双焦点微型聚光器安装于建筑外墙的光学性能分析

建筑外墙安装的微型聚光器在高层建筑太阳能利用技术中具有巨大的应用潜力。结合太阳辐射资源和聚光器光学效率，提出了计算加权平均光学效率的数学模型，并基于该模型，研究了双焦点微型聚光器在不同安装方式下的光学性能。对4个城市全年加权平均光学效率的计算结果显示：双焦点微型聚光器安装于建筑外墙时，夏季效率最低，冬季效率最高；安装地纬度对不同安装方式下聚光器的光学性能有较大影响。此外，基于光学模拟结果，分析了安装于聚光器端部的反射膜对余弦损失的抑制作用。

Optical Performance Analysis for a Bifocal Micro Concentrator Installed at Facade

Micro⁃concentrators installed on building facades have great potential in the field of solar energy utilization technology for high ⁃ rise buildings. A model is proposed to calculate the weighted average optical efficiency，which integrates two dimensions of solar radiation resources and the optical efficiency.This model is used to investigate the optical performance of a dual⁃focus micro⁃concentrator under different tracking methods.By calculating the annual weighted average optical efficiency of 4 cities，the result reveals that the efficiency is at its lowest in summer and highest in winter when the micro ⁃ concentrator is installed on facades. The latitude of the installation site has a greater effect on the optical efficiency. In addition，this paper analyzes the suppressive effect of the reflective film installed at the end of the concentrator on reducing cosine losses based on the optical simulation results.