Preparation and thermal properties of quaternary mixed nitrate with low melting point

Mixed molten salt is considered as a promising medium for both heat transfer and energy storage in solar thermal power because of its many advantages such as large heat capacity, low vapor pressure, low cost, wide range of temperature in application, etc. In order to obtain molten salt with lower me...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2014-08, Vol.127, p.6-13
Main Authors: NAN REN, WU, Yu-Ting, MA, Chong-Fang, SANG, Li-Xia
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Energy
Energy accumulation
Energy storage
Energy. Thermal use of fuels
Exact sciences and technology
Fused salts
Heat transfer
Melting points
Natural energy
Nitrates
Solar energy
Solar heating
Solar thermal conversion
Solar thermal power plants
Specific heat
Theoretical studies. Data and constants. Metering
Thermal properties
Transport and storage of energy
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Summary:Mixed molten salt is considered as a promising medium for both heat transfer and energy storage in solar thermal power because of its many advantages such as large heat capacity, low vapor pressure, low cost, wide range of temperature in application, etc. In order to obtain molten salt with lower melting point and higher decomposition temperature, a new kind of nitrate was prepared based on different mixing ratios of KNO sub(3)-NaNO sub(3)-LiNO sub(3)-Ca(NO sub(3)) sub(2) times 4H sub(2)O. Experimental results show that the melting point of some molten salts can be down to below 90 [degrees]C with their decomposition temperature above 600 [degrees]C. The new kind of mixed molten salts has a lower melting point and wider usable temperature range. In addition, other thermal properties such as latent heat of melting, specific heat, density, viscosity, thermal conductivity and thermal stability are measured and analyzed, which are also not worse than that of commonly used mixed molten salt. Therefore, it is a promising medium for both heat transfer and energy storage in solar thermal power plants.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2014.03.056