RESEARCH ON STORAGE OF COLD USING CLATHRATE HYDRATE COMPOUND

本研究的目的是提高目前冰蓄冷系统的能效。这个想法是使用笼状水合物，在高于0摄氏度的A温度下将其相从液体转变为固体。本研究选用的物质为四正丁基溴化铵(以下简称TBAB)。当A质量分数为0~40%的四丁基三甲基溴化铵水溶液冷却时，在0~12℃的A温度下形成笼状水合物晶体。用差示扫描量热仪测定了相变温度和相变潜热与质量浓度的关系。同时，测定了水合物形成后的固液相分数和折射率。此外，通过高倍显微镜观察了水合物晶体的形貌，发现其典型的形状为圆柱形。

THE OBJECTIVE OF THIS RESEARCH IS TO IMPROVE THE ENERGY EFFICIENCY OF THE COLD-STORAGE ATTAINED CURRENTLY BY ICE-STORAGE SYSTEMS. THE IDEA IS TO USE A CLATHRATE HYDRATE COMPOUND THAT CHANGES ITS PHASE FROM LIQUID TO SOLID AT A TEMPERATURE HIGHER THAN 0 DEGREE. THE SUBSTANCE SELECTED IN THIS RESEARCH IS TETRA-N-BUTYLAMMONIUM BROMIDE (HEREAFTER "TBAB" ). WHEN THE AQUEOUS SOLUTION OF TBAB WITH A MASS CONCENTRATION BETWEEN 0〜40 % IS COOLED, CRYSTALS OF CLATHRATE HYDRATE ARE FORMED AT A TEMPERATURE BETWEEN 0〜12 DEGREE. THE DEPENDENCE OF THE PHASE-CHANGE TEMPERATURE AND THE LATENT HEAT OF PHASE CHANGE UPON THE MASS CONCENTRATION WERE OBTAINE USING A DIFFERENTIAL SCANNING CALORIMETER. AT THE SAME TIME, THE FRACTIONS OF SOLID AND LIQUID PHASES AFTER THE HYDRATE FORMATION AND THE REFRACTIVE INDICES WERE MEASURED. IN ADDITION, MORPHOLOGY OF THE HYDRATE CRYSTALS WERE OBSERVED THROUGH A HIGH-MAGNIFICATION MICROSCOPE, REVEALING THAT THE TYPICAL SHAPE OF THE CRYSTALS IS CYLINDRICAL.