Development and Applications of Natural Light Illumination System

• Main Authors: Yi-Lung Lai, 賴毅龍
• Other Authors: Allen Jong-Woei Whang
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/63582167229042333798

博士 === 國立臺灣科技大學 === 電子工程系 === 103 === In this dissertation, the typical technology development of Light Illumination System (NLIS) at National Taiwan University of Science and Technology (NTUST) in Taiwan is reviewed. The two-dimensional mathematical models of cascading right-angle prisms were proposed to describe the collection efficiency on the relationship between cascading right-angle prisms and the path of the sun. In addition, the collection efficiency of the modified NLIS design can be improved by modifying the length of every prism, 3 cascading prisms, and sunlight rotating around the prism in y-z direction. The performances of NLIS Components are summarized. Some interesting applications are also discussed, and take an example of NLIS with phototransistor sensor LED supplementary lighting. In addition, a basic concept of costs is proposed to evaluate the payback period. Chapter 2 proposed the mathematical models of cascading right-angle prisms. To deal with the collection efficiency problems for cascading right-angle prisms, they have been verified by FRED optical design software. The mathematical models are proposed to analyze the collection efficiency on the relationship between cascading right-angle prisms and the path of the sun. In addition, the collection efficiency of the modified NLIS design can be improved by modifying the length of every prism, 3 cascading prisms, and sunlight rotating around the prism in y-z direction. Chapter 3 summarized the proposed the performances of NLIS Components. Considering low cost and ease of installation and maintenance, NLIS system is a promising candidate for illumination and building energy saving. The NLIS system is composed of light collector, light transmitter and light emitter. Thus, the formula of the total efficiency of NLIS system is ηtotal = ηcollector × ηtransmitter × ηemitter, where ηcollector is efficiency of light collector subsystem, ηtransmitter is efficiency of light transmitter subsystem, and ηemitter is efficiency of emitter subsystem. In addition to these subsystems, interface components, couplers, between each systems is also important to affect the total efficiency of NLIS system. Chapter 4 introduced some current applications and took an example to describe the illumination requirements. In practice, NLIS system is cost-effective and provides many benefits for the people who use it. Chapter 5 showed the calculation of payback period to find the opportunity to installation of NLIS; therefore, the NLIS has remarkable economic significance.