一个修正的对比态方程推算制冷剂蒸气压

Prediction of Vapor Pressure of Refrigerants Based on a Modified Corresponding State Equation

为了更好地应用Teja方程预测制冷工质在低温区域和临界温度附近的饱和蒸气压,基于对比态原理提出了一种新特性因子,用于替代Teja方程中的偏心因子,修正后的方程及原方程与实验数据比较后表明:在中温区域(对比温度在0.6～0 8之内)两者的计算精度相当;而在低温区域(对比温度小于0.6)和临界温度附近(对比温度大于0.8)修正后方程的计算精度有着明显的提高。

In order to accurately predict the vapor pressure of refrigerants in the lower temperature region and near the critical temperature region, based on the corresponding state principle, a new characteristic factor which is instead of acentric factor in the Teja equation is proposed. Compared the modified equation and the previous equation with the experimental data, the prediction accuracy for the both of the equations is very well in the middle temperature region （the range of the reduced temperature is 0.6-0.8.）, but the prediction accuracy of the modified equation is obviously improved in the lower temperature region （the reduced temperature is less than 0.6） and near the critical temperature region （the reduced temperature is greater than 0.8）.