Skylight: a hollow prismatic CPC

Antonio Alvarez Fernandez-Balbuena; Daniel Vázquez-Moliní; Berta Garcia-Fernandez; Angel Garcia-Botella; Eusebio Bernabeu

doi:10.1117/12.825818

20 August 2009 Skylight: a hollow prismatic CPC

Antonio Alvarez Fernandez-Balbuena, Daniel Vázquez-Moliní, Berta Garcia-Fernandez, Angel Garcia-Botella, Eusebio Bernabeu

Author Affiliations +

Proceedings Volume 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI; 74230T (2009) https://doi.org/10.1117/12.825818
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Many applications involve the use of a compound parabolic concentrator (CPC) like, natural lighting, thermal applications, optics for illuminators, optical fibre coupling and solar energy. The use of a CPC in reverse mode for natural lighting gives the chance to use it as a lighting skylight in ceilings because light output is controlled inside the design angle, on the contrary having a low flux transfer ratio because of the reduced area of the entrance pupil regarding exit pupil. The authors propose an innovative 3D hollow prismatic CPC (HPCPC) made of a dielectric material, which has a high efficiency comparing it with aluminium CPC. The basic idea is to use a hollow prismatic light guide with CPC shape. This paper reports 2D, 3D design and numerical analysis by raytracing software, also experimental results are shown. The system works almost like a true CPC when light enters through standard entrance pupil and also collect light that enters outside entrance pupil. Performance and efficiency of the prismatic CPC is in average 300% higher than standard aluminium CPC for collimated light in a range from 0º to 85º. A prototype has been developed and tested.

Citation Download Citation

Antonio Alvarez Fernandez-Balbuena, Daniel Vázquez-Moliní, Berta Garcia-Fernandez, Angel Garcia-Botella, and Eusebio Bernabeu "Skylight: a hollow prismatic CPC", Proc. SPIE 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI, 74230T (20 August 2009); https://doi.org/10.1117/12.825818

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