石蜡基复合相变储热材料的导热性能

储能科学与技术 ›› 2012, Vol. 1 ›› Issue (2): 131-138.

石蜡基复合相变储热材料的导热性能

马炳倩^{1, 2}, 李建强³, 彭志坚², 丁玉龙^{1, 3}

1 英国利兹大学过程环境材料学院,利兹 LS2 9JT;
2 中国地质大学(北京)工程技术学院,北京 100083;
3 中国科学院过程工程研究所,北京 100190

收稿日期:2012-10-02 出版日期:2012-11-19 发布日期:2012-11-19
通讯作者: 丁玉龙教授,研究方向为储能系统,储能过程中多相流动与传热强化,无机中高温复合储能材料;基于超临界过程的空气储能技术等,E-mail:Y.Ding@leeds.ac.uk.
作者简介:马炳倩(1984--),女,博士研究生,研究方向为相变储热材料石蜡的传热强化,E-mail:prebma@leeds.ac.uk
基金资助:
国家科技支撑计划课题(2012BAA03B03),中国科学院重点部署项目(KGZD-EW-302-1),英国EPSRC项目(EP/K002252/1)

Paraffin based composite phase change materials for thermal energy storage: Thermal conductivity enhancement

MA Bingqian^{1, 2}, LI Jianqiang³, PENG Zhijian², DING Yulong^{1, 3}

1 School of Process,Environmental and Materials Engineering,University of Leeds,Leeds LS2 9JT,UK;
2 School of Engineering and Technology,China University of Geosciences,Beijing 100083,China;
3 Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

Received:2012-10-02 Online:2012-11-19 Published:2012-11-19

摘要/Abstract

摘要： 为提高石蜡作为固-液相变储热材料的导热性能,在石蜡(PW)中掺加高导热系数的碳纳米管(CNTs),制备了碳纳米管-石蜡复合相变材料(PW-CNTs).为进一步增强PW-CNTs的传热性能,通过内置金属网结构,利用金属网的高导热性,加快PW-CNTs作为相变材料的充放热速率.测试了PW-CNTs的熔点和相变潜热,导热系数以及置入金属网前后的充放热时间.结果显示,PW-CNTs的导热系数较石蜡得到显著提高,其中掺加10%(质量分数)CNTs的复合材料的固态,液态导热系数平均分别提高31.4%,40.2%.置入金属网结构后,PW-CNTs的充放热时间至少分别缩短了40.3%和30.2%.此外,碳纳米管在石蜡中易发生团聚沉积,针对这一特点,对PW-CNTs进行了多次热循环,研究了热循环对PW-CNTs导热系数的影响.

关键词: 相变材料, 石蜡, 碳纳米管, 金属网, 导热系数, 充放热时间

Abstract: Paraffin wax (PW) has been widely used as a phase change material for thermal energy storage due to relatively high thermal energy storage density and other desirable properties. However, it has a low thermal conductivity (TC), leading to a long charging and discharging time. To address the issue, carbon nanotubes (CNTs) were mixed with PW to form PW-CNTs composites. As CNTs are highly thermally conductive, the use of such a material is expected to give a good level of thermal conductivity enhancement. To further enhance the heat transfer process, metal meshes were placed in the interior of the PW-CNTs composites. Experimental results show that the addition of 10% CNTs by mass leads to a thermal conductivity enhancement of 31.4% and 40.2% respectively in the solid and liquid states. The results also show that the use of metal meshes shortens the charging and discharging durations by at least 40.3% and 30.2%, respectively. Heating and cooling cycling tests have also been carried on the PW-CNTs composites and the results show a large decrease in the thermal conductivity after a few cycles due to severe aggregation of CNTs in PW-CNTs composites.

Key words: phase change materials, paraffin wax, carbon nanotubes, metal meshes, thermal conductivity enhancement, charging and discharging time

中图分类号:

TK02

马炳倩, 李建强, 彭志坚, 丁玉龙. 石蜡基复合相变储热材料的导热性能[J]. 储能科学与技术, 2012, 1(2): 131-138.

MA Bingqian, LI Jianqiang, PENG Zhijian, DING Yulong. Paraffin based composite phase change materials for thermal energy storage: Thermal conductivity enhancement[J]. Energy Storage Science and Technology, 2012, 1(2): 131-138.

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