An optical fiber daylighting system with large Fresnel lens. (October 2018)

• Record Type: Journal Article
• Authors: li, Lei; Wang, Juntao; Yang, Zhuodong; Luo, Geng; Tong, Kai; Zhao, Jin; Song, Jifeng
• Is Part Of: Energy procedia. Volume 152(2018)
• Page Start: 342
• Page End: 347
• Publication Date: 2018-10
• Subjects: daylighting -- optic fibers -- transmission; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2018.09.146
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: Because of flexible installation and natural spectrum, the concentrated sunlight transmission systems via PMMA (Polymethyl methacrylate) fibers for indoor illumination are concerned widely in areas of building energy saving. Due to the long-term indoor work, the daily working population in cities lacks of natural light and is susceptible to various diseases. Therefore, from the health point of view, it is necessary to develop deep indoor daylighting. In this work, a sunlight concentration and transmission system was developed and tested, which uses a Fresnel lens with a diameter of 1m to achieve large flux collection. A reflection design of light path was adopted to resolve the problem of long focal length of the Fresnel lens. A hot mirror and a homogenizer were used to protect the optic fiber bundle from burned by high temperature. The results showed that the daylighting efficiency is about 11%-13%. The operability of the equipment was verified through experiments, proving that the equipment can be combined with buildings for daylighting. It is hoped that this research will be of some reference value to the design of optical fiber daylighting systems in buildings.