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Buildings 2017, 7(4), 92;

Daylighting System Based on Novel Design of Linear Fresnel lens

Department of Information and Communication Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin 449-728, Gyeonggi-do, Korea
Author to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 10 October 2017 / Accepted: 12 October 2017 / Published: 16 October 2017
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In this paper, we present a design and optical simulation of a daylighting system using a novel design of linear Fresnel lens, which is constructed based on the conservation of optical path length and edge ray theorem. The linear Fresnel lens can achieve a high uniformity by using a new idea of design in which each groove of the lens distributes sunlight uniformly over the receiver so that the whole lens also uniformly distributes sunlight over the receiver. In this daylighting system, the novel design of linear Fresnel lens significantly improves the uniformity of collector and distributor. Therefore, it can help to improve the performance of the daylighting system. The structure of the linear Fresnel lenses is designed by using Matlab. Then, the structure of lenses is appreciated by ray tracing in LightToolsTM to find out the optimum lens shape. In addition, the simulation is performed by using LightToolsTM to estimate the efficiency of the daylighting system. The results show that the designed collector can achieve the efficiency of ~80% with the tolerance of ~0.60 and the concentration ratio of 340 times, while the designed distributor can reach a high uniformity of >90%. View Full-Text
Keywords: Linear Fresnel lens; daylighting system; uniform irradiance distribution; uniform irradiance collector Linear Fresnel lens; daylighting system; uniform irradiance distribution; uniform irradiance collector

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Pham, T.T.; Vu, N.H.; Shin, S. Daylighting System Based on Novel Design of Linear Fresnel lens. Buildings 2017, 7, 92.

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