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Heat Accumulation by Wax Polydisperse Nanomaterials with Phase Transition

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Powder Metallurgy and Metal Ceramics Aims and scope

Materials that accumulate latent heat have become attractive to many aspects of human activity. However, their use is often limited by the issues of low thermal conductivity. Also, the transition from a solid to a molten state causes difficulties in storing materials, requiring special heat exchangers, which increases energy costs. These issues can be addressed by generating polydispersed powders for heat storage. Some shape-stable materials with a phase transition were obtained from melts by mixing halloysite nanotubes with carnauba wax. As a result, several solid samples of wax/nanotube were prepared by grinding at a 70/30, 60/40, and 50/50 mass ratio. Pure wax demonstrated the heat of the phase transition from solid to liquid state at 189.09 J/g. The latent heat of carnauba wax is approximately 25% greater than paraffin's. The created composite materials had a lower latent heat than wax, namely 99.39, 90.25, and 81.26 J/g for 70/30, 60/40, and 50/50 samples, respectively. Elementary mapping of nanomaterials revealed a uniform distribution of nanotubes in the waxy mass. According to X-ray diffraction analysis, the components did not form new crystallines during material preparation but manifested in the materials as physical mixtures. Also, the components did not chemically interact with each other when heated, which is a valuable property in the accumulation of thermal energy materials. It was found that the energy absorbed value and given heat by wax weighing 4 g, depending on weather conditions, was 26.96–242.60 J and 49.22–150.02 J.

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Acknowledgments

The work was performed with partial support of the Swedish SSF foundation

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Authors and Affiliations

  1. The Gas Institute, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    K.V. Simeiko, M.A. Sydorenko & S. Ya. Brichka

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  1. K.V. Simeiko
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  2. M.A. Sydorenko
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  3. S. Ya. Brichka
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Correspondence to S. Ya. Brichka.

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Published in Poroshkova Metallurgiya, Vol. 61, Nos. 5–6 (545), pp. 16–25, 2022.

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Simeiko, K., Sydorenko, M. & Brichka, S.Y. Heat Accumulation by Wax Polydisperse Nanomaterials with Phase Transition. Powder Metall Met Ceram 61, 269–277 (2022). https://doi.org/10.1007/s11106-022-00314-9

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