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Thermal performance of a binary carbonate molten eutectic salt for high-temperature energy storage applications

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  • Pan, Gechuanqi
  • Wei, Xiaolan
  • Yu, Chao
  • Lu, Yutong
  • Li, Jiang
  • Ding, Jing
  • Wang, Weilong
  • Yan, Jinyue

Abstract

Molten carbonate eutectic salts are promising thermal storage and heat transfer fluid materials in solar thermal power plant with the feature of large specific heat capacity, wide operating temperature range and little corrosive. The high-temperature properties of molten carbonates should be determined accurately over the entire operating temperature for energy system design. In this paper, molecular dynamic simulation is used to study temperature and component dependence of microstructures and thermophysical properties of the binary carbonate molten salt. Negative linear temperature dependence of densities and thermal conductivities of binary mixtures of different components is confirmed with respect to the distances of ion clusters. Besides, positive linear temperature dependence of self-diffusion coefficient is also obtained. When temperature is constant, densities and thermal conductivities of binary mixtures are linearly related with components. Self-diffusion coefficients of CO32− firstly increase and then decrease with increasing mole fraction of Na2CO3. The temperature-thermophysical properties-composition correlation formulas are obtained, and the database of thermophysical properties of molten carbonate salts over the entire operating temperature is complemented, which will provide the essential data for heat transfer and storage system design, operation, and optimization in CSP.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:appene:v:262:y:2020:i:c:s0306261919321051
    DOI: 10.1016/j.apenergy.2019.114418
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    References listed on IDEAS

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    1. Ding, Jing & Pan, Gechuanqi & Du, Lichan & Lu, Jianfeng & Wang, Weilong & Wei, Xiaolan & Li, Jiang, 2018. "Molecular dynamics simulations of the local structures and transport properties of Na2CO3 and K2CO3," Applied Energy, Elsevier, vol. 227(C), pages 555-563.
    2. 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.
    3. Hao, Wenbin & He, Xiaojin & Mi, Yongli, 2014. "Achieving high performance in intermediate temperature direct carbon fuel cells with renewable carbon as a fuel source," Applied Energy, Elsevier, vol. 135(C), pages 174-181.
    4. Ding, Jing & Du, Lichan & Pan, Gechuanqi & Lu, Jianfeng & Wei, Xiaolan & Li, Jiang & Wang, Weilong & Yan, Jinyue, 2018. "Molecular dynamics simulations of the local structures and thermodynamic properties on molten alkali carbonate K2CO3," Applied Energy, Elsevier, vol. 220(C), pages 536-544.
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    1. Ruan, Zhao-Hui & Gao, Peng & Yuan, Yuan & Tan, He-Ping, 2022. "Theoretical estimation of temperature-dependent radiation properties of molten solar salt using molecular dynamics and first principles," Energy, Elsevier, vol. 246(C).
    2. José Pereira & Ana Moita & António Moreira, 2023. "An Overview of the Molten Salt Nanofluids as Thermal Energy Storage Media," Energies, MDPI, vol. 16(4), pages 1-51, February.
    3. Tian, Heqing & Kou, Zhaoyang & Pang, Xinchang & Yu, Yinsheng, 2023. "Molecular dynamics simulation on thermophysical properties and local structure of ternary chloride salt for thermal energy storage and transfer system," Energy, Elsevier, vol. 284(C).

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