Accelerated charging and discharging of a thermal energy storage system with multiwalled carbon nanotube – Adipic acid composites

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-09-30 DOI:10.1016/j.icheatmasstransfer.2025.109739

Adhithyaa L.K. , Subin J. , Venkatesh M. , Hari Suthan V., Jeyaprakash T., Santosh Srinivas N., Suganthi K.S., Rajan K.S.

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Abstract

Adipic acid functions as a thermal energy storage material possessing the latent heat storage density of ∼290 kJ/kg, with very little supercooling. The rate performance during the charging and discharging of thermal energy is impacted by its low thermal conductivity, which can be improved through the inclusion of high thermal conductivity and high-aspect ratio nanostructures. Multiwalled carbon nanotube - adipic acid nanocomposite was prepared using sulphuric acid-treated multiwalled carbon nanotubes (SA-MWCNT) at the concentrations of 0.1 and 0.2 wt%. The thermal conductivity measurements revealed the SA-MWCNT-adipic acid composite with 0.1 wt% SA-MWCNT to possess 16 % enhancement in thermal conductivity. The time duration required for melting of 0.1 wt% SA-MWCNT-adipic acid was reduced by 31 %, in comparison with that required for adipic acid. Also, 0.1 wt% SA-MWCNT-adipic acid composite required 32 % lower duration for release of the stored latent heat when cooled by a well-mixed liquid. The presence of SA-MWCNT in the composite contributed to improved kinetics for sensible heat energy storage also by amplifying the overall heat transfer coefficient by 35 % and 31 % during the solid phase heating and cooling cycles. This composite exhibited high stability after 250 thermal cycles relative to adipic acid. Hence, this SA-MWCNT-adipic acid composite is a suitable alternative to adipic acid in thermal energy storage systems for steam generation and water heating at elevated pressures.

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多壁碳纳米管-己二酸复合材料蓄热系统的加速充放电

己二酸作为一种储热材料，其潜热储存密度为~ 290 kJ/kg，过冷性很小。热导率低影响其充放电过程中的速率性能，可通过加入高热导率和高纵横比的纳米结构来改善。采用浓度为0.1 wt%和0.2 wt%的硫酸处理多壁碳纳米管（SA-MWCNT）制备了多壁碳纳米管-己二酸纳米复合材料。热导率测量表明，SA-MWCNT-己二酸复合材料含有0.1 wt%的SA-MWCNT，热导率提高16%。与己二酸相比，熔化0.1 wt% sa - mwcnts -己二酸所需的时间缩短了31%。此外，0.1 wt%的sa - mwcnt -己二酸复合材料在被充分混合的液体冷却时，释放储存的潜热所需的时间缩短了32%。在固相加热和冷却循环中，SA-MWCNT的存在也通过将总传热系数提高35%和31%，改善了复合材料的显热储能动力学。相对于己二酸，该复合材料在250个热循环后表现出较高的稳定性。因此，这种sa - mwcnt -己二酸复合材料是用于蒸汽产生和高压水加热的热能储存系统中己二酸的合适替代品。

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

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.