Abstract Heliostat daylighting systems, used to transmit sunlight deep into rooms where natural light cannot reach, are increasingly applied in buildings. A roof-mounted heliostat with an area of 22.95 m2 was developed in this work to verify the feasibility of high flux and long distance daylighting in large building interior. The developed heliostat system consists of a heliostat, a secondary reflector, and glass windows forming the light path within the building. The problem of gravitational deformation of the steel beams base of the heliostat was solved by a rectification algorithm embedded into the computer program, to realize vertical daylighting. The spectrum and chromaticity of the heliostat daylighting system developed was measured, and the results verify the good visual quality of the interior illumination. The light transmission distance is more than 70 m, and the system can provide a level of 20–80 klux daylighting illuminance in the daytime. An economic analysis was carried out, and data indicates a good cost-effectiveness of the heliostat daylighting system developed. It is hoped that this research will be of some reference value to the design of heliostat daylighting systems in large buildings.

中文翻译：

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定日镜在大型建筑室内日光照明中的应用

摘要 定日镜采光系统用于将太阳光传输到自然光无法到达的房间深处，越来越多地应用于建筑物中。在这项工作中开发了一个面积为 22.95 平方米的屋顶定日镜，以验证在大型建筑内部进行高通量和长距离采光的可行性。开发的定日镜系统由定日镜、二次反射器和形成建筑物内光路的玻璃窗组成。通过嵌入计算机程序的校正算法解决定日镜钢梁底座重力变形问题，实现垂直采光。对开发的定日镜采光系统的光谱和色度进行了测量，结果验证了室内照明的良好视觉质量。光传输距离大于70m，系统在白天可提供20-80klux的日光照度。进行了经济分析，数据表明所开发的定日镜采光系统具有良好的成本效益。希望本研究对大型建筑定日镜采光系统的设计具有一定的参考价值。