SET Proceedings 2978-4387 Caravel Press 10.65582/set.2008.320 2008.320 Preliminary Experiment on Daylighting Performance of Lightpipe under Different Sky Conditions KongHyo Joo hjk09005@hanmail.net KimJeong Tai jtkim@khu.ac.kr Architectural Engineering, Kyung Hee University, Yongin-si, Korea 24082008 7 1 978-1-995850-08-5 2262 2265 24 August 2008 © 2008 Copyright WSSET 2008

In order to ensure that daylight buildings will become the preferred option in this millennium, it is necessary to optimise energy savings by taking into account the integration of daylighting. Lightpipe systems are considered to save lighting energy and improve visual comfort. Accordingly, the purpose of this study is daylight performance of Lightpipe under overcast sky and clear sky. For the purpose, lightpipe system was designed as 650 diameter, with and aspect ratio of 2. Agilent data logger and photometric sensor were used. Lightfactor and illuminance were used to analyse daylight performance under different sky condition.

 lightpipe illuminance Lightfactor 24 to 27 August 2008 7th International Conference on Sustainable Energy Technologies SET2008 7 Seoul, Korea D. Jenkis, T. Munner, "Modelling light-pipe performance - a natural daylighting solution", Building and Environment, Vol. 38, pp. 965-972, 2003 G. Oakley, S. B. Riffat and L. Shao, "Daylighting Performance of Lightpipes", Solar Energy, Vol. 69, No. 2, pp. 89-98, 2000 IEA SHC Task 21, "Daylighting in Buildings", ECBCS Annex 29, 2000.06 M. Paroncini, B. Calcagni, F. Corvaro, "Monitoring of a light-pipe system", Solar Energy, Vol. 81 pp. 1180-1186, 2007 S. Szokolay, "Enrivonmental Science Handbook for Architects and Buildings, pp. 91, 1979 William M. C. Lam, Sunlighting as Formgiver for Architecture, Van Nostrand Reinhold, New York, 1986, pp. 146-156 http://www.solarspot.it/it/ http://www.whilkor.com/ http://en.wikipedia.org/wiki/Light_tube