한국태양에너지학회:학술대회논문집

The Korean Solar Energy Society (한국태양에너지학회)
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TMA-Water Clathrate Compound of Cooling Characteristics for Low Temperature Latent Heat Storage

저온잠열축열을 위한 TMA-물계 포접화합물의 냉각특성

  • Kim, Chang-Oh (Dept. of Mechanical Design Eng., Graduate School, Chosun University) ;
  • Chung, Hyoun-Ho (Dept. of Advanced Parts and Materials Eng., Chosun University) ;
  • Chung, Nak-Kyu (Dept. of Mechanical Design Eng., Chosun University)
  • 김창오 (조선대학교 대학원 기계설계공학과) ;
  • 정현호 (조선대학교 대학원 첨단부품소재공학과) ;
  • 정낙규 (조선대학교 기계설계공학과)
  • Published : 2009.04.10
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Abstract

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, $(CH_3)_3N)$ of $20{\sim}25wt%$ 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 $5.8^{\circ}C$, the supercooling degree of $8.0^{\circ}C$ and the specific heat of 3.499 kJ/kgK 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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