Assessment of The Luminance Distribution from Daylighting window by Using Image Processing Methodology

이미지 프로세싱 기법을 활용한 채광창의 휘도분포 평가

  • 박종명 (한국산업기술인증원) ;
  • 임홍수 (강원대학교 대학원) ;
  • 김정태 (경희대학교 건축공학과) ;
  • 김곤 (경희대학교 건축공학과)
  • Received : 2012.06.20
  • Accepted : 2012.10.04
  • Published : 2012.10.31

Abstract

Daylighting is the controlled admission of natural light into a space, reducing electric lighting and saving energy. By providing a direct link to the dynamic and perpetually evolving patterns of outdoor illumination, daylighting helps create a visually stimulating and comfort environment for building occupants, while reducing energy costs. Especially, however, glare is the most important factor in daylighting, which is issued by incoming direct sunlight into windows. This study analyzed the discomfort glare on a daylighting window by using Image processing methodology and found a solution to problems with glare source of occupants. There are several ways to evaluate discomfort glare such as UGR (Unified Glare Rating) of CIE, DGI (Daylight Glare Index, Hopkinson, 1972) and VCP (Visual Comfort Probability) of IES. These are used to apply to the relatively little artificial light source and they cannot cover discomfort glare from a real daylighting window. In this regarding, this paper aimed to calculate DGI index of the real daylighting window in a experimental space by using image processing methodology. The variables and outcomes are luminance distribution of non-shading window, effect of venetian blind installed on the window and locations related to position index of DGI.

Keywords

References

  1. CIE S 008/E-2001, Lighting of Indoor work places, pp 9-17, 2001.
  2. 신동수, 건축 가시화를 위한 HDRI 기반 3D 랜더링에 관한 연구 2005.12.
  3. 김원우, 신인중 창으로부터의 불쾌글레어를 평가하기 위한 DGI평가법의 한계성 검토, 대한건축학회논문집 계획계 제 20권 제 11호, 통권 193호, pp 285-291, 2004.11
  4. 임홍수, 김곤, 채광.조명설비시스템의 광학 분석을 위한 이미지 프로세싱 기법에 관한 연구, 한국생태환경건축학회논문집 Vol. 10. No.4 2010.08
  5. 박종명, 이금환, 김곤, 이미지 프로세싱 기법을 활용한 공동주택의 창면휘도 분포 특성에 관한 연구, 생태환경건축학회 학술발표대회 논문집 통권 21호, 2011.11.
  6. M. Tokura, T. Iwata and M. Shukuya, Experimental study on Discomfort Glare caused by windows part.3, j. Archit. Plann. Environ. Eng, AIJ, No. 489, 17-25, 1996
  7. Fawaz Maamari, Marilyne Andersen, Jan de Boer, William L. Carroll, Dominique Dumortier, Phillip Greenup, "Experimental validation of simulation methods for bi-directional transmission properties at the daylighting performance level", Energy and Buildings, Vol 38, Issue 7, pp 878-889, 2006.07 https://doi.org/10.1016/j.enbuild.2006.03.008
  8. M. Bouberi, L.L. Boyer, "Effect of window size and sunlight presence on glare", Light Research and Technology, Vol 24, 1992
  9. L. Bellia, G.F. Iuliano, G. Spada, "A Comparison between DGI Obtained Through Different Methods and Perceived Evaluation Index DDG", International Journal on Architectural Science, Vol 8, Num 1, pp 28-36, 2011
  10. Won Woo Kim,, Jeong Tai Kim, "A Position Index Formula for Evaluation of glare Source in the Visual Field", Indoor and Built Environ 2010;000:1-7
  11. Mehmedalp Tural, "A Diagnostic Tool for Assessing Lighting in Buildings: Investigating Luminance Contrast Relationships Through High-Dynamic-Range Image Based Analysis", Unpublished master's thesis, Arizona State University, Tucson, Arizona, 2011.08