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[摘要]：Heat storage experiment by natural convection in rectangular enclosures heated from bottom has been conducted with fluid slurry composed of microencapsulated phase change material (PCM). The microencapsulated PCM is prepared by in-situ polymerization method, where the core materials are composed of several kinds of n-paraffin waxes (mainly nonadecane) and the membrane is a type of melamine resin. Its slurry mixed with water is used in this study, and shows a peak value in the specific heat capacity with latent heat at the temperature of about T=31 degrees C. The influences of the phase change material on heat storage and the heat transfer process, as well as effects of PCM mass concentration C(m) on the microcapsule slurry, temperature of heat storage T(H) and a horizontal enclosure height H are also investigated. Transient heat transfer coefficient alpha, heat storage capacity Q and completion time of heat storage t(c) are discussed. (C) 2011 Elsevier B.V. All rights reserved. |
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