Cold-crystallization of polyelectrolyte absorbed polyol for long-term thermal energy storage

Salla Puupponen*, Ari Seppälä

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

A lack of efficient crystallization methods and the metastability of supercooled liquids have limited the use of supercooling phase change materials (PCMs) in long-term thermal energy storage (LTES). Here, we propose a new supercooling PCM-polymer mixture that is not prone to spontaneous crystallization during the storage period. The material releases the stored thermal energy by cold-crystallization on re-heating. The PCM-polymer mixture is composed of supercooling polyol (erythritol or D-mannitol) dispersed in a cross-linked sodium polyacrylate (PAANa) matrix. PAANa efficiently prevents the conventional cooling crystallization of the PCM. Instead of crystallization, the melt polyol supercools and eventually vitrifies as an amorphous solid. Deeply supercooled or vitrified polyol is stable against crystallization below its cold-crystallization temperature. The heat charged and discharged remained similar in 100 repeated melting-crystallization cycles. Its good long-term performance and the stability of the supercooled polyol-PAANa against crystallization at low temperatures make the new material extremely promising for LTES.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume180
DOIs
Publication statusPublished - 15 Jun 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Cold-crystallization
  • Long-term thermal energy storage
  • Phase change material
  • Polyol
  • Supercooling

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