ASPEN binary gas phase data regression
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In ASPEN’s binary gas phase data regression, under the parameter settings, there are options for Use: regress, fix, and exclude. The value set to fix remains unchanged during the regression process; how is this value determined?
Regression is generally chosen. As for the constant value, it is likely the alpha in the NRTL equation; this value usually falls within a fixed range, with 0.2, 0.3, or 0.6 being the most common values. Generally, as long as the regression equation can fit the data points well, these parameters are considered reasonable