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Thermal energy storage of molten salt –based nanofluid containing nano-encapsulated metal alloy phase change materials

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  • Navarrete, Nuria
  • Mondragón, Rosa
  • Wen, Dongsheng
  • Navarro, Maria Elena
  • Ding, Yulong
  • Juliá, J. Enrique

Abstract

The availability of Thermal Energy Storage systems in Concentrated Solar Power plants makes them suitable to handle the gap between energy supply and power demand. Increasing the total thermal energy storage capacity of the Thermal Energy Storage materials used is of interest to improve their efficiency. In this work the thermal energy storage of the so called solar salt (60% NaNO3 - 40% KNO3) was improved by adding a phase change material composed of Al-Cu alloy nanoencapsulated with an aluminium oxide layer naturally formed when exposed to oxygen. The resistance of the oxide shell to thermal cycling up to 570 °C and its compatibility with the molten salt were proved. The specific heat and the total thermal energy storage were evaluated at different solid mass loads. Although the specific heat and thus the sensible heat storage decreases with solid content, the contribution of the phase change enthalpy and the latent heat storage can increase the total thermal energy storage up to a 17.8% at constant volume basis comparison. Besides, the thermal conductivity of the nanofluid was increased when adding the nanoparticles improving its heat transfer performance under some particular conditions.

Suggested Citation

  • Navarrete, Nuria & Mondragón, Rosa & Wen, Dongsheng & Navarro, Maria Elena & Ding, Yulong & Juliá, J. Enrique, 2019. "Thermal energy storage of molten salt –based nanofluid containing nano-encapsulated metal alloy phase change materials," Energy, Elsevier, vol. 167(C), pages 912-920.
    • Handle: RePEc:eee:energy:v:167:y:2019:i:c:p:912-920
    DOI: 10.1016/j.energy.2018.11.037
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    2. Pan, Gechuanqi & Wei, Xiaolan & Yu, Chao & Lu, Yutong & Li, Jiang & Ding, Jing & Wang, Weilong & Yan, Jinyue, 2020. "Thermal performance of a binary carbonate molten eutectic salt for high-temperature energy storage applications," Applied Energy, Elsevier, vol. 262(C).
    3. Xiao, Xin & Jia, Hongwei & Wen, Dongsheng & Zhao, Xudong, 2020. "Thermal performance analysis of a solar energy storage unit encapsulated with HITEC salt/copper foam/nanoparticles composite," Energy, Elsevier, vol. 192(C).
    4. Xiong, Yaxuan & Wang, Zhenyu & Wu, Yuting & Xu, Peng & Ding, Yulong & Chang, Chun & Ma, Chongfang, 2019. "Performance enhancement of bromide salt by nano-particle dispersion for high-temperature heat pipes in concentrated solar power plants," Applied Energy, Elsevier, vol. 237(C), pages 171-179.

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