Computational Simulation and Analysis of Major Control Parameters of Time-Dependent Photovoltaic/Thermal Collectors

Abstract

In order to improve the transient performance of photovoltaic/thermal (or PV/T for simplicity) collectors, this paper firstly developed and validated a computational thermal model to investigate the effects of the major control parameters on the thermal performance of PV/T collectors, including inlet water temperature and inlet water flow rate. Secondly, a computational electrical model of PV/T system, coupled with the thermal model, was also introduced to elaborate the relationship of voltage, current and power of a PV module (MSX60 poly-crystalline solar cell) used in an experiment in the literature. The thermal and electrical models were solved simultaneously to predict the transient energy conversion efficiencies of the PV/T system. Simulation results were found to agree with the experimental data very well. The effects of the time-steps from 1 hour to 1 minute, which is closed to the real time, were also reported at various conditions. It was found that both thermal and electrical efficiencies are fluctuating with time. There is an optimal water flow rate at which the efficiencies are at the maximum. At last, several suggestions to improve the efficiency of PV/T system were discussed.