Abstract
Nowadays a sharp increase in the energy demand has put a huge load on the conventional sources of energy resulting in their depletion. So uses of non-conventional sources of energy in different applications have been emphasized. Energy of sun is vast and green energy source and India is blessed with solar energy. Evacuated Tube Solar Collectors (ETSCs) are equipment utilized to trap solar energy. The energy trapped in the ETSCs can be used for domestic and industrial applications. Various techniques have been used to enhance the efficiency of ETSCs. This article provides an outline of various techniques which have been utilized to enhance the efficiency of ETSCs. In some of these efficiency enhancement techniques, collectors have been used as a basis for optimization process. Parameters which were optimised in the literature include tube length, tube radius, number of tubes, heat pipe geometry and shape of the evacuated tube. This review article discuss Computational Fluid Dynamics(CFD) based studies showing influence of nano-fluids as heat transferring fluid, effect of different phase changing materials on ETSCs efficiency. The work also summarizes the influence of reflectors and different techniques used for reducing heat losses on performance on ETSCs. The present study is worthy in applications involving optimum performance and low costs.
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