by 215% when hot brackish water was fed during night time. Sethi and
Dwivedi [8] designed and fabricated a basin type double slope active
solar still under forced circulation mode and a performance evaluation
was carried out for different water depths of 0.03 m, 0.04 m and
0.05 m. The distillate output was maximum 4.82 kg for water depth
0.03 m and minimum 4.36 kg for water depth 0.05 m. The maximum
instantaneous thermal efficiency was 46.96% at water depth of 0.04 m.
Shanmugasundaram and Janarthanan [9] enhanced the productivity of
the single basin double slope solar still by integrating with shallow
solar pond. Itwas found that the productivity of the solar still integrated
with shallow solar pondwas increased compared with the still without
integration. The productivity of the solar still integratedwith and without
shallow solar pond was found to be 5.09 l/m2 day and 3.17 l/m2 day and
the theoretical results were in good agreement with the experimental
results. Eltawil and Omara [10] enhanced the productivity of a single
slope solar still by using a flat plate solar collector, spraying unit,
perforated tubes, external condenser and solar air collector. The
developed solar still (DSS) was evaluated in passive and active
modes and compared with the conventional solar still (CSS). The DSS
productivity was more than the CSS by 51–148% depending on the type
of amendment. The use of external condenser with solar still increased
the productivity by 51%. The use of circulated hot water in passive and
active sprays led to increase the DSS productivity by 56% and 82%,
respectively.