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Comparison between Performance Analyses of a Single Basin Solar Still Made Up of Copper with and without Use of Vacuum
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Abstract
The water and the energy are the two most essential things for the sustaining of life. Freshwater is one of the Earth's most valuable renewable resources. Water has been recognized as a basic human right. The increasing world population and the rapid increase of industry and agriculture activities all over the world contribute to the depletion and pollution of fresh water resources. The available fresh water is finite on earth and its demand is increasing day by day. The utilization of renewable energy has a flourishing future and plays an important role in the domain of brackish and seawater desalination in developing countries. A solar still is a low-tech way of distilling water, powered by the heat from the sun. The problem of solar stills is the low productivity. In this context, two stills of basin made with copper sheet were fabricated and experimentally tested for Nazareth climatic condition (90N, 770E) for atmospheric pressure and vacuum conditions. In this study the comparative performance of single basin solar still working between at atmospheric pressure and with low pressure of 0.1 bar inside a still basin are compared. The vacuum still ensures higher rates of evaporation even at low temperatures and in turn increases the efficiency. This cost estimation was done to find the feasibility to provide the rural communities an efficient way to convert the brackish water in to potable water. The theoretical results also agree well with the experimental ones.
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