الفهرس 
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Abstract
Herein, the performance of a hemispheric solar still equipped with four alternative combinations is experimentally studied. The experiment had four stages, firstly the distiller’s flat basin was replaced by a V-corrugated basin. Secondly, the corrugated basin was covered with a black cotton wick material. Thirdly, paraffin wax as a phase change material (PCM) was contained under the wick-coated corrugated basin for latent thermal storage purpose. Finally, paraffin was replaced with sheep fat PCM. Each modified distiller was compared to a conventional one from 8 AM until 9 PM under the climate conditions of Suez City, Egypt lies at (29. 5825 °N, 32.5734°E) in terms of the thermal performance, daily productivity, and freshwater cost. The four cases showed increasing in the daily productivity by ratios of 11%, 25.7%, 34.1% and 39.6% respectively. The fourth case showed the best water productivity as well as the best thermal performance. In other words, the fourth case had daily productivity of 4737.5 ml/m2 and 45 % thermal efficiency. Furthermore, the thermal performance in terms of the thermal and exergy efficiencies improved by 39.75% and 44.04%, whereas the average total heat transfer coefficient increased by 5.5%. Moreover, the freshwater cost was 0.0137$/L, likewise, 17.5% cost reduction.