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Thermostatic properties of nitrate molten salts and their solar and eutectic mixtures.

Abstract：

:Nitrate molten salts are extensively used for sensible heat storage in Concentrated Solar Power (CSP) plants and thermal energy storage (TES) systems. They are the most promising materials for latent heat storage applications. By combining classical molecular dynamics and differential scanning calorimetry experiments, we present a systematic study of all thermostatic, high temperature properties of pure KNO3 and NaNO3 salts and their eutectic and "solar salt" mixtures, technologically relevant. We first study, in solid and liquid regimes, their mass densities, enthalpies, thermal expansion coefficients and isothermal compressibilities. We then analyze the cP and cV specific heats of the pure salts and of the liquid phase of the mixtures. Our theoretical results allow to resolve a long-standing experimental uncertainty about the cP(T) thermal behaviour of these systems. In particular, they revisit empirical laws on the cP(T) behaviour, extensively used at industrial level in the design of TES components employing the "solar salt" as main storage material. Our findings, numerically precise and internally consistent, can be used as a reference for the development of innovative nanomaterials based on nitrate molten salts, crucial in technologies as CSP, waste heat recovery, and advanced adiabatic compressed air energy storage.

journal_name

Sci Rep

journal_title

Scientific reports

authors

D'Aguanno B,Karthik M,Grace AN,Floris A

doi

10.1038/s41598-018-28641-1

subject

Has Abstract

pub_date

2018-07-11 00:00:00

pages

10485

issue

1

issn

2045-2322

pii

10.1038/s41598-018-28641-1

journal_volume

8

pub_type

杂志文章

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