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The work evaluates experimentally technique to improve fresh water production by careful energy recovery in the vapour condensation processes; the recovered heat in turn on drives additional evaporation and preheats the feedwater. A pilot plant is designed and constructed in an arid area with 2 m solar evaporation collector area to evaluate the process. This unit is tested on cold and hot days. The effect of main parameters on fresh water production of the unit is studied. The experimental results show that, the production rate and efficiency of the system are strongly affected by solar radiation and level water in solar evaporation collector. Within the studied ranges, the maximum productivity reached to 16.1 kg/ mday at Tvap,av = 87.6 C , solar radiation 842 W/m and level water 1.912 kg. According to these results, fresher water production of the present system is higher than that solar still desalination system in the previous studies.

A new Solar Desalination System Design and Heat Recovery