SET Proceedings 2978-4387 Caravel Press 10.65582/set.2008.070 2008.070 Application of high-density daylight for indoor illumination HanH. J. hjhan@khu.ac.kr KimJ. T. jtkim@khu.ac.kr Graduate School, Department of Architectural Engineering, Kyung Hee University, Yongin-si, Korea Department of Architectural Engineering, Kyung Hee University, Yongin-si, Korea 24082008 7 1 978-1-995850-08-5 555 564 24 August 2008 © 2008 Copyright WSSET 2008

A fiber optic solar concentrator system with a simple parabolic profile is designed and fabricated to deliver a stream of high-density solar flux into the interior of a building for indoor illumination. The system consists of a small dish concentrator (30cm in diameter), an optical fiber cable and a diffuser at the end. A series of tests are performed using a goniophotometer and spectrometer to investigate the photometric characteristics of the system in terms of luminous intensity distribution and spectral radiance, which are used in link with the actual photometric measurements for a lightless mock-up space of 4.9mx4.9mx2.6m. The illuminance on the working plane was continuously monitored at 25 points by using photometric sensors. Measurements clearly indicate the photometric characteristics of the present system where a constant level of indoor illumination is observed depending on the sky clearness.

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