As a line-focus concentrating solar power (CSP) technology, linear Fresnel collectors have the potential to become a low-cost solution for electricity production and a variety of thermal energy applications. However, this technology often suffers from relatively low performance. A secondary reflector is a key component used to improve optical performance of a linear Fresnel collector. The shape of a secondary reflector is particularly critical in determining solar power captured by the absorber tube(s), and thus, the collector’s optical performance. However, to the authors’ knowledge, no well-established process existed to derive the optimal secondary shape prior to the development of a new adaptive method to optimize the secondary reflector shape. The new adaptive method does not assume any pre-defined analytical form; rather, it constitutes an optimum shape through an adaptive process by maximizing the energy collection onto the absorber tube. In this paper, the adaptive method is compared with popular secondary-reflector designs with respect to a collector’s optical performance under various scenarios. For the first time, a comprehensive, in-depth comparison was conducted on all popular secondary designs for CSP applications. It is shown that the adaptive design exhibits the best optical performance.

作为线聚焦聚光太阳能（CSP）技术，线性菲涅尔收集器有潜力成为电力生产和各种热能应用的低成本解决方案。但是，该技术经常遭受相对较低的性能。辅助反射器是用于改善线性菲涅耳收集器的光学性能的关键组件。辅助反射器的形状对于确定由吸收器管捕获的太阳能，从而确定收集器的光学性能特别重要。然而，据作者所知，在开发新的自适应方法来优化次反射器形状之前，尚不存在完善的过程来得出最佳次要形状。新的自适应方法不采用任何预定义的分析形式。相当，通过最大程度地吸收到吸收管上的能量，它通过自适应过程形成了最佳形状。在本文中，就各种情况下的收集器的光学性能而言，将自适应方法与流行的辅助反射器设计进行了比较。第一次，针对CSP应用程序中所有流行的辅助设计进行了全面，深入的比较。结果表明，自适应设计具有最佳的光学性能。对所有用于CSP应用的流行辅助设计进行了深入比较。结果表明，自适应设计具有最佳的光学性能。对所有用于CSP应用的流行的二次设计进行了深入比较。结果表明，自适应设计具有最佳的光学性能。