{"title":"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","authors":"Moslem Abrofarakh, Hamid Moghadam","doi":"10.1016/j.tsep.2024.103012","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"55 ","pages":"Article 103012"},"PeriodicalIF":5.1000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"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\",\"authors\":\"Moslem Abrofarakh, Hamid Moghadam\",\"doi\":\"10.1016/j.tsep.2024.103012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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. 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引用次数: 0
摘要
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。
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
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.
期刊介绍：
Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.
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