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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Novel low melting point binary nitrates for thermal energy storage applications

Ying Li
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China

Yu-ting Wu
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China

Yuanwei Lu
Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conservation, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Chong-Fang Ma
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology, Beijing 100124,China; Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology, Beijing 100124,China

Abstract

19 kinds of different ratio of binary mixed molten salt have been formulated, and the formulation of a low melting point binary molten salt has been exploited and its primary physical and thermodynamic properties were presented here. The eutectic temperature of the selected binary salt mixture was determined to be 116.9°C. Further the decomposition point, specific heat, density, viscosity and thermal conductivity were determined respectively. Sensible thermal storage cost of the novel eutectic mixture was found to be lower than that of conventional solar salt and HITEC salt. The performance of the binary salt mixture taken at different stages during the test of 1200-hours exposure to constant high temperature and after 120 cycles of sudden cold/hot loading with large temperature difference was discussed based on the results obtained from thermal stability studies. The results show that thermodynamic properties of the molten salt show perfect repeatability before and after the experiments, and most variations rate of the thermal physical properties is within ±10 percent, which can be considered as an implication that there is no deterioration of the candidate. Therefore, this new kind of binary molten salt thermal storage materials is more competitive and promising to be used in solar power generation systems while providing a comprehensive data for its engineering application and theoretical research.

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