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用于个人冷却系统的石蜡/膨胀石墨/纳米金属颗粒增强相变材料的实验研究

Experimental Study of an Enhanced Phase Change Material of Paraffin/Expanded Graphite/Nano-Metal Particles for a Personal Cooling System.

作者信息

Ma Chuyuan, Zhang Ying, Chen Xianfeng, Song Xiande, Tang Kaixuan

机构信息

School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China.

Guangzhou Expressway co. LTD, Guangzhou Transportation Investment Group, Guangzhou 510288, China.

出版信息

Materials (Basel). 2020 Feb 22;13(4):980. doi: 10.3390/ma13040980.

DOI:10.3390/ma13040980
PMID:32098301
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7078843/
Abstract

A composite phase change material (PCM) was prepared by incorporating paraffin (PA) with expanded graphite (EG) and nano-metal particles to improve the thermal conductivity and reduce the leakage performance of PA once it melts and, consequently, develop a more efficient PCM for a personal phase change cooling system. A series of experiments was carried out by a scanning electron microscope, a differential scanning calorimeter, a hot-disk thermal analyzer, and leakage tests on the composite PCM with various mass fractions of EG and metals (i.e., Cu, Al, Ni, and Fe). Through comprehensive consideration of the thermal conductivity, leakage, and homogeneity, a composite PCM with the optimal proportion (PA-EG11%-Cu1.9%) was screened out. Its thermal conductivity was significantly improved nine times, while the phase change enthalpy showed a minimal decrease. In addition, the relationships of the composite PCM with its temperature and density were systematically investigated. The experimental results are important for determining the proper package density of PCM for application into a personal cooling system because its weight is crucial for the system design and benefits the performance comparison of various PCMs prepared under various conditions. Lastly, the heat storage efficiency of the PA-EG-Cu material was investigated using heat storage tests. Cooling performance clearly improved compared to the PCM without nano-particles added.

摘要

通过将石蜡（PA）与膨胀石墨（EG）和纳米金属颗粒相结合，制备了一种复合相变材料（PCM），以提高其热导率，并在PA熔化时降低其泄漏性能，从而开发出一种更高效的用于个人相变冷却系统的PCM。利用扫描电子显微镜、差示扫描量热仪、热盘热分析仪对含有不同质量分数EG和金属（即Cu、Al、Ni和Fe）的复合PCM进行了一系列实验，并进行了泄漏测试。通过对热导率、泄漏和均匀性的综合考虑，筛选出了最佳比例（PA-EG11%-Cu1.9%）的复合PCM。其热导率显著提高了9倍，而相变焓仅略有下降。此外，还系统地研究了复合PCM与其温度和密度之间 的关系。实验结果对于确定PCM应用于个人冷却系统时的合适封装密度非常重要，因为其重量对系统设计至关重要，并且有利于比较在不同条件下制备的各种PCM的性能。最后，通过蓄热测试研究了PA-EG-Cu材料的蓄热效率。与未添加纳米颗粒的PCM相比，冷却性能明显提高。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8840/7078843/11ec47143166/materials-13-00980-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8840/7078843/5a61f95d8ef2/materials-13-00980-g017.jpg
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