I have questions regarding the differences in calculation results after selecting material properties
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My materials are HF gas with a fraction of 0.35 at 40°C, C2H2 gas with a fraction of 0.48 at 25°C, and C2H4F2 gas with a fraction of 0.17 at 40°C. These gases are mixed together using a mixer; no external heat source is used, and the mixing occurs naturally. When I select the properties corresponding to an ideal state, the temperature of the mixed gas is around 31 degrees Celsius. However, when I choose the option related to fluorine compounds, the calculated temperature is 13.3 degrees Celsius, which is lower. Why is this? Question! ! ! !
Aspen is merely a tool for chemical process simulation; the choice of thermodynamic equations must be based on the actual conditions of the materials involved. It is advisable to make adjustments, as simply selecting a thermodynamic equation is not sufficient to solve the problems.
This result is correct; different material systems require different algorithms as well as different databases. It would be terrifying if the same result were obtained using algorithms that differ significantly from one another. The choice of physical property methods depends on one’s own judgment; software can only provide guidance, and the methods recommended may not be accurate.
It is entirely possible in reality; it’s easy to understand when considering the mixing enthalpy.
I am still at an introductory level with ASPEN; I can’t really say I understand it well. I was wondering, in a situation like this, what kind of physical property method should I choose? ? How should I go about it?