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Thermodynamic assessment of binary erythritol-xylitol phase diagram for phase change materials design
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-8493-9802
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
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2018 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 60, p. 29-36Article in journal (Refereed) Published
Abstract [en]

Here, the erythritol-xylitol binary system was thermodynamically optimized based on available experimental phase equilibrium data, to explore compositions suitable as phase change materials (PCMs) for thermal energy storage (TES). A previous experimental study revealed that erythritol-xylitol was a partially isomorphous system with a eutectic. In the thermodynamic evaluation, the CALPHAD method was employed coupling the phase diagram and thermodynamic property information. There, both unary and binary systems’ experimental data were taken into account, and all phases were described using the substitutional solution model. Finally, a self-consistent thermodynamic description for the erythritol-xylitol system was achieved. The calculated eutectic point is at 76.7 °C and 26.8 mol% erythritol, agreeing well with the experimental data. The calculated phase diagram better-verifies the systems’ solidus and the solvus, disclosing the stable phase relations. Based on the Gibbs energy minimization, phase diagrams can be predicted for the binary and higher order systems, provided the component subsystems are thermodynamically assessed beforehand. In conclusion, to move forward beyond e.g. non-isomorphous simple eutectic systems, methods using Gibbs free energy minimization from a fundamental point-of-view such as CALPHAD are essential.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 60, p. 29-36
Keywords [en]
CALPHAD, Erythritol-xylitol phase diagram, Gibbs free energy minimization, Phase change material (PCM), Thermal energy storage (TES), Thermodynamic optimization
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-219591DOI: 10.1016/j.calphad.2017.11.005ISI: 000428000100004Scopus ID: 2-s2.0-85035018780OAI: oai:DiVA.org:kth-219591DiVA, id: diva2:1163929
Note

QC 20171208

Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2018-04-16Bibliographically approved

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Mao, HuahaiBigdeli, SedighehMartin, Viktoria

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