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Abstract
This thesis presents a detailed study on parabolic trough solar collectors applied with a water desalination unit using a multi - effect distillation technique. Thermal design procedures were implemented to determine the full dimensions of the collector. Then, optical and thermal losses from the collector were investigated taking into consideration the shading effect and the end loss factor. Also, transient thermal performance of the collector was studied throughout the annual seasons. It was found that the best performance will be achieved in May during which the desalination unit can be solar operated for seven hours daily, producing 15 m³ / day of distillate water. Finally, the construction, manufacturing, and assembly steps of the parabolic trough collector were introduced