Abstract The most promising collector must achieve the best thermal efficiency and fill out high requirements of low weight, low power consumption, ease of manufacturing, and low cost. In this study; a novel efficiently optimized flat plate solar air collector is modeled with a selective absorber and three rows of rectangular fins installed beneath the structure that provides 81% of thermal efficiency and 0.5 W of pumping power. A three dimensional CFD model of a flat plate solar air collector is developed and solved in steady-state conditions. We propose a suitable approach for assessing and optimizing a 1.28 m2 surface collector’s performance with forced convection flow. Results indicate that additional fin rows (from 35 rows to 142 rows) and fins relative height (0.5 to 0.8) with a nonselective absorber increase the thermal performance from 63% to 80%, and additional turbulent flow causes an increase of pump power from 1.8 W to 16 W. The adoption of a selective absorber contributes to efficiency 5% higher than that of a collector with 35 rows of fin for a volume flow of 85.33 m3/hm2. In contrast, the gain achieved by adding 142 rows of fin (l’/L=0.006) remains the most important, where it leads to an effective efficiency of 79.2% for a volume flow rate of 85.33 m3/hm2. Thus, it has been proposed to combine the selective absorber with the addition of rectangular fins in the new design.

中文翻译：

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成排矩形翅片太阳能集热器数值分析

摘要 最有前途的集热器必须达到最佳的热效率，并满足轻量化、低功耗、易于制造和低成本的高要求。在这项研究中; 新型高效优化的平板太阳能空气收集器采用选择性吸收器和安装在结构下方的三排矩形翅片进行建模，可提供 81% 的热效率和 0.5 W 的泵送功率。在稳态条件下开发和求解平板太阳能空气收集器的三维 CFD 模型。我们提出了一种合适的方法来评估和优化具有强制对流的 1.28 平方米表面集热器的性能。结果表明，额外的鳍行（从 35 行到 142 行）和鳍的相对高度（0.5 到 0. 8) 使用非选择性吸收器将热性能从 63% 提高到 80%，额外的湍流导致泵浦功率从 1.8 W 增加到 16 W。采用选择性吸收器有助于提高效率 5%带有 35 排翅片的集热器，体积流量为 85.33 m3/hm2。相比之下，通过添加 142 排翅片 (l'/L=0.006) 获得的增益仍然是最重要的，对于 85.33 m3/hm2 的体积流量，它导致 79.2% 的有效效率。因此，有人提议在新设计中将选择性吸收器与添加矩形翅片相结合。33 立方米/公顷。相比之下，通过添加 142 排翅片 (l'/L=0.006) 获得的增益仍然是最重要的，对于 85.33 m3/hm2 的体积流量，它导致 79.2% 的有效效率。因此，有人提议在新设计中将选择性吸收器与添加矩形翅片相结合。33 立方米/公顷。相比之下，通过添加 142 排翅片 (l'/L=0.006) 获得的增益仍然是最重要的，对于 85.33 m3/hm2 的体积流量，它导致 79.2% 的有效效率。因此，有人提议在新设计中将选择性吸收器与添加矩形翅片相结合。