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Optimization of heliostat field layout in solar central receiver systems on annual basis using differential evolution algorithm

机译：使用差分进化算法逐年优化太阳中央接收器系统中的定日镜场布局

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摘要

Optimization of a heliostat field is an essential task to make a solar central receiver system effective because major optical losses are associated with the heliostat fields. In this study, a mathematical model was developed to effectively optimize the heliostat field on annual basis using differential evolution, which is an evolutionary algorithm. The heliostat field layout optimization is based on the calculation of five optical performance parameters: the mirror or the heliostat reflectivity, the cosine factor, the atmospheric attenuation factor, the shadowing and blocking factor, and the intercept factor. This model calculates all the aforementioned performance parameters at every stage of the optimization, until the best heliostat field layout based on annual performance is obtained. Two different approaches were undertaken to optimize the heliostat field layout: one with optimizing insolation weighted annual efficiency and the other with optimizing the un-weighted annual efficiency. Moreover, an alternate approach was also proposed to efficiently optimize the heliostat field in which the number of computational time steps was considerably reduced. It was observed that the daily averaged annual optical efficiency was calculated to be 0.5023 as compared to the monthly averaged annual optical efficiency, 0.5025. Moreover, the insolation weighted daily averaged annual efficiency of the heliostat field was 0.5634 for Dhahran, Saudi Arabia. The code developed can be used for any other selected location. (C) 2015 Elsevier Ltd. All rights reserved.
机译：定日镜场的优化是使太阳能中央接收器系统有效的基本任务，因为主要的光学损耗与定日镜场有关。在这项研究中，开发了一个数学模型，以使用差分进化算法有效地逐年优化定日镜场，这是一种进化算法。定日镜场布局优化基于五个光学性能参数的计算：反射镜或定日镜反射率，余弦因子，大气衰减因子，阴影和阻挡因子以及拦截因子。该模型会在优化的每个阶段计算所有上述性能参数，直到获得基于年度性能的最佳定日镜场布局为止。采取了两种不同的方法来优化定日镜的场布局：一种方法是优化日照加权年效率，而另一种方法是优化非加权年效率。此外，还提出了另一种方法来有效地优化定日镜场，其中大大减少了计算时间步数。观察到，与月平均年光学效率0.5025相比，日平均年光学效率被计算为0.5023。此外，沙特阿拉伯达兰的定日镜场的日照加权日平均年效率为0.5634。开发的代码可用于任何其他选定位置。 （C）2015 Elsevier Ltd.保留所有权利。

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