Global Journal of Researches in Engineering, A: Mechanical & Mechanics, Volume 22 Issue 1

Figure 4: Presents comparisons between variations of hourly productivity of modified stepped solar still, stepped solar still without modification and conventional solar still 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 07:00:00 08:00:00 09:00:00 10:00:00 11:00:00 12:00:00 01:00:00 02:00:00 03:00:00 04:00:00 05:00:00 06:00:00 07:00:00 Mewmodified still Mew conventional still Productivity (ml/m²h) Time (hours) Performance of a Modified Stepped Solar Still © 2022 Global Journals Global Journal of Researches in Engineering (A ) Volume XxXII Issue I Version I 16 Year 2022 The hourly productivity is seen to increase dramatically during sunshine hours when the stepped solar still modified is used. The maximum values of hourly productivity of modified stepped solar still and conventional solar still are found to be 1.158 and 0.541 (kg/m²h) respectively. Therefore, the corresponding daily productivities are obtained as 9.9 and 4.3 (kg/m² d) respectively. It is seen that the daily productivity of the modified stepped solar still is higher than that of conventional solar still by 103%. IV. C onclusion For augmenting the evaporation rate, a transient mathematical model was presented for a modified stepped solar still, and a conventional solar still which could maintain minimum depth in the basin. The performance of a modified stepped solar still was investigated and compared with a conventional solar still. The results show that the thermal performance of a modified stepped solar still can be considerably improved through the new modification the corresponding daily productivities are obtained as 9.9 and 4.3 (kg/m² d). The production rate of the modified stepped solar still is higher than that of conventional solar still by 103%. R eferences R éférences R eferencias 1. El-Sebaii, A.A., Al-Ghamdi, A.A., Al-Hazmi, F.S., Faidah, A.S. Thermal performance of a single basin solar still with PCM as a storage medium. Applied Energy 2009. 86: p. 1187–1195. and external reflectors. Solar Energy 2011. 85:p. 217–233. 3. Abdel-Rehima Z.S and Lasheen. Improving the performance of solar desalination systems, Renew . Energy 2005. 30:p.1955–1971. 4. Nafey A.S, M. Abdelkader, A. Abdelmotalip, A.A. Mabrouk, Solar still productivity enhancement , Energy Convers. Manage.2001. 42:p. 1401–1408. 5. Naim M.M, and Abd El Kawi M.A. Nonconventional solar stills Part 2. Non-conventional solar stills with charcoal particles as absorber medium . Desalination. 2002:p. (2002) 71–80. 6. Bassam A.K and Himzeh A. Experimental study of a solar still with sponge cubes in basin. Energy Convers. Manage.2003. 44:p. 1411–1418. 7. Velmurugan V, S. Senthil Kumaran, V. Niranjan Prabhu, and K. Srithar. Productivity enhancement of stepped solar still – performance analysis. Thermal science .2008.12:P. 153-163. 8. Velmurugan V, S. Pandiarajan, P. Guruparan,H. Subramanian, D. Prabaharan, K. Srithar, Integrated performance of stepped and single basin solar stills with mini solar pond Desalination.2009a.249:P. 902–909. 9. Velmurugan V, J. Mandlin, B. Stalin and K. Zrithar, Augmentation of saline streams in solar stills integrating with a mini solar pond. Desalination.2009.249:p.143–149. 2. Madhlopa A and Johnstone C. M. Computation of solar radiation distribution in a solar still with internal 10. Tabrizi F.F, M. Dashtban and H. Moghaddam. Experimental investigation of a weir-type cascade solar still with built-in latent heat thermal energy storage system , Desalination. 2010. 260:p. 248–253.