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.
Superconductivity in the Silicon Clathrate Compound (Na,Ba)xSi46