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김진흥,정낙규,김석현,김창오,강승현 대한설비공학회 2004 설비공학 논문집 Vol.16 No.3
The ice thermal storage system is to use congelation latent heat of water. But, supercooling phenomenon of water during phase change is to increase the cooling capacity and to decrease COP of the refrigerator. Furthermore, this causes the operation cost of system to increase and the efficiency of energy to decrease. Therefore, the better thermal storage material than the water is required. The purpose of this study is to improve supercooling characteristics and thermal properties of TMA 30 wt% clathrate by using Ethanol.
김진흥,정낙규,김석현,김창오 대한설비공학회 2005 설비공학 논문집 Vol.17 No.2
This study was performed to investigate the phase change temperature, the supercooling, the maintenance time of liquid phase and the change rate of volume of TMA 30 wt% clathrate compound with additives. TMA 30 wt% clathrate compound with additive was cooled at heat source temperature of -6℃. The additives are ethylene glycol and chloroform. Their concentration are 0.1 wt% respectively. The experimental results showed that the phase change temperature was not affected by additives and this was average 5.3℃. Also the supercooling and the maintenance time of liquid phase were decreased by additives. Especially, the average value of supercooling showed by 8.8℃ and the maintenance time of liquid phase was by 19 minutes in the case of chloroform 0.1wt%. Additionally, the average change rate of volume showed by 1.26∼1.31% according to additives and the volume was decreased by the phase change from liquid to solid.