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Energy storage system based on nanoparticle-enhanced phase change material inside porous medium

刊名：	International Journal of Thermal Sciences
作者：	Hossain, Rakib（Univ Guelph, Sch Engn, Guelph, ON N1G 2W1, Canada） Mahmud, Shohel（Univ Guelph, Sch Engn, Guelph, ON N1G 2W1, Canada） Dutta, Animesh（Univ Guelph, Sch Engn, Guelph, ON N1G 2W1, Canada） Pop, Ioan（Univ Babes Bolyai, Dept Math, Cluj Napoca 400084, Romania）
刊号：	725F0002
ISSN：	1290-0729
出版年：	2015
年卷期：	2015, vol.91
页码：	49-58
总页数：	10
分类号：	TK1
关键词：	Energy storage；Fourier number；Nano-PCM；Melt fraction；Porosity；Stefan number；Volume fraction
参考中译：
语种：	eng
文摘：	A Nanoparticle-enhanced phase change material contains high thermal conductivity nanoparticles, which are assumed to be dispersed uniformly into the phase change material. The inclusion of the nanoparticles improves the effective value of thermal conductivity of the nanoparticle-enhanced phase change material (or nano-PCM). The effective heat transfer rate of nano-PCM can be improved further by incorporating a porous medium. This is the first paper in this series, which reports thermal performance of an energy storage system filled with a porous medium and the void space inside the porous medium is occupied by a nano-PCM. A 2-D enclosure is considered to replicate energy storage system. Two vertical walls and the bottom wall of the enclosure are properly insulated. The nano-PCM (Cyclohexane + CuO nanoparticle) is considered initially at its melting temperature. The top surface of the enclosure is suddenly exposed to a thermal source having a temperature above the melting temperature of the nanoPCM. The effect of the volume fraction of nano-particle and porosity of the porous medium are studied on temperature distribution, heat transfer, and melt fraction inside the cavity. A two dimensional thermal model is developed for both solid and liquid fractions of the nano-PCM. The modeled equations are solved numerically using initial, boundary, and interface conditions. A scale analysis is executed to establish simplified relationships between different non-dimensional parameters (i.e., Fourier number, Stefan number, porosity, and volume fraction). (C) 2015 Elsevier Masson SAS. All rights reserved.