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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

THERMAL CHARACTERISTICS OF MICROENCAPSULATED PHASE-CHANGE MATERIALS

Get access (open in a dialog) DOI: 10.1615/IHTC11.950
pages 121-126

Resumo

As a method to make use of a high latent heat of a liquid-solid phase change material in a confined convective heat transfer, a phase change material, lauric acid, was encapsulated in tiny hollow spheres, and mixed with water, forming a slurry of microencapsulated phase-change material (MCPCM slurry). Four different sizes (200, 100, 50, and 25 μm OD) of MCPCMs were tested in this study.
Thermal characteristics of the pure lauric acid and lauric acid MCPCMs were tested by a differential scanning calorimeter, A zero-heating-rate method was used to obtain phase-change temperatures and phase-change energies of lauric acid and its capsules. The lauric acid itself had almost no super-cooling, while its capsules had consistent value of supercooling, which did not vary for various sizes of capsules. The lauric acid itself had single freezing, while the microencapsulated lauric acid had double freezings. As the size of the capsule became small, the second freezing seemed to be disappeared, which was explained by both the freezing temperature and the freezing energy.