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Specific heat capacity improvement of molten salt for solar energy applications using charged single-walled carbon nanotubes

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  • Yuan, Fan
  • Li, Ming-Jia
  • Qiu, Yu
  • Ma, Zhao
  • Li, Meng-Jie

Abstract

This work focuses on the effects of charged single-walled carbon nanotubes (SWCNT) on the heat capacity of composite carbonate salt (Li2CO3-K2CO3) using the Electric Double-Layer modeling (EDL) and the Molecular Dynamics (MD) simulation. The nanoparticle-enhanced molten salt ensemble is modeled considering the compressed ion layer surrounding the SWCNT, and the specific heat capacity (cp) enhancement of the nanoparticle-enhanced molten salt is analyzed. The results present the following issues. First, compressed ion layer is formed around the SWCNT surface. The density distributions of Li+, K+ and CO32– are strongly related to the SWCNT charge. The density distributions of the ions present characteristics of oscillatory, and the densities of the ions can be increased by rise of SWCNT charge. Second, the charge density distribution is analyzed. The local enrichment of positive and negative charges is found to occur inside the compressed ion layer. It is found that increasing the SWCNT charge can promote the local enrichment of positive and negative charges, which contributes to the increase of the internal energy of the nanoparticle-enhanced molten salt ensemble and results in cp enhancement. Finally, cp is found to be increased with increasing SWCNT charge. The cp enhancement of 19.2% is achieved when the SWCNT carries surface charge of −280e. The obtained results can provide guidance on the application of charged nanoparticles to enhance the specific capacity of molten salt.

Suggested Citation

  • Yuan, Fan & Li, Ming-Jia & Qiu, Yu & Ma, Zhao & Li, Meng-Jie, 2019. "Specific heat capacity improvement of molten salt for solar energy applications using charged single-walled carbon nanotubes," Applied Energy, Elsevier, vol. 250(C), pages 1481-1490.
    • Handle: RePEc:eee:appene:v:250:y:2019:i:c:p:1481-1490
    DOI: 10.1016/j.apenergy.2019.04.167
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    Cited by:

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    2. Yu, Yinsheng & Zhao, Chenyang & Tao, Yubing & Chen, Xi & He, Ya-Ling, 2021. "Superior thermal energy storage performance of NaCl-SWCNT composite phase change materials: A molecular dynamics approach," Applied Energy, Elsevier, vol. 290(C).
    3. Arias, I. & Cardemil, J. & Zarza, E. & Valenzuela, L. & Escobar, R., 2022. "Latest developments, assessments and research trends for next generation of concentrated solar power plants using liquid heat transfer fluids," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
    4. Zhao, C.Y. & Tao, Y.B. & Yu, Y.S., 2022. "Thermal conductivity enhancement of phase change material with charged nanoparticle: A molecular dynamics simulation," Energy, Elsevier, vol. 242(C).
    5. Xia Chen & Mingxuan Zhang & Yuting Wu & Chongfang Ma, 2023. "Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research," Energies, MDPI, vol. 16(5), pages 1-28, February.
    6. Zhao Li & Liu Cui & Baorang Li & Xiaoze Du, 2021. "Effects of SiO 2 Nanoparticle Dispersion on The Heat Storage Property of the Solar Salt for Solar Power Applications," Energies, MDPI, vol. 14(3), pages 1-14, January.

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