A Study on Supercooling Characteristics of Clathrate Compounds with Concentration of TMA

Chang Oh Kim; Jin Heung Kim; Nak Kyu Chung

doi:10.4028/www.scientific.net/MSF.544-545.645

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HomeMaterials Science ForumMaterials Science Forum Vols. 544-545A Study on Supercooling Characteristics of...

A Study on Supercooling Characteristics of Clathrate Compounds with Concentration of TMA

Abstract:

Ice storage system that water is used as low temperature latent heat storage material, refrigerator capacity is increased and COP is decreased because refrigerator is operated at low temperature due to supercooling of water in the course of phase change from solid to liquid. This study is investigated 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 at -5°C, cooling source temperature. The results showed that the phase change temperature, the specific heat is increased and the supercooling degree is decreased as the weight concentration of TMA became higher. Especially, low temperature latent heat storage material containing TMA 25 wt% has the average of phase change temperature of 5.8°C, supercooling degree of 8.0°C and specific heat of 4.099kJ/kgK in the cooling process. Phase change temperature higher than that of water and inhibitory effect against supercooling can be confirmed through experimental study on cooling characteristics of TMA-water clathrate compound.

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Periodical:

Materials Science Forum (Volumes 544-545)

Pages:

645-648

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.544-545.645

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Online since:

May 2007

Authors:

Chang Oh Kim, Jin Heung Kim, Nak Kyu Chung

Keywords:

Low Temperature Latent Heat Storage Material, Phase Change Temperature, Specific Heat, Supercooling Degree, TMA-Water Clathrate Compound

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References

[1] I. S. Chung, Y. G. Kim, J. S. Lee and S. T. Ro: An experimental study on the performance of cool storage system using R141b clathrate., Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 6, No. 4, pp.354-364 (1994).

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[2] J. H. Kim, N. K. Chung, S. H. Kim and C. O. Kim: The Effects of Additives on the Cooling Characteristic of a Clathrate Compound., Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 17, No. 2, pp.125-130 (2005).

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