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<p>This study presents the thermal characterization of a latent heat storage composite material composed of a conductive matrix made of compressed expanded natural graphite (CENG) impregnated with RT70HC paraffin-based phase change material (PCM). The particularity of this PCM is that it exhibits a crystallization kinetics with two distinct exothermic transformations. A numerical model that accounts for phase change kinetics was developed for both transformations, incorporating a source term based on the Nakamura differential formulation into the energy equation. The kinetic parameters are determined using two approaches: an isothermal phase change method with a DSC apparatus and an inverse method based on experimental temperature data. The results of both approaches are compared with experimental measurements. The study demonstrates that the isothermal DSC method has limitations in accurately modeling the phase change process, whereas the inverse method yields a better agreement with experimental observations.</p>

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Crystallization kinetic parameters identification of phase change composite material by inverse method

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Mariam Jadal,
  • Jerome Soto,
  • Didier Delaunay

摘要

This study presents the thermal characterization of a latent heat storage composite material composed of a conductive matrix made of compressed expanded natural graphite (CENG) impregnated with RT70HC paraffin-based phase change material (PCM). The particularity of this PCM is that it exhibits a crystallization kinetics with two distinct exothermic transformations. A numerical model that accounts for phase change kinetics was developed for both transformations, incorporating a source term based on the Nakamura differential formulation into the energy equation. The kinetic parameters are determined using two approaches: an isothermal phase change method with a DSC apparatus and an inverse method based on experimental temperature data. The results of both approaches are compared with experimental measurements. The study demonstrates that the isothermal DSC method has limitations in accurately modeling the phase change process, whereas the inverse method yields a better agreement with experimental observations.