The identification of the loss of performance due to low airflow velocities around the interface region brine/air, underlined the necessity to introduce modifications of the prototype. These are meant to increase air velocity as close to the water/air interface as possible. They are:

• adoption of a lowered evaporation channel, inducing higher airflow velocities around the interface brine/air;

• enhancement of chimney performance through the adoption of non-imaging optics, CPC type [4] , increasing the solar collection area and producing the heating of the whole chimney surface, augmenting the airflow driving force.

The introduction of such improvements to the ASD will predictably produce increased evaporation rates, which will be monitored next.