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Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>·10H<sub>2</sub>O 열분해 반응속도의 비등온해석
최호상,박영태,이수각,Choi, Ho-Sang,Park, Young-Tae,Lee, Soo-Kag 한국공업화학회 1997 공업화학 Vol.8 No.6
본 연구에서는 $Na_2B_4O_7{\cdot}10H_2O$의 열분해 반응계를 이용하여 축열식 열교환기에 적용하기 위한 반응속도의 비등온 해석에 대한 기초연구를 수행하였다. $Na_2B_4O_7{\cdot}10H_2O/Na_2B_4O_7{\cdot}5H_2O$ 계에서 반응의 평형온도가 373K 이하의 저온 온도범위에서 화학축열재로 적합하였으며, 열효율이 일정하여 장시간 사용할 수 있었다. 계 내의 반응 개시온도는 가열속도 증가에 따라 저온 영역에서 고온영역으로 이동하였으며, 수증기 분압의 변화가 있어도 저하되지 않았다. 열분해 탈수반응에 의한 반응속도식의 차수는 0.67차로서 반응의 비등온 해석에 의하여 화학축열재로 사용할 수 있었다. Fundamental research of non-isothermic analysis of reaction rate has been carried out for the heat storage system using the thermal decomposition of $Na_2B_4O_7{\cdot}10H_2O$. It was found that the equilibrium temperature of the thermal decomposition reaction was lowered less than 373K in $Na_2B_4O_7{\cdot}10H_2O/Na_2B_4O_7{\cdot}5H_2O$ system, but the heat efficiency was unchanged. The initiation temperature of the reaction was varied from low to high temperature region with heating rate. The reaction order of the dehydration reaction by the thermal decomposition was appeared to be 0.67 by non-isothermic analysis, thereby $Na_2B_4O_7{\cdot}10H_2O$ may be used as a hemical heatstorage material.
Na2B4O7 , 10H2O 열분해 반응속도의 비등온해석
최호상,박영태,이수각 ( Ho Sang Choi,Young Tae Park,Soo Kag Lee ) 한국공업화학회 1997 공업화학 Vol.8 No.6
본 연구에서는 Na₂B₄O_7·10H₂O의 열분해 반응계를 이용하여 축열식 열교환기에 적용하기 위한 반응속도의 비등온 해석에 대한 기초연구를 수행하였다. Na₂B₄O_7·10H₂O/Na₂B₄O_7·5H₂O 계에서 반응의 평형온도가 373K 이하의 저온 온도범위에서 화학축열재로 적합하였으며, 열효율이 일정하여 장시간 사용할 수 있었다. 계 내의 반응 개시온도는 가열속도 증가에 따라 저온영역에서 고온영역으로 이동하였으며, 수증기 분압의 변화가 있어도 저하되지 않았다. 열분해 탈수반응에 의한 반응속도식의 차수는 0.67차로서 반응의 비등은 해석에 의하여 화학축열재로 사용할 수 있었다. Fundamental research of non-isothermic analysis of reaction rate has been carried out for the heat storage system using the thermal decomposition of Na₂B₄O_7·0H₂O. It was found that the equilibrium temperature of the thermal decomposition reaction was lowered less than 373K in Na₂B₄O_7·10H₂O/Na₂B₄O_7·5H₂O system, but the heat efficiency was unchanged. The initiation temperature of the reaction was varied from low to high temperature region with heating rate. The reaction order of the dehydration reaction by the thermal decomposition was appeared to be 0.67 by non-isothermic analysis, thereby Na₂B₄O_7·10H₂O may be used as a hemical heatstorage material.
CaSO₄1/2 H₂O/CaSO₄계 열화학 반응사이클을 이용한 화학 축열에 관한 연구
朴永泰,崔浩尙,李壽珏 慶一大學校 1993 論文集 Vol.9 No.1
The present paper is concerned with the thermal energy storage by means of a CaSO₄·1/2H₂O/CaSO₄thermochemical reaction cycles. This reaction cycle was applied to a packed-bed type thermal energy unit. The heat release characteristics of the unit accompanied by the exothermic reaction were examined from a fundamental point of view.
염화칼슘6수화물과 조핵제와의 반응에서 열역학 및 반응속도에 관한 연구
이수각,박영태 경일대학교 산업기술연구소 1991 産業技術硏究所 論文集 Vol.1 No.-
In this paper, the effects of nucleating ability of SrCl₂ 6H₂O in the CaCl₂ 6H₂O solution is experimentally investigated. The experiment was conducted both the Thermogravimetric Analysis(TGA) and the sample cell system respectively. As a result, it was found within the range of experimental conditions emploed in the present study that the concentration of nucleator, strontium, for the heat storage system of CaCl₂ 6H₂O increase as the nunber of melting-freezing process, and that the location of nucleator like top better than bottom.
Cellulose Acetate 막의 기체투과특성에 관한 연구
이수각,박영태,최호상,남석태 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
Gas permeation characteristics of cellulose acetate membranes, prepared by different methods as like solvent casting method and water casting method, were examined. In case of solvent casting membranes, permeation rate and the effect of Knudsen flow were increased with increasing the time of solvent evaporation. As increasing the polymer concentration, gas permeability of water casting membranes was decreased while selectivity was increased. The values of water casting membrane, such as permeability and selectivity, was in the range between asymmetrics' and symmetrics' those prepared by solvent casting. The gas permeation mechanism seems to obey the combination Poiseuille and Knudsen model and the solution diffusion model with the variation of polymer concentration and the time of solvent evaporation.