一、导言取代目前应用于空调和热泵中的氟氯烷烃类制冷剂的工作,作为建筑设备研究项目的一部分,正在奥克里季国家实验室进行研究之中。非共沸混合工质作为一类替代物,显示出一种独特的性质,即压力一定时其饱和温度是干度的函数。也就是说,相变过程并非等温过程。非共沸工质相变时的温度变化称为滑动温度效应。这个非等温相变行为,能够改善热交换器在效率以及热力循环效率。然而,有的学者如Jung等人已经测得了光滑管中二元非共沸混合 I. INTRODUCTION The replacement of the HCFC refrigerants currently used in air conditioning and heat pumps, as part of a research project on construction equipment, is under study at Oak Ridge National Laboratory. As a kind of alternative, non-azeotropic working fluids show a unique property that the saturation temperature is a function of dryness at a constant pressure. In other words, the phase change process is not an isothermal process. Non-azeotropic refrigerant phase transition temperature change is called the sliding temperature effect. This non-isothermal phase change behavior can improve heat exchanger efficiency and thermodynamic cycle efficiency. However, some scholars such as Jung et al. Have measured binary non-azeotropic mixtures in smooth tubes