太阳能热发电集热器接收面辐射分布研究

为分析太阳集热器接收面太阳辐射的接收情况, 根据太阳高度角、太阳方位角、晴天模型和集热器进口的几何设计, 采用蒙特卡洛法建立了太阳辐射能束的方向、大小、位置以及抛物反射面镜面反射的关键算法。以西安地区( 纬度) 为例, 分别对夏至、冬至与春分太阳时12 点, 8 点和16 点时进行了计算。结果显示了不同时刻接收面的太阳辐射接收分布情况; 并由面积分求解接收面上的平均辐射强度, 反演了常规设计方法确定的聚光比。研究表明, 该方法可模拟一年中任意时间接收面的太阳辐射情况, 为太阳能热发电系统用集热器辐射分布研究提供了方法。

Research on Solar Radiation Distribution on Heat Collector Receiving Surface in Solar Thermal Power Generation

To analyze solar radiation on heat collector receiving surface,based on solar angle,solar azimuth angle,sunny day model,and geometry of heat collector inlet,key algorithms of the direction,magnitude,and position of solar radiation beam,as well as parabolic mirror reflection are established using Monte Carlo method.Using Xi'an area(latitude of) as example,calculations on 12 o'clock solar time of Summer Solstice,midwinter,and vernal equinox,as well as 8 and 16 o'clock solar time of vernal equinox are carried out.Results show the solar radiation distribution at different time.Through calculating average radiation intensity on receiving surface by surface integral,the convergence ratio determined by conventional method is deduced.Research shows that present method is capable of simulating solar radiation on receiving surface at any time in a year,providing a method for solar heat collector radiation distribution study in solar thermal power generation system.