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Evaluation Study of a Double Blind Light Pipe Daylighting System Efficiency and an Illumination Energy Reduction

이중 블라인드 광파이프 주광 조명시스템 효율 및 조명에너지 절감량 평가 연구

  • Received : 2012.10.10
  • Accepted : 2013.02.22
  • Published : 2013.02.28

Abstract

A DBLP(Double blind light pipe) daylight system can be installed at a building exterior wall or roof to replace artificial light during the day time. This system was consisted of a double blind light collector, a mirror duct type light transformer and a prism light pipe distributor. The double blinds were used to track the sun's altitude and azimuth movements to collect the sunlight throughout the day. The sunlight collected by the light collector was reflected on the first mirror and the second mirror and sent to the light pipe through the light transformer. The transformer was designed to deliver the sunlight into the light pipe efficiently. The light distributor plays a role in diffusing the sunlight coming in through the light collector to be used for indoor lighting. In this paper, a DBLP system has been designed, installed and tested at a KIER daylighting twin test cell. The DBLP daylighting system was applied to the experimental test cell which has an indoor area of 2.0 m wide ${\times}$ 2.4 m height ${\times}$ 3.8 m length. The experiment was conducted from January 30 to February 27, 2012, under clear skies and partially cloudy skies. Data was collected from 10:00 am to 16:00 pm every 2 minute and the average was calculated for every 30 minute of the data collection to obtain the system efficiency. The results indicated that the DBLP system efficiency was evaluated as 11.67%. The DBLP system indoor illumination energy reduction was predicted as 0.822 kWh/day. This could replace 4 sets of a 32W fluorescent lamp operating 6.4 hours per a day.

Keywords

References

  1. Kang. E. C.etal.,Tracepro Simulation Design and Evaluation forthe Double Blind Light Pipe Daylighting System, Jouranl of SAREK, Vol. 24, No. 6, 2012.
  2. Kang, E. C.etal., Circular Fresnel POF(Plastic OpticalFiber) Daylighting System Performance Evaluation Study, Journal of the Korean Solar Energy Society, Vol.31, No.1, 2011. https://doi.org/10.7836/kses.2011.31.1.031
  3. Choi, Y. J., Kang, E. C. and Lee, E. J., Performance Comparison Studyon LFLP and DBLP Daylighting System, Transactions of the Korean Society of Mechanical Engineers-B, Vol.35, No.8, 2011
  4. Alvin, W.et al.,Development of New Solar Collection System for Light Pipe Technology, Proceedings of the KSES 2004 Spring Annual Conference, 2004.
  5. Lee, E. J., Light Concentration and Light Pipe Daylighting System Technologies, The Magazine of Korean Solar Energy Society, Vol.7, No.1, 2008.
  6. Lambda Research Corporation, Trace Pro User's manual Releas 3.0, 2002.
  7. KEMCO, Standards for New & Renewable Energy Facility-Daylight System, PV 601:2007.,2007.