空间对称型二次反射太阳能聚集系统能量传输特性

Energy Transfer Characteristics of Symmetrical Space Two-Stage Reflected Solar Concentrator

聚光光伏系统的聚光比和聚集太阳能流密度分布的均匀性是评价其性能的重要指标,基于几何光学原理,建立了对称型二次反射聚集系统的数学物理模型,理论分析了偏轴聚集器倾角、二次斜面倾角等聚光系统的结构参数对能流密度均匀性和聚光比的影响,提出了优势参数组合;并采用射线踪迹蒙特卡罗法(MCRTM)对太阳光的聚集传输过程进行模拟,分析了接收面的能流密度分布特性。结果表明,对称型二次反射聚集系统在偏轴抛物面倾角、二次斜面倾角以及接收面高度参数的适当组合之下,聚光比适中,能流分布均匀,适宜用于空间聚光光伏发电。

Concentration ratio and irradiance uniformity are the most two significant attributes for evaluating a Concentrator Photovohaic （CPV） system. In this paper, the mathematical model of symmetrical Two-stage reflected concentrator is established. The effect of tilt angles of primary off-axis concentrator and secondary flat mirror on the concentration ratio and irradiance uniformity is analyzed based on geometrical optics. So that the predominant parameter combinations are obtained. The transmission of concentrated solar power is simulated by Monte-Carlo ray tracing method （MCRT）. And the flux distribution of receiving region is also analysed. The results show that the symmetrical Two-stage reflected concentrator has the characteristic of irradiance uniformity and proper concentration ratio when the tilt angles of primary off-axis concentrator and secondary fiat mirror and the height of receiving region fit well. This is suitable for the CPV system in space.