Experiment of a stepped solar still water distillation divice combine with auxiliary condenser

At the present, there were many research and manufacture subjects the distilled water equipment by using solar energy in Viet Nam. Most of them were designed on traditional type which have a complex shape, cumbersome and low performance. With the aim of this study is to make a simpler, lighter equipment and enhanced production of distilled water, we fabricated a water distillation device which has ladder shape combine with a condensing auxiliary and using solar energy with an area of 1 m2 (evaporation area). The experimental study has established at inclined angles 200, 250, 300 ; circulate and does not circulate steam under conditions at Nha Trang City in 10/2023. The results showed that when the depth distilled water layer is 1cm at the inclined angle 250, the device gave the highest yield, production of distilled water reach 4.9l/m2 (from 7am to 17pm) corresponding to the average radiation of 635W/m2. The efficiency of the distillation equipment with circulation 7.1% higher than does not steam.