COCO Flowsheet UNIT Parameter Selection

[uwe81543]

Hi,

a small problem. The selection of parameters from the embeded flowsheet to be exposed to the external enviorement is not peristent.
After saving and reloading (or solving in seperate thread) the selection is gone.

Regards

Uwe

[jasper]

Thank you for reporting that. The parameters were actually saved. And restored properly. But not added to the parameter collection. Fixed. The fix is available via CUP.

[uwe81543]

Thank you for the ultrafast bugfix

Regards

Uwe

[Ronny]

Hello,

I'm having a small issue exposing embeded controler set point parameter.
At the attached example it has been possible to expose most of the embeded parameters to the external environment, except for the controler set ponit.
Either the set point paramenter is gone from the selection after running the simulation, or COFE crashes if one try to edit the COCO flowsheet UNIT just after selecting this parameter to be exposed.

Kind Regards,
Ronny

[jasper]

Thank you for reporting these problems (there were two problems, one leading to the crash you observed and the other leading to parameters being removed upon persistence, and consequently upon running in a background thread). The issues are fixed in COFE 2.6.0.10, available via CUP.

[Ronny]

Hello Jasper!

Thank you very much for the prompt reply!
Working perfectly on version 2.6.0.10!

[Ronny]

Hi!

Small issues still on the Flowsheet Unit Operation attached:
a) Embeded controler setpoint, when exposed to external environment, brings the parameter name ("Setpoint") instead of the exported name ("SuperHeat Degree")
b) External Input streams, that have embeded flow constraint, does not have the resulting constrained flow result back propagated to it's external inlet flow (attached example: water stream)

Best Regards,
Ronny

[jasper]

a) Fixed. Fix is available via CUP.

b) This cannot be fixed in a sense that you can use it. The result would be that the embedded unit operation would set a flow rate on its feed stream, which is not something that CAPE-OPEN allows for. This is why the flow contraint is an internal unit operation and not a CAPE-OPEN unit operation. Of course the fact that it did not complain about this was an oversight. It does now. To obtain the result that you want to obtain you can either control the feed stream at the top level (in the outer flow sheet), or

- add an additional purge stream to the embedded flowsheet
- put a surplus flow on the feed stream of which you are not controlling the flow rate
- put whatever remains (the surplus minus the required flow rate) back on the purge stream
- deal with the purge stream in the outer flowsheet

[Ronny]

Thank you very much for the support.