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Thermal performance of a binary carbonate molten eutectic salt for high-temperature energy storage applications
Sun Yat-Sen University, Guangzhou, China.
South China University of Technology, Guangzhou, China.
Sun Yat-Sen University, Guangzhou, China.
Sun Yat-Sen University, Guangzhou, China.
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2020 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 262, article id 114418Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 262, article id 114418
Keywords [en]
Concentrating solar power, Energy storage, Microstructures, Molten carbonates, Thermophysical properties, Binary mixtures, Carbonates, Carbonation, Diffusion in liquids, Digital storage, Eutectics, Fluid Power, Heat storage, Heat transfer, High temperature applications, Microstructure, Molecular dynamics, Molten materials, Salts, Sodium Carbonate, Sodium compounds, Solar energy, Specific heat, Storage (materials), Systems analysis, Temperature distribution, Thermodynamic properties, Thermoelectric power plants, Energy storage applications, Linear temperature dependence, Molten carbonate, Molten carbonate salts, Operating temperature ranges, Self-diffusion coefficients, Solar thermal power plants, Thermal conductivity
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-47103DOI: 10.1016/j.apenergy.2019.114418ISI: 000517398200108Scopus ID: 2-s2.0-85079130336OAI: oai:DiVA.org:mdh-47103DiVA, id: diva2:1395273
Available from: 2020-02-21 Created: 2020-02-21 Last updated: 2020-03-26Bibliographically approved

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Yan, Jinyue

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