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Experimental investigation of single slope solar still with Eucheuma (agar‐agar) fiber for augmentation of freshwater yield: Thermo‐economic analysis

The accessibility of pure drinking water is one of the most complex challenges that humankind experiencing around the world. In this study, the experimental investigation has been carried out in the single slope solar still by the incorporation of naturally available Eucheuma fiber in the absorber basin. The Eucheuma fiber has high water absorbing capacity and acts like a wick material. The experimental results on two consecutive days in the month of February 2021 shows that the solar still with agar‐agar fiber (SSAAF) has an increase in productivity of 22.06% on Day 1 and 21.05% on Day 2 in comparison with conventional solar still (CSS). The freshwater productivity of SSAAF was 3150 ml/m2/day on Day 1 and 3800 ml/m2/day on Day 2, whereas for CSS it was 2600 and 3100 ml/m2/day on Day 1 and Day 2, respectively. The thermal efficiency was increased by 10% and 13% on Day 1 and 2 for SSAAF. The economic analysis indicates that SSAAF has a payback period of 4.3 months whereas CSS has 5.1 months. The cost per liter of freshwater is about $ 0.026 and $ 0.022 for CSS and SSAAF, respectively.