An inlet pipe is also fixed at the rear wall of
the still for feeding brackish water. Holes were
drilled in the body of still to fix thermocouples
to measure the temperature of water in the
basin, the inner and outer glass temperature,
and the vapor inside the still. A flat plate
138 O.O. Badran, H.A. Al-Tahaineh / Desalination 183 (2005) 137–142
collector (shallow box, 1.75 m long, 0.6 m
width and 0.15 m thicknesses) has been used
to preheat the water entering the still; the collector is made of seven parallel steel tubes, 1/2
inch diameter and 1.8 m length. The tubes are
welded to 0.7 mm thin sheet coated by a black
selective layer fixed on insulator (rock wool).