was carried out based on internal and external heat transfer and energy balance equations to predict its performance. Depending on the thermal analysis, passive and active
solar stills were installed (solar still and solar still integrated with flat-plate solar collector) to use solar desalination technology for producing freshwater.Water temperature aswell as both internal and external temperatures of glass cover, added to ambient temperaturewas measured with hour intervals, under all experimental conditions, for both
solar stills. Performance of both solar stills was studied as a function of change in basin brine depth and glass cover
thickness under conditions of applying glass cover cooling (flash tactic) or without cover cooling. Performance of
solar stills was evaluated in terms of recorded temperatures, instantaneous and internal thermal efficiencies and
system productivity. The experimental results revealed that active solar still maximizes both fresh water
productivity (10.06 l/m2·day) as well as internal thermal efficiency (80.6%) compared with passive solar still
(7.8 l/m2·day productivity and 57.1% internal efficiency) under conditions of 1 cm basin brine depth and
3 mm glass cover thickness and by applying flash tactic cover cooling with 5 min on and 5 min off.