摘要：A comparative study was made between the performances of spherical solar still with charcoal absorber. It was studied in the climatic conditions of Coimbatore (11° N latitude), India. The area of the still was 0.30 m2. The still was covered by low density polyethylene sheet of thickness 0.107 mm with 90% of transmittance. The absorbance of water level is further increased by floating charcoal at the surface of the water level. The Nusselt and Grashof Numbers were calculated for both studies. The increase in potable water productivity caused, when using a spherical shape as well as adding charcoal was analyzed
