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Effects of Expanded Graphite Compound of Different Sizes on Thermal Properties of NaNO3–NaCl/Expanded Graphite

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Abstract

The rational use of energy is of great significance for the long-term stable development of the economy. However, energy such as solar energy and industrial waste heat are difficult to be utilized stably. The development of thermal storage technology can alleviate the instability of energy. In this paper, 96 wt% NaNO3-4 wt% NaCl (NN) was used as the thermal storage material and expanded graphite (EG) was used to adsorb NN binary phase change material (PCM). The effect of EG with different particle sizes on the thermal performance of NaNO3–NaCl/EG composite phase change material (CPCM) was studied. The results showed that the addition of EG reduced the supercooling degree of NN from 4.7 °C to 1.1 °C. The addition of EG powder increased the contact probability between fillers and provided more adsorption positions for PCM, increasing the latent heat of composites. The addition of 32 mesh EG–EG powder greatly increased the thermal conductivity of NN from 1.24 W·m−1·K−1 to 5.43 W·m−1·K−1. It is because the pores of large particle size EG are filled with EG powder, which is easy to form chain or network structure, forming more heat conduction pathways. The research provides some technical support for the application of phase change heat storage technology.

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The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgment

This research is supported by the Science and Technology Commission of Shanghai Municipality under the contract No. 20dz1205208, which is gratefully acknowledged by the authors.

Funding

This research is supported by the Science and Technology Commission of Shanghai Municipality under the contract No. 20dz1205208, which is gratefully acknowledged by the authors.

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Authors and Affiliations

  1. School of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 201306, China

    Yan Li, Kunqiang Ma & Qunzhi Zhu

  2. CSSC Jiujiang Marine Equipment (Group) Co., Ltd., Jiujiang, 332005, China

    Sile Jiang

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  1. Yan Li
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  2. Kunqiang Ma
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  3. Sile Jiang
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  4. Qunzhi Zhu
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Contributions

YL participated in the analysis of the test results and the revision of the manuscript. KM and SJ participated in the test of samples and the preparation of manuscripts. QZ contributed to the analysis through constructive discussions.

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Correspondence to Yan Li or Qunzhi Zhu.

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Li, Y., Ma, K., Jiang, S. et al. Effects of Expanded Graphite Compound of Different Sizes on Thermal Properties of NaNO3–NaCl/Expanded Graphite. Int J Thermophys 45, 15 (2024). https://doi.org/10.1007/s10765-023-03306-y

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  • DOI: https://doi.org/10.1007/s10765-023-03306-y

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