活度系数法预测R600a_LAB气液相平衡.doc

文档介绍：
活度系数法预测 R600a/LAB 气液相平衡#
韦俊,毕胜山,刘志刚,吴江涛**
(西安交通大学热流科学与工程教育部重点实验室,西安 710049;)
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摘要:本文选用五种活度系数模型计算了 R600a/LAB 润滑油的气液相平衡性质,并与状态
方程法预测结果相比较,结果表明:从压力的绝对误差来看,Wilson、Tsuboka-Katayama、
Heil-Prausnitz 模型结果优于状态方程法,NRTL 和基团贡献法计算结果与状态方程法相当,
而 UNIQUAC 模型平均绝对误差最大。应用基团贡献法直接计算 R600a/LAB 润滑油气液相
平衡的泡点压力,计算结果明显优于状态方程法。
关键词:气液相平衡;活度系数;R600a;润滑油
中图分类号:TK121
Vapor-liguid Equlibrium Prediction for R600a+LAB Oil
Based on the Activity Coefficient Method
WEI Jun, BI Shengshan, LIU Zhigang, WU Jiangtao
( Key Laboratory of Thermal Fluid Science and Engineering of MOE,Xi'an Jiaotong University,
Xi'an 710049;)
Abstract: In this paper five activity coefficient models were used to predict the Vapor-liguid
equlibrium characteristics of R600a+LAB. The results show that the prediction deviation is better
than the state equation method for the Wilson, Tsuboka-Katayama, Heil-Prausnitz model. And the
results of NRTL model and group contribution method are little difference from the state equation
method. But the average absolute deviation of UNIQUAC model was the largest. Finally, the
group contribution method was used to calculate the bubble point pressure of R600a+LAB, the
results showed that it is better than the state equation method and UNIQUAC prediction.
Key words: VLE, Activity coefficient, R600a, Lubricant oil
0 引言
在蒸气压缩制冷循环中,润滑油总是伴随着制冷剂一起流动,含润滑油制冷剂在蒸发器