Cylindrically Symmetric Fresnel Lens for High Concentration Photovoltaics
Date Issued
2009
Date
2009
Author(s)
Hung, Yu-Ting
Abstract
High concentration photovoltaic (HCPV) utilizes point-focus cost-effective plastic Fresnel lens and a millimeter-sized Ill-V compound multi-junction solar cell is placed underneath focusing optics which can achieve cell efficiency potential of up to 40.7 %. The advantage of HCPV makes less solar cell area and higher efficiency; however, the acceptance angle of HCPV is about ?1∘, which is very small and the mechanical tracking of the sun is necessary. In order to reduce the power consumption, system cost and the angle tracking error of tracking systems, a light collector model with larger acceptance angle is designed with ZEMAX®. In this model, the original radially symmetric Fresnel lens of HCPV is replaced by cylindrically symmetric Fresnel lens and a parabolic reflective surface. Light is collected in two dimensions separately. And a couple of lenses and a light pipe are added before the solar cell chip in order to collect more light when sun light deviates from incident angle of 00. An acceptance angle of ?10∘ is achieved with GCR (geometric concentration ratio) 400.
Subjects
HCPV
Fresnel lens
geometric concentration ratio
SDGs
Type
thesis
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