Preparation and Thermal Properties of a Novel Modified Ammonium Alum/Expanded Graphite Composite Phase Change Material

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  • 1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2. Key Laboratory of Energy Saving and Emission Reduction, University of Science and Technology Beijing, Beijing 100083, China

网络出版日期: 2023-11-26

基金资助

This work was supported by the National key research and development plan of China (No. 2022YFC3800401) and the Fundamental Research Funds for the Central Universities (FRF-BD-20-09A).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Preparation and Thermal Properties of a Novel Modified Ammonium Alum/Expanded Graphite Composite Phase Change Material

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  • 1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2. Key Laboratory of Energy Saving and Emission Reduction, University of Science and Technology Beijing, Beijing 100083, China

Online published: 2023-11-26

Supported by

This work was supported by the National key research and development plan of China (No. 2022YFC3800401) and the Fundamental Research Funds for the Central Universities (FRF-BD-20-09A).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

利用相变材料进行热能储存是提高能源利用率的有效途径。十二水硫酸铝铵(Ammonium alum,A-alum)由于具有过冷度大、热导率低的缺点,使它在潜热储能系统中的应用受到严重限制。为克服A-alum的缺点,本文制备了含有不同成核剂的改性A-alum(Modified A-alum,M-PCM),并将其进一步吸附在膨胀石墨(Expanded Graphite,EG)中获得复合相变材料(Composite phase change material,CPCM)。采用差式扫描量热分析(Differential scanning calorimetry,DSC)、热常数分析、扫描电镜(Scanning electron microscopy,SEM)、X射线衍射分析(X-ray diffraction,XRD)和傅里叶红外光谱分析(Fourier transform infrared spectroscopy,FTIR)等手段对CPCM的热物性、热循环稳定性、微观结构和化学兼容性进行了测试表征。建立并解释了CPCM的冷回温现象。结果表明,CPCM的相变潜热和相变点分别为187.22J/g和91.54℃。与纯A-alum相比,CPCM的过冷度下降了9.61℃,热导率增加了27倍。蓄放热实验结果表明,2wt%的二水氯化钙(Calcium chloride dihydrate,CCD)是A-alum的最佳成核剂。热重分析和30次热循环实验结果表明,CPCM在工作温度下表现出良好的热稳定性和可靠性。本文所制备的改性A-alum/EG复合相变材料在潜热储能系统中具有良好的应用前景。

本文引用格式

YIN Shaowu, HAN Jiawei, ZHANG Chao, KANG Peng, TONG Lige, WANG Li . Preparation and Thermal Properties of a Novel Modified Ammonium Alum/Expanded Graphite Composite Phase Change Material[J]. 热科学学报, 2023 , 32(6) : 2093 -2103 . DOI: 10.1007/s11630-023-1825-8

Abstract

Thermal energy storage (TES) using phase change materials (PCMs) is a powerful solution to the improvement of energy efficiency. The application of Ammonium alum (A-alum, NH4Al(SO4)2·12H2O) in the latent thermal energy storage (LTES) systems is hampered due to its high supercooling and low thermal conductivity. In this work, modified A-alum (M-PCM) containing different nucleating agents was prepared and further adsorbed in expanded graphite (EG) to obtain composite phase change material (CPCM) to overcome the disadvantages of A-alum. Thermal properties, thermal cycle stability, microstructure and chemical compatibility of CPCM were characterized by differential scanning calorimetry, thermal constant analysis, scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The cold rewarming phenomenon of CPCM was established and explained. Results showed that the latent heat and melting point of CPCM were 187.22 J/g and 91.54°C, respectively. The supercooling of CPCM decreased by 9.61°C, and thermal conductivity increased by 27 times compared with pure A-alum. Heat storage and release tests indicated that 2 wt% calcium chloride dihydrate (CCD, CaCl2·2H2O) was the optimum nucleating agent for A-alum. The result of TG and 30 thermal cycles revealed that CPCM exhibited favorable thermal stability and reliability during the operating temperature. The prepared modified A-alum/EG CPCM has a promising application prospect for LTES.

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