Volume 44
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Liu, L., Wang, L., Ge, W., Ge, Y., & Huang, Y. (2019). Effect of particle size on the thermal performance of NaNO3/SiO2/C composite phase-change materials. Particuology, 44, 169-175. https://doi.org/10.1016/j.partic.2018.03.012
Effect of particle size on the thermal performance of NaNO3/SiO2/C composite phase-change materials
Liang Liu a b, Liqiong Wang a, Weichun Ge c, Yanfeng Ge c, Yun Huang b *
a State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
b State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
c State Grid Liaoning Electric Power Supply Co. Ltd., Shenyang 110004, China
10.1016/j.partic.2018.03.012
Volume 44, June 2019, Pages 169-175
Received 22 December 2017, Revised 4 March 2018, Accepted 11 March 2018, Available online 27 September 2018, Version of Record 30 April 2019.
E-mail: yunhuang@ipe.ac.cn

Highlights

• Thermal performance of a composite phase-change material (PCM; NaNO3/SiO2/C) was studied.

• With a diffusion flame system, the thermal shock resistance of the PCM was examined and three scenarios were observed.

• Deterioration of thermal storage density was attenuated as the particle size was increased.


Abstract

Storage of thermal energy is a key technology for energy conservation and application of renewable energy sources. In this paper, the thermal performance of inorganic composite phase-change materials (PCMs; NaNO3/SiO2/C) is studied under extreme thermal conditions and the effect of raw particle size is examined. We designed a thermal shock test platform with a diffusive combustion system and in-situ infrared thermal imaging. The influences of the heat flux magnitude and exposure time on the performance of the PCMs were examined under vertical thermal shock conditions. Leakage of molten salt in the composite PCMs was observed as the heat flux reached a threshold point. The morphology and thermal properties were characterized by ex-situ SEM, XRD, DSC, and BET. Raw particles with sizes in the range of 105–500 μm were used to synthesize the composite material and examine its role in thermal shock behavior. Our experiments showed that deterioration of the thermal storage density was slowed as the particle size was increased. This work provides useful guidance for improving the anti-thermal shock ability of future material designs.

Graphical abstract
Keywords
Thermal storage; Phase change material; Particle size; Thermal shock; Decomposition temperature