%0 Journal Article %T Magnesium sulfate heptahydrate as phase change material in double slope solar still %A Khandagre, M. %A Gupta, B. %A Bhalavi, J. %A Baredar, P. %J Journal of Thermal Engineering %D 2021 %V 7 %P 196-214 %R 10.18186/thermal.871439