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Exergy analysis of a passive solar still

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  • Torchia-Núñez, J.C.
  • Porta-Gándara, M.A.
  • Cervantes-de Gortari, J.G.

Abstract

This paper presents a steady-state and transient theoretical exergy analysis of a solar still, focused on the exergy destruction in the components of the still: collector plate, brine and glass cover. The analytical approach states an energy balance for each component resulting in three coupled equations where three parameters—solar irradiance, ambient temperature and insulation thickness—are studied. The energy balances are solved to find temperatures of each component; these temperatures are used to compute energy and exergy flows. Results in the steady-state regime show that the irreversibilities produced in the collector account for the largest exergy destruction, up to 615W/m2 for a 935W/m2 solar exergy input, whereas irreversibility rates in the brine and in the glass cover can be neglected. For the same exergy input a collector, brine and solar still exergy efficiency of 12.9%, 6% and 5% are obtained, respectively. The most influential parameter is solar irradiance. During the transient regime, irreversibility rates and still temperatures find a maximum 6h after dawn when solar irradiance has a maximum value. However, maximum exergy brine efficiency, close to 93%, is found once Tcol

Suggested Citation

  • Torchia-Núñez, J.C. & Porta-Gándara, M.A. & Cervantes-de Gortari, J.G., 2008. "Exergy analysis of a passive solar still," Renewable Energy, Elsevier, vol. 33(4), pages 608-616.
    • Handle: RePEc:eee:renene:v:33:y:2008:i:4:p:608-616
    DOI: 10.1016/j.renene.2007.04.001
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    References listed on IDEAS

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    1. Shukla, S.K. & Sorayan, V.P.S., 2005. "Thermal modeling of solar stills: an experimental validation," Renewable Energy, Elsevier, vol. 30(5), pages 683-699.
    2. Torres R, E & Picon Nuñez, M & Cervantes de G, J, 1998. "Exergy analysis and optimization of a solar-assisted heat pump," Energy, Elsevier, vol. 23(4), pages 337-344.
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    2. Sharshir, S.W. & Elsheikh, A.H. & Peng, Guilong & Yang, Nuo & El-Samadony, M.O.A. & Kabeel, A.E., 2017. "Thermal performance and exergy analysis of solar stills – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 521-544.
    3. Fatih Selimefendigil & Ceylin Şirin & Hakan F. Öztop, 2022. "Experimental Performance Analysis of a Solar Desalination System Modified with Natural Dolomite Powder Integrated Latent Heat Thermal Storage Unit," Sustainability, MDPI, vol. 14(5), pages 1-15, February.
    4. Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2013. "A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 677-690.
    5. Gaur, M.K. & Tiwari, G.N., 2010. "Optimization of number of collectors for integrated PV/T hybrid active solar still," Applied Energy, Elsevier, vol. 87(5), pages 1763-1772, May.
    6. Pons, Michel, 2012. "Exergy analysis of solar collectors, from incident radiation to dissipation," Renewable Energy, Elsevier, vol. 47(C), pages 194-202.
    7. Maddah, Hisham A. & Bassyouni, M. & Abdel-Aziz, M.H. & Zoromba, M. Sh & Al-Hossainy, A.F., 2020. "Performance estimation of a mini-passive solar still via machine learning," Renewable Energy, Elsevier, vol. 162(C), pages 489-503.
    8. Kianifar, Ali & Zeinali Heris, Saeed & Mahian, Omid, 2012. "Exergy and economic analysis of a pyramid-shaped solar water purification system: Active and passive cases," Energy, Elsevier, vol. 38(1), pages 31-36.
    9. Hassan, Hamdy, 2020. "Comparing the performance of passive and active double and single slope solar stills incorporated with parabolic trough collector via energy, exergy and productivity," Renewable Energy, Elsevier, vol. 148(C), pages 437-450.
    10. Milad Setareh & Mohammad Reza Assari & Hassan Basirat Tabrizi & Mohammad Alizadeh, 2024. "Performance of a stepped solar still using porous materials experimentally," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 26(11), pages 28519-28538, November.
    11. Nadal-Bach, Joel & Bruno, Joan Carles & Farnós, Joan & Rovira, Miquel, 2021. "Solar stills and evaporators for the treatment of agro-industrial liquid wastes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 142(C).
    12. Sangi, Roozbeh & Müller, Dirk, 2018. "Implementation of a solution to the problem of reference environment in the exergy evaluation of building energy systems," Energy, Elsevier, vol. 149(C), pages 830-836.
    13. Ranjan, K.R. & Kaushik, S.C., 2013. "Energy, exergy and thermo-economic analysis of solar distillation systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 709-723.
    14. Macmanus Chinenye Ndukwu & Lyes Bennamoun & Merlin Simo-Tagne, 2021. "Reviewing the Exergy Analysis of Solar Thermal Systems Integrated with Phase Change Materials," Energies, MDPI, vol. 14(3), pages 1-26, January.
    15. Sangi, Roozbeh & Müller, Dirk, 2019. "Application of the second law of thermodynamics to control: A review," Energy, Elsevier, vol. 174(C), pages 938-953.

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