Why are the results of physical property simulation using HYSYS incorrect?
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Recently, HYSYS was used for solution simulation, and NRTL was selected for the physical property equation. It was found that Cp/Cv was greater than 1, because for liquids, Cp and Cv should be basically equal. Then ASPEN PLUS was used to simulate, and the Cp/Cv value was 1. There is a big difference between the two. Is PLUS more accurate? I don’t know why. Have you compared it?
Strictly speaking, the value on hysys is closer to the real situation. .
Hello, thanks for the reply. But for liquids, Cp and Cv are basically equal. This result is 1.25 times. Why is it closer to the real situation?
The heat capacity at constant pressure requires external work, so it is larger than the heat capacity at constant volume. As for the large ratio, it is similar to that of gas. You can understand the gas one, and you should also be able to understand the liquid one.