EXPERIMENTAL-STUDY OF EVAPORATION IN DISTILLATION

In order to measure various internal heat transfer processes, namely c onvective and evaporative in a solar still, an indoor simulation exper iment has been carried out over a typical operating temperature range. The condensing surface was maintained at three different environmenta l conditions: (a) by exposing it to ambient air temperature, (b) by ex posing it to air conditioned surroundings, and (c) by keeping ice on t he condensing surface. The temperature-dependent physical properties o f enclosed vapour were considered. The constants (C and n) for the con vective heat transfer coefficient were determined by using linear regr ession analysis. It was observed that the proposed model gives closure results with the experimental observation within an accuracy of 8%.