Performance evaluation of composite phase change materials with varying expanded graphite content in a drawer-type latent heat storage tank

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.2024.102970

Jiwei Fang, Yingling Cai, Tingting Deng

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Abstract

The poor thermal conductivity of single-component phase change materials (PCMs) significantly impacts the operational efficiency of solar combi-systems. There is still a gap in the research on the heat release behavior of composite phase change materials (CPCMs). Therefore, this study investigated the heat release behavior of a self-developed drawer-type heat storage tank by varying the content of expanded graphite (EG) in the CPCMs used in it. Simulation was carried out using COMSOL Multiphysics 6.1, followed by experimentation on a test bench. The average outflow temperature, effective energy conversion (EEC), and heat release rate were used to evaluate the performance of the tanks. Comparing the simulation with experimental results, a maximum error of 8.75 % was obtained, indicating the accuracy of the study. The results indicate that adding EG can significantly improve the thermal conductivity of CPCM, with superior heat release behavior observed when the mass fraction of EG reaches 5 %. Under similar temperatures, the average outflow temperature from a 5 % EG tank is approximately 4.4 °C higher, EEC is 84 % higher, and heat release rate is 1.63 times higher than that from an ordinary thermal tank. Under different temperatures in a 5 % EG tank, increasing by 5 °C results in an average outflow temperature increase of 4.1 °C, EEC increase by a factor of one and an increase in heat release rate by 36 %. This study provides valuable insights for subsequent research on operation strategies for solar combined systems.

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抽屉式潜热蓄热器中不同膨胀石墨含量的复合相变材料的性能评估

单组分相变材料（PCM）的导热性较差，严重影响了太阳能组合系统的运行效率。关于复合相变材料（CPCMs）热释放行为的研究仍是空白。因此，本研究通过改变 CPCMs 中膨胀石墨（EG）的含量，研究了自主开发的抽屉式蓄热箱的热释放行为。研究使用 COMSOL Multiphysics 6.1 进行了模拟，随后在试验台上进行了实验。平均流出温度、有效能量转换（EEC）和热释放率被用来评估储气罐的性能。将模拟结果与实验结果进行比较，得出的最大误差为 8.75%，这表明研究结果是准确的。结果表明，添加 EG 可显著改善 CPCM 的导热性，当 EG 的质量分数达到 5 % 时，可观察到其卓越的热释放性能。在类似温度下，5% EG 罐的平均流出温度比普通保温罐高约 4.4 °C，EEC 高 84 %，热释放率是普通保温罐的 1.63 倍。在 5 % EG 储罐的不同温度下，温度升高 5 °C，流出温度平均升高 4.1 °C，EEC 增加 1 倍，热释放率增加 36 %。这项研究为后续研究太阳能组合系统的运行策略提供了有价值的见解。

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

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.