Thermal behavior of PCMs during phase transitions with phase change hysteresis: Experimental setup development and problems of model validation

článek ve sborníku ve WoS nebo Scopus

en

Various models and approaches for phase transitions of phase change materials (PCMs) have been proposed in recent years. However, many of these models lack validation with experimental data, particularly the models for phase change hysteresis (PCH) and incomplete (partial) phase transitions. To address this issue, an experimental setup was designed, assembled and tested for potential validation of numerical models. The experiments involve monitoring of the heat flux and the temperature distribution in a PCM contained in a rectangular cavity with a heated/cooled wall. Peltier cells are used to introduce positive or negative heat flux – heating and cooling of the PCM. The first sets of experiments were conducted with the RT35HC paraffin-based PCM. The ultimate goal of the experiments is to provide experimental data for solving inverse heat transfer problems, specifically the identification of the relationships between the enthalpy and temperature during complete and incomplete phase transitions of a PCM. The results suggest that in order to properly account for the influence of natural convection in liquid PCM, a more appropriate experimental setup that avoids its effects or a more suitable modelling approach is required.

Various models and approaches for phase transitions of phase change materials (PCMs) have been proposed in recent years. However, many of these models lack validation with experimental data, particularly the models for phase change hysteresis (PCH) and incomplete (partial) phase transitions. To address this issue, an experimental setup was designed, assembled and tested for potential validation of numerical models. The experiments involve monitoring of the heat flux and the temperature distribution in a PCM contained in a rectangular cavity with a heated/cooled wall. Peltier cells are used to introduce positive or negative heat flux – heating and cooling of the PCM. The first sets of experiments were conducted with the RT35HC paraffin-based PCM. The ultimate goal of the experiments is to provide experimental data for solving inverse heat transfer problems, specifically the identification of the relationships between the enthalpy and temperature during complete and incomplete phase transitions of a PCM. The results suggest that in order to properly account for the influence of natural convection in liquid PCM, a more appropriate experimental setup that avoids its effects or a more suitable modelling approach is required.

Inverse heat transfer problem; Phase change hysteresis; Phase change materials

05.02.2024

ASME

New Orleans, Louisiana, USA

978-0-7918-8770-7

ASME 2023 International Mechanical Engineering Congress and Exposition

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