Enhancing thermal performance and reducing entropy generation rate in evacuated tube solar air heaters with inserted baffle plate using static mixers: A CFD-RSM analysis

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI:10.1016/j.tsep.2024.103012

Moslem Abrofarakh, Hamid Moghadam

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引用次数: 0

Abstract

Evacuated tube collector solar air heaters with an inserted baffle (ETCSAH-IB) have gained attention due to their applicability in various applications and their use of solar energy for clean and sustainable heating. In this study, the effect of incorporating a static mixer (SM) into the ETCSAH-IB (ETCSAH-IBSM) on thermal performance and entropy generation rate (EGR) was investigated using computational fluid dynamics (CFD) and Response Surface Methodology (RSM) approaches (CFD-RSM), with the aim of device performance enhancement. The twist angle and blade thickness were considered as characteristic parameters of the static mixer. The study investigated the thermal performance and EGR of the ETCSAH-IBSM with variations in Reynolds numbers, SM twist angles, and SM blade thicknesses. The results demonstrated that thermal performance and total EGR of the ETCSAH-IBSM increased with Reynolds number, twist angles, and blade thickness of the SM. Additionally, under maximum conditions, the thermal performance of the ETCSAH-IBSM exceeded that of the ETCSAH-IB by 490 %. Furthermore, integrating the SM into the ETCSAH-IB resulted in a notable 77 % reduction in total EGR. These results were obtained only by a pressure drop of about 140 Pa. Achieving these results by embedding a static mixer inside the ETCSAH-IB is presented as the novelty of this study. Finally, optimization was carried out using RSM to maximize thermal performance and minimize pressure drop of the ETCSAH-IBSM. The optimized values suggested a Reynolds number near 10000, a blade thickness near 4 mm, and a twist angle of 60 degrees.

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使用静态混合器提高带插入式挡板的真空管太阳能空气加热器的热性能并降低熵产生率：CFD-RSM 分析

带插入式挡板的蒸发管集热器太阳能空气加热器（ETCSAH-IB）因其在各种应用中的适用性以及利用太阳能实现清洁和可持续供热而备受关注。本研究采用计算流体动力学（CFD）和响应面方法学（RSM）（CFD-RSM）研究了在 ETCSAH-IB （ETCSAH-IBSM）中加入静态混合器（SM）对热性能和熵生成率（EGR）的影响，目的是提高设备性能。扭转角和叶片厚度被视为静态混合器的特征参数。研究调查了 ETCSAH-IBSM 在雷诺数、SM 扭转角和 SM 叶片厚度变化时的热性能和 EGR。结果表明，ETCSAH-IBSM 的热性能和总 EGR 随雷诺数、SM 扭转角和 SM 叶片厚度的变化而增加。此外，在最大条件下，ETCSAH-IBSM 的热性能比 ETCSAH-IB 高出 490%。此外，将 SM 集成到 ETCSAH-IB 中还显著减少了 77% 的总 EGR。这些结果仅仅是在压力下降约 140 Pa 的情况下取得的。通过在 ETCSAH-IB 内部嵌入静态混合器来实现这些结果是本研究的新颖之处。最后，使用 RSM 进行了优化，以最大限度地提高 ETCSAH-IBSM 的热性能并最小化压降。优化值建议雷诺数接近 10000，叶片厚度接近 4 毫米，扭转角为 60 度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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