Experimental investigation on Solar desalination system integrated with kanche marbles

Engineering notes

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Chinese explanation / 中文解读

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Original abstract

Water scarcity has been identified as one of the major challenges in the world today, thereby the necessity of developing simple and sustainable desalination technologies. The performance of this Modified Solar Still (MSS) using black-coated glass (kanche) marbles as sensible heat storage medium was experimentally compared with that of Conventional Solar Still (CSS) under climatic conditions of Somnath, Gujarat, India. The two identical, single-slope solar stills were operated in parallel with a basin area of 1 m². The MSS had higher water and glass cover temperatures in the basin throughout the day, which led to higher evaporation and condensation rates. The maximum distillate yield per hour for the MSS was 0.58L whereas the CSS yields 0.49L. Likewise, the amount of cumulative freshwater produced rose from 3.1 L/day in the CSS to 4.0 L/day in the MSS. The highest thermal efficiency of the MSS was 36.5% and for CSS it was 32%. The performance is enhanced due to better absorption and retention of solar energy by the black coated marbles and the MSS is a practical and economical solution for solar desalination applications, the main reason for this is attributed to the solar energy absorption and heat retention properties of kanche marbles.

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