Research On The Density Distribution Of Concentrated Energy Flux In Trough Solar Collectors

Due to its stability and price advantage, now, concentration solar thermal power station is a rapid development field in solar power station construction. The design and construction of trough, disk and tower solar thermal power plant needs to analyze the solar concentrator density distribution. About the calculation of condenser focusing spot energy flux density distribution, two methods are common, there are Cone Optics and Monte Carlo Ray-Trace(MCRT).Cone optics method with the significance of explicit explanation if it was analysis from the perspective of mathematics. However,this formula is always hard to understand and not intuitive, when analysis and design a project is also not convenient. Monte Carlo Ray-Trace(MCRT), by contrast, is occur randomly, slow convergence rate. What’s more, the method is 4 integral operation, so the amount of calculation is very huge, cost a lot of time. It also needs to program complex composition or use professional software.Based on that, this study developed a new method to calculate the density distribution of condenser focusing spot energy flux.The method uses innovative dimension reduction, and based on the priori knowledge that radiation distribution has nothing to do with the tube axial,derive the irradiance distribution of double integral. In contrast with MCRT, this method greatly reduces the computational complexity. Software scale and calculation amount can be streamlined. Calculation case which traditional computer simulation software cost for several hours, the calculation process in this study can be completed in a few seconds.According to the new algorithm written software has the advantages of simple operation, quick calculation, is a powerful, convenient tool for solar thermal power generation equipment engineer.This thesis firstly introduces the principle and calculation process of the descending dimension algorithm. Then give the computational results of this algorithm compared with classic literature in the past. Give condenser flux distribution when parameters change in concentrator. And analysis of irradiated distribution under non ideal conditions. At the same time, this thesis also introduces a homogenizer measure which can make receiver get irradiation with uniform distribution. The discussion part verifies the convergence speed of the algorithm and calculation precision.