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Thermal energy storage (TES) is popular to shift peak-load, eliminate the intermittency of renewable energy and recover industrial waste heat. Molten nitrate salts are the TES materials widely used in solar power plants. Pure nitrate salts show some unfavourable properties and hence composite salts are usually required. Adding nanoparticles into nitrate salts was reported as a good method to enhance their properties. However, it does not always show positive results and the enhancements are sensitive to a number of parameters. Till now, there is also no a robust theoretical model to explain these phenomena due to the lack of enough experimental data. Hence, more experimental studies are needed for promoting the development of theoretical models. In this paper, three molten nitrate salts based nanofluids are synthesized by doping SiO nanoparticles into three popular single salts (NaNO , LiNO and KNO ). Effects of nanoparticle sizes (15 nm 5 μm), mass 2 3 3 3 o fractions (0.5 4%) and temperature (200 380 C) are considered. Thermo-physical properties of the composite materials are tested, including material structure, melting point, latent heat, specific heat capacity and thermal conductivity. Results show that the addition of SiO 2

Experimental Study of Thermo-Physical Characteristics of Molten Nitrate Salts Based Nanof luids for Thermal Energy Storage