Abstract This paper proposes a multi-reflection heliostat to improve solar power tower plant performance. It can eliminate the significant cosine loss by keeping its aperture always facing the sun. The key structural parameters are specially designed for a superior solar image property. On its basis, a case study on the three-reflection heliostat is first conducted. By the field efficiency distribution comparison between the two types of heliostats, the multi-reflection heliostat is found to have an efficiency advantage in central region. Then in reference to the original Gemasolar field, the three-reflection heliostat field is generated by the proposed layout method. Its optical efficiency is 5.56% higher and the land area is 68.31% smaller, compared to the performance of the optimized Gemasolar field. For the purpose of practical application, the heliostat with ganged multi-reflection modules is developed. The occupied land area of its field is 51.28% less than that of the latter one. The prototype of five-reflection heliostat is developed for a further performance validation. In the outdoor test, the solar concentrating performance agrees well with the simulation result.

中文翻译：

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太阳能发电塔系统多反射定日镜场的设计与性能分析

摘要 本文提出了一种多反射定日镜，以提高太阳能塔式电站的性能。它可以通过保持其孔径始终面向太阳来消除显着的余弦损失。关键的结构参数是专为卓越的太阳图像性能而设计的。在此基础上，首先对三反射定日镜进行了案例研究。通过对两种定日镜场效率分布的比较，发现多反射定日镜在中部地区具有效率优势。然后参考原始 Gemasolar 场，通过所提出的布局方法生成三反射定日镜场。与优化后的 Gemasolar 场的性能相比，其光学效率提高了 5.56%，陆地面积缩小了 68.31%。为了实际应用的目的，开发了具有成组多反射模块的定日镜。其田地占用土地面积比后者减少51.28%。五反射定日镜的原型是为了进一步的性能验证而开发的。在室外测试中，太阳能聚光性能与模拟结果吻合良好。