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구형 PCM입자의 제조 및 캡슐화에 관한 연구
A Study on the Preparation of Spherical PCM Particle and Its Encapsulation
HWAHAK KONGHAK, April 1999, 37(2), 151-157(7), NONE
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Abstract
잠열 저장물질로서 sodium acetate trihydrate를 사용하여 구형의 PCM 입자를 제조한 후 PMMA와 wax를 이용하여 캡슐화하였다. 상분리 현상 및 과냉각 현상을 최소화하는 점증제(gelatin)와 조핵제(sodium pyrophosphate decahydrate)의 최적 조성은 점증제 2wt%와 조핵제 21wt%로 나타났다. 이 조성의 용융 PCM을 이용하여 1.3-1.8 ml/min의 방출속도에서 지름 3-3.5 nun의 구형 PCM 입자를 연속적으로 제조할 수 있었다. PCM의 결정수 누출방지 및 기계적 강도를 높이기위하여 제조한 PCM 입자를 1차로 코팅한 PMMA의 평균두께는 0.03 mm,2차로 코팅한 wax의 평균두께는 0.25 m, 그리고 마지막으로 코팅한 PMMA의 평균두께는 0.4mm였다. 전열 매체로서 dodecane을 사용한 용융-동결 실험 및 DSC를 이용한 코팅후 PCM 입자의 용융-동결 cycle실험을 수행하였다.
Spherical shape of phase change materials(PCM) were prepared by using sodium acetate trihydrate as a latent heat storage medium and then encapsulated with PMMA and wax. Gelatin was used as an effective thickener to prevent undesirable phase separation and sodium pyrophosphate decahydrate was used as nucleator to decrease the degree of super-cooling in the thickened PCM. The optimal composition of PCM was 2wt% thickener and 2wt% nucleator. Spherical shape of PCM particles of 3-3.5 mm in diameter were continuously manufactured varing the effluent velocity of molten PCM from 1.3 to 1.8 ml/min. Tertiary coatings of PMMA-wax-PMMA onto the PCM particles obtained were performed to prevent the leakage of crystalline water and to improve the mechanical strength. Thickness of each layers were 0.03 m, 0.25 mm, and 0.4 mm. Freezing-thaw cycle test of the coated PCM particle was done using dodecane as heat transfer medium by the experimental apparatus and DSC.
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