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Encapsulation of high-temperature inorganic phase change materials using graphite as heat transfer enhancer

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  • Zhong, Yajuan
  • Zhao, Bingchen
  • Lin, Jun
  • Zhang, Feng
  • Wang, Haoran
  • Zhu, Zhiyong
  • Dai, Zhimin

Abstract

A quasi-isostatic pressing technique for encapsulating spherical high-temperature inorganic phase change materials (PCMs) was presented in this work. To enhance the thermal conductivity of PCMs, graphite powder was dispersed into the PCM pellets. Meanwhile, cellulose particles, as sacrificial particles, were mixed with the PCM pellets to relieve the volumetric expansion of the PCMs during the phase change process. The effects of the latent heat, thermal conductivity, and thermal expansion behavior of the PCM/graphite capsule were investigated. The PCM capsules were able to work at temperatures up to 900 °C, including undergoing a solid-liquid phase change at 803 °C with a latent heat of 159.6 J g−1, and survived more than 300 thermal cycles as thermal energy storage devices. The thermal performance of the PCM capsules between 500 and 900 °C was numerically investigated using a modified one-dimensional (1-D) enthalpy-based model. The results indicated that the average heat transfer of the PCM capsules with graphite-dispersed core was significantly elevated during both the charging (by 92.5% for 99% charge) and discharging (by 168.4% for 99% discharge) processes, compared to the pure core PCMs.

Suggested Citation

  • Zhong, Yajuan & Zhao, Bingchen & Lin, Jun & Zhang, Feng & Wang, Haoran & Zhu, Zhiyong & Dai, Zhimin, 2019. "Encapsulation of high-temperature inorganic phase change materials using graphite as heat transfer enhancer," Renewable Energy, Elsevier, vol. 133(C), pages 240-247.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:240-247
    DOI: 10.1016/j.renene.2018.09.107
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    References listed on IDEAS

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    2. Mawire, Ashmore & Lefenya, Tlotlo M. & Ekwomadu, Chidiebere S. & Lentswe, Katlego A. & Shobo, Adedamola B., 2020. "Performance comparison of medium temperature domestic packed bed latent heat storage systems," Renewable Energy, Elsevier, vol. 146(C), pages 1897-1906.
    3. Chen, C.Q. & Diao, Y.H. & Zhao, Y.H. & Wang, Z.Y. & Liang, L. & Wang, T.Y. & An, Y., 2021. "Optimization of phase change thermal storage units/devices with multichannel flat tubes: A theoretical study," Renewable Energy, Elsevier, vol. 167(C), pages 700-717.
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    5. Facundo Bre & Antonio Caggiano & Eduardus A. B. Koenders, 2022. "Multiobjective Optimization of Cement-Based Panels Enhanced with Microencapsulated Phase Change Materials for Building Energy Applications," Energies, MDPI, vol. 15(14), pages 1-17, July.

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