| Title |
Improving the Precision for the T-history Method for Latent Heat Measurements of Low Melting Temperature PCMs |
| Keywords |
PCM ; 상변화물질 ; Latent heat ; 잠열 ; T-history method ; 온도이력법 ; Heat of fusion ; 융해열 ; Precision ; 정밀도 |
| Abstract |
When test tubes for PCM with melting point lower than a room temperature are installed vertically as the T-history method proposes, there exists a temperature distribution in the longitudinal direction by natural convection, which lowers the precision of measured heat-of-fusion. The purpose of the present work is to improve the precision by arranging the test tubes horizontally, while maintaining the simplicity and convenience. Assuming that the amount of heat transfer is very small through the vapor space formed in the upper part of the tubes by volumetric change, the obtained value by the T-history method using the latent heat period bounded by two inflection points is in good agreement with that of the literature. Also, the scattering of measured values by the proposed method decreases markedly compared to that of vertical positioning. |