Abstract
A practical optimization design is proposed, in which the solar direct light spectrum and multijunction cell response range are taken into account in combination, particularly for the Fresnel concentrators with a high concentration and a small aspect ratio. In addition, the change of refractive index due to temperature variation in outdoor operation conditions is also considered in the design stage. The calculation results show that this novel Fresnel lens achieves an enhancement of energy efficiency of about 10% compared with conventional Fresnel lens for a given solar spectrum, solar cell response, and corrected sunshine hours of different ambient temperature intervals.
Highlights
Because of the expensive cost and quality degradation, high reflectivity mirrors are not recommended for a concentration photovoltaic system (CPVs) [1], and optical refractive polymer components such as Fresnel lenses are most frequently used for commercial CPVs, which possess advantages of compactness, simplicity in manufacture, and relative cheapness [2,3,4]
The first is the dispersion of the solar spectrum, which leads to an essential decrease of the energy efficiency of the solar cells, especially for the Fresnel lens having a high concentration and a small aspect ratio
Watson and Jayroe Jr. [11] presented a method for the design of Fresnel lens with consideration of solar spectrum, the multijunction cell response and the influence of ambient temperature variation were not considered in design process
Summary
Because of the expensive cost and quality degradation, high reflectivity mirrors are not recommended for a concentration photovoltaic system (CPVs) [1], and optical refractive polymer components such as Fresnel lenses are most frequently used for commercial CPVs, which possess advantages of compactness, simplicity in manufacture, and relative cheapness [2,3,4]. Each groove profile is obtained at this wavelength by means of simple trigonometry These investigations were mostly devoted to analyzing the effect of dispersion of solar spectrum of the solar cell after designing, rather than to considering the solar direct light spectrum in the design stage of Fresnel lens [6,7,8,9,10]. [11] presented a method for the design of Fresnel lens with consideration of solar spectrum, the multijunction cell response and the influence of ambient temperature variation were not considered in design process. The temperature dependence of refractive index caused thermal effects which had rarely been taken into account in the design stage of Fresnel lens With this background, in this paper, a more realistic optimization method is proposed to design a high concentration Fresnel lens with a small aspect ratio. The influence of the change of refractive index caused by ambient temperature variation is considered in the design process
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