الفهرس 
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Abstract
This work is concerned with the theoretical investigation of the hybird deslination system whivh consists of thermal membrance distillation (DCMD) system. the desalination system is driven by parabolic trough solar collector (PTC).
IT IS AIMED to enhance the total fresh water productivity, performance ratio and thermal efficiency of all system. the mathematical models of the TVC and DCMD systems consist of energy and mass balance equations. on the other hand, the theoretical model of the PTC depends on three energy equations of the fluid element, receiver and glass cover.