Effect of Hollow Drum Rotational Speed Variation on the Productivity of Modified Solar Still According to Yekaterinburg City, Russia.

The limited productivity of conventional solar still is considered as the main obstacle that restricts their implementation. Hence the objective of the current study is to enhance the productivity of conventional solar still (CSS) by increasing the evaporation area using a rotating hollow drum. Many factors have been considered in the investigation of the enhanced solar still (ESS) productivity; including environmental factors and operation factors such as drum rotational speed. Three rotational speeds have been used in the experimental tests (0.5, 1, and 3 rpm) during three typical days 12, 13, and 14 June 2019. All tests done for 12 h from 8:00 am to 20:00 pm. Study results showed that the productivity enhanced by about 161% with 0.5 rpm, 111% with 1 rpm, and 75% with 3 rpm rotational speed compared to conventional solar still. Accordingly, the productivity increased with decreasing rotational speed and the maximum value obtained at the lower speed (0.5 rpm). [ABSTRACT FROM AUTHOR]