Numerical Analysis of Entropy Generation in Solar Parabolic Trough Collector Using Water (H2O) as Heat Transfer Fluid

Solar parabolic trough collectors (PTCs) are widely used in solar thermal energy systems for their high efficiency and cost-effectiveness. The numerical analyses of entropy generation in solar parabolic trough collectors (PTCs) are crucial for evaluating the performance and efficiency of such systems. In this study, a comprehensive numerical model is developed to investigate the entropy generation in a solar PTC that utilizes water as the heat transfer fluid (HTF). The model incorporates the fluid flow, heat transfer, and entropy generation phenomena occurring within the collector. The numerical simulations are performed to assess the influence of inlet temperature, flow rates of the HTF and Reynolds number (Re). The entropy generation rate and its distribution within the collector are analysed and quantified. The results demonstrate that increasing the mass flow rate of water led to higher entropy generation due to increased fluid friction. Bejan number (Be) value lies between 0.6 and 0.75 and it decreases as the mass flow rate of heat transfer fluid increases.