This work deals with a numerical parametric optimization study of a new Solar Flat Air Collector (SFAC) configuration. The CFD numerical parametric study investigates various SFAC structures inside the air cavity without obstacles and with spherical, cubic, cylindrical, and pyramidal obstacles. The study optimizes the most convenient configuration and arrangement that allow for the increase of the heat-transfer surface and to make the flow homogeneous in order to generate turbulence zones inside the SFAC air cavity. The result shows that the thermal performances of the cubic form are close to those of the spherical obstacles. Another set of simulations was performed to evaluate the performances of the cubic shape baffles for three orientation angles equal to 0°, 22.5°, and 45°, respectively. Each configuration has three forms of arrangement with a relative roughness pitch (b/a) varying between 2, 4, and 6. The results of the simulation study showed that the relative roughness pitch, the Reynolds number, as well as the angle of orientation influence the performance and the operation of the SFAC. The results of the simulations showed that the combination of an orientation of 45° with a roughness pitch of b/a = 2 increases the SFAC thermal performances, which can reach 85%.

中文翻译：

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新型太阳能平板集气器不同障碍物配置和布置的CFD数值研究

这项工作涉及对新型太阳能平板空气收集器 (SFAC) 配置的数值参数优化研究。CFD 数值参数研究研究了空气腔内的各种 SFAC 结构，没有障碍物，有球形、立方体、圆柱形和金字塔形障碍物。该研究优化了最方便的配置和布置，允许增加传热表面并使流动均匀，以便在 SFAC 气腔内产生湍流区。结果表明，立方体的热性能与球形障碍物的热性能接近。进行另一组模拟以评估立方形挡板在三个取向角分别等于 0°、22.5° 和 45° 时的性能。每种配置都有三种排列形式，相对粗糙度节距 (b/a) 在 2、4 和 6 之间变化。 模拟研究的结果表明，相对粗糙度节距、雷诺数以及取向角影响 SFAC 的表现和运作。模拟结果表明，45°的取向与b/a = 2的粗糙度间距的组合提高了SFAC热性能，可以达到85%。