[Bug] DP sensors have 0 mass flow that create lots of warnings

[pierre-eliep-met]

Describe the bug

Simply launch anymodel containing a DP_sensor, it will return warnings because each DP_sensor has two connections with 0 massflow...
This is the followup of old #253

Expected behavior

Should work without warning, but how can we take only pressure with the connectors ? Or just don't set mass flow rates to 0 ?

To be checked by issue author

• I checked that this issue is not a duplicate
• I added the appropriate labels to my issues
• I added the appropriate assignees to my issue
• I linked the related issues in the description of my issue

[casella]

@pepmts we need more details to figure out the answer. Is there any model in the library we can run to reproduce this issue?

BTW, among the checks you listed at the beginning of the ticket, may we suggest to add one more: I have given indications on how to reproduce the issue.

This is essential for whomever is in charge of fixing it to have a full understanding of what the problem is. 😃

[pierre-eliep-met]

Yes, simply go to MetroscopeModelingLibrary.Tests.Sensors.WaterSteam.DeltaPressureSensor.mo

Sorry, I should have added that 😇

[casella]

The model seems to run fine in OpenModelica.

In Dymola, I get this diagnostic message:

The variable DP_sensor.C_in.Q=0 is not in range [1e-05,1e+100].

which stems from the fact that you are redeclaring the Q variable to have type Units.PositiveMassFlowRate, that has this range, in the definition of the FluidInlet connector. Either you set min (or max for the other port) to exactly zero, or you define another type without this limitation for such components and then use it.

[pierre-eliep-met]

Great, I did not think of that, I thought that having a 0 mass flow was the problem, but it's okay now, thanks !

[AndreaBartolini]

Hi, it seems that this issue can be closed...