Single slope solar still with NCL by Rahmani et al.
Solar still with nano fluids by Elango et al.
Inclined solar still with wire mesh and wick by Samuel Hansen et al.
Inbuilt condensing chamber by Sathyamurthy et al.
Double slope solar still with flat plate collector and cover cooling by Morad et al. Modified basin solar still with air cooled condenser by Elshamarka
and many others have given their findings for different weather and geographical conditions.
Can we have low cost system which could be equally efficient for any geometrical condition or may be for most part of the world.
If their is any literature than it really paves way for the new direction.