الفهرس 
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Abstract
In this thesis, experimental and theoretical study of a portable apparatus for extracting water from atmospheric air by using desiccant is presented. The experimental water-extraction unit is designed, manufactured, and tested for several days during (October, November, December) 2016 and (April, May) 2017 at the Faculty of Engineering, Mansoura University, Egypt (latitude 31.0409 oN and longitude 31.3785 oE). The unit extracts water from atmospheric air by using solar energy as the heating source and Calcium Chloride (CaCl2) solution of concentration about 30% as desiccant material. The unit consists of double-faced conical-finned absorber (64cm diameter and 64cm height), double-faced conical transparent surface (68cm diameter and 68cm height). Double-faced conical-finned configuration enlarges the absorber surface area form 0.9 m2 in case of double-faced conical configuration to 3.3 m2. The unit is provided with a telescopic stick (carrier), and base. At night, the conical absorber which is made from cloth layer impregnated with desiccant solution is exposed to atmospheric air to allow Calcium Chloride solution to absorb moisture. During daytime, the absorber is covered with the tightly-closed double-faced conical transparent surface which is exposed to solar radiation. As solar energy increases the absorber temperature, the absorbed vapor regenerates from the solution and condenses on the surface. The condensate is collected in a bottle through a hose. Radiation intensity, absorber temperature, cover temperature, ambient temperature, and productivity are recorded. The measured accumulated productivity is found to range from 0.3295 to 0.6310 kg/m2/day. Apparatus efficiency ranges from 11.26% on the 9th October 2016 to 22.56% on the 4th December 2016.