The lack of drinking water is a real global problem. Transforming polluted water into freshwater is another problem. Solar distillation seems a simple and economical solution to this problem, but the yield of a solar still is low, and this poses another problem. One of the best ways to improve the productivity of freshwater from solar energy is to incorporate sensible heat energy storage materials; i.e., the temperature elevation of a material allows for the storage of energy, and that is exactly the purpose of our work. Two similar solar distillers were exposed to the sun in May 2017 under the same weather conditions. Distiller Dc is retained as a reference and distiller Ds contains in its basin a black plate of zinc 48 by 48 cm with a thickness of 0.2 cm. This plate is used as a sensitive thermal storage material to improve the productivity of our device. The results of this simple and inexpensive technique have improved the productivity of distiller Ds by 1.54 times compared with the conventional Dc still. Thus, this technique increases the productivity of the distiller and participates in solving a technical problem affecting the solar still.

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In this work, undoped and doped thin oxide films with fluorine (F: SnO 2) were prepared by spray ultrasonic technique on ordinary glass substrates heated to 480 ° C, using as precursor SnCl 4 dissolved in methanol. The UV-Visible spectrum was employed to investigate optical characteristics of the films (transmittance, optical gap and refraction index) before and after doping. To evaluate growth velocity of the films the thickness of films was calculated using the Manifacier and Swanepoel method. UV-Visible spectrum reveal that the prepared SnO 2 films have a good transmittance laying between 74-85% in visible region and have an optical gap between 3.87 to 4 eV. We have noticed that growth velocity decreases with increasing doping level from 300nm/min for the doped films at 3% to 220nm/min for the doped ones at 6%.

Energy sources play an important role in the development of humanity, with the industrial and technological evolution of our century. Energy demand is increasing every year, for this reason we must seek an alternate source of energy more specifically new and renewable energy including solar energy. Note that solar energy is abundant, especially the southeastern Algeria, where solar radiation is significant in any year. Given that it is the cheapest of all other energy, many researches and experiments have been conducted to recover the maximum amount of renewable energy and to address the problems of use and operation to reduce and save energy traditional. This work concerns the development of a new device is a basin filled with water used as a solar plane and a storage medium. The results obtained are very important in terms of heating water, the water temperature at outlet of basin reaches up to 74 ° C, also the inlet temperature is 29 ° C.