耦合微通道与相变材料的太阳能光伏/热系统实验研究OA

The development and utilization of solar energy,a clean resource,is regarded as a crucial approach to alleviate the global energy crisis and environmental pressure.However,traditional solar energy utilization systems still face multiple technical bottlenecks,such as the photoelectric conversion efficiency being affected by temperature,low comprehensive energy efficiency of the system,and the temporal and spatial mismatch between energy supply and demand.Therefore,this paper proposes an integrated temperature control and heat storage photovoltaic/thermal system combining multi-layer microchannels and shaped phase change materials.An experimental test platform was constructed to compare and analyze the thermoelectric performance of a conventional PV system,a PV-PCM hybrid system,and the novel integrated system proposed in this study.The effects of key parameters,including solar irradiance,working fluid flow rate,and PCM mass,on the operational characteristics of the system were emphatically investigated.The experimental results demonstrate that the integrated temperature control and heat storage PV/T system exhibits excellent comprehensive performance.At a solar irradiance of 1000 W/m2,the maximum operating temperature of the PV cells can be controlled within 55.3℃,and the electrical and thermal efficiencies of the system reach 12.8%and 24.7%,respectively.Compared with the conventional PV system and the PV-PCM hybrid system,the overall efficiency of the proposed system is increased by 29.2%and 46.2%,respectively,with a maximum value of 58.3%.Further analysis reveals that with the increase in solar irradiance,the electrical efficiency,thermal efficiency,and overall efficiency of the system show a downward trend,while the maximum output power continues to rise.In addition,increasing the working fluid flow rate in the microchannels and the loading mass of PCM can significantly reduce the operating temperature of the PV module and enhance the electrical and thermal efficiencies of the system.On the other hand,under non-solar irradiance conditions,the system can effectively delay the cooling and solidification process of the PCM.Compared with the traditional PV/T system,the thermal retention time of the heat storage unit is extended from 78 min to 154 min.