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Influence of the collector concavity on the airflow behavoir within solar chimney power plant

机译：收集器凹陷对太阳能烟囱发电厂气流行为的影响

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摘要

Solar Chimney Power Plant (SCPP) is a large-scale system which is designed to produce electricity from the solar energy. This thermal device is characterized by a high investment cost and a low thermodynamic efficiency. The optimization of these thermal systems is required. The solar collector is one of the important parts of the solar chimney power plant. The collector is considered as a heat generator by using the greenhouse effect. In this paper, a novel design of the collector is proposed in order to increase the overall efficiency of the SCPP. In fact, impact of the collector concavity on the system performance is studied. Using CFD method, two-dimensional steady simulations were performed while varying the concavity ratio of the collector (CC). The specific ratio is defined as the curvature radius of the collector roof divided by the collector radius. The airflow behavior is examined by analyzed the static temperature, the magnitude velocity, the static pressure and the overall percentage of the power output rise. The numerical simulations were validated using experimental data gathered from a small prototype build at the National School of Engineers of Sfax, Tunisia. The predicted outcomes showed that a concave collector could enhance the overall performance of the solar chimney power plant.
机译：太阳能烟囱发电厂（SCPP）是一种大型系统，旨在从太阳能产生电力。该热装置的特点是高投资成本和低热力学效率。需要优化这些热系统。太阳能收集器是太阳能烟囱发电厂的重要部分之一。通过使用温室效应将收集器视为发热器。本文提出了一种集电器的新颖设计，以提高SCPP的整体效率。事实上，研究了收集器凹陷对系统性能的影响。使用CFD方法，执行二维稳定模拟，同时改变收集器（CC）的凹面比。具体比率定义为集电屋顶的曲率半径除以集电极半径。通过分析静态温度，幅度速度，静压和功率输出升高的总体百分比来检查气流行为。使用在突尼斯的SFAX工程师学院的小型原型构建收集的实验数据验证了数值模拟。预测的结果表明，凹形收集器可以提高太阳能烟囱发电厂的整体性能。

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