HFC-32制冷剂饱和液体热力性能参数计算模型

Calculation Model of Thermodynamic Properties of Saturated Liquid for HFC-32 Refrigerant

制冷剂简单有效的热力性能参数计算模型对制冷循环的仿真是十分必要的。提出了HFC-32制冷剂饱和液体的蒸汽压和密度关联式计算模型;在HFC-32的GMA液体状态方程基础上,利用Helmholtz偏离函数和Maxwell关系式推导出了HFC-32饱和液体的焓、熵和比热容的计算模型;上述各模型均不存在迭代,保证了模型的计算精度和稳定性。将建立的各模型在饱和液体(275～335K,0.862～4.095MPa)范围内与REFPROP7计算值进行对比,结果表明,所有热力性能参数计算模型的相对平均误差不超过0.776%,最大误差小于4.464%,证明了所建立模型的可靠性。

Simple and effective calculation models to determine thermodynamic properties of refrigerant are very necessary for simulation of refrigeration system. Correlations of saturated vapor pressure and liquid density for HFC-32 refrigerant were presented. On basis of GMA state equation of liquid for HFC-32, Helmholtz bias function and Maxwell relationship of the thermal physical parameters, the calcu- lation models of enthalpy, entropy and specific heat capacity were deduced. The calculation models mentioned above with no iteration can achieve high precision and stability. Comparisons between calculation models and REFPROP7, covering saturation liquid line （275 335K,0. 862 -4. 095MPa） , have been made. The results show that, the average relative error and maximum relative error for all calcula- tion models are less than 0. 776% and 4. 464% , respectively.