**2. Experimental set-up of conventional solar still**

The conventional still is the basic device used for desalination known as the CSS (conventional solar still). It converts the saline water into pure drinking water by heating the water as solar radiation passes through the glass cover and heats the blackened absorbing bottom of the still and evaporated vapor condenses on the underside of the cold glass. The glass is opaque material for solar radiation. It also works as a condensing surface for vapor produced in the still. Heating, evaporation and condensation take place in the same piece of equipment.

In this preparative project, conventional still output was tested and recorded at the Government Polytechnic, Ahmadabad. The experimental set-up is shown in **Figure 2**. The different temperatures, humidity, solar radiation and wind velocity were recorded and compared with the other still configurations.

**Figure 2.**  *Experimental set-up of CSS.* 

This is the simplest device used for solar desalination fabricated from fiber reinforced plastic (FRP) known as the passive still. The glass inclination was 45°. The basin area was 0.5 × 0.5 m2 .
