A NEW DESIGN FOR A DOUBLE-CONDENSING CHAMBER SOLAR-STILL

A design of a double-condensing chamber solar still (DCS) is described . In this design the vapour is formed in the first chamber after the w ater is heated by solar radiation. Then the vapour is allowed to move into the second chamber through a vent provided at the top of the part ition wall of a solar still. The transferred vapour is condensed on th e metallic condensing surface behind the partition wall. The vapour is also condensed on the inner surface of the double glass cover of a so lar still. Experiments were carried out during September 1995 to Augus t 1996. The daily yields of the DCS and a conventional solar still are compared on the basis of experimental results. It has been observed t hat there is significant enhancement in daily output due to a maximum vapour pressure difference between the two condensing chambers on a cl ear day.