HFC134a/HCFC141b混合气体水合物相平衡特性

1引言致冷剂气体水合物具有适合空调蓄冷的理想性质，其形成结晶的温度在8～12℃，在结晶形成“暖冰”时，释放较大的反应热（330～380kJ／kg），并且具有较好的传热性能1~2]。但早期研究的主要是R11和R12的水合物，其致冷剂是典型的大气臭氧层破坏物质，现已受到了严格的限制。研究和开发新型的CFC替代物气体水合物已成为当前的重点3]。近年来，中国科学院广州能源研究所在国家自然科学基金和广东省科学基金的支持下，展开了对新型致冷剂气体水合物相变蓄冷材料的研究。文献4]首次报告了对CFC替代物HFC152a／HCFC141b混合气体水…

PHASE-EQUILIBRIUM PROPERLY OF HFC134a/HCFC141b MIXED GAS HYDRATE

In this study, the phase-equilibrium property of the mixed gas hydrate formed by an-other pair of CFC alternatives HFC152a/HCFC141b was measured under a constant volume condition. The phase diagrams of mixed gas hydrates and their characteristics were fur-ther studied, and the phase-equilibrium property of mixed gas hydrates comparing to that of simple gas hydrates was depicted and discussed. The experimental result reveals that HFC134a/HCFC141b mixed gas hydrate has a non-azeotropic melting property, which is different from that of HFC152a/HCFC141b4]. The melt and freeze points are quite close because the decomposition temperatures of HFC134a and HCFC141b simple gas hydrates have small difference.