STUDY ON PERFORMANCE OF COMPOUND PARABOLIC CONCENTRATING SOLAR PHOTOTHERMAL-PHOTO ELECTRICITY ENERGY SUPPLIER DEVICE
Aiming at the problems that the change of incident angle has a great influence on the heat collection performance and the escaped light is difficult to be reused when the traditional compound parabolic concentrator is in non-sun-tracking operation,a compound parabolic concentrating solar photothermal-photoelectric energy supply device is designed in this paper.By adding a photovoltaic module with a mirror back on the lower surface of the glass cover plate at the light inlet of the composund parabolic concentrator(CPC),the interception and reflection reuse of the escaped light can be realized,so as to improve the utilization efficiency and energy supply grade of the energy supply device to the incident solar radiation.Firstly,the optical simulation software TracePro is used to analyze the influence mechanism of the incident angle on the parameters such as the ray's receiring rate of the energy supply device.Based on the simulation results,under the actual weather conditions,the variation of the temperature difference between the inlet and outlet air,the photothermal conversion efficiency and the output electric power of the energy supply and the same specification CPC with the solar radiation are compared and studied.The results show that when the incident angle range is 0°<α<30°,the average of the energy supply device is increased by 14.03% compared with that of the same specification CPC.Under sunny conditions,when the heat transfer air flow rate is 2.7 m/s,the maximum inlet and outlet air temperature difference between the energy supply device and the CPC of the same specification is 0.2℃,and the photothermal conversion efficiency is 52.62% and 52.63%,respectively.The total output electric power of the energy supply device in this process is 251 W.Under the condition of cloudy days,the thermal energy and power output of the energy supply device are 3.26 MJ and 210.5 W,respectively.The research results provide a reference and idea for the efficient coupling and comprehensive utilization of solar photothermal-photoelectricity.
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