The sun is an abundantly available and clean renewable energy source. Therefore, solar energy offers significant potential for mitigating climate change and reducing emissions from burning fossil fuels in the future. Solar chimney power plants (SCPPs) have a technical capability for meeting the massive sustainable power production. Basic parts of SCPP system are the chimney, turbine, and collector. The geometric dimensions of the components are the crucial factors for improving the solar chimney efficiency. The goal of this work is to analyse the influences of the inclination angle () at chimney inlet on performance characteristics of the system by employing RNG turbulence model coupled with discrete ordinate (DO) solar ray tracing method via ANSYS Fluent CFD software. The model is built by taking into consideration geometric parameters of Manzanares plant and verified with its measurements. The innovative chimney entrance configurations are produced by altering the chimney entrance slope (^°–80^°) with the geometrical dimensions of the chimney, collector, and fillet keeping constant. The computational results display that the new chimney configurations improve the maximum velocity, system power output, and turbine pressure drop. The peak velocity of 18.1 m/s is gained for the configuration with ^° compared to that of 14.3 m/s obtained for the base model having ^° at 1000 W/m². Besides, this configuration enhances power output to 61.5 kW with a rise of 24.5% compared to the base model with a power output of 49.1 kW at 1000 W/m².

中文翻译：

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通过3D CFD模型研究烟囱入口倾角对太阳能烟囱电站发电量的影响

太阳是一种丰富且清洁的可再生能源。因此，太阳能为缓解气候变化和减少未来燃烧化石燃料的排放提供了巨大的潜力。太阳能烟囱发电厂（SCPP）具有满足大规模可持续电力生产的技术能力。SCPP系统的基本部分是烟囱、涡轮机和集热器。组件的几何尺寸是提高太阳能烟囱效率的关键因素。这项工作的目标是通过 ANSYS Fluent CFD 软件采用 RNG 湍流模型与离散纵坐标 (DO) 太阳光线追踪方法相结合，分析烟囱入口处的倾角 ( )对系统性能特性的影响。该模型的建立考虑了曼萨纳雷斯工厂的几何参数，并通过测量进行了验证。创新的烟囱入口配置是通过改变烟囱入口坡度产生的（^° –80 ^°），烟囱、集热器和圆角的几何尺寸保持恒定。计算结果表明，新的烟囱配置提高了最大速度、系统功率输出和涡轮机压降。配置的峰值速度为 18.1 m/s^°与基础模型获得的 14.3 m/s 相比^° 1000 W/m ²时。^{此外，该配置将功率输出提升至61.5 kW，较基础车型（1000 W/m 2}时的功率输出49.1 kW）提升了24.5% 。