P-Vf flash failure

[EAST101NOVA]

Dear DWSim team,

Firstly, thank you for all your efforts with this project!

I was translating some of my old HYSIM/HYSYS training material into DWSim and ran into a problem with the dew point calculation (Spec P-Vf, calc T). I set the attached sim to demonstrate the issue.

DWSim Version 8.8.3

Describe the bug
The P-Vf flash doesn't calculate the right fluid temperature.

To Reproduce

PLEASE ATTACH THE ZIPPED FLOWSHEET FILE and/or inform the steps to reproduce the behavior:

Stream 12 is the vapor product stream exiting 2 phase separator V-2. It is in equilibrium with stream 13. Hence, stream 12 is a saturated vapor. It's at -10C and around 40 barg.

I copied the compositions from stream 12 to Stream 12-P-Vf-Flash and performed a P-Vf flash, i.e., P around 40 barg and Vf = 1. It should return a T of around -10C. Instead it returns a temperature of around -58 C.
DPCU-03.zip

Thanks,

Rafil ([email protected])

[DanWBR]

@EAST101NOVA thanks for the report, I'm looking into it.

[DanWBR]

@EAST101NOVA if you are running DWSIM on Windows, please re-download the v8.8.3 installer as it was updated with the fix for this issue.

[DanWBR]

320d028

[EAST101NOVA]

Thanks Daniel, did that, and it seems to work fine now.