Enhancing thermal performance of solar air heater using graphene nano coatings: A comparative study with and without baffles

IF 5.4 3区工程技术 Q2 ENERGY & FUELS Thermal Science and Engineering Progress Pub Date : 2025-04-01 Epub Date: 2025-03-12 DOI:10.1016/j.tsep.2025.103498

C.Balakrishna Moorthy , K. Dilip kumar , R. Vijayakumar , P. Madhu

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Abstract

This study examines how effectively solar air heaters (SAH) work when various absorber plate coatings are applied. For this, different absorber plate proportions of graphene Nano coatings are used with SAH with and without baffles. Several experiments are carried out, and the results are compared for SAH with and without baffles. These included black paint coating (Case 1), 1 wt% graphene Nanoplatelets (GNP’s) dispersed black paint (Case 2), 2 wt% GNP’s dispersed black paint (Case 3), 1 wt% graphene dispersed acrylic paint & black paint (Case 4), 2 wt% graphene dispersed acrylic paint & black paint (Case 5), 1 wt% graphene dispersed acrylic paint 1 wt% graphene in black paint (Case 6), 1 wt% graphene dispersed acrylic paint & 2 wt% graphene in black paint (Case 7), 2 wt% graphene dispersed acrylic & 1 wt% graphene in black paint (Case 8), and 2 wt% graphene dispersed acrylic & 2 wt% graphene in black paint (Case 9). The case with the highest thermal performance among all the cases examined is the one with 2 wt% graphene dispersed in acrylic and 2 wt% graphene in black paint (Case 9). Compared to other cases studied for SAH with and without baffles, case 9′s SAH with baffles produces a maximum average efficiency of 83.8 %. With the same configuration, the maximum average useful heat gains of 700.4 W and the maximum thermos-hydraulic performance parameter of 1.97 are achieved. Compared to others, the superior thermal characteristics and high graphene concentration in the SAH absorber exhibit superior thermal performance.

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利用石墨烯纳米涂层增强太阳能空气加热器的热性能：带挡板和不带挡板的比较研究

本研究考察了当应用各种吸收板涂层时，太阳能空气加热器（SAH）的工作效率。为此，不同的吸收板比例的石墨烯纳米涂层与带和不带挡板的SAH一起使用。进行了多次实验，并对有挡板和无挡板的SAH进行了比较。这些包括黑色涂料（案例1），1 wt%石墨烯纳米片（GNP）分散黑色涂料（案例2），2 wt% GNP分散黑色涂料（案例3），1 wt%石墨烯分散丙烯酸涂料和；黑色涂料（案例4），2 wt%石墨烯分散丙烯酸涂料；黑色涂料（案例5），1wt %石墨烯分散丙烯酸涂料（案例6），1wt %石墨烯分散丙烯酸涂料；2 wt%石墨烯黑色涂料（案例7），2 wt%石墨烯分散丙烯酸；1 wt%石墨烯黑色涂料（案例8）和2 wt%石墨烯分散丙烯酸；2 wt%石墨烯在黑色涂料中（案例9）。在所有研究的案例中，热性能最高的案例是将2 wt%石墨烯分散在丙烯酸中，将2 wt%石墨烯分散在黑色涂料中（案例9）。与其他有挡板和没有挡板的SAH研究案例相比，案例9中有挡板的SAH的最高平均效率为83.8%。在相同配置下，最大平均有效热增益为700.4 W，最大热水力性能参数为1.97。与其他材料相比，优异的热特性和高石墨烯浓度的SAH吸收剂表现出优异的热性能。

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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

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.