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Research Papers

Cost-Effective Light-Mixing Module for Solar-Lighting System Appended With Auxiliary RGBW Light-Emitting Diodes

[+] Author and Article Information
An Chi Wei

Department of Mechanical Engineering,
National Central University,
No. 300, Jhongda Road, Jhongli District,
Taoyuan City 32001, Taiwan
e-mail: acwei@ncu.edu.tw

Shih Chieh Lo

Department of Mechanical Engineering,
National Central University,
No. 300, Jhongda Road, Jhongli District,
Taoyuan City 32001, Taiwan
e-mail: rooogerlo06@gmail.com

Ju-Yi Lee

Department of Mechanical Engineering,
National Central University,
No. 300, Jhongda Road, Jhongli District,
Taoyuan City 32001, Taiwan
e-mail: juyilee@ncu.edu.tw

Hong-Yih Yeh

Institute of Nuclear Energy Research,
Atomic Energy Council,
No. 1000, Wenhua Road, Longtan District,
Taoyuan City 32546, Taiwan;
Department of Mechanical Engineering,
National Central University,
No. 300, Jhongda Road, Jhongli District,
Taoyuan City 32001, Taiwan
e-mail: markyeh@iner.gov.tw

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 11, 2017; final manuscript received August 2, 2017; published online September 12, 2017. Assoc. Editor: Jorge Gonzalez.

J. Sol. Energy Eng 139(6), 061006 (Sep 12, 2017) (6 pages) Paper No: SOL-17-1137; doi: 10.1115/1.4037746 History: Received April 11, 2017; Revised August 02, 2017

A light-mixing module consisting of a compound parabolic concentrator (CPC) and a light-mixing tube is proposed herein to realize a uniform and efficient solar-lighting system. In this lighting system, the sunlight collected into a fiber and then guided to an indoor destination is the principal light source, while an auxiliary light source including multiple red, green, blue, and white (RGBW) light-emitting diodes (LEDs) is controlled by an auto-compensating module. To mix the principal and the auxiliary sources and to realize the uniform illumination, the light-mixing tube was coated with BaSO4 and optimized as a cylindrical tube. The design of the light-mixing tube is described and discussed in this article. According to the simulated results, the uniformity and the optical efficiency of the designed light-mixing tube are 82.9% and 85.7%, respectively, while from the experimental results, the uniformity of 85.9% and the optical efficiency of 83.3% have been obtained. In terms of the common indoor-lighting standards and the specifications of commercial components used in lighting systems, the proposed light-mixing module has demonstrated the high uniformity and acceptable optical efficiency. Additionally, since the main components of the light-mixing module can be designed as plastic optics, a cost-effective light-mixing module and a profitable lighting system can be realized. Thus, the performance and the price of the proposed light-mixing module fit the demands of the illumination market, while the proposed system shows the potential for indoor solar-lighting applications.

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References

Figures

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Fig. 1

Structure of the proposed solar-lighting system

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Fig. 2

Measured spectra of the LEDs in use

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Fig. 3

Geometries of feasible light-mixing tubes

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Fig. 4

Design parameters of feasible light-mixing tubes (As for the optimized parameters of every geometry, refer to Table 4)

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Fig. 5

Simulated (a) optical efficiency and (b) uniformity with respect to the variation of the incident angle of the primary source for fabrication tolerance analyses of the correspeonding hole in the designed cylindrical light-mixing tube. The incident angle was influenced by the cut angle of this hole.

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Fig. 6

Simulated (a) optical efficiency and (b) uniformity with respect to the variation of the incident angle of auxiliary source for fabrication tolerance analyses of the correspeonding hole in the designed cylindrical light-mixing tube. The incident angle was influenced by the cut angle of this hole.

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Fig. 7

Photos of fabricated (a) CPC and (b) light-mixing tube

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Fig. 8

Experimental setup

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Fig. 9

Fixture with nine square holes for measuring the uniformity

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Fig. 10

Spectra of the primary source simulated by iPhone's white light and the compensated light

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Fig. 11

Calculations of (a) optical efficiency and (b) uniformity with respect to the reflectivity of the inner surface of the light-mixing tube

Tables

Errata

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