PERFORMANCE OF A PYRAMID SOLAR STILL USING AIR-COOLED GLASS COVER: AN EXPERIMENTAL STUDY | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 20, Volume 35, Issue 1, January 2018, Page 359-376 PDF (1.41 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2018.96205 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| M. A. Tawfk | ||||
| Assistant. Prof., Agric. Eng. Dept., Fac. of Agric., Zagazig Univ., Egypt. | ||||
| Abstract | ||||
| Cooling the glass cover is considered one of the most effective modifications that affecting the performance of any solar still, particularly at summer season. Many previous studies focused on the water cooling glass cover, but it is important to study another cooling technique to avoid using potable or saline water in this process. Thus, this study aims toinvestigate the possibility of enhancing the performance of a passive square pyramid-shaped solar still in summer season through cooling the glass cover using controlled stream of cooled air. For this purpose, the solar still was coupled to ice-cooling unit provided with a high pressure fan in trial to reduce the temperature of the blowing ambient air over the glass cover. Solar still performance was evaluated using saline water (15000ppm) depth of 4cm without cooling as a control treatment and air-cooled glass cover under different values of air velocities and cooling tactics with taking into consideration the solar still temperatures, productivity and instantaneous efficiency. The obtained results revealed that, the increase of the cooled air velocity from 1.4 m/s (natural wind) to 5 m/s and cooling tactic of 20minon -10min off gave a remarkable increase in water-inner glass temperature difference (ΔTwgi) from 10 to 21°C and the productivity from 0.505 to 0.645 L/m2.h at the peak performance hour which led to achieve the highest accumulated yield of 3.545 L/m2.day and instantaneous efficiency of 43.2% with an increment of about 17 and 10.8%, respectively higher than solar still without cooling. Additionally, the air velocity of 7 m/s has irrelevant effect on the solar still performance, but on the contrary it gave less improvement. Hence, it is obvious that the air-cooled glass cover enhanced the solar still performance. | ||||
| Keywords | ||||
| pyramid-shaped solar still; cooling; glass cover; air velocities; cooling tactics; solar still performance | ||||
| References | ||||
|
Al-Garni, A.Z. (2012). Productivity enhancement of solar still using water heater and cooling fan. J. Sol. Energy Eng., 134(3):031006.
Bhardwaj, R., M.V. ten Kortenaar and R.F. Mudde (2015). Maximized production of water by increasing area of condensation surface for solar distillation. Appl. Energy, 154: 480–490.
El-Samadony, Y.A.F. amd A.E. Kabeel (2014). Theoretical estimation of the optimum glass cover water film cooling parameters combinations of a stepped solar still. Energy, 68:744–750.
El-Sebaii, A.A.(2004). Effect of wind speed on active and passive solar stills. Energy Convs. and Manag., 45:1187-1204.
Kabeel, A.E. (2009). Performance of solar still with a concave wick evaporation surface. Energy, 34(10): 1504- 1509.
Kalidasa ,M. K., K.K. Chockalingam, K. Srithar (2008). Progresses in improving the effectiveness of the single basin passive solar still. Desalination, 220 (1-3):677–686.
Kaushal, A. (2010). Solar stills: A review. Renew. and Sustain. Energy Rev., 14(1): 446-453.
Nafey, A. S., M. Abdelkader, A. Abdelmotalip and A. A. Mabrouk (2000). Parameters affecting solar still productivity. Energy Convers. and Manag.,42:1797–1809.
Nafey, A. S., M. Abdelkader, A. Abdelmotalip and A. A. Mabrouk (2001) Solar still productivity enhancement. Energy Convs. and Manag., 42:1401–1408.
Nafey, A. S., M. Abdelkader, A. Abdelmotalip and A. A. Mabrouk (2002). Enhancement of solar still productivity using floating perforated black plate. Energy Convers. and Manag., 43(7): 937-946.
Nayi, K. H. and K. V. Modi (2017). A detailed technical review on square pyramid solar still. Int. J. of Adv. Res. and Innovat. Ideas in Edu, 3(2): 3759-3766.Omara, Z. M., A. S. Abdullah, A. E. Kabeel and F. A. Essa (2017). The cooling techniques of the solar stills' glass covers–A review. Renew. and Sustain. Energy Rev., 78: 176-193.
Samee, M. A., U. K. Mirza, T. Majeed and N. Ahmad (2007). Design and performance of a simple single basin solar still. Renew. and Sustain. Energy Rev., 11(3): 543-549.
Somwanshi, A., and A.K. Tiwari (2014). Performance enhancement of a single basin solar still with flow of water from an air cooler on the cover. Desalination, 352: 92-102.
Srithar, K., T. Rajaseenivasan, N. Karthik, M. Periyannan and M. Gowtham (2016). Stand alone triple basin solar desalination system with cover cooling and parabolic dish concentrator. Renew. Energy, 90:157–165.
Suneesh, P.U., R. Jayaprakash, T. Arunkumar and D. Denkenberger (2014). Effect of air flow on V type solar still with cotton gauze cooling. Desalination, 337:1–5.
Taamneh, Y. and M. M. Taamneh (2012). Performance of pyramid-shaped solar still: Experimental study. Desalination, 291: 65-68.
Tanaka, H. and Y. Nakatake (2006). Theoretical analysis of a basin type solar still with internal and external reflectors. Desalination, 197:205–216.
Tarawneh, M.S.K. (2007). Effect of water depth on the performance evaluation of solar still. Jordon J. Mech. Ind. Eng.; 1:23–29.
Tawfik, M. A. (2012). Improving the performance of a pyramid-shaped solar still. Misr J Ag Eng., 29(4):1-15.
Tiwari, G.N. and H.N. Singh and R. Tripathi (2003). Present status of solar distillation. Sol. Energy, 75: 367–373.
Velmurugan, V. and K. Srithar (2011). Performance analysis of solar stills based on various factors affecting the productivity—A review. Renew. and Sustain. Energy Rev., 15 (2): 1294–1304.
Wassouf, P., T. Peska, R. Singh and A. Akbarzadeh (2011). Novel and low cost designs of portable solar stills. Desalination, 276(1):294-302.
Zeroual, M., H. Bouguettaia, D. Bechki, S. Boughali, B. Bouchekima and H. Mahcene (2011). Experimental investigation on a double-slope solar still with partially cooled condenser in the region of Ouargla (Algeria). Energy Procedia, 6:736- 42. | ||||
|
Statistics Article View: 206 PDF Download: 274 |
||||
