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Semi-empirical Density Estimations for Binary, Ternary and Multicomponent Alkali Nitrate–Nitrite Molten Salt Mixtures

  • Thomas Bauer
  • Alexander Bonk
Article
  • 62 Downloads

Abstract

For sensible thermal energy storage in Concentrating Solar Power (CSP) plants, a molten salt mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3), known as Solar Salt, is commonly utilized. The paper presents semi-empirical estimation results of the density of Solar Salt and alternative molten salt mixtures with low melting temperatures in a range from 70 °C to 140 °C. These mixtures are Hitec, HitecXL, LiNO3–KNO3–NaNO3 and a multicomponent mixture. The paper shows that density values of mixtures can be closely predicted from single salt densities. The paper examines different estimation rules for mixtures. The quasilinear volumetric additivity rule (QVAR) is known for ternary reciprocal systems. For the first time, the presented work extends the QVAR to multicomponent mixtures. Temperature-dependent densities of selected salt mixtures of the system Ca,Li,K,Na//NO2,NO3 were estimated. Estimations are motivated by a fast and reliable method compared to time-consuming and error-prone measurements of several mixtures.

Keywords

Concentrating Solar Power (CSP) Hitec HitecXL Multicomponent salts Quasilinear volumetric additivity rule 

List of symbols

a

Density coefficient g/cm3

b

Temperature-dependent density coefficient g/(cm3K)

V

Molar volume cm3/mol

Vi

Molar volume of i cm3/mol

M

Molecular weight g/mol

Mi

Molecular weight of i g/mol

ρ

Density g/cm3

Xi

Mol fraction of i 1

T

Temperature °C

E

Deviation of estimated density value %

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Authors and Affiliations

  1. 1.German Aerospace Center (DLR)Institute of Engineering ThermodynamicsCologneGermany
  2. 2.German Aerospace Center (DLR)Institute of Engineering ThermodynamicsStuttgartGermany

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