Custom model unit operation
Simulate chemical processes using advanced thermodynamic models
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Dear Daniel,
I downloaded the Plate Heat Exchanger custom model from FOSSEE site:
https://dwsim.fossee.in/custom-model/completed-custom-models
I modified the model with 4 valves to use later in dynamic simulation.
Unfortunately, whenever I try to add valves and run the simulation with different input temperatures I get wrong results. It means, with 300 and 340 K inlet stream temperatures the temperatures of the outlet streams are ~370 K.
I tried to use other thermodynamic method (UNIQUAC, NRTL) but I got the same (wrong) results.
The model is perfect, without valves I could use it. I set other valves models (liquid, general service) but no change.
What could be the problem?
I attached the mentioned simulation file (the modified).
Thank you in advance for your help!
Kind regards,
Patrik Molnár
Hi Patrik, unfortunately I can't give you support on the model since I wasn't the one who developed it. Can you contact its author?
Hi Patrik,
it seems that there were some script's issues in assigning the outlet streams.
See if the attached modified script suits you (I made only few temperatures changes checks).
Hope this helps.
Luca
Hi Luca,
Thank you for your help and answer!
Yeah, it is a(nother) great solution.
I tried again with UNIQUAC property package and I modified it a little bit (settings->thermodynamics->configure->equilibrium calculation settings). And it already works.
Maybe we made the same thing, change......
Thank you again for your help, I saved the model and will use.
Kind regards,
Patrik Molnár