A constant head tank, 500x500x300 mm was
used to control the level of water inside the still
by a float installed at the tank's inlet. A feeding
tank 400x400×600 mm was used to compensate the still water on a daily basis. All components
were installed on one frame. Solar radiation was
measured by a pyranometer (Kipp and Zonen
CM5), which was fixed in a horizontal position
on the top of the frame. Radiation was recorded
by a solar integrator (Kipp and Zonen CC11).
Temperatures at various locations within the still
and the collector were measured by means of
copper-constantan (Type-T) thermocouples.
Temperature read-outs were taken by a multi-
channel microprocessor. Wind speed was mea-
sured by a digital anemometer installed in a
horizontal position near the still cover.