Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Schorne-Pinto, Juliano; Aziziha, Mina; Tisdale, Hunter B.; Mofrad, Amir M.; Birri, Anthony; Christian, Matthew S.; Ard, Johnathon C.; Booth, Ronald E.; Yingling, Jacob A.; Soldan Palma, Jorge Paz; Dixon, Clara; Loye, Hans-Conrad zur; Besmann, Theodore M.

doi:10.1021/acsaem.4c00321

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Journal Article · Mon Apr 22 00:00:00 EDT 2024 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.4c00321· OSTI ID:2361191

^[1]; ^[1]; Tisdale, Hunter B. ^[1]; Mofrad, Amir M. ^[1]; Birri, Anthony ^[2]; ^[1]; Ard, Johnathon C. ^[1]; ^[1]; Yingling, Jacob A. ^[1]; Soldan Palma, Jorge Paz ^[1]; Dixon, Clara ^[1]; ^[1]; Besmann, Theodore M. ^[1]

Univ. of South Carolina, Columbia, SC (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, the thermodynamic properties of the LiF–NaF–KF system and its subsystems were re-evaluated using the CALPHAD method, focusing on the deviations from ideality in the heat capacity [C_p(T)] of mixtures, temperature-dependence of mixing enthalpies (Δ_mixH), vapor pressures of mixtures, and enthalpies of fusion (ΔH_fus) using reported values and measurements. The results of this work confirmed a pseudoternary eutectic at 732.9 K and 46.5LiF–11.5NaF–42KF mol % (FLiNaK) with determined Cp(T) = 69.822 + 0.000679T + 2,137,152T^–2 J mol^–1 K^–1 (732.9 < T < 1200 K) and ΔH_fus = 18,051 J mol^–1 in good agreement to the experimental values. The resulting accurate thermodynamic representation can be used to find relevant excess thermochemical properties in the whole pseudoternary space and provide insights into their composition and temperature dependence. A detailed evaluation of select thermophysical properties was also conducted to determine recommended density, thermal diffusivity, thermal conductivity, vapor pressures, and boiling point with calculated uncertainties over the temperature range of interest for FLiNaK–salt energy applications.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: AC05-00OR22725; NE0008985

OSTI ID:: 2361191

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 9 Vol. 7; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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boiling point
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molten salts
phase diagrams
thermal conductivity
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