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Thermal Performance Analysis of Composite Phase Change Material of Myristic Acid-Expanded Graphite in Spherical Thermal Energy Storage Unit

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  • Ji Li

    (Engineering Research Center of Renewable Energy Power Generation and Grid-Connected Control, Ministry of Education, Xinjiang University, Urumqi 830017, China
    Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830011, China)

  • Weiqing Wang

    (Engineering Research Center of Renewable Energy Power Generation and Grid-Connected Control, Ministry of Education, Xinjiang University, Urumqi 830017, China)

  • Yimin Deng

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Long Gao

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Junchao Bai

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Lei Xu

    (Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830011, China)

  • Jun Chen

    (Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd., Urumqi 830011, China)

  • Zhi Yuan

    (Engineering Research Center of Renewable Energy Power Generation and Grid-Connected Control, Ministry of Education, Xinjiang University, Urumqi 830017, China)

Abstract

In order to improve energy storage efficiency and promote the early achievement of global carbon neutrality goals, this paper proposes a spherical thermal storage unit filled with a composite phase change material (CPCM) comprising myristic acid (MA) and expanded graphite (EG). The effects of EG content and Stefan number (Ste) on the melting performance were investigated through a combination of experiments and numerical simulations. The results show that an increase in EG content (especially for ≥4 wt.% EG) leads to a temperature profile that assumes a concentric ring shape, while the melting rate increases with an increase in both the EG mass fraction and the Ste number. Compared to pure MA, the time required to complete melting was reduced by 82.2%, 85.6%, and 88.0% at EG contents of 4 wt.%, 5 wt.%, and 6 wt.%, respectively. Notably, the Ste value has a greater effect on melting when the EG content is ≤3 wt.%. The optimal EG content in the spherical cell was determined to be 4 wt.%, and a dimensionless analysis established a general correlation between the liquid mass fraction and the Fo, Ste, and Gr numbers.

Suggested Citation

  • Ji Li & Weiqing Wang & Yimin Deng & Long Gao & Junchao Bai & Lei Xu & Jun Chen & Zhi Yuan, 2023. "Thermal Performance Analysis of Composite Phase Change Material of Myristic Acid-Expanded Graphite in Spherical Thermal Energy Storage Unit," Energies, MDPI, vol. 16(11), pages 1-24, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:11:p:4527-:d:1164136
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    References listed on IDEAS

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    1. Li, Chuan & Li, Qi & Cong, Lin & jiang, Feng & Zhao, Yanqi & Liu, Chuanping & Xiong, Yaxuan & Chang, Chun & Ding, Yulong, 2019. "MgO based composite phase change materials for thermal energy storage: The effects of MgO particle density and size on microstructural characteristics as well as thermophysical and mechanical properti," Applied Energy, Elsevier, vol. 250(C), pages 81-91.
    2. Zhang, Ji & Cao, Zhi & Huang, Sheng & Huang, Xiaohui & Liang, Kun & Yang, Yan & Zhang, Haoran & Tian, Mi & Akrami, Mohammad & Wen, Chuang, 2022. "Improving the melting performance of phase change materials using novel fins and nanoparticles in tubular energy storage systems," Applied Energy, Elsevier, vol. 322(C).
    3. Leng, Guanghui & Qiao, Geng & Jiang, Zhu & Xu, Guizhi & Qin, Yue & Chang, Chun & Ding, Yulong, 2018. "Micro encapsulated & form-stable phase change materials for high temperature thermal energy storage," Applied Energy, Elsevier, vol. 217(C), pages 212-220.
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