Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Analyses on Daylight Variations for Optimum Controls of Daylight Dimming Systems in a Small Office

소규모 사무실에 적용된 조광제어 시스템의 최적제어를 위한 주광변화 분석

  • 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)
  • 윤연주 (삼성물산 건설부문 기술연구소) ;
  • 백용규 (서일대학 건축과) ;
  • 김수영 (연세대학교 주거환경학과)
  • Received : 2012.01.19
  • Published : 2012.05.10
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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.

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References

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