| Summary: | 碩士 === 國立臺灣科技大學 === 光電工程研究所 === 103 === Due to the energy crisis, each country takes environmental issues seriously. Renewable energy has become the most popular research topics. Among renewable energy sources, the sunlight is the most abundant and distributed widely, many researches have developed daylighting systems to save electricity consumption. Natural Light Illumination System (NLIS) is one of the daylighting systems that transform the natural light for interior illumination. The NLIS system is composed of three sub-systems, light collection, light transmission, and light emission. The overall efficiency of the NLIS is the sum of the three subsystems. Due to the refraction of light in different mediums of NLIS, the angle of the light is changed, this change resulted in reduction of transmission to the interior.
This paper presents an innovative freeform lens used in NLIS, which combines free-form lens to produce parallel beam and increases the natural light efficiency for interior illumination. We establish a surface to analysis the light distribution, such as the location, angle, and energy. When the collimator is manufactured, the positions of lens are adjusted so that parallel beams can be obtained, and the collimator is able to gather more energy from the collection system and insert into the transmitter system.
These results lead to a desirable performance for the collimator, the rays converge to ± 2 °and bring the efficiency up to 82%.
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