A Study on the Cooling Characteristics of TMA Clathrate Compound with Additives

Chang Oh Kim; Jin Heung Kim; Nak Kyu Chung

doi:10.4028/www.scientific.net/KEM.326-328.1275

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 326-328A Study on the Cooling Characteristics of TMA...

A Study on the Cooling Characteristics of TMA Clathrate Compound with Additives

Abstract:

This study aims to find out cooling characteristics of TMA 25wt%-water clathrate compound with ethanol such as supercooling, phase change temperature and specific heat. For this purpose, ethanol is added as per weight concentration and cooling experiment is performed at -6, -7 and -8, cooling heat source temperature, and it leads the following result. (1) Phase change temperature is decreased due to freezing point depression phenomenon. Especially, it is minimized as 5.1 and 5.0, 3.8 according to cooling source temperature in case that 0.5wt% of ethanol is added. (2) If 0.5wt% of ethanol is added, average supercooling degree is 0.9 and minimum supercooling is 0.8, 0.7 according to cooling heat source temperature. The restraint effect of supercooling is shown. (3) Specific heat shows tendency to decrease if ethanol is added. It is 3.013~3.048 kJ/kgK according to cooling heat source temperature if 0.5wt% of ethanol is added. Phase change temperature higher than that of water and inhibitory effect against supercooling can be confirmed through experimental study on cooling characteristics of TMA 25wt%-water clathrate compound by adding additive, ethanol.

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Periodical:

Key Engineering Materials (Volumes 326-328)

Pages:

1275-1278

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.326-328.1275

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Online since:

December 2006

Authors:

Chang Oh Kim, Jin Heung Kim, Nak Kyu Chung

Keywords:

Phase Change Temperature, Specific Heat, Supercooling, TMA 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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