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Subcooling in PCM emulsions. Pt.1: Experimental

: Huang, L.; Günther, E.; Dötsch, C.; Mehling, H.


Thermochimica acta 509 (2010), No.1-2, pp.93-99
ISSN: 0040-6031
Journal Article
Fraunhofer UMSICHT Oberhausen ()
phase change material (PCM); paraffin; water; emulsion; low temperature; Phasenübergangsmaterial; Wasser; Tieftemperatur

Many phase change materials (PCM) tend to subcool in microscopic geometries, even if they show negligible subcooling in macroscopic geometries. This paper presents an experimental study on subcooling and nucleation in paraffin-in-water emulsions. Different material systems with the average dropletsize from 0.2 to12.5 Mym were prepared and analyzed. An increased subcooling up to 15K was observed for small droplets. The paraffin, surfactant and nucleating agent also have impacts on the subcooling. The nucleation theory and the evaluation of the experimental results will be presented in Part 2.