Abstract
This study is performed to investigate the cooling characteristics of TMA $25\;wt\%$ clathrate compound with an additive; the phase change temperature, the degree of supercooling, specific heat and the rate of volume change. The used additive is ethanol and the heat source temperature is $-7^{\circ}C$. Experimental results are as follows: 1) The phase change temperature is increased by $0.32\~0.96^{\circ}C$ during the cooling process of TMA $25\;wt\%$ clathrate compound with ethanol. 2) The degree of supercooling is repressed by $0.9^{\circ}C$ in case of TMA $25\;wt\%$ clathrate compound with $0.5\;wt\%$ ethanol. 3) The specific heat is increased by $0.19\;kJ/kg^{\circ}C$ in case of TMA $25\;wt\%$ clathrate compound with $0.l\;wt\%$ ethanol. 4) The rate of volume change is decreased by $1.15\~l.5\%$ in case of TMA $25\;wt\%$ clathrate compound with ethanol.
본 연구에서는 TMA $25\;wt\%$-물계 포접화합물에 첨가제를 첨가하며 상변화온도, 과냉도, 비열 그리고 체적변화율의 냉각특성에 대한 실험적 연구를 수행하였다 사용된 첨가제는 에탄올 이며, 냉열원온도는 $-7^{\circ}C$이다. 실험결과들은 다음과 같다. 1) 상변화온도는 $25\;wt\%$-물계 포접화합물에 에탄올을 첨가하여 냉각과정동안 $0.32\~0.96^{\circ}C$가 상승되었다. 2) 과냉도는 TMA $25\;wt\%$-물계 포접화합물에 에탄올 $0.5\;wt\%$를 첨가한 경우에 $0.9^{\circ}C$가 억제되었다. 3) 비열은 TMA $25\;wt\%$-물계 포접화합물에 에탄올 $0.1\;wt\%$를 첨가한 경우에 $0.19\;kJ/kg^{\circ}C$가 증가하였다. 4) 체적변화율은 TMA $25\;wt\%$-물계 포접화합물에 에탄올을 첨가한 경우에 $1.15\~l.5\%$가 감소하였다.
