PV/T太阳能光伏光热系统关键参数影响特性研究

利用PV/T太阳能光伏光热系统实验平台针对空气质量流量、太阳辐照强度、环境温度和大气降尘 4种影响系统性能的关键工况参数进行了实验研究。结果表明:在实验设定的流量范围内，PV/T系统的光热和光电效率都随着空气质量流量增大而稳步上升；太阳辐照强度增大时，系统输出电功率随之增大，光热效率变化较小，光电效率有一定程度的降低；环境温度在一定范围内时，系统的输出电功率和集热效率都随着环境温度的增大而增大，而当环境温度超过一定值后，系统的光伏模块受面板温度升高的影响光电转换效率呈下降趋势；随着积尘密度的增大，玻璃盖板的透射率减小，一个月的积尘量会导致系统光电效率和输出电功率分别下降17.84%和18.25%，若以光电效率衰减20%为界限，清洁周期为5周左右。

Research on Effect Characteristic of Key Parameters of PV/T Solar Photovoltaic Photothermal System

The PV/T solar photovoltaic photothermal system platform was used to conduct the experimental research for four kinds of key working condition parameters that affected system performance,including air mass flow,solar radiation intensity,ambient temperature and atmospheric dust.The results show that in the experimental set flow range,the photothermal and photovoltaic efficiencies of PV/T system increase with the increase of air mass flow steadily.When the solar radiation intensity increases,the output electric power of the system increases,the photothermal efficiency changes less,and the photoelectric efficiency reduces in a certain degree.When the ambient temperature is within a certain range,the output electric power and heat collection efficiency of the system both increase with the increase of ambient temperature.However,after the ambient temperature exceeds a certain value,the photovoltaic module of the system will be affected by the increase of the panel temperature,and the photovoltaic conversion efficiency will decrease.As the dust density increases,the transmittance of glass cover decrease,and the photoelectric efficiency and output power of system will be respectively reduced by 17.84% and 18.25% caused by one month dust deposition.If the photovoltaic efficiency attenuation of 20% is the limit,the cleaning cycle should be about 5 weeks.