Design and Principles of a Novel Linear Solar Concentrator With Asymmetric Parabolic Reflector and Independently Movable Receiver: Sensitivity Analysis of Optical Efficiency to Deviations

Abstract

Abstract. We put forward a novel linear solar concentrator featuring an asymmetric parabolic reflector and an independently movable receiver, and conducts an initial exploration into the feasibility of this new concentrator across different seasons and geographical regions worldwide. On this basis, this study systematically examines the effects of various deviations on the optical performance of fixed-reflector parabolic concentrators. Based on ray-tracing simulations, a comprehensive analytical method for evaluating deviation effects was developed. This method quantifies the influence of key parameters—including reflector angle and surface profile deviations, tracker angle deviations, receiver position deviations, and concentrator orientation deviations—on the geometric optical efficiency. This methodology was applied to analyze two representative design cases, employing contour maps to illustrate optical efficiency variations under different deviation conditions and defining permissible deviation ranges corresponding to various efficiency thresholds. Building upon this, recommended control metrics for various deviations are proposed, alongside optimization strategies—such as adjusting the receiver position or modifying the tracking model—to enhance the system's tolerance capability. Findings indicate that the recommended deviation control metrics for this concentrator are lower than the existing standards for linear concentrators, and as the aspect ratio of the concentrator decreases, its tolerance capability improves, while the peak efficiency decreases. This study provides data references for the design, application, and optimization of fixed-reflector parabolic concentrators and also offers a reference for the analysis of other solar concentrating methods and optical engineering.