Design and Simulation of a Secondary Solar Concentrator Constructed with a Circular Micro Prism Array for the Enhancement of the Concentration Ratio
Date Issued
2009
Date
2009
Author(s)
Fei, Wun-Ciang
Abstract
The main theme of the thesis is focus on the solar concentrator, including the basic knowledge, theory and design. At first, we start from the characteristic of sun and extend the relative knowledge to the solar cell. Furthermore, for the purpose of cost reduction, people develop solar concentrator to collect light in wider area than the area of traditional solar cell, which is illuminated directly without concentrator.In second chapter, since we have to know the theory about how to calculate power efficiency, starting from the Hungen’s theory to the fundamental electromagnetic waves theory is necessary so as to obtain the power efficiency just by handwriting. We also derive the equation for the prototype concentrator, such as Fresnel lens, parabolic concentrator and circular concentrator and introduce their characteristics, respectively. The third chapter is the kernel of this thesis, since it contains not only our idea but also the conclusions for our concentrator, called “micro circular prisms array”. Thus we can find the power efficiencies and power distributions under different conditions, such as different incident angles and bottom acute angles. Besides, since our model was fabricated for secondary concentrator, we used the common solar concentrator, Fresnel lens, as the primary concentrator and made several simulations with different variants, including NA value of Fresnel lens and incident angle. We also examine the power distribution upon the solar cell due to the reason that the solar cell needs high uniformity of incident rays so as to generate power efficiently. Finally, we can obtain the geometric concentration ratio of the secondary solar concentrator is 93 with a high efficiency of 90%, and the overall geometric concentration ratio can be 810 with an efficiency of 92%.
Subjects
solar concentrator
secondary concentrator
Type
thesis
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