| The concentrating tandem perovskite solar cell photovoltaic-thermal integration system is a new energy-saving and environmentally friendly energy utilization method.How to improve the performance of the concentrating tandem perovskite solar cell system is an important part of the solar energy utilization process.To this end,this paper designs a set of photovoltaic-photothermal integrated system for concentrating laminated perovskite cells,and completes the design and simulation of composite parabolic concentrator(CPC),laminated perovskite cells(PTSCs),PV/T(photovoltaic/photothermal)system.The specific results are as follows :(1)Selection of tandem perovskite solar cells under concentrating conditions.Compared with conventional solar cells,considering the photoelectric conversion efficiency and environmental protection,silicon-based laminated perovskite solar cells are selected as the top battery of the system.(2)Design and structure optimization of concentrator.Through the analysis of the principle and structure of CPC concentration,the Monte-Carlo algorithm is used to repeat the ray tracing experiment,and the Tracepro software is used to simulate.The performance parameters of CPC system with 8 times concentration ratio and 2 times concentration ratio and 1/4truncation and 2/3 truncation are compared.The results show that the average light intensity received by the bottom battery surface before and after the 8-fold concentration ratio CPC system is truncated does not change much,while the average light intensity of the 2-fold concentration ratio CPC system after 2/3 truncation and 1/4 truncation decreases by 29.9 %and 2.7 %,respectively.Therefore,the 1/4 truncated 2-fold concentration ratio CPC with less material and little change in performance is selected as the concentrator of the integrated system.(3)The heat transfer and flow characteristics of the concentrating laminated perovskite PV/T system were numerically simulated by Fluent software,and the optical,electrical and thermal properties of the system were analyzed.When analyzing the seasonal variation of system performance,compared with summer and winter,the energy received by the PV/T system in summer is 36.5% higher than that in winter,and the power generation of the system is increased by 3.2%.This is because the power generation efficiency of the solar cell is negatively correlated with the temperature of the battery.The greater the solar irradiation intensity,the higher the battery temperature,the lower the efficiency.The heating capacity of the system increased by 49.1%,and the cooling water temperature increased by 23.7%.It can be seen that the heat supply of the system and the temperature of the cooling water are positively correlated with the intensity of solar radiation.When analyzing the change of system performance with time,it is found that the system power generation during10:00-13:00 is less than that during 13:00-16:00,while the system heat supply increases first and then decreases with time.(4)After analyzing the influence of PTSCs and CPC installed in the system on the performance of the system,aiming at the influence of heat generated by solar radiation on the performance of the PV/T system,the influence of solar radiation intensity on the temperature of silicon cells and the outlet temperature of cooling water under different flow rates of cooling fluid is analyzed.At the same flow rate,the average temperature of silicon cell and cooling water outlet changes approximately linearly with the intensity of solar radiation.For every 300W/m~2 increase in radiation intensity,the average temperature of silicon cell increases by about 4°C,and the average temperature of cooling pipe outlet increases by about2°C.Under the same solar irradiation intensity,the average temperature of silicon cell decreases with the increase of cooling water flow rate,and the outlet temperature of cooling pipe increases with the increase of cooling water flow rate.Finally,the influence of regional differences on the performance of PV/T system is explored.It is found that the surface temperature distribution of the system in the near-equatorial city has obvious influence,and the flow field distribution in the calculation domain has little influence. |
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