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Nucleation of PCMs in confined geometries

 
: Hagelstein, G.; Gschwander, S.

:
Fulltext urn:nbn:de:0011-n-4225993 (511 KByte PDF)
MD5 Fingerprint: 8eadbb14daebac70d054b2d0f84a6d8e
Created on: 18.8.2017


International Institute of Refrigeration -IIR-; International Institute of Refrigeration -IIR-, Commission Thermodynamics and Transfer Processes, Paris; International Institute of Refrigeration -IIR-, Commission Refrigerating Equipment, Paris; International Institute of Refrigeration -IIR-, Commission Refrigerated Storage, Paris:
11th IIR Conference on Phase Change Materials and Slurries for Refrigeration and Air Conditioning 2016. Proceedings : Karlsruhe, Germany, May 18-20, 2016, CD-ROM
Paris: IIF/IIR, 2016 (Science et technique du froid 2016-2)
ISBN: 978-2-36215-015-9
pp.15-22
Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning (PCM) <11, 2016, Karlsruhe>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()
thermische Anlage; Gebäudetechnik; supercooling; Speichertechnologie; Latentwärmespeicher

Abstract
This work investigates the influence of particle size on crystallization behaviour of microencapsulated and emulsified n-octadecane using differential scanning calorimetry (DSC) and laser diffraction. Analyses of microcapsules show a stepwise decrease of nucleation temperature (from 26 °C to 14 °C) with decreasing particle size (from 300 μm to 3 μm). Further reduction of particle size in emulsions (< 0.2 μm) results in a slight decrease of nucleation temperature (<2 K). Analyses of cooling thermograms of emulsions show two peaks, a minor peak around 8-9 °C and a major peak, which onset nucleation temperature Tc is influenced substantially by the lipophilic character of the surfactants (Tc varies between 13 °C and 22 °C).The minor peak is attributed to the transition from rotator to stable crystal phase and its signal increases with decreasing particle size.

: http://publica.fraunhofer.de/documents/N-422599.html