Preparation and thermophysical properties of novel mixed nitrate molten salts

doi:10.19799/j.cnki.2095-4239.2020.0237

Abstract

Abstract:

Five mixed nitrate molten salts were prepared via the addition of either Additive A or Additive B into the binary formula, i.e. 47% Ca(NO₃)₂-53% KNO₃, and the thermophysical properties were measured. The results indicated that the working temperature range of the mixed molten salts was extended compared to solar salt, with the lowest freezing point at 135.2 ℃ and the highest decomposition temperature at 639.1 ℃. The optimum formula containing 34% Additive B demonstrates a thermal energy density and a thermal conductivity as high as 734 kJ/kg and 0.74 W/(m·K), respectively. A comprehensive analysis of the various thermophysical properties of mixed molten salts indicate that compared to traditional solar salt and Hitec salt, the developed salts demonstrate superior performance and are good candidates for application as a heat transfer and storage medium in concentrating solar power technologies.

Key words: concentrating solar power, molten salt, heat transfer and storage medium, thermophysical property

CLC Number:

TQ 11

Peng SHENG, LI XU, Guangyao ZHAO, Yan HAN, Yuting WU. Preparation and thermophysical properties of novel mixed nitrate molten salts[J]. Energy Storage Science and Technology, 2021, 10(1): 170-176.

Figures/Tables 1

References 17

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