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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 4: 1564 - 1576

DOI: https://doi.org/10.1007/s11630-024-1990-4

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Thermal Property Enhancement of a Novel Shape-Stabilized Sodium Acetate Trihydrate-Acetamide/Expanded Graphite-Based Composite Phase Change Material

  • AN Zhoujian ,
  • HOU Wenjie ,
  • DU Xiaoze ,
  • HUANG Zhongzheng ,
  • MOMBEKI PEA Hamir Johan ,
  • ZHANG Dong ,
  • LIU Xiaomin
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  • 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    2. Key Laboratory of Multi-supply System with Solar Energy and Biomass of Gansu Province, Lanzhou 730050, China
    3. Gansu Natural Energy Research Institute, Lanzhou 730046, China

网络出版日期: 2024-07-15

基金资助

This work was financially supported by the National Natural Science Foundation of China (52206087; 52130607), the Key R&D Program of Gansu Province (23YFGA0066; 23YFGA0035), the Industrial Support Plan Project of Gansu Provincial Education Department (2022CYZC-21; 2021CYZC-27), the Doctoral Research Funds of Lanzhou University of Technology (061907), the Incubation Program of Excellent Doctoral Dissertation-Lanzhou University of Technology, the Red Willow Excellent Youth Project of Lanzhou University of Technology, and the Open Fund of Key Laboratory of Multi-supply System with Solar Energy and Biomass of Gansu Province.

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Thermal Property Enhancement of a Novel Shape-Stabilized Sodium Acetate Trihydrate-Acetamide/Expanded Graphite-Based Composite Phase Change Material

  • AN Zhoujian ,
  • HOU Wenjie ,
  • DU Xiaoze ,
  • HUANG Zhongzheng ,
  • MOMBEKI PEA Hamir Johan ,
  • ZHANG Dong ,
  • LIU Xiaomin
Expand
  • 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    2. Key Laboratory of Multi-supply System with Solar Energy and Biomass of Gansu Province, Lanzhou 730050, China
    3. Gansu Natural Energy Research Institute, Lanzhou 730046, China

Online published: 2024-07-15

Supported by

This work was financially supported by the National Natural Science Foundation of China (52206087; 52130607), the Key R&D Program of Gansu Province (23YFGA0066; 23YFGA0035), the Industrial Support Plan Project of Gansu Provincial Education Department (2022CYZC-21; 2021CYZC-27), the Doctoral Research Funds of Lanzhou University of Technology (061907), the Incubation Program of Excellent Doctoral Dissertation-Lanzhou University of Technology, the Red Willow Excellent Youth Project of Lanzhou University of Technology, and the Open Fund of Key Laboratory of Multi-supply System with Solar Energy and Biomass of Gansu Province.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

相变材料是一种高效的储热材料，在建筑节能、余热回收、电池热管理等多个领域有着广阔的应用前景。特别是无机水合盐相变材料，由于价格低廉、不易燃等优点，越来越受到研究人员的青睐。然而，无机水合盐相变材料在应用过程中仍然受到其相变温度、液相泄漏、过冷度大和相分离严重等方面的限制。本研究选择三水合醋酸钠作为基础无机相变材料，并通过使用各种功能添加剂改性，制备出具有良好热性能的新型形状稳定的复合相变材料。首先，使用了乙酰胺来调节三水合醋酸钠的熔点，制备出三水醋酸钠-乙酰胺二元混合物。然后，将二元混合物与膨胀石墨复合，合成了一种新型形状稳定的复合相变材料。系统地研究了制备得到的复合相变材料的热物理性质。并对得到的形状稳定复合相变材料的微观形貌和化学结构进行了表征和分析。结果表明，乙酰胺可以有效降低三水合醋酸钠的熔点。使用18%乙酰胺和12%膨胀石墨改性获得的形状稳定复合相变材料，具有良好的定形效果和热物理性能：其过冷度仅为1.75°C，熔化温度为40.77°C，潜热为151.64 kJ/kg，热导率高达1.411 W/(mŸK)。此外，所制备的形状稳定复合相变材料在经历50次加速熔化-凝固循环后，表现出良好的热可靠性。

关键词： sodium acetate trihydrate; melting point modification agent; expanded graphite; shape stability; thermal conductivity enhancement

本文引用格式

AN Zhoujian , HOU Wenjie , DU Xiaoze , HUANG Zhongzheng , MOMBEKI PEA Hamir Johan , ZHANG Dong , LIU Xiaomin . Thermal Property Enhancement of a Novel Shape-Stabilized Sodium Acetate Trihydrate-Acetamide/Expanded Graphite-Based Composite Phase Change Material[J]. 热科学学报, 2024 , 33(4) : 1564 -1576 . DOI: 10.1007/s11630-024-1990-4

Abstract

Phase change materials (PCMs) are a kind of highly efficient thermal storage materials which have a bright application prospect in many fields such as energy conservation in buildings, waste heat recovery, battery thermal management and so on. Especially inorganic hydrated salt PCMs have received increasing attention from researchers due to their advantages of being inexpensive and non-flammable. However, inorganic hydrated salt PCMs are still limited by the aspects of inappropriate phase change temperature, liquid phase leakage, large supercooling and severe phase separation in the application process. In this work, sodium acetate trihydrate was selected as the basic inorganic PCM, and a novel shape-stabilized composite phase change material (CPCM) with good thermal properties was prepared by adding various functional additives. At first, the sodium acetate trihydrate-acetamide binary mixture was prepared and the melting point was adjusted using acetamide. Then the binary mixture was incorporated into expanded graphite to synthesize a novel shape-stabilized CPCM. The thermophysical properties of the resultant shape-stabilized CPCM were systematically investigated. The microscopic morphology and chemical structure of the obtained shape-stabilized CPCM were characterized and analyzed. The experiment results pointed out that acetamide could effectively lower the melting point of sodium acetate trihydrate. The obtained shape-stabilized CPCM modified with additional 18% (mass fraction) acetamide and 12% (mass fraction) expanded graphite exhibited good shape stability and thermophysical characteristics: a low supercooling degree of 1.75°C and an appropriate melting temperature of 40.77°C were obtained; the latent heat of 151.64 kJ/kg and thermal conductivity of 1.411 W/(m·K) were also satisfactory. Moreover, after 50 accelerated melting-freezing cycles, the obtained shape-stabilized CPCM represented good thermal reliability.

Key words： sodium acetate trihydrate; melting point modification agent; expanded graphite; shape stability; thermal conductivity enhancement

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