Dunkle model was used in this experiment as the mathematical model. With the help of this model variation of partial pressure, internal heat transfer coefficients, yield, internal efficiency, and exergy efficiency has been evaluated. The average partial pressure for MSS is 94.19% higher than CSS in the experiment of 13 h. Use of coco peat powder the value of h?? and h?? were 9.63% and 2.53% respectively were recorded higher than the CSS. There was a rise of 30.89% of distillate output from the MSS when compared to CSS. It seems that the use of coco peat powder has enhanced the exergy efficiency by 28.14% of MSS when compared with CSS.

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