立方型状态方程在R134a热力性质计算中的研究

Research on Cubic Equations of State in the Calculation of Thermodynamic Properties of R134a

比较了SRK方程,PR方程,童景山方程和苏志军方程4个通用立方型状态方程用于R134a饱和气、液的体积计算准确度。计算表明,在-50~90℃的范围内,童景山方程的计算偏差最小,饱和气与饱和液体积的计算值与文献值的平均偏差为1.63%和4.12%;PR方程的计算平均偏差为1.90%和4.76%;SRK方程平均偏差最大,为3.35%和18.64%;苏志军方程的计算偏差与PR方程基本相同,为2.00%和5.21%。结果表明,对于R134a来说,童景山方程的计算结果更加精确,更适合用于R134a热力性质的工程计算。

The accuracy of saturated steam and liquid volume calculations for R134 a were compared,which was used by four general cubic equations of state： the SRK equation,the PR equation,the Tong Jingshan equation and the Su Zhijun equation. Calculations showed that in the range of- 50 ~ 90 ℃,the Tong Jingshan equation had the least calculation error,average deviation of saturated gas volume and liquid volume calculation values and literature values were1. 63% and 4. 12%,average deviation of the PR equation＇s calculation values and literature values were 1. 90% and4. 76%,average deviation of the SRK equation had the largest error,it＇s calculation values and literature values were3. 35% and 18. 64%,average deviation of the Su Zhijun equation was basically the same as the PR equation,it＇s calculation values and literature values were 2. 00% and 5. 21%. The results showed that for R134 a,the calculation of Tong Jingshan equation was more accurate, and it was more suitable for engineering calculations for R134a＇s Thermodynamic properties.