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Polyols as phase change materials for surplus thermal energy storage
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Thermal Energy Storage (TES))ORCID iD: 0000-0002-1806-9749
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Department of Chemistry, Ångström Laboratory, Uppsala University, Box 538 75121 Uppsala, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Thermal Energy Storage)ORCID iD: 0000-0001-6982-2879
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. (Thermal Energy Storage (TES))ORCID iD: 0000-0001-9556-552X
2016 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 162, 1439-1452 p.Article in journal (Refereed) Published
Abstract [en]

Storing low-temperature surplus thermal energy from industries, power plants, and the like, using phasechange materials (PCM) is an effective alternative in alleviating the use of fossil based thermal energyprovision. Polyols; of some also known as sugar alcohols, are an emerging PCM category for thermalenergy storage (TES). A review on polyols as PCM for TES shows that polyols have phase change temperaturesin the range of 15 to 245 C, and considerable phase change enthalpies of 100–413 kJ/kg. However,the knowledge on the thermo-physical properties of polyols as desirable PCM for TES design is presentlysparse and rather inconsistent. Moreover, the phase change and state change behaviors of polyols need tobe better-understood in order to use these as PCM; e.g. the state change glass transition which manypolyols at pure state are found to undergo. In this work preliminary material property characterizationwith the use of Temperature-History method of some selected polyols, Erythritol, Xylitol andPolyethylene glycol (PEG) 10,000 were done. Complex behaviors were observed for some of the polyols.These are: two different melting temperatures, 118.5–120 C and 106–108 C at different cycles and anaverage subcooling 18.5 C of for Erythritol, probable glass-transition between 0 and 113 C for Xylitol,as well as a thermally activated change that is likely an oxidation, after three to five heating/coolingcycles for Xylitol and Erythritol. PEG 10,000 had negligible subcooling, no glass-transition nor thermallyactivated oxidation. However a hysteresis of around 10 C was observed for PEG 10,000. Therefore thesematerials require detailed studies to further evaluate their PCM-suitability. This study is expected to be an initiation of an upcoming extensive polyol-blends phase equilibrium evaluation.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 162, 1439-1452 p.
Keyword [en]
Phase change materials (PCM) Polyols, T-history method, Material properties, Glass transition, Thermally activated change
National Category
Energy Engineering
Research subject
Energy Technology
URN: urn:nbn:se:kth:diva-165079DOI: 10.1016/j.apenergy.2015.03.064ISI: 000367631000126ScopusID: 2-s2.0-8492238551OAI: diva2:807173
ICAE (International Conference on Applied Energy) 2014
Swedish Energy Agency, project number 34948-1
Swedish Energy Agency, 34948-1

QC 20160205

Available from: 2015-04-22 Created: 2015-04-22 Last updated: 2016-02-05Bibliographically approved

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