HYSYS
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Why can gases in HYSYS be compressed into a liquid state above their critical temperature? For example, methane has a critical temperature of -82.6°C; in HYSYS, at a temperature of -20°C and a pressure of 22 Mpa, the gas phase fraction is shown as 0, meaning it is in a liquid state. Logically, above the critical temperature, shouldn’t it be entirely in a gaseous state regardless of the pressure?
What is shown here is all in gaseous form.
In the supercritical state, neither 0 nor 1 makes any sense.
The teacher’s understanding is the right one; the pressure has been overlooked, thank you.
Why do you say that? Could you explain it?
In HYSYS, the gas-liquid phase is determined based on density; therefore, in a supercritical state where the density is high, it is considered that the gas fraction is 0
Thank you, though I still don’t understand it