LONG-TERM COMPARATIVE-STUDY OF SOLAR-DISTILLER SYSTEMS

We show how the thermal losses within and outside a solar distillation unit vary with water depth in the basin of a passive solar still. The latent heat of vaporisation has been used for distillation under both passive and active modes of operation. The flow rate of the water mas s over the glass cover has been optimised for different depths of wate r in the basin. The monthly performance of different distiller units i s compared in terms of yield and overall thermal efficiency.