A study on a new cooling storage system with desiccants

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A study on a new cooling storage system with desiccants


Author: Mak, Wai-ho Jonathan
Title: A study on a new cooling storage system with desiccants
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Commercial buildings -- Air conditioning.
Commercial buildings -- Energy consumption.
Energy storage -- Equipment and supplies.
Department: Dept. of Building Services Engineering
Pages: xii, 83 leaves : ill. ; 30 cm.
Language: English
OneSearch: https://www.lib.polyu.edu.hk/bib/b2231989
URI: http://theses.lib.polyu.edu.hk/handle/200/5080
Abstract: Desiccant cooling system has widely been investigated in the past decades. However, little attention has been devoted to the potential of the cooling storage for this system. Since off-peak period has a lower electricity cost, shifting the regeneration process to the nighttime can reduce the operating cost as well as the peak electric demand. 45% concentrated lithium chloride solution with 10% working range was employed in this study. The variation of moisture removal rate by some significant factors was investigated by the finite difference model. The energy and space consumption of the system is estimated and compared with other systems. It is found that half load desiccant cooling storage system can minimize the operating cost, which is lower than that of full load cooling storage and the ice storage system. Besides, the space required by the liquid desiccant cooling storage system is also lower than the ice storage due to the high working range of the desiccant solution, which can remove large amount of latent heat from the process air. This alternative cooling storage system can also benefit from providing independent control of the humidity and the temperature in the air conditioning system. Although finite difference model provides an accurate result, which has been proved by many researches, as this study only simulates the performance by the computer model, the deviation of the theoretical and experimental results cannot be investigated. It is suggested to investigate the potential of employing this cooling storage system in the conventional air conditioning system experimentally in order to obtain the actual performance of this cooling storage system.

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