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Issue 18, 2017
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Thermodynamic modeling and experimental verification of a NaNO3–KNO3–LiNO3–Ca(NO3)2 system for solar thermal energy storage

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Abstract

A quaternary system, NaNO3–KNO3–LiNO3–Ca(NO3)2, was predicted using the extended symmetric Kohler model to be a molten mixture with a low melting point that can be used as a heat storage and transfer fluid in concentrating solar power. The predicted eutectic temperature and composition of this system are 98.30 °C and 9.5 mol% NaNO3, 52.8 mol% KNO3, 27.6 mol% LiNO3 and 10.1 mol% Ca(NO3)2. Differential scanning calorimetry and thermogravimetric analysis were used to measure the predicted eutectic mixture. The results showed that the salt mixture has a low melting point of 95.96 °C, which coincides with the predicted eutectic temperature (98.30 °C), a moderate heat of fusion of 64.88 J g−1, and a thermal stability temperature of 450 °C. Therefore, this quaternary eutectic salt is suitable for use as a heat storage and transfer medium in solar thermal power plants.

Graphical abstract: Thermodynamic modeling and experimental verification of a NaNO3–KNO3–LiNO3–Ca(NO3)2 system for solar thermal energy storage

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Publication details

The article was received on 08 Jun 2017, accepted on 03 Aug 2017 and first published on 03 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ02051A
Citation: New J. Chem., 2017,41, 10376-10382
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    Thermodynamic modeling and experimental verification of a NaNO3–KNO3–LiNO3–Ca(NO3)2 system for solar thermal energy storage

    F. Xu, J. Wang, X. Zhu and X. Liu, New J. Chem., 2017, 41, 10376
    DOI: 10.1039/C7NJ02051A

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