Effects of various carbon nanofillers on the thermal conductivity and energy storage properties of paraffin-based nanocomposite phase change materials
Effects of various carbon nanofillers on the thermal conductivity and energy storage properties of paraffin-based nanocomposite phase change materials
复制标题
不同碳纳米填料对石蜡基纳米复合相变材料导热性能和储能性能的影响
DOI：
10.1016/j.apenergy.2013.04.043
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发表时间：
2013-10-01
期刊：
影响因子：
11.2
通讯作者：
Cen, Ke-Fa
中科院分区：
文献类型：
--
作者：
Fan, Li-Wu;Fang, Xin;Cen, Ke-Fa
实验研究了添加不同碳纳米填料对石蜡基纳米复合相变热能储存材料（PCM）导热率和储能性能的影响。其中包括短和长的多壁碳纳米管、碳纳米纤维和石墨烯纳米片（GNP）。对于每种类型的纳米填料，制备质量浓度为 1-5 wt.%、增量为 1 wt.% 的纳米复合材料 PCM 样品。在高温下使用瞬态热线法测量固相样品的导热率。使用差示扫描量热计测量能量存储特性，包括熔化/凝固温度和焓。结果表明，纳米填料的存在略微降低了相变焓，并且对相变温度的影响可以忽略不计。研究发现，纳米复合材料 PCM 的热导率随着负载量的增加而增加，而相对增强很大程度上取决于纳米填料的尺寸和形状。在所检查的四种类型的碳纳米填料中，观察到 GNP 在 5 wt.% 的负载量下引起最大的相对增强，高达 164%，因为它们的二维平面结构导致填料/基体热界面阻力降低，而基于 GNP 的纳米复合材料 PCM 的储能容量则略有下降。 (C) 2013 Elsevier Ltd. 保留所有权利。
The effects of adding various carbon nanfillers on the thermal conductivity and energy storage properties of paraffin-based nanocomposite phase change materials (PCMs) for thermal energy storage were investigated experimentally. These included short and long multi-walled carbon nanotubes, carbon nanofibers, and graphene nanoplatelets (GNPs). For each type of the nanofillers, nanocomposite PCM samples with mass concentrations of 1-5 wt.% at an increment of 1 wt.% were prepared. The thermal conductivity of the samples in solid phase was measured using the transient hot-wire method at elevated temperatures. The energy storage properties, including melting/solidification temperatures and enthalpies, were measured using a differential scanning calorimeter. It was shown that the presence of the nanofillers slightly decreases the phase change enthalpies and has negligible influence on the phase change temperatures. The thermal conductivity of the nanocomposite PCMs was found to increase with raising the loading, while the relative enhancement strongly depends on the size and shape of the nanofillers. Of the four types of carbon nanofillers examined, GNPs were observed to cause greatest relative enhancement up to 164% at the loading of 5 wt.%, due to their two-dimensional planar structure that leads to reduced filler/matrix thermal interface resistance, in contrast to the moderately decreased energy storage capacity of GNP-based nanocomposite PCMs. (C) 2013 Elsevier Ltd. All rights reserved.