Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14846
Title: Phase change energy storage system: An analysis of cyclic melting and freezing
Authors: YEO KOK CHUAN, BERNARD
Keywords: phase change materials, paraffin wax, myristic acid, cyclic melting and freezing, storage efficiency, computational fluid dynamics
Issue Date: 12-Aug-2005
Source: YEO KOK CHUAN, BERNARD (2005-08-12). Phase change energy storage system: An analysis of cyclic melting and freezing. ScholarBank@NUS Repository.
Abstract: The thermal performance of a storage system using paraffin wax, myristic acid and a mixture of 50% wax a?? 50% myristic acid, as phase change materials (PCM), is investigated using a heat exchanger consisting of vertically placed, concentric copper tubes. The temperature of the heat transfer medium was from 65-85 A?C during the melting experiments and 25-35 A?C for the freezing experiments. The flow rate for air was varied between 160 a?? 180 l/min. Cyclic melting and freezing experiments were performed on the three PCMs, subjecting the PCMs to different melting and freezing periods. The efficiency, defined as the ratio of the energy withdrawn to the energy stored, was evaluated. Myristic acid has the highest efficiency of 79.5%, followed by wax and the mixture of wax and myristic acid. Numerical studies were performed using FLUENT version 6.0. From the visualization results, the melt front is almost uniform and melt layer stable during the initial period of the phase change process. Plots of heat flux at different heights verify a higher melting rate near the top of the heat exchanger.
URI: http://scholarbank.nus.edu.sg/handle/10635/14846
Appears in Collections:Master's Theses (Open)

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001Title.pdf10.33 kBAdobe PDF

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002Acknowledgements.pdf10.72 kBAdobe PDF

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003Table of Contents.pdf25.43 kBAdobe PDF

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004ExecutiveSummary.pdf23 kBAdobe PDF

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005Nomenclature.pdf35 kBAdobe PDF

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006ListofFigures.pdf17.12 kBAdobe PDF

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007ListofTables.pdf9.46 kBAdobe PDF

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008Ch1Introduction.pdf21.94 kBAdobe PDF

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009Ch2LiteratureReview.pdf66.29 kBAdobe PDF

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010Ch3Experiments.pdf212.39 kBAdobe PDF

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011Ch4NumericalSolution.pdf176.36 kBAdobe PDF

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012Ch5Results.pdf1.42 MBAdobe PDF

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013Ch6Conclusions.pdf15.18 kBAdobe PDF

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014References.pdf24.52 kBAdobe PDF

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015Appendices.pdf162.07 kBAdobe PDF

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