Performances of the a new thermal storage material combined with chilled-ceiling system

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Performances of the a new thermal storage material combined with chilled-ceiling system

 

Author: Han, Yu
Title: Performances of the a new thermal storage material combined with chilled-ceiling system
Degree: M.Eng.
Year: 2008
Subject: Hong Kong Polytechnic University -- Dissertations.
Heat storage.
Cooling towers.
Energy consumption.
Department: Dept. of Building Services Engineering
Pages: xiv, 79 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2231995
URI: http://theses.lib.polyu.edu.hk/handle/200/4080
Abstract: The electricity charge in daytime is much higher than that in nighttime. A prevalent method which uses the electricity for to store cooling in a phase change material in nighttime can save a lot of money because the nighttime tariff is much cheaper than that in daytime in many places. This dissertation is aimed to assess the performances of a new thermal storage materials combined with a radiant ceiling cooling system. Four main groups of experiments and tests were conducted in order to achieve the objectives. The results of heat balance measurement indicate that the errors between thermal energy supply and thermal were all less than 5%. Most of the errors are less than 1%. Three significant findings are obtained from the current study. The first is that the latent heat of the C16H34 which was detected by the Differential Scanning Calorimeter (DSC) was almost the same with that of assessed by the practical running in the hybrid system. This phenomena proves that the DSC result is dependable. The second is that the change trend of convective heat transfer coefficient needs to be divided into two phases. The last one is that a pattern has been found which is used for expressing the relationship between the stir velocity and the convective heat transfer coefficient of this MPCM. The results from this dissertation are useful for users to find a suitable stir velocity for this kind of MPCM slurry to achieve the best thermal performance in practical applications. The damage to the MPCM particles which is caused by the stir should be further investigated.

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