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Proceedings Paper

Skylight: a hollow prismatic CPC
Author(s): Antonio Alvarez Fernandez-Balbuena; Daniel Vázquez-Moliní; Berta Garcia-Fernandez; Angel Garcia-Botella; Eusebio Bernabeu
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Paper 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.

Paper Details

Date Published: 20 August 2009
PDF: 12 pages
Proc. SPIE 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI, 74230T (20 August 2009); doi: 10.1117/12.825818
Show Author Affiliations
Antonio Alvarez Fernandez-Balbuena, Univ. Complutense de Madrid (Spain)
Daniel Vázquez-Moliní, Univ. Complutense de Madrid (Spain)
Berta Garcia-Fernandez, Univ. Complutense de Madrid (Spain)
Angel Garcia-Botella, Univ. Politécnica de Madrid (Spain)
Eusebio Bernabeu, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 7423:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI
Roland Winston; Jeffrey M. Gordon, Editor(s)

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