The optical analysis of Linear Fresnel Reflectors solar concentrators deals with the calculation of the absorbed flux at the receiver. Due to concentrator discrete and complex geometry ray tracing numerical simulations is the main used method, in parallel with some analytical approaches that have been developed for specific cases. This paper presents an analytical method for Linear Fresnel Reflectors with a flat receiver. It is based on Zhu’s vector-based method and Rabl’s concepts of acceptance and effective source, although new shading (including receiver shading), blocking, and cosine losses analyzes are presented, with the inclusion of end-losses effect. As shown, the problem is better described by the concept of intercept factor, the effective aperture area used to collect the incident sunlight. Comparison tests with ray tracing simulations performed in SolTrace for three different effective sources were carried out to validate the analytical model for both factorized and biaxial models of the intercept factor, including energetic evaluations for Évora, Portugal. In general, analytical results do agree very well with ray tracing, better for the factorized model than the biaxial. Errors in the analytical estimative of intercept factor can be high up to 132% for the biaxial model at high longitudinal incidence angles; on the other hand, errors in the amount of annual absorbed energy were high up to only 3%.

线性菲涅耳反射器太阳能聚光器的光学分析处理接收器处吸收通量的计算。由于集中器离散和复杂的几何形状，射线追踪数值模拟是主要使用的方法，同时还有一些针对特定情况开发的分析方法。本文提出了一种带有平面接收器的线性菲涅耳反射器的分析方法。它基于 Zhu 的基于矢量的方法和 Rabl 的接受和有效源的概念，尽管提出了新的着色（包括接收器着色）、阻塞和余弦损耗分析，包括端部损耗效应。如图所示，截距因子的概念可以更好地描述该问题，即用于收集入射阳光的有效孔径面积。在 SolTrace 中对三种不同的有效源进行了光线追踪模拟的比较测试，以验证截距因子的分解和双轴模型的分析模型，包括对葡萄牙埃武拉的能量评估。一般来说，分析结果与光线追踪非常吻合，分解模型比双轴模型更好。对于高纵向入射角的双轴模型，截距因子的分析估计误差可能高达 132%；另一方面，年吸收能量的误差高达 3%。分析结果与光线追踪非常吻合，分解模型比双轴模型更好。对于高纵向入射角的双轴模型，截距因子的分析估计误差可能高达 132%；另一方面，年吸收能量的误差高达 3%。分析结果与光线追踪非常吻合，分解模型比双轴模型更好。对于高纵向入射角的双轴模型，截距因子的分析估计误差可能高达 132%；另一方面，年吸收能量的误差高达 3%。