Behavior of a PCM at Varying Heating Rates: Experimental and Theoretical Study with an Aim at Temperature Moderation in Radionuclide Concrete Encasements

Abstract

Phase-change materials (PCMs) can store/release thermal energy within a small temperature range. This is of interest in various industrial applications, for example, in civil engineering (heating/cooling of buildings) or cold storage applications. Another application may be the moderation of temperature increases in concrete encasements of radionuclides during their decay. The phase-change behavior of a material is determined by its heat capacity and the peak it exhibits near a phase change. We analyze the behavior of such peaks for a selected PCM at heating rates varying between \(0.1\,^{\circ }\hbox {C}\cdot \hbox {min}^{-1}\) and \(1\,^{\circ }\hbox {C}\cdot \hbox {min}^{-1}\), corresponding in real situations to different decay rates of radionuclides. We show that experimentally measured peaks can be plausibly described by an equilibrium theory that enables us to calculate the latent heat and phase-change temperature from experimental data.

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Acknowledgements

This research was supported by the Czech Science Foundation, Project No. 17-11635S.

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Correspondence to Igor Medved’.

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Medved’, I., Trník, A. Behavior of a PCM at Varying Heating Rates: Experimental and Theoretical Study with an Aim at Temperature Moderation in Radionuclide Concrete Encasements. Int J Thermophys 39, 83 (2018). https://doi.org/10.1007/s10765-018-2408-x

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Keywords

  • Heat capacity
  • Latent heat
  • Phase-change material
  • Radionuclide encasement