- 學位論文
平板式太陽能菲涅爾集光透鏡與二次光學元件之設計與分析
Design and Analysis of Flat Fresnel Solar Concentrator with Secondary Optical Element
摘要
本研究透過菲涅爾透鏡初階設計公式，使用光學分析軟體ASAP建構菲涅爾透鏡之光學模型，探討其光學特性，包含輻射照度、輻射通量與容忍角度等，並使用邊緣光線設計二次光學元件與菲涅爾透鏡互相搭配，其主要目的：(1)降低太陽偏差角度所造成地能量損失；(2)使能量分佈均勻，有效提升模組效益，減少發電成本。 因此，藉由邊緣光線理論設計三種不同型式的二次光學元件搭配菲涅爾透鏡改善上述情形，利用光學模擬及參數式最佳化方式來優化二次光學元件參數設計方法，計算一組最佳的設計參數。本研究亦探究在全光譜與組裝誤差因素下對集光器之集光特性影響程度。 因溫度變化將影響透鏡幾何結構以及介質折射率，本論文亦利用有限元素分析軟體ANSYS進行菲涅爾透鏡熱變形分析，將變形後的菲涅爾透鏡資料輸出，匯入光學軟體進行分析，了解溫度對菲涅爾透鏡之集光特性影響程度。
並列摘要
This study presents the design of solar concentrator for Concentrated Photovoltaic (CPV) system. Firstly, the flat Fresnel lens model was constructed by Fresnel lens formula. The optical performance of the Fresnel lens under variations of prism pitches and the position of the solar cell were analyzed by ray tracing software ASAP. The simulation results showed that the acceptance angles and energy distribution of the Fresnel lens were not good enough. To improve the aforementioned drawback, different secondary optical elements (SOEs) designed by edge ray principle were proposed with the Fresnel lens. Parameter method is also applied with the optical simulations in order to find the best SOE design parameters. The two main influences of temperature variation on the Fresnel lens are change of index of refraction and thermal deformation of the Fresnel prisms. The thermal deformation of the Fresnel lens was analyzed by finite element method (FEM). The deformed lens geometry determined from FEM was imported into ray tracing simulation to investigate the effects of temperature variations on the Fresnel lens.