四参数方程关联纯物质的蒸汽压

Four Parameter Equation Relating Vapor Pressure of Pure Material

准确的预测蒸汽压的数值是非常重要的,它是基础热力学数据,在热力工程计算中广泛使用。三参数的Antoine蒸汽压方程,得到普遍的应用,但该方程在使用的温度范围内有限,而且精度也不高。在此引入四参数的蒸汽压方程,并用24种纯物质对640多个蒸汽压数据点进行关联,总的平均相对偏差仅为0.348%。结果表明该方程比Antoine蒸汽压方程更精确。

It is very important to predict the value of vapor pressure accurately.It is the basic thermodynamic data and widely used in thermal engineering calculation.The three parameter Antoine vapor pressure equation has been widely used,but the equation is limited in the use of temperature range and the accuracy is not high.The four parameter steam pressure equation was introduced and more than 640 vapor pressure data points with 24 pure materials were correlated.The total average relative deviation was only 0.348%.The results showed that the equation was more accurate than the Antoine vapor pressure equation.