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本文针对具有多管梯形腔式吸热器的线性菲涅尔(LFR)系统及其光能聚集与光热转换复杂过程,提出了一种基于蒙特卡罗光线追迹法(MCRT)和有限容积法(FVM)的三维MCRT-FVM光热耦合计算方法。该耦合方法采用MCRT计算系统光能聚集过程,而采用FVM计算吸热器内的光热转换过程,同时两种方法在吸热器内进行耦合,从而实现了对系统光能聚集与光热转换过程的直接研究。在此基础上,采用该方法进一步分析了系统光学性能、吸热器温度特性以及系统光热转化性能。研究结果表明,该方法具有较高的准确性和可靠性,可实现对LFR系统聚光与光热转换性能的直接研究与预测,所获得的系统性能参数可进一步指导LFR系统的设计和性能优化。
In this paper, a linear Fresnel (LFR) system with multi-trapezoidal cavity heat sink and its process of light energy accumulation and photothermal conversion are presented. Based on the Monte Carlo Ray Tracing Method (MCRT) and finite volume Method (FVM) three-dimensional MCRT-FVM method for the calculation of solar thermal coupling. The coupling method uses the MCRT to calculate the light energy accumulation process of the system, and the FVM is used to calculate the light-to-heat conversion process in the heat absorber, and the two methods are coupled in the heat absorber to realize the system of light energy aggregation and light-heat conversion Direct study of the process. On this basis, this method is used to further analyze the optical properties of the system, the temperature characteristics of the absorber and the system photothermal conversion performance. The results show that this method has high accuracy and reliability and can directly research and predict the performance of LFR system. The obtained system performance parameters can further guide the design and performance optimization of LFR system .