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정낙규(Nak Kyu Chung),김진흥(Jin Heung Kim),정종헌(Chang Oh Kim),김창오(Jong Hun Chung),강승현(Seung Hyun Kang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The objective of this study is to investigate the effect of supercooling repression on the clathrate compound by adding additives. For this purpose, phase change temperature and supercooling were measured when additives added to TMA30wt% clathrate for heat source temperature of -6℃. The experimental results show that the phase change temperature with the chloroform of 0.1wt% is higher by 0.3C than TMA30wt% and the supercooling with the surfactant 0.1 wt% is reduced by 9.2℃.
정낙규(Nak Kyu Chung),김진흥(Jin Heung Kim),김창오(Chang Oh Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This study is investigated the supercooling improvement and the cooling characteristics of the TMA clathrate compound including TMA(Tri-methyl-amine, (CH₃)₃N) of 25 wt% with additive as a low temperature storage material at -6℃ heat source. The additive is ethanol of 0.1, 0.3 wt% and 0.5 wt%. The results showed that as the concentration of ethanol is increased, phase change temperature, the supercooling and retention time of liquid phase are decreased. Especially, TMA 25 wt% clathrate compound with ethanol of 0.5 wt% has the average of phase change temperature of 3.8℃ supercooling of 0.9℃ and retention time of liquid phase for 6 minutes in the cooling process. From the results of this study, TMA 25 wt% clathrate compound with ethanol showed higher phase change temperature than water and supercooling repression effect.
포접화합물의 열물성에 미치는 첨가제의 효과 (Ⅲ) - TMA 물계 포접화합물에 Acetone을 첨가한 경우 -
김진흥(Jin Heung Kim),정낙규(Nak Kyu Chung),김석현(Suk Hyun Kim),김창오(Chang Oh Kim),강승현(Seung Hyeon Kang) 대한설비공학회 2004 설비공학 논문집 Vol.16 No.12
An experimental investigation is conducted to measure phase change temperature and supercooling when acetone is added to TMA 30 wt% clathrate during cooling process in heat source. Also rate of volume change is investigated when acetone is added to TMA 30 wt% clathrate during the cooling process in heat source -8℃. The results show that phase change temperature is about 4.5~5.5℃ when acetone is added to TMA 30 wt% clathrate during the cooling process for heat sink temperature of -6, -7℃ and -8℃. Supercooling is repressed about 2~10℃ when 0.08 wt% acetone is added to it and rate of volume change is decreased about 2.9% when 0.1 wt% acetone is added for the heat sink temperature of -8℃.
김창오(Kim Chang-Oh),정현호(Chung Hyoun-Ho),정낙규(Chung Nak-Kyu) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The ice storage system uses water for low temperature latent heat storage. However, a refrigerator capacity is increased and COP is decreased due to supercooling of water in the course of phase change from solid to liquid. This study investigates the phase change characteristics of the TMA-water clathrate compound including TMA (Tri-methyl-amine, (CH₃)₃N) of 20~25 wt% as a low temperature latent heat storage material. The results showed that the phase change temperature and the specific heat is increased and the supercooling degree is decreased as the weight concentration of TMA increased. Especially, the clathrate compound containing TMA 25wt% has the average phase change temperature of 5.8℃ and the supercooling degree of 8.0℃ in the cooling process. This can lead to reduction of operation time of refrigerator in low temperature latent heat storage system and efficiency improvement of refrigerator COP and overall system. Therefore, energy saving and improvement of utilization efficiency are expected.