Abstract

A mathematical model of a ventilated solar evaporator for concentration of dilute waste is presented. The design is similar to conventional solar still design, but allows for air flow in order to enhance the evaporation rate. The model consists of energy and mass balances on the basin, liquid concentrate, air and glazing. The model shows that the thermal efficiency of the evaporator is enhanced by convective air flow. Single cover evaporators are more efficient than two cover evaporators. Energy storage in the basin reduces efficiency.

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