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Experimental investigation and thermodynamic modeling of an innovative molten salt for thermal energy storage (TES)

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  • Li, Xiang
  • Wu, Shuang
  • Wang, Yang
  • Xie, Leidong

Abstract

A novel computational thermodynamic approach based on thermodynamic principles was applied to design and develop innovative molten salt mixtures for thermal energy storage. In this work, the eutectic composition of the NaCl-NaF-Na2CO3 ternary system was predicted based on experimental data via computational thermodynamic approach. Substitutional solution model (SSM) was used to describe the Gibbs energies for all liquid phases. Thus, a set of self-consistent thermodynamic model parameters was obtained for three subsystems and the parameters were used to predict the eutectic composition of the NaF-NaCl-Na2CO3 ternary system. Results manifested that the predicted eutectic point of the ternary system were located at T = 849 K and XNaF = 21.66 mol%, XNaCl = 41.87 mol% and XNa2CO3 = 36.47 mol%. By means of Differential Scanning Calorimetry method, the predicted results were verified experimentally and the agreement between the measured and predicted values was satisfactory. Thermal-physical properties for eutectic salt mixtures, such as enthalpies of fusion, heat capacity, density and thermal stability, were also determined experimentally via thermal analysis methods in this work. Through computational thermodynamics approach, an innovative eutectic salt was designed and developed as thermal energy storage (TES) materials at high temperatures, especially it can be serve as candidate thermal energy storage materials for next generation concentrated solar power (CSP) plants.

Suggested Citation

  • Li, Xiang & Wu, Shuang & Wang, Yang & Xie, Leidong, 2018. "Experimental investigation and thermodynamic modeling of an innovative molten salt for thermal energy storage (TES)," Applied Energy, Elsevier, vol. 212(C), pages 516-526.
    • Handle: RePEc:eee:appene:v:212:y:2018:i:c:p:516-526
    DOI: 10.1016/j.apenergy.2017.12.069
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    3. Mostafavi Tehrani, S. Saeed & Shoraka, Yashar & Nithyanandam, Karthik & Taylor, Robert A., 2018. "Cyclic performance of cascaded and multi-layered solid-PCM shell-and-tube thermal energy storage systems: A case study of the 19.9 MWe Gemasolar CSP plant," Applied Energy, Elsevier, vol. 228(C), pages 240-253.
    4. Kondaiah, P. & Pitchumani, R., 2022. "Novel textured surfaces for superior corrosion mitigation in molten carbonate salts for concentrating solar power," Renewable and Sustainable Energy Reviews, Elsevier, vol. 170(C).
    5. Kondaiah, P. & Pitchumani, R., 2023. "Progress and opportunities in corrosion mitigation in heat transfer fluids for next-generation concentrating solar power," Renewable Energy, Elsevier, vol. 205(C), pages 956-991.
    6. Skrbek, Kryštof & Bartůněk, Vilém & Sedmidubský, David, 2022. "Molten salt-based nanocomposites for thermal energy storage: Materials, preparation techniques and properties," Renewable and Sustainable Energy Reviews, Elsevier, vol. 164(C).
    7. Zhang, Zhaoli & Alelyani, Sami M. & Zhang, Nan & Zeng, Chao & Yuan, Yanping & Phelan, Patrick E., 2018. "Thermodynamic analysis of a novel sodium hydroxide-water solution absorption refrigeration, heating and power system for low-temperature heat sources," Applied Energy, Elsevier, vol. 222(C), pages 1-12.
    8. Mostafavi Tehrani, S. Saeed & Shoraka, Yashar & Nithyanandam, Karthik & Taylor, Robert A., 2019. "Shell-and-tube or packed bed thermal energy storage systems integrated with a concentrated solar power: A techno-economic comparison of sensible and latent heat systems," Applied Energy, Elsevier, vol. 238(C), pages 887-910.
    9. Han, Dongmei & Guene Lougou, Bachirou & Xu, Yantao & Shuai, Yong & Huang, Xing, 2020. "Thermal properties characterization of chloride salts/nanoparticles composite phase change material for high-temperature thermal energy storage," Applied Energy, Elsevier, vol. 264(C).
    10. Li, Xiang & Wang, Yang & Wu, Shuang & Xie, Leidong, 2018. "Preparation and investigation of multicomponent alkali nitrate/nitrite salts for low temperature thermal energy storage," Energy, Elsevier, vol. 160(C), pages 1021-1029.
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