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Thermal Performance Improvement of Composite Phase-Change Storage Material of Octanoic Acid–Tetradecanol by Modified Expanded Graphite

Author

Listed:
  • Jin Tang

    (Clean Energy Laboratory, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yongfei Li

    (Qingdao Area Administration Center of Major Projects, China (Shandong) Pilot Free Trade Zone, Qingdao 266555, China)

  • Yunxiu Ren

    (Clean Energy Laboratory, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
    College of Electrical Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Zewen An

    (Qingdao Xin’Ao Clean Energy Co., Ltd., Qingdao 266000, China)

  • Ziqi Zhang

    (Qingdao Xin’Ao Clean Energy Co., Ltd., Qingdao 266000, China)

  • Laishun Yang

    (Clean Energy Laboratory, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China)

  • Weiwei Cui

    (Clean Energy Laboratory, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China)

  • Cuiping Wang

    (Clean Energy Laboratory, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

Phase-change cold storage technology is recommended as a solution for energy conservation and carbon neutrality in air conditioning systems of buildings. This study focuses on the development of binary composite phase-change materials comprising octanoic acid–tetradecanol (OA-TD). To enhance its thermal conductivity, expanded graphite (EG) was employed as an additive carrier, and the surface modification of EG particles using hexadecyltrimethoxysilane (HDTMOS) was attempted to make up for the instability and further to improve the performance of OA-TD/EG CPCMs. The OA-TD/EG-HDTMOS CPCMs were synthesized by EG mixed with EG-HDTMOS at a 1:1 mass ratio. The thermal performance and stability of the OA-TD/EG-HDTMOS CPCMs were thoroughly evaluated by multi-cycle melting–solidification and thermal conductivity measurements. The results revealed that the OA-TD mixture, when at a mass ratio of 77:23, exhibited a phase-transition temperature of 11.4 °C and a latent heat ranging from 150 to 155 J/g. Then, the OA-TD/EG-HDTMOS composite material, at a 12:1 mass ratio of OA-TD to EG-HDTMOS, solidified and melted at temperatures of 9.2 °C and 11.2 °C, with a latent heat ranging from 138 to 143 J/g, and significantly improved the thermal conductivity to 0.7 W/(m·K), representing a remarkable 133% increase compared to that of OA-TD alone. Even after undergoing 100 melting–solidification cycles, the OA-TD/EG-HDTMOS maintained superior phase-change thermal performance and stability, making it suitable for cold storage and energy conservation in air conditioning.

Suggested Citation

  • Jin Tang & Yongfei Li & Yunxiu Ren & Zewen An & Ziqi Zhang & Laishun Yang & Weiwei Cui & Cuiping Wang, 2024. "Thermal Performance Improvement of Composite Phase-Change Storage Material of Octanoic Acid–Tetradecanol by Modified Expanded Graphite," Energies, MDPI, vol. 17(17), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4311-:d:1466189
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    References listed on IDEAS

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    1. Lin, Yaxue & Zhu, Chuqiao & Alva, Guruprasad & Fang, Guiyin, 2018. "Palmitic acid/polyvinyl butyral/expanded graphite composites as form-stable phase change materials for solar thermal energy storage," Applied Energy, Elsevier, vol. 228(C), pages 1801-1809.
    2. Fateh Mebarek-Oudina & Ines Chabani, 2023. "Review on Nano Enhanced PCMs: Insight on nePCM Application in Thermal Management/Storage Systems," Energies, MDPI, vol. 16(3), pages 1-21, January.
    3. Gowthami, D. & Sharma, R.K., 2023. "Influence of Hydrophilic and Hydrophobic modification of the porous matrix on the thermal performance of form stable phase change materials: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).
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