This paper presents an efficient solar water desalination system for the climate condition of Pakistan. Water scarcity issue of Pakistan is addressed and model of solar energy-based water desalination system is presented using TRNSYS software. Weather data profile of Karachi is taken in TRNSYS. Flat plate collector of 3 m2 is used to produce 3.249 kg/h clean water with steady state moisture rate to humidifier. It is observed that productivity of clean water is increased using parabolic mirror. It is found that temperature is increased using the same receiver area with parabolic trough and water production is increased from 3.249 to 3.276 kg/h for this system keeping the input moisture rate and air flow rate constant for both cases.

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