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Optimizing solar still performance: A numerical study on the feasibility of water film cooling over the glass cover

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  • Aftiss, Reda
  • Najim, Monssif
  • Tbatou, Taoufik
  • Hissouf, Mohamed

Abstract

The present paper aims to investigate the effect of glass cooling technique on the productivity of solar still. Three systems are analysed and compared: conventional type, solar still with film cooling (SSF), and solar still with double glass film cooling (SSD). The impact of thermal insulation in relation to the glass cooling is extensively examined. A numerical simulation of the transient energy equations in two dimensions, incorporating a nodal approach in the third dimension, is used in this study. The implicit finite difference method is adopted to solve the system of equations. To ensure the accuracy and validity of our model, the present results are compared with experimental findings existing in the literature. The results indicate that the use of double glass cooling decreases the productivity compared to single glass cooling (SSF). Additionally, under optimal insulation, the integration of the cooling system reduces the productivity of the conventional type by approximately 22.27%. However, for low thermal insulation (14 W/m2 K), the SSF system achieves maximum daily productivity, approximately 3.58 kg/m2 day.

Suggested Citation

  • Aftiss, Reda & Najim, Monssif & Tbatou, Taoufik & Hissouf, Mohamed, 2026. "Optimizing solar still performance: A numerical study on the feasibility of water film cooling over the glass cover," Renewable Energy, Elsevier, vol. 261(C).
    • Handle: RePEc:eee:renene:v:261:y:2026:i:c:s0960148126000947
    DOI: 10.1016/j.renene.2026.125269
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