Performance Study Of Liquid And Solar Cells In Concentrating Photovoltaic Photothermal System With Liquid Beam Splitting

The liquid optical filter for concentrating photovoltaic thermal system not only solves the temperature rise of photovoltaic modules in essence,but also can output high-quality thermal energy externally,which greatly improves the comprehensive utilization efficiency of solar energy.this new technology has become the focus of attention.In the CPV/T system based on using the liquid optical filter,choosing the proper spectral beam splitting liquid is the core issue of the system.This article is divided into three parts,and the performance of the CPV/T system based on using the liquid optical filter is analyzed in detail.(1)Based on the performance requirements of spectral beam splitting liquids in the liquid optical filter of CPV/T system,a large number of traditional liquids were chosen as initially candidates,The optical properties of the candidate liquids were accurately analyzed by dual-optical pathlengths method after using a spectrophotometer.Based on the spectral response characteristics of the concentrating silicon cell and GaAs cell,the influence of the liquid optical filter on the photoelectric conversion efficiency of this two types of cells were theoretically analyzed.The smallest impact on the photoelectric conversion efficiency of the soalr cell is the C14 n-alkane.Howevert,the Valvoline has the greatest influence on the photoelectric conversion efficiency of the solar cell.(2)Using a current-voltage characteristic test system to investigate the effects of liquid optical filter on the electrical performance of concentrating silicon cell and GaAs cell.Analyse the effect of liquid type,liquid film thickness,salt solution concentration,and the spacing between filter and solar cell etc parameters.The electro-thermal performance of the liquid-frequency receiver was evaluated by the battery I-V characteristic curve,electrical performance parameters and performance index MF values.Among them,the performance of the receiver's electric heating performance is best when the Valvoline as spectral beam splitting liquid;the thickness of the liquid film and the concentration of the salt solutionhave a great influence on the electrical properties of the cell,the spacing between the liquid and the cell has little effect on the performance of the soalr cell.(3)A design model of CPV/T receiver base on liquid optical filter using a concentrating silicon cell was conceived,and the receiver was numerically simulated using Fluent software.The heat transfer characteristics of the receiver were mainly analyzed,and the effect of liquid type,flow rate and concentration ratio on the overall performance of the receiver were examined.The results show that,under the condition of 10 X light intensity,the overall efficiency of the receiver is 42.92% when the Valvoline as the filer with a flow rate of 0.0013 m/s,in which the temperature of the concentrator silicon cell is controlled at339.8K,and the temperature of the Valvoline can reach 473.3K.