Hybrid solar lighting (HSL) systems distribute natural sunlight to luminaires located in office or retail buildings in order to reduce energy consumption associated with conventional lighting systems. HSL systems reduce energy consumption directly by reducing the lighting energy and indirectly by reducing the associated cooling loads. A key component of the HSL system is the fiber optic bundle (FOB) that transmits the light from the collector to the luminaire. The observed thermal failure of the FOB when exposed to concentrated sunlight has motivated the development of a thermal model of this component. This paper describes the development of a predictive thermal model of the heat transfer in an FOB for an HSL system. The model is verified experimentally against temperature measurements obtained in the lab under controlled conditions and provides a powerful design tool that can be used to evaluate alternative thermal management strategies.

1.
Burkholder, Frank. TRNSYS Modeling of a Hybrid Lighting System: Energy Savings and Colorimetry Analysis, Solar Energy Laboratory, University of Wisconsin - Madison, USA, June 2004
2.
Muhs
J.
, “
Hybrid Solar Lighting Doubles the Efficiency and Affordability of Solar Energy in Commercial Buildings
,”
CADDET Energy Efficiency Newsletter
, No.
4
, pp.
6
9
(
2000
)
3.
Fraas, L., Daniels, W.E. and Muhs, J. “Infrared Photovoltaics for Combined Solar Lighting and Electricity for Buildings,” Proceedings of the 17th European Photovoltaic Solar Energy Conference, 2001
4.
Gueymard
C.
, “
Parameterized Transmittance Model for Direct Beam and Circumsolar Spectral Irradiance
,”
Solar Energy
, Vol.
71
, No.
5
, pp.
325
346
,
2001
5.
Gueymard, C., “SMARTS, A Simple Model of the Atmospheric Radiative Transfer of Sunshine: Algorithms and Performance Assessment.” Professional Paper FSEC-PF-270-95. Florida Solar Energy Center, 1679 Clearlake Road, Cocoa, FL 32922, 1995
6.
Schlegel, G.O., A TRNSYS Model of a Hybrid Lighting System, Solar Energy Laboratory, University of Wisconsin - Madison, USA, June 2003
7.
Duffic, J.A. and Beckman, W.A., Solar Engineering of Thermal Processes, 2nd Ed., John Wiley and Sons, 1991
8.
Tekelioglu, M., Wood, B.D., Thermal Management of the Polymethylmethacrylate (PMMA) Core Optical Fiber for use in Hybrid Solar Lighting, International Solar Energy Conference, Kohala Coast, Hawaii Island, March 15–18, 2003
9.
Mitsubishi Rayon Co., LTD. ESKA Optical Fiber Division. Specification Sheet CK-120
10.
Frank P. Incropera and David P. DeWitt, “Fundamentals of Heat and Mass Transfer,” John Wiley & Sons Inc., 5th edition, NY, 2002.
11.
Klein, S.A., et al., EES, Engineering Equation Solver, Solar Energy Laboratory, University of Wisconsin - Madison, USA, 2005.
12.
N. Huber, J. Heitz, D. Ba¨uerle, “Pulsed Laser Ablation of Polytetrafluoroethylene (PTFE) at various wavelengths,” The European Journal Physical Journal Applied Physics, November 2003, 33–38.
13.
Oriel Instruments catalog. The Book of Photon Tools.
14.
ANSYS Inc., Southpointe 275 Technology Drive Canonsburg, PA (www.ansys.com)
15.
Kanzaki
Hidetoshi
,
Sato
Kazuo
,
Kumagai
Mikio
, “
A Study of an Estimation Method for Predicting the Equivalent Thermal Conductivity of an Electric Coil
,”
JSME
,
56
(
526
),
1990
,
1752
1758
.
This content is only available via PDF.
You do not currently have access to this content.