Water film cooling over the glass cover of a solar still including evaporation effects

The effect of water film cooling of the glass cover on the efficiency of a single-basin still has been investigated numerically. Proper use of the film-cooling parameters may increase the still efficiency by up to 20%. On the other hand, a poor combination of these parameters leads to a significant reduction in efficiency. The presence of the cooling film neutralizes the effect of wind speed on still efficiency. Only a small fraction of the cooling film evaporates as it passes over the glass cover.