R1234ze(Z)蒸气压方程

Vapor pressure equation of R1234ze(Z)

为了对第4代新型制冷剂R1234ze(Z)的热物性有更多认识,文中在公开发表的文献中,搜集了关于R1234ze(Z)的饱和蒸气压实验数据。对每组数据精度进行分析后,筛选得到140组实验数据。经过非线性拟合,获得了R1234ze(Z)的4项Wagner型蒸气压专用方程。该方程适用温度区间为283—413 K,压力区间为12—2950 kPa。将拟合数据与该方程进行对比,其压力绝对偏差大部分在±2 kPa,相对偏差分布于±1%范围,平均绝对偏差为0.193%。对比文献数据与该方程,其压力相对偏差范围为-1%—2%,最大相对偏差为1.827%,平均绝对偏差为0.282%。因此,新方程对各组实验数据点都有很好的拟合度。根据此方程,计算得到R1234ze(Z)的标准沸点为284.751 K,偏心因子为0.325,可供物理性质的计算和工程实践的应用。

In order to better understand the thermophysical properties of the fourth generation refrigerant R1234ze(Z),the saturated vapor pressure experimental data of R1234ze(Z)in published literatures were collected.After analyzing the accuracy of every experimental data,140 groups of experiment data were screened out.A four term Wagner type vapor pressure special equation of R1234ze(Z)is obtained through nonlinear fitting.The temperature range of the equation is 283-413 K,and the pressure range is 12-2950 kPa.The absolute deviation of the fitted data to the equation is mostly±2 kPa,the relative deviation is within±1%,and the average absolute deviation is 0.193%.The relative deviation for all literature data to the equation is in the range of-1%to 2%,the maximum relative deviation is 1.827%and the average absolute deviation is 0.282%.Therefore,the new equation can fit each group of experiment data better.According to this equation,calculate the normal boiling point of R1234ze(Z)is 284.751 K,eccentricity factor is 0.325,which are used in calculating the physical properties and applying engineering.