利用离子液体/石墨烯复合材料进行吸附蓄热的材料级实验研究

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.2024.102955

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引用次数: 0

摘要

吸附蓄热技术因其先进的蓄热能力，最近引发了越来越多的关注。然而，材料层面的传热和传质难题依然存在。这项研究开发了新型吸附复合材料，将离子液体（1-乙基-3-甲基咪唑鎓甲烷磺酸盐和 1-乙基-3-甲基咪唑鎓氯化物）浸渍在 1-5 层二维石墨烯主基体中，为该领域做出了贡献。以水和乙醇为吸附剂，对它们的吸附、传热、蓄热和充放电速率特性进行了实验研究。在不同温度下，实验测量了吸附剂在所开发的复合材料和母离子液体上的吸附等温线和动力学。使用克劳修斯-克拉皮隆法测定了所有研究对的等效吸附热，结果表明随着吸附量的增加，等效吸附热呈上升趋势。研究结果表明，当使用水作为工作吸附剂时，比热存储容量达到 187.5 kJ/kg。与纯离子液体相比，相应的热充放电率明显较高，为 69 %-78 %。与作为基准吸附剂的硅胶相比，离子液体-石墨烯复合材料的蓄热和传热能力高出三个数量级。开发的复合材料的热扩散率明显高于基准硅胶。这些创新型吸附复合材料在提高热能存储效率方面显示出巨大潜力，使其适合应用于可再生能源系统、工业流程、废热回收和气候控制解决方案。然而，与硅胶基线吸附剂相比，所开发的复合材料在使用乙醇作为工作流体以利用零度以下的环境空气作为热源时性能较差，这是因为乙醇的分子相对较大。

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Material-level experimental study on utilising ionic liquid/graphene composites for sorption heat storage

Sorption heat storage technology has recently sparked an increasing interest because of its advanced heat storage capabilities. However, material-level heat and mass transfer challenges persist. This work contributes to the field by the development of new sorption composite materials that are comprised ionic liquids (1-ethyl-3-methylimidazolium methanesulfonate and 1-ethyl-3-methylimidazolium chloride) impregnated in 1–5 2D-layered graphene host matrix. Their sorption, heat transfer, heat storage, and charging/discharging rate properties were experimentally investigated using both water and ethanol as adsorbates. The adsorption isotherms and kinetics for both the adsorbates onto the developed composites and the parent ionic liquids were experimentally measured at different temperatures. The isosteric heat of adsorption for all the studied pairs was determined using the Clausius-Clapeyron method, showing an increasing trend with an increasing uptake. They showed that the specific heat storage capacity reached 187.5 kJ/kg when water was used as the working sorption agent. The corresponding heat charging/discharging rates are significantly higher, 69 %-78 %, than pure ionic liquids. Compared to silica gel as a baseline sorbent, ionic liquid-graphene composites’ heat storage and transfer capacities are higher by three orders of magnitude. The thermal diffusivities of the developed composites were significantly higher than the baseline silica gel. These innovative sorption composites show great potential for improving thermal energy storage efficiency, making them suitable for applications in renewable energy systems, industrial processes, waste heat recovery, and climate control solutions. However, the developed composites achieved inferior performance compared to the silica gel baseline sorbent when using ethanol as a working fluid to utilise sub-zero ambient air as a heat source because of the relatively larger molecular size of ethanol.

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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

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