Research on Optical Design for the Solar Concentrated System with Fresnel lens Structures

• Main Authors: Ji-Fan Chen, 陳紀帆
• Other Authors: Der-Ray Haung
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/23474125349853106694

碩士 === 國立東華大學 === 光電工程學系 === 101 === The optical design of concentrated system using optical components to collect sunlight and transfer high energy to a M-J solar receiver is a key technology to achieve high conversion efficiency. It possesses the potential to reduce system cost while keeping high conversion efficiency. The effect of concentrated spots and non-uniform exposure is often overlooked. Generally, improvements on the concentrator photovoltaic (CPV) system are focused on the concentration rate and optical efficiency. In this study, we use a secondary optical element (SOE) on the concentrated system of M-J solar cell to improve the uniformity and efficiency. The advantage of SOE is that it provides good uniformity in light exposure which enhances conversion efficiency. The optical structure of concentrated systems with Fresnel lens and SOE is designed by using optical software TracePro for simulation. The result of optical simulation shows the improved uniformity of illuminance on solar receiver is from 8.3% to 66.6%. The optical efficiencies of Fresnel lens without and with SOE under 1° of acceptance angle are 12.14% and 53.7% respectively. The improvement of fill factor (FF) for CPV solar cell is from 50.65% to 70.69%, and the conversion efficiency is from 30.96 to 38.8%. It will be helpful for CPV applications.