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Proceedings Paper

Monitoring of a small top lighting solar light pipe system
Author(s): Yanpeng Wu; Zhiyou Yue; Rendong Jin
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Paper Abstract

Solar light pipes are effective method to induce sunlight into the room need to be illuminated to improve vision quality. This paper presents the results of monitoring a small solar light pipe located inside a windowless test box of about 0.22m3.The light pipe is 720mm long with the diameter 180mm.The average reflectivity of the internal surface is 0.82.The system has been monitored with luminometers to evaluate the distribution of the luminance on a working-plane under sunny conditions, cloudy conditions and overcast conditions. All the luminometers are automatic digital equipments, according with CIE photopic standard. The solar light pipe used in the experiment achieved minimum illuminance of 140lx overcast sky and achieved maximum of 1657lx under sunny condition. At the corner, the illuminance value decrease rapidly.The experimental results showed that uniformity ratio of illuminance of the light pipe variable with the sky conditions. Uniformity ratio of illuminance was 0.48 under overcast conditions, 0.44 at cloudy conditions, and 0.83 at sunny conditions in the middle in the test box. Compare the experimental results of sunny conditions with the values of overcast conditions, the difference is the intensity of the illuminance under sunny conditions was stronger and evenly than under the cloudy conditions.

Paper Details

Date Published: 2 December 2009
PDF: 10 pages
Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75061X (2 December 2009); doi: 10.1117/12.838185
Show Author Affiliations
Yanpeng Wu, Univ. of Science and Technology Beijing (China)
Zhiyou Yue, Univ. of Science and Technology Beijing (China)
Rendong Jin, Univ. of Science and Technology Beijing (China)


Published in SPIE Proceedings Vol. 7506:
2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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