The Impact of Non-Ideal Phase Change Properties on Phase Change Thermal Energy Storage Device Performance

Sampath Kommandur, Allison Mahvi, Alexander Bulk, Adewale Odukomaiya, Anastasia Aday, Jason Woods

Research output: Contribution to journalArticlepeer-review


Phase change materials have been known to improve the performance of energy storage devices by shifting or reducing thermal/electrical loads. While an ideal phase change material is one that undergoes a sharp, reversible phase transition, real phase change materials do not exhibit this behavior and often have one or more non-idealities – glide, hysteresis, supercooling – associated with them. Experimental and modeling techniques to characterize these non-ideal properties are reasonably well understood, however, their impact on the performance of a thermal energy storage system is not fully understood. Here, we analyze the performance of a heat exchanger with a phase change material as a function of the different non-idealities, for a heating and a cooling application. We focus on the impact of these non-ideal behaviors on different modes of operation of the thermal energy storage device, which will serve as a useful guide to researchers on the relative importance of the non-ideal properties, along with the necessary accuracy required during an experimental characterization.

Original languageAmerican English
Article number108470
Number of pages14
JournalJournal of Energy Storage
Issue numberPart D
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

NREL Publication Number

  • NREL/JA-5500-84572


  • Heat exchanger
  • Melting
  • Non-ideal behavior
  • Phase change material
  • Solidifying
  • Supercooling


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