Issue Cooler/Heater with "Outlet Vapor Molar Fraction" as claculation type about dwsim

[DanWBR]

Outlet Vapor Fraction calculation mode triggers a saturation point flash calculation (pressure/vapor fraction), which is much slower than the more common pressure/temperature or pressure/enthalpy flashes.

[kookma]

Outlet Vapor Fraction calculation mode triggers a saturation point flash calculation (pressure/vapor fraction), which is much slower than the more common pressure/temperature or pressure/enthalpy flashes.

Is there any way to improve this? In Hysys this is very fast but it is not clear what methodology/numerical solver they use! Do you think there is any ground to work on this part? Please advise.

[DanWBR]

What I did in 4702a89 was to provide a better initial estimate for the P-VF flash in the heater/cooler. I was using the inlet temperature as the initial estimate, which was very far from the solution in your case, and for some reason the solver became stuck in a hole and did not converge. Now, with the better estimate, it converges quickly.

[kookma]

@DanWBR many thanks for all your efforts.