环保制冷剂R1234ze(E)蒸气压方程

Vapor pressure equation of environmental friendly refrigerant R1234ze(E)

为了更完善地认识第四代新型制冷剂R1234ze(E)的热物理性质,并将其应用于工程实践,文中对相关文献中的有关R1234ze(E)的饱和蒸气压实验数据进行了定量分析。通过定量分析每组数据的精度,筛选得到192组数据点组成的综合数据,经过非线性拟合,获得了R1234ze(E)的4项Wagner型蒸气压专用方程。该方程适用温度区间为223—380 K。对比拟合数据与该方程,其压力绝对偏差大部分在±2 kPa,相对偏差分布于±0.3%,平均绝对偏差为0.041%。将文献数据与该方程进行对比,其压力相对偏差大部分分布在-2.5%—0.5%,绝对偏差范围为-2.5—2 kPa。因此,新方程对各组实验数据点都有很好的拟合度,可供热物理性质的计算及工程实践应用,具有良好的工程实际应用价值。

In order to better understand the thermophysical properties of the fourth-generation new refrigerant R1234ze(E)and apply it to engineering,experimental data on the saturated vapor pressure of R1234ze(E)in the published literatures were analyzed.Through qualitative analysis of the accuracy of each set of data,192 sets of comprehensive data composed of data points were screened,and four Wagner-type vapor pressure special equations of R1234ze(E)were obtained based on nonlinear fitting method.The applicable temperature range of this equation is between 223 K and 380 K.Comparing the fitted data with this equation,the absolute deviation of the pressure is mostly±2 kPa,the relative deviation is distributed in the range of±0.3%,and the average absolute deviation is 0.041%.Comparing the literature data with this equation,the relative deviation of the pressure is mostly distributed between-2.5-0.5%,and the absolute deviation range is between-2.5-2 kPa.Therefore,the established four Wagner-type vapor pressure special equations fit each set of experimental data points well,which can be used for the calculation of thermophysical properties in engineering,and have great potentials for the wide application in engineering.