الفهرس 
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Abstract
In this work, a 30 m3/ day RO desalination plant is designed and installed in wadi al- natroon site and is taken as a case of study. hence, the objectives of this study were 1) to design and install a reverse osmosis desalination unit utilizing hybrid renewable energy system (photovoltaic and wind energy), 2) develop a mathematical simulation model to describe the performance of the RO desalination unit, 3) develop a computer program to predict the performance of the RO desalination unit under different operations conditions and test its validity under different climatic and other conditions and 4) comparing the computer performance results with the actual performance of the development unit.