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Unravelling the relation between the crystallisation velocity and the hysteresis of phase change materials.

Number: 0035

Author(s) : HIEBLER S., SCHMIT H., TAFELMEIER S., HOOCK P.

Summary

In this work, the relation between the hysteresis of PCM and their crystallisation velocity is investigated with two types of polyethylene glycol: PEG 2000 and PEG 10 000. Calorimetric measurements via differential scanning calorimetry (DSC) show that a notable temperature difference between the enthalpy curves during crystallisation and melting, i.e. the hysteresis, persists even for unusually low heating/cooling rates. The temperature-dependent crystallisation velocities measured for different supercooling temperatures show that the crystallisation velocities for PEG 2000 are generally higher than those for PEG 10 000. A simple explicit finite differences model incorporating the crystallisation velocity was programmed. This simulation tool can be used to simulate DSC enthalpy curves that show good agreement with the measured curves. From the obtained results, it can be concluded, that the crystallisation velocities of the two PEGS, which are too low at supercooling below about 10 K, are the cause of the apparent hysteresis.

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  • Original title: Unravelling the relation between the crystallisation velocity and the hysteresis of phase change materials.
  • Record ID : 30032386
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings:  Paris France, May 29-31, 2024.
  • Publication date: 2024/05/31
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2024.0035

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