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Nanoadditives induced enhancement of thermal energy storage properties of molten salt: Insights from experiments and molecular dynamics simulations by Liu Cui; Qingsheng Yu; Chao Huang; Yaru Zhang; Yao Wang; Gaosheng Wei; Xiaoze Du is a Engineering article available to read on EtoBox.

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Current concentrated solar power (CSP) plants use molten salts as heat storage and heat transfer medium. The thermal property enhancement of molten salts can increase the efficiency and lower the investment cost of CSP plants. In this study, the experiments and molecular dynamics (MD) simulations were employed to investigate the effect of doping Al 2 O 3 , SiO 2 nanoparticles or multi-walled carbon nanotubes (MWCNTs) on the specific heat capacity (SHC) of ternary carbonate salt. The results show that the SHC of molten salt can be enhanced by adding nanoadditives. The addition of MWCNTs has the largest SHC enhancement in both solid and liquid states. Based on MD simulations, the radial distribution functions, number density distribution and vibrational density of states were further analyzed to reveal the effect of nanoadditive, base salt and interface thermal resistance between them on SHC at different temperatures. It is found that the nanoadditive agglomeration, the ion spacing of base salt, and the thermal resistance between base salt and nanoadditive is independent on temperature and cannot result in the enhanced SHC of liquid nanocomposites. Moreover, the thickness of interfac

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Author

Liu Cui; Qingsheng Yu; Chao Huang; Yaru Zhang; Yao Wang; Gaosheng Wei; Xiaoze Du

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)