储能科学与技术 ›› 2023, Vol. 12 ›› Issue (12): 3643-3654.doi: 10.19799/j.cnki.2095-4239.2023.0609

• 复合储热专辑 • 上一篇    下一篇

三水乙酸钠复合相变材料的制备与热性能研究

尹国超1(), 刘军祥1,2,3(), 于庆波1,2,3, 王浩磊1   

  1. 1.东北大学
    2.东北大学低碳钢铁前沿技术研究院
    3.辽宁省低碳钢铁前沿技术工程研究中心，辽宁 沈阳 110819
  • 收稿日期:2023-09-06 修回日期:2023-10-04 出版日期:2023-12-05 发布日期:2023-12-09
  • 通讯作者: 刘军祥 E-mail:yingcll@163.com;liujx@mail.neu.edu.cn
  • 作者简介:尹国超（1999—），男，硕士研究生，研究方向为热能储存，E-mail：yingcll@163.com；
  • 基金资助:
    中央高校基本科研业务专项资金(N2225042)

Preparation and properties of composite phase-change materials with sodium acetate trihydrate

Guochao YIN1(), Junxiang LIU1,2,3(), Qingbo YU1,2,3, Haolei WANG1   

  1. 1.Northeastern University
    2.Institute of Low-Carbon Steel and Iron Frontier Technology, Northeastern University
    3.Liaoning Province Low-Carbon Steel and Iron Frontier Technology Engineering Research Center, Shenyang 110819, Liaoning, China
  • Received:2023-09-06 Revised:2023-10-04 Online:2023-12-05 Published:2023-12-09
  • Contact: Junxiang LIU E-mail:yingcll@163.com;liujx@mail.neu.edu.cn

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摘要：

本工作以羧甲基纤维素钠作为增稠剂，并分别以十二水磷酸氢二钠、无水磷酸氢二钠、纳米Al2O3及经十二烷基硫酸钠改性的纳米Al2O3作为成核剂，以石墨作为导热增强剂，采用熔融共混法制备出一系列复合相变材料(composite phase change materials，CPCMs)。通过红外光谱仪、扫描电镜、差示扫描量热仪和温度采集系统对CPCMs的成分、形貌和热性能等进行综合分析，结果显示，在三水乙酸钠基体中添加2%羧甲基纤维素钠/3%十二水磷酸氢二钠或2%羧甲基纤维素钠/1%改性纳米Al2O3能有效解决SAT相分离和过冷度大的问题，DSC分析结果显示CPCMs的相变焓维持在247.98 J/g和244.64 J/g的水平。在三水乙酸钠基体中加入2%羧甲基纤维素钠/3%十二水磷酸氢二钠/1%石墨或2%羧甲基纤维素钠/3%十二水磷酸氢二钠/1%改性纳米Al2O3/1%石墨能在不提高过冷度的同时增强CPCMs的导热能力，对CPCMs进行了快速循环蓄放热实验，通过T-history 法计算相对潜热的变化，结果发现，随着循环次数的增加，前者热衰减率不断增加，在循环次数达到40次后趋于稳定，热衰减约23%，而后者在经过50次循环后过冷度有增加的趋势。本研究有助于推动相变材料在储热领域的应用，并为高焓值和高稳定性三水乙酸钠复合相变材料的研发提供实验依据。

关键词: 三水乙酸钠, 增稠剂, 成核剂, 石墨, 循环蓄放热实验

Abstract:

In this study, a series of composite phase-change materials (CPCMs) were prepared by the melt-blending method using sodium carboxymethyl cellulose as a thickener; disodium hydrogen phosphate dodecahydrate, disodium hydrogen phosphate anhydrous, nano-Al2O3, and nano-Al2O3 modified by sodium dodecyl sulfate as nucleating agents; and graphite as a thermally conductive enhancer. A comprehensive analysis of the composition, morphology, and thermal properties of CPCMs was performed using an infrared spectrometer, scanning electron microscope, differential scanning calorimeter, and temperature acquisition system. The results show that the addition of 2% sodium carboxymethylcellulose/3% disodium hydrogen phosphate dodecahydrate or 2% sodium carboxymethylcellulose/1% modified nano-Al2O3 to sodium acetate trihydrate matrix can effectively solve the problems of SAT phase separation and large supercooling. The DSC analysis results indicate that the enthalpies of phase transition for the CPCMs are maintained at 247.98 J/g and 244.64 J/g. Adding 2% sodium carboxymethyl cellulose/3% disodium hydrogen phosphate dodecahydrate/1% graphite or 2% sodium carboxymethyl cellulose/3% disodium hydrogen phosphate dodecahydrate/1% modified nano-Al2O3/1% graphite to the sodium acetate trihydrate matrix enhances the thermal conductivity of the CPCMs without increasing supercooling during rapid-cycling storage. Exothermic experiments were carried out on the CPCMs, and the changes in relative latent heat were calculated using the T-history method. The rate of heat decay was found to increase with the increase in the number of cycles. The first formulation tended to stabilize after reaching 40 cycles, with a heat decay of approximately 23%, whereas the second formulation tended to have an increase in the degree of subcooling after 50 cycles. These results help promote the application of phase-change materials in the field of thermal storage and provide an experimental basis for the development of composite phase-change materials by ensuring the high enthalpy and high stability of sodium acetate trihydrate.

Key words: sodium acetate trihydrate, thickening agent, nucleating agent, graphite, cyclic storage and exothermic experiment

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