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Comparative study is carried out between nano fluid (nf) CuO+ZnO+H2O and water (H2O) as solitary fluid through experimental and simulation result. The outcome of nano fluid and solo H2O flowing inside rectangular strip mini channel with or without mini insert were admit, for study the conduct of fluid flow and heat-exchange features like Nusselt number (Nu), Friction factor (f), Effectiveness (Ɛ), Coefficient of thermal transfer (h), Heat transfer factor (Q), Nu/Nus, f/fs, thermal-performance factor (TPF), Number of transferring unit (NTU) and Reynolds's number (Re). During composing of nano fluid 0.01% volume fraction, 10-20 nm size nano particles were mixed with 0.5ml CTAB surfactant. Experimentation was managed for different operating parameters under counter flow conditions, where nano fluid is flowing inside mini channel of 2 mm diameter with flow rate 0.0001562 kg/sec (9.37 ml/min) to 0.006255 kg/sec (375.30 ml/min) and hot water is flowing inside the concentric tube of 3cm diameter with flow rate of 0.000782 kg/sec (46.92 ml/min). The operating temperature of nano fluid and hot water were 303K and 323K. As per obtained results, the proposed composition of nanofluid showed better performance than normal water due to better thermal conductivity and extra molecular area gain in nanofluid due to addition of nano particle with base fluid, Thus, it improved the results 18%-21% approximately. Whereas better optimum results were observed in case of rectangular mini channel with mini insert compared with other geometry because of rich turbulency gain and extra exposed area due to mini insert. It affects optimum results in terms of better performance up to 9%-15% compared with simple micro channel without inserts.

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The purpose of this study is to investigate the possibility of improving electrical (cell) efficiency, thermal efficiency, and overall performance by adding w-rib roughness to the bottom of the absorber plate. the bottom of the absorber plate being given w-rib roughness. Based on a mathematical simulation of the PV/T system as a function of pertinent geometrical parameters, such as relative roughness pitch, relative roughness height, and angle of attack, as well as design parameters, such as temperature rise and insolation, the performance parameters—enhancement of electrical efficiency, thermal efficiency, and overall performance—have been assessed. The system was examined using this simulation in relation to important geometrical factors. The results show that adopting w-rib roughness yields a significant improvement over the performance metrics obtained using smooth absorber plates.