PROII模型选择问题？ 楼主问的是计算方法（在aspen里边叫计算路径）的问题。比如你打开热力学方法选择页，点击modify...按钮，就会出现你所选择的热力学方法具体物系各个性质计算用到的方法。比如说srk热力学方法，在计算液体密度时默认为api方法，气体密度为srk方法。而这些方法在计算特定性质时所用的方程和原理，可以参看proii的热力学手册。 如api密度，在proii帮助里可以看到介绍如下： the api method (api) may be used to predict liquid densities at flowing conditions. a standard liquid density is computed at 60 degrees f, using the weight average of the component densities. the reduced temperature and pressure of the mixture at 60 degrees f and 14.696 psia are computed with kay's rule and used to determine a density factor, c, from figure 6a2.21 in the api technical data book. a second factor is determined at the flowing temperature and pressure for the mixture and the flowing density is computed from the equation below: 方程为图片形式，看不到 more information on this method is presented in section 1.2.3 of the pro/ii reference manual.查看更多
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