【摘要】 高温热泵适宜采用高温工质。HFC245fa被普遍认为是替代CFC11和HCFC123的HFCs类新型高温工质。本文以试验数据为基础,采用Soave-Redlich-Kwong方程,辩识了HFC245fa的状态方程;采用Wagner模型拟合了HFC245fa的饱和蒸汽压力模型;基于基团原理,建立了HFC245fa的气体定压比热容模型;由Clausius-Clapegron方程得到了HFC245fa的汽化潜热模型;利用多项式模型,拟合了HFC245fa的粘度?导热系数等迁移性质模型;最后,根据上述模型,绘制其lgp-h图。结果表明,上述模型和图表的精度能够满足HFC245fa在设备研发和制造中的实际应用。更多还原

【Abstract】 High temperature work fluids are greatly suitable for the high temperature heat pump,and HFC245fa has been widely considered as a new high temperature work fluid to substitute CFC11 and HCFC123.Based on the experimental results of HFC245fa,thermodynamic properties models and transport properties models of HFC245fa have been regressed.Namely,the state equation and saturation vapor pressure equation of HFC245fa have been regressed respectively on the basis of Soave-Redlich-Kwong model and Wagner model.The vapor isotonic ratio specific heat model of HFC245fa has been created by the group theory.The evaporation latent heat model of HFC245fa has been finished by Clausius-Clapegron equation.Coefficient of viscosity,coefficient of heat transfer and other transport properties equations of HFC245fa have been built by various polynomial models.Finally,the lgp-h diagram of HFC245fa has been drawn out according to the built thermodynamic properties models.The error analyzed results of the thermodynamic properties models and transport properties models of HFC245fa show that all the models can meet the calculation precision demands of its applications in the development of the heat pump.更多还原