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Proceedings Article

Skylight: a hollow prismatic CPC

[+] Author Affiliations
Antonio Alvarez Fernandez-Balbuena, Daniel Vázquez-Moliní, Berta Garcia-Fernandez, Eusebio Bernabeu

Univ. Complutense de Madrid (Spain)

Angel Garcia-Botella

Univ. Politécnica de Madrid (Spain)

Proc. SPIE 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI, 74230T (August 20, 2009); doi:10.1117/12.825818
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From Conference Volume 7423

  • Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI
  • Roland Winston; Jeffrey M. Gordon
  • San Diego, CA | August 02, 2009

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.

© (2009) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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 (August 20, 2009); doi:10.1117/12.825818; http://dx.doi.org/10.1117/12.825818


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