Proficiency improvement study on an inclined stepped solar still with different wick materials
P. Ramesh Kumar1, K. Srithar2,*, T. Rajaseenivasan2, M. Vivar3, M. Fuentes4
Inclined stepped solar still is tested with plain wick, wick with cotton, wick with coconut coir and sponge cubes.
Impact of water depths on solar still performance is analyzed.
Productivity of the solar still is considerably improved with the modifications.
The maximum energy efficiency of 48% and the exergy efficiency of 7% are reached.
Potential of an inclined stepped solar still is theoretically and experimentally
analyzed in this study. Solar still ability is improved by placing the materials
like plain wick, wick with cotton, wick with coconut coir and sponge cubes in
the solar still. These materials augment the distillate rate by increasing the
exposure area for evaporation. Initially, the stepped solar still is analyzed by
varying the water depth (2, 3 and 4 cm) in stepped tray. The optimum water
depth is selected and the further experiment is conducted with the wick
materials in the solar still. Energy and economic analysis is also performed in
this study. Result shows that the lowering the water depth and providing the
wick material improves the daily distillate output. The peak distillate of 4.65
kg/m2.day is collected in the stepped solar still contains wick with coconut coir
and sponges. It is about 32.9% higher compared to the conventional basin solar
still. The maximum energy efficiency of 48% and the exergy efficiency of 7%
are reached in the inclined stepped solar still. The minimum distilled water cost
of 0.034 $/kg in stepped solar still and 0.067 $/kg in conventional basin solar
still are achieved.
To cite this article: Kumar PR, Srithar K, Rajaseenivasan T, Vivar M, Fuentes M. Proficiency improvement study on an inclined stepped solar still with different wick materials. Journal of Desalination and Water Purification 2018;13:3-10.