Journal
OPTICS COMMUNICATIONS
Volume 405, Issue -, Pages 378-386Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2017.08.046
Keywords
Nonimaging optics; Concentrators; Solar energy; Lightguide
Categories
Funding
- National Nature Science Foundation of China (NSFC) [61605016]
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For high concentration ratio of the planar concentrator which is mainly used for photovoltaic or solar-thermal applications, the ray-leakage must be prevented during rays propagated in the lightguide. In this paper, the design of a ray-leakage-free discal solar concentrator is proposed which provides a high concentration ratio while acquiring a high optical efficiency. The design structure of the coupling structure is a straightforward hemisphere instead of complicated structure in other concentrators because the emergent rays from the hybrid collectors have any tilt angle, which prompts the ray-leakage-free propagating length can be raised greatly. A mathematical model between geometrical concentration ratio, reflection times and the corresponding parameters is established, where the corresponding parameters include the parabola coefficient, outermost collector width, collector height, the expanding angle and the collector quantity. Numerical simulation results show that more than 1200x geometrical concentration ratio of the proposed concentrator is achieved without any leakage from the lightguide. (C) 2017 Elsevier B.V. All rights reserved.
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