An Experimental Approach to Increase Efficiency of Modified Solar Still and Comparison between Conventional, Modified and Modified Solar Still using Iron as Heat Storage Medium

The existing desalination system works on the electricity, high grade on non-conventional energy like gases, fossil fuel & coal. While the extraction of thermal energy from these fuels, carbon footprint residues occurs, this may cause increase in greenhouse gases in environment, ozone layer depletion and many health hazards on mankind. It may also cause global warming which is a major threat & burning topic to the sustainability of life. The harming of solar energy is most efficient & less sophisticated opportunity towards the green technology. The desalination using solar energy is one time investment for lifetime production of pure water up to 15 to 25 years. In this dissertation, multiple method of desalination has been discussed. The productivity of passive solar stills can be improved or enhanced by using various storage materials or by some simple modification in the design of still. These solar still can be used to convert brackish water into fresh water. Conventional solar stills has low productivity and productivity of solar still many research iterate and puts their effort consistently. Many researches have used metal particles of Nano sized to improve the thermal efficiency of the still. In this project, conventional and modified solar stills are used for the performance analysis, results were carried out with depth of water and graphs were plotted. In terms of yield, maximum conversion of water is obtained from double slope single basin passive solar still with iron as storage material with 839ml of pure water at 1 cm depth of saline water, which is in comparison 39.68% more than the non-conventional & 46.67% more than the conventional solar still with only saline water. The efficiency goes maximum by 15.52% using iron pieces at 6 PM and 3 cm of saline water, on using conventional still with saline water at 1cm it gives 10.17% at 1 PM & it gets 10.37% when non-conventional solar still is used with only saline water at 2 PM. In terms of efficiency, it is observed that the overall maximum efficiency is obtained by using iron is 15.52% which is 54.27% higher than the yield of conventional still using water and 33.9% more than the non-conventional still with saline water.