Numerical simulation and experimental test of a novel compact solar collector with internally extruded pin-fin flow channel

Establishes a CFD model of flat box finned collector, and numerically simulates the fluid flow and heat transfer inner the collector. Builds a solar photovoltaic/thermal experimental system and carries out the winter experimental test. The simulation results are consistent with the experimental results, which verifies the reliability of the model. The results show that the outlet temperature decreases in a curve with the increase of the inlet flow, and the heat collection per hour increases linearly. When the flow velocity ranges from 0.5 m/s to 0.6 m/s, the temperature attenuation rate is about 10%, and the heat collection per hour increases about 12%. Both the outlet temperature and the heat collection per hour increase linearly with the increase of the heat source temperature, and the overall growth rate is about 33.33%. The temperature distribution is hyperbolic, and symmetrical vortices are generated at the cylindrical ribs. Under winter working conditions, the power generation efficiency of the PV/T system is less than 10%, the heat collection efficiency is about 12%, and the temperature of the water tank is about 25 ℃.