This paper discusses the performance evaluation of anidolic concentrators in an overcast sky condition. The concentrators were designed, with acceptance angles of 60°, 70° and 80°, first by maintaining the profile of the concentrator’s uniform and secondly by keeping the height uniform. Studies were done using these concentrators with a model light pipe and the performance was compared with that of an acrylic dome and a profiled Fresnel collector. For a given condition, the illuminance ratio (ratio of illuminance measured at the base of the pipe to external illumination) increased with the acceptance angle. For a given acceptance angle, the concentrator with uniform height and variation of entrance aperture, performed better than a concentrator having a uniform profile.
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References
1.
NairMGRamamurthyKGanesanAR. Conceptual design and assessment of profiled Fresnel lens daylight collector. Lighting Research and Technology2014; 0: 1–15. . First published 16 June 2014. doi: 1477153514535421.
2.
NairMGRamamurthyKGanesanAR. Day light enhancement using laser cut panels integrated with a profiled Fresnel collector. Lighting Research and Technology2014; 0: 1–12. . First published October 22, 2014. doi: 1477153514556524.
3.
ZhangXMuneerT. A mathematical model for the performance of light-pipes. Lighting Research and Technology2000; 32: 141–146.
4.
JohnsenKWatkinsR. Daylight in buildings – a source book on daylighting systems and components. [ECBCS Annex 29/SHC Task 21-Project summary report, July], United Kingdom: AECOM Ltd, 2000.
5.
Compagnon R, Scartezzini JL, Paule B. Application of non-imaging optics to the development of new daylighting systems: Proceedings of ISES Solar World Congress, Budapest, Hungary, 23–27 August 1993.
6.
WinstonR. Principles of solar concentrators of a novel design. Solar Energy1974; 16: 89–95.
7.
RablA. Comparison of solar concentrators. Solar Energy1976; 18: 93–111.
8.
RablA. Optical and thermal properties of compound parabolic concentrators. Solar Energy1976; 8: 497–511.
9.
WelfordWTWinstonR. High Collection Non-Imaging Optics, New York: Academic Press, 1989.
10.
WilliamsonDE. Cone channel condenser optics. Journal of the Optical Society of America1952; 42: 712–715.
11.
NilssonJ. Optical design and characterization of solar concentrators for photovoltaics. Licentiate thesis, Lund, Sweden: Lund University, 2005.
12.
. Kaplan GM. Understanding Solar Concentrators. Technical Paper # 30, Volunteers in Technical Assistance (VITA), 1985.
13.
ScartezziniJLCourretG. Anidolic daylighting systems. Solar Energy2002; 73: 123–135.
14.
SimoneCMCourretGPauleBMichelLScartezziniJL. Design of anidolic zenithal light guides for daylighting of underground spaces. Solar Energy2001; 69: 117–129.
15.
PerezRRealsRMichalskyJ. Modeling skylight angular luminance distribution from routine irradiance measurements. Journal of the Illuminating Engineering Society1993; 22: 10–17.
16.
Taengchum T, Chirarattananon S. Ray tracing method for simulating daylight transmission through tubular light pipes with anidolic concentrator: Proceedings of the 5th International Conference on Sustainable Energy and Environment (SEE 2014): Science, Technology and Innovation for ASEAN Green Growth, Bangkok, Thailand, 19–21 November 2014.
17.
HinterbergerHWinstonR. Efficient light coupler for threshold Cerenkov counters. Review of Scientific Instruments1966; 37: 1094–1095.
18.
KalogirouSEleflheriouPLloydSWardJ. Low cost high accuracy parabolic troughs construction and evaluation. Renewable Energy1994; 5: 384–386.
19.
SmestadGRiesHWinstonR. The thermodynamic limits of light concentrators. Solar Energy Materials and Solar Cells1990; 21: 99–111.
20.
Pereira M. Design and performance of a novel non-evacuated 1.2x CPC type concentrator: Proceedings of Intersol Biennial Congress of ISES, Montreal, Canada, 1985.
21.
Kittler R, Perez R, Darula S. A set of standard skies characterizing daylight conditions for computer and energy conscious design, US SK 92 052 Final Report, ICA SAS Bratislava, Bratislava: Polygrafia, 1998.
