{"title":"Influence of pitch and height of pentagonal ribbed absorber plate of solar air heater for performance enhancement with environmental analysis","authors":"","doi":"10.1016/j.tsep.2024.103035","DOIUrl":null,"url":null,"abstract":"<div><div>Installation of corrugations on the absorber plate of a solar air heater (SAH) improves its performance. Pentagonal ribs were used as artificial corrugations on the SAH absorber, which is used in an indirect solar dryer. The impact of Reynolds number, <em>Re</em> (4000–22000), corrugation pitch, <em>P</em> (25–200 mm), corrugation height, <em>e</em> (4–20 mm), and corrugation angle, <em>α</em> on the performance of SAH was analyzed by estimating the Nusselt number (<em>Nu</em>), friction factor (<em>f</em>), <em>Nu</em> ratio, <em>f</em> ratio, and thermo-fluidic enhancement index (<em>E<sub>tf</sub></em>). Seventeen models were generated in ANSYS DesignModeler. 133 simulations were performed to obtain the optimum pitch (set-1 and 3 simulations) and the optimum height (set-2 simulations) values. Environmental analysis of the SAH was performed by computing the energy payback period (<em>E<sub>pb</sub></em>), and CO<sub>2</sub> mitigation for a lifetime of 20 years. The <em>Nu</em> increased and the <em>f</em> fell with a rise in <em>Re</em> value. Compared to smooth SAH, the pentagonal ribbed SAH produced a 60–149 % increase in <em>Nu</em>. The highest <em>E<sub>tf</sub></em> of 1.839 was obtained at <em>P</em> = 25 mm, <em>e</em> = 7 mm. The proposed optimal dimensions of the pentagonal rib are; <em>e</em> = 7 mm (<em>e</em>/<em>D</em> = 0.05), <em>P</em> = 25 mm (<em>P</em>/<em>e</em> = 3.57), and corrugation angle, <em>α</em> = 18.64°. The <em>E<sub>pb</sub></em> and CO<sub>2</sub> mitigation are 0.174 years and 57.34 tons, respectively. A comparison of the results with the literature data showed that the present results are acceptable.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S245190492400653X","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Installation of corrugations on the absorber plate of a solar air heater (SAH) improves its performance. Pentagonal ribs were used as artificial corrugations on the SAH absorber, which is used in an indirect solar dryer. The impact of Reynolds number, Re (4000–22000), corrugation pitch, P (25–200 mm), corrugation height, e (4–20 mm), and corrugation angle, α on the performance of SAH was analyzed by estimating the Nusselt number (Nu), friction factor (f), Nu ratio, f ratio, and thermo-fluidic enhancement index (Etf). Seventeen models were generated in ANSYS DesignModeler. 133 simulations were performed to obtain the optimum pitch (set-1 and 3 simulations) and the optimum height (set-2 simulations) values. Environmental analysis of the SAH was performed by computing the energy payback period (Epb), and CO2 mitigation for a lifetime of 20 years. The Nu increased and the f fell with a rise in Re value. Compared to smooth SAH, the pentagonal ribbed SAH produced a 60–149 % increase in Nu. The highest Etf of 1.839 was obtained at P = 25 mm, e = 7 mm. The proposed optimal dimensions of the pentagonal rib are; e = 7 mm (e/D = 0.05), P = 25 mm (P/e = 3.57), and corrugation angle, α = 18.64°. The Epb and CO2 mitigation are 0.174 years and 57.34 tons, respectively. A comparison of the results with the literature data showed that the present results are acceptable.
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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