Effect of nanoparticles on thermal properties of molten salt composite heat storage materials

被引：0

作者：

Yu Q. ^{[1
]}

Lu Y. ^{[1
]}

Zhang X. ^{[1
]}

Wu Y. ^{[1
]}

机构：

[1] College of Environmental and Energy Engineering, Beijing University of Technology, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷

关键词：

Binary nitrate; Composites; Nanoparticles; Silica; Specific heat capacity; Thermal conductivity;

D O I：

10.11949/j.issn.0438-1157.20181516

中图分类号：

学科分类号：

摘要：

In order to study the effects of SiO2 nanoparticles content on the specific heat capacity and thermal conductivity of nano-SiO2/NaNO3-KNO3/EG composite heat storage materials, a series of nano-SiO2/NaNO3-KNO3/EG composites were prepared by mechanical dispersion method. NaNO3-KNO3 and SiO2 nanoparticles with different mass fractions (0.1%, 0.5%, 1%, 2%, 3%) were used as heat storage materials and expanded graphite (EG) was used as matrix material. Then the specific heat and the thermal diffusivity of composite heat storage materials were measured, and the microstructural characteristics were analyzed by scanning electron microscopy (SEM). The results show that adding 1% of SiO2 nanoparticles to the composite can significantly affect its average specific heat capacity and thermal conductivity, with a measured value of 3.92 J/(g•K) and 8.47 W/(m•K), respectively, which are 1.37-2.17 times and 1.7-3.2 times higher than that of the other similar composites. This is owed to its high density network nanostructure with the large specific surface area and high surface energy which can improve the specific heat capacity and thermal conductivity. © All Right Reserved.

引用

页码：217 / 225

页数：8

共 31 条

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