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      • 저온잠열축열을 위한 TMA-물계 포접화합물의 냉각특성

        김창오(Kim Chang-Oh),정현호(Chung Hyoun-Ho),정낙규(Chung Nak-Kyu) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-

        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 cooling 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℃, the supercooling degree of 8.0℃ and the specific heat of 3.499 kJ/㎏K 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.

      • TMA 농도에 따른 저온잠열축열물질의 냉각특성

        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.

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