“…In this situation, many researchers dedicated to combining solar stills with cooling enhancement techniques, eliminating the possibility of vapor loss from the system. The main methods include external vapor condenser [14,25], water [26] or air flowing [27] above the cover, thermoelectric cooling [28], etc. A recent study showed a 305% increase in productivity of solar still by jointly adopting vacuum operation and enhanced cooling method, where the temperature of the cooling water was 15 °C below the ambient temperature [29].…”