Abstract
In this research, the thermodynamic (energy and exergy) analysis of a single slope solar still using graphite plates and block magnets (GPBMSS) was investigated during summer and winter climatic conditions of Coimbatore city (latitude: 11°01'68''N and longitude: 76°95'58''E), in India, 2019. The results observed in GPBMSS were compared with a conventional solar still (CSS) under the same climatic conditions. The outcomes observed that the hourly productivity in GPBMSS was 19.6% and 22.8% higher in summer and winter days, respectively, when compared to CSS. The cumulative productivity in GPBMSS was found to be about 3.93 kg/m2 and 3.56 kg/m2 respectively, for 12 h observations during summer and winter days. Furthermore, the energy and exergy efficiencies of GPBMSS were substantially improved by 20.6% and 18.1% when compared to CSS during summer days. Similarly, the energy and exergy efficiencies of GPBMSS were increased by 18 and 19% compared to CSS in winter days. In addition, the maximum basin exergy destruction was observed in CSS compared to other solar still components. The results observed that the heat storage ability of the graphite plates and water magnetization in GPBMSS greatly decreased the exergy destructions. Finally, the water quality analysis proved that the distillate collected from both GPBMSS and CSS satisfied the requirements recommended by the Bureau of Indian Standards.
Highlights
In this world, pure water is a fundamental necessity for humans
Erfan et al ( ) improved the exergy efficiencies of PV/T collector and PCM assisted double slope solar still by 27 and 2%, respectively, during summer and winter climatic conditions. They reported that the proposed model has improved productivity of about 10.6% compared to conventional solar still (CSS)
It was observed that the graphite plates and block magnet temperatures increased in noon hours and reached 70.2 C and 68.5 C, respectively during summer days
Summary
Pure water is a fundamental necessity for humans. The increase in industrialization rapidly increases the pure water demand. Dumka & Mishra ( ) found a thermodynamic performance improvement in CSS by adding various earth heat storage materials They reported that the coal powder solar still covered with polythene increased the energy and exergy efficiencies by 5.06 and 76%, respectively, compared to CSS with simple earth oil. Erfan et al ( ) improved the exergy efficiencies of PV/T collector and PCM assisted double slope solar still by 27 and 2%, respectively, during summer and winter climatic conditions They reported that the proposed model has improved productivity of about 10.6% compared to CSS. Dumka et al ( b) used ferrite ring magnets in a solar still basin and reported that the improvements in productivity were 49.2% higher than for CSS They reported that the improved energy and exergy performance was observed as 49.1% and 110.2%, respectively. The water quality parameters of the obtained distillate were checked and compared with BIS
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