Solar energy is very useful in the process of desalination especially for areas that suffer from a\nlack of clean water resources. In recent years, many people have been using solar still. Therefore\nthe raising of the productivity and efficiency of solar still represents the most important problems\nthat need further research. The present work aims to study the effect of preheating the water entering\nto still and the effect of reducing pressure inside the still on the productivity of the solar\nstill. Therefore in present work two identical single basin typical double slope solar stills of the\ninner basin dimensions for each still 2 m Ã?â?? 1 m Ã?â?? 0.08 m, have been designed and fabricated with\nmild steel plate. One of them is conventional solar still and the other is modified with flat plate\ncollector and vacuum pump to study the effect of preheating and vacuum on the performance of\nsolar still. The experimental measurements are made to enhance the solar still productivity by\nfirstly preheating the water entering the still using flat plate collector and secondly by integrating\nthe still basin with vacuum pump. The results show that preheating the water entering the still increases\nthe water productivity by amount about 27.7% - 29.3%. The results also show that decreasing\npressure inside the still using vacuum pump improves the solar still water productivety\nby amount about 21.8% - 23.9%.
Loading....