Malik, Nawaf Mehmood  <br/><br/>
Experimental Research on solar still technology, a promising solution for water purification in developing countries / 
Nawaf Mehmood Malik 
 - 86p.  Soft Copy  30cm 
<br/><br/> Water scarcity is a major problem, which the world is facing at the present moment.<br/>Most of the earth’s water is saline, comprising about 97 %. Solar still is a very economical<br/>and easy method for water desalination. This experimental research was conducted to<br/>enhance the output of square pyramid type solar still incorporating PCM (paraffin wax)<br/>and Fresnel lenses concentrating sunlight on bricks placed in basin area. Effect of hot water<br/>circulation in PCM was also observed on solar still distillate output enhancement.<br/>Experiments were conducted at different water depth levels (i.e., 1, 2, 3 and 4 cm) in<br/>Islamabad, Pakistan. Nocturnal output was observed to increase by using Fresnel lenses.<br/>Solar still output was observed to increase from 1 cm to 3cm in nocturnal hours and then<br/>started to decrease. When Fresnel lens was used, maximum distillate output in autumn and<br/>spring season was 0.9 L and 1.68 L at 1 cm water depth. Maximum distillate in simple<br/>experimental cases (without Fresnel lens utilization) was also at 1cm water depth. In<br/>autumn season it was 0.85 L and in spring 1.55 L. Circulation of hot water in PCM chamber<br/>increased both daytime and nocturnal output of solar still significantly 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MS Mechanical Engineering      
<br/><br/><label>Dewey Class. No.: </label>621