Potable Water Production by Single Slope Active Solar Distillation Unit—A Review

A solar energy operated still unit, i.e., SDU is a recommended system which is much suitable to treat the brackish water with the use of heat of the Sun. The process of distillation is same as nature makes rain. The earliest use of solar systems for the purpose of water treatment was liberally used in 1551, and further the corresponding advanced still was used in 1882 by Arab alchemists and Charles Wilson, respectively. So, they started the new age of potable water production techniques and quite useful as the whole world facing the water scarce situations which are becoming more severe day by day. In this study, a wide classification and review of published research work have been done that is based on the concentrated and vacuum-type tube collectors connected solar still systems. This article covers various modifications which have been made in single slope distillation unit especially based on the compound parabolic concentrator and evacuated tube collectors.