Optimum Control of a Photoelectric Dimming System in a Small Office with a Double Skin Envelope

  • Kim, Soo Young (Taubman College of Architecture & Urban Planning, The University of Michigan) ;
  • Yum, Sung Kon (Samsung Engineering & Construction, Housing Technology Team)
  • Received : 2004.03.15
  • Published : 2005.12.30

Abstract

A photoelectric dimming control system for a small private office space with a double skin envelope system was analyzed for the purpose of examining optimum control performances under a variety of daylight conditions. Computer simulations were performed for the three different photosensor types positioned at the center of ceiling in the space. They were applied in both a south and north-facing room. Daylight conditions were a fixed horizontal venetian blind on an external envelope and a retractable shading device on an internal envelope under a clear, intermediate and overcast sky at different times of a day and year. Partially-shielded photosensors provided good control performances providing the required electric light output under clear and intermediate sky conditions. Unshielded photosensors failed to provide necessary illuminance levels producing less electric output and fully-shielded photosensors generally provided excessive light output. Reasonable electric lighting energy savings were achieved except under overcast sky conditions where the control system did not contribute to energy savings due to the less daylight through envelopes. The retractable shading device covering 50% of the internal envelope reduced energy savings up to 19.62%, but the workplane illuminance levels were maintained within recommended ranges. The coefficients of determination between workplane illuminance and photosensor illuminance due to daylight ranged from 0.74 to 0.98. Partially-shielded conditions provided best correlations and the north-facing room yielded stronger correlation than the south-facing room.

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References

  1. Athienitis, A.K and Tzempelikos, A (2002) 'A methodology for simulation of daylight room illuminance distribution and light dimming for a room with a controlled shading device' Solar Energy. Vol. 72 (No.4) : 271-281 https://doi.org/10.1016/S0038-092X(02)00016-6
  2. Compagno. A. (1999) 'Intelligent glass facade, material practice design' Birkhauser Publishers for Architecture, Basel, Boston, Berlin, Germany
  3. Ehrlich. C., Papamichael. K., Lai. J., and Revzan. K. (2001) 'Simulating the operation of photosensor-based lighting controls' Energy and Buildings Vol.34. : 883-889 https://doi.org/10.1016/S0378-7788(02)00064-6
  4. Kim S., and Mistrick R. (2001) 'Recommended daylight conditions for photosensor system calibration in a small office.' The Journal of the Illuminating Engineering Society of North America, Vol. 29 (No.2) : 176-188
  5. Lawrence Berkeley National Laboratory (2000) 'Desktop Radiance User Manual.'
  6. Lee. E.S. , DiBartolomeo, D. and Selkowitz, S. (1999) 'The effect of venetian blinds on daylight photoelectric control performance' The Journal of the Illuminating Engineering Society of North America, Vol. 28 (No.1) : 3-23
  7. Lee. E. S., Selkowitz. S.,. Bazjanac. V., Inkarojrit. V.,Kohler. C. (2002) 'High-performance commercial building facade' The Lawrence Berkeley National Laboratory, Report-50502
  8. Lelius, J., Wallingford. K, Keenlyside. R., and Carpenter. J. (1984) 'Indoor air quality, The NIOSH (National Institute of Occupational Safety and Health) Experience' National Symposium of the American Institute of Architects
  9. Li. D. H., and Lam. J., C., (2001) 'Evaluation of lighting performance in office buildings with daylighting controls' Energy and Buildings Vol.33. : 793-803 https://doi.org/10.1016/S0378-7788(01)00067-6
  10. Littlefair. P. J. and Motin, A. (2001) 'Lighting controls in areas with innovative daylighting systems: a study of senor type' Lighting Research Technology, 33, 1 : 59-73 https://doi.org/10.1177/136578280103300112
  11. Mistrick. R. G., and Thongtipaya. J (1997) 'Analysis of daylight photocell placement and view in a small office, The Journal of Illuminating Engineering Society of North America, Summer: 150-160
  12. Ranasinghe. S., and Mistrick. R., (2003) 'A study of photosensor configuration and performance in a daylighted classroom space' The Journal of the Illuminating Engineering Society of North America, Vol. 32. (No.2) : 3-20
  13. Rubinstein. F., Ward. G., and Verderber, R. (1989) 'Improving the performance of photo-electrically controlled lighting systems' The Journal of the Illuminating Engineering Society of North America, Winter : 70-94
  14. Viljoen. A., Dubiel. J., Wilson. M., and Fontoynont. M. (1997) 'Investigations for improving the daylighting potential of double-skined office buildings' Solar Energy, Vol.59., : 179-194 https://doi.org/10.1016/S0038-092X(96)00149-1
  15. Ward. G.J. (1994) 'The Radiance lighting simulation and rendering system.' The Proceeding of 1994 SIGGRAPH Conference : 459-472