HFO类工质立方型容积平移状态方程

Equation of state based on cubic volume translation for HFO working fluids

为了更加准确地描述制冷工质纯组分的热力学行为,文中通过拟合HFO类制冷工质的热物性实验数据,回归得到立方型容积平移状态方程的2个可调参数,并将方程的2个可调参数普遍化为关于临界压缩因子的函数。对计算结果进行了分析讨论,分析立方型容积平移状态方程纯流体饱和液相密度和高压液体密度的计算精度。研究结果表明:与原始的PR状态方程和SRK状态方程相比,立方型容积平移状态方程对饱和液相密度和单相液体密度改进显著。以R1234ze(E)为例,验证了文中所建立的立方型容积平移状态方程。VTPR状态方程计算饱和液相密度的平均绝对相对偏差为1.42%,计算高压液相密度的平均绝对相对偏差为0.82%;VTSRK状态方程计算饱和液相密度的平均绝对相对偏差分别为3.58%,计算高压液相密度的平均相对偏差为2.00%。

In order to describe the thermodynamic behavior of the pure components of the refrigerant more accurately,the experimental data of the thermophysical properties of the HFO refrigerant was fitted,and the two parameters of the equation of state were obtained based on cubic volume translation regression through regression methods.The two parameters were generalized as functions of the critical compression factor.The calculation results were analyzed and discussed,and the calculation accuracy of the pure fluid saturated liquid density and the high-pressure liquid density obtained from the equation of state based on cubic volume translation were analyzed.Compared with the original PR equation and SRK equation,the research results show that equation of state based on the cubic volume translation makes a significant improvement on the accuracy of the calculation of the density of saturated liquid phase and the density of single-phase liquid.Taking R1234ze(E)as an example,the effectiveness of the equation of state based on cubic volume translation was verified.The average of the absolute relative deviations of the saturated liquid phase density and the high-pressure liquid phase density calculated by VTPR equation of state are 1.42%and 0.82%,respectively.The average of the absolute relative deviations of the saturated liquid phase density and the high-pressure liquid phase density calculated by VTSRK equation of state are 3.58%and 2.00%,respectively.