Study on thermal stability of molten salt composites added with SiO2 nanoparticles

doi:10.3969/j.issn.2097-0706.2023.09.005

Abstract

Abstract:

Molten salt nanofluid shows excellent performance in heat transfer and storage， but its thermal stability in heat storage/release process is crucial since the material has to undergo numerous similar cycles once it is taken as heat transfer and storage medium. Molten salt composites with different formulations were prepared by high-temperature melting method，and their heat storage/release performance was tested on a self-designed test bench. The measured samples were taken at a same time interval， and their melting point， latent heat， thermogravimetry， specific heat and thermal conductivity were tested by differential scanning calorimetry and laser flash. The relationship of the thermophysical properties of the molten salt composites with their ingredients and the number of heat storage/release cycles were obtained. It is found that the composite added with 1.0% SiO₂ has a lower melting point， a wider temperature range for operation， and requires a lower investment in the thermal storage system， while the composite added with 0.5%SiO₂ has a better specific heat capacity than those of other composites with SiO₂of different ratios.

Key words: molten salt nanofluid, thermal energy storage performance, thermal cycling, stability, thermogravimetry, high-temperature melting, energy storage

CLC Number:

TK124：TB383.1

MENG Qiang, YANG Yang, XIONG Yaxuan. Study on thermal stability of molten salt composites added with SiO₂ nanoparticles[J]. Integrated Intelligent Energy, 2023, 45(9): 32-39.

Figures/Tables 10

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References 15

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样品	w（SiO₂）/%	颗粒粒径/nm
NaNO₃+KNO₃+SiO₂	0.3	20
NaNO₃+KNO₃+SiO₂	0.5	20
NaNO₃+KNO₃+SiO₂	0.7	20
NaNO₃+KNO₃+SiO₂	1.0	20

样品	比热容/[J·(g·K)^-1]	冷热循环	参考文献
solar salt +3%SiO₂	1.73	无	[9]
solar salt +1%SiO₂	3.92	无	[11]
NaNO₃+KNO₃+0.5%SiO₂	6.30	150次	本文试验
	6.50	300次
	5.90	450次
	5.40	600次

Study on thermal stability of molten salt composites added with SiO₂ nanoparticles

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