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http://dx.doi.org/10.6110/KJACR.2012.24.5.433

Analyses on Daylight Variations for Optimum Controls of Daylight Dimming Systems in a Small Office  

Yoon, Youn-Ju (Samsung C&T Corp., Institute of Construction of Technology)
Baik, Yong-Kyu (Department of Architecture, Seoil College)
Kim, Soo-Young (Department of Housing and Interior Design, Yonsei University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.24, no.5, 2012 , pp. 433-442 More about this Journal
Abstract
The influence of outdoor sky conditions on photosensor signals were examined to determine an appropriate index that is effectively used for optimum illuminance fluctuation when a daylight dimming system is used for a small office. Field measurements were conducted under various sky conditions. Results indicate that the outdoor global and vertical illuminance fluctuated within narrow ranges under clear and overcast sky conditions. The fluctuation of sky ratio under partly-cloudy sky caused wide ranges of illumnance fluctuation. A partially-shielded photosensor at backwall produced 56% of light output from fixtures controlled by a photosensor at ceiling. This implies that the photosensor at backwall does not always guarantee target illuminance due to the less output. The fluctuation of light output from fixtures were insignificant under clear and overcast sky. The fluctuation range of photosensor illuminance under partly-cloudy sky caused wide fluctuation ranges of light output. Regression result implies that the outdoor vertical illuminance was recommended for an effective index that is used for control of light output.
Keywords
Photosensor signal; Illuminance fluctuation; Dimming control system; Sky ratio; Vertical illuminance;
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