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Assert triggered in Borefields example after #4179 #4190

@maltelenz

Description

@maltelenz

Describe the bug
After the merge of #4179 we get an assert when simulating Buildings.Fluid.Geothermal.Borefields.Examples.Borefields in Wolfram System Modeler.

Here is the assert we are seeing:

[normal ;GENERAL ;7200.00000000000000000] Failed to evaluate output variables at accepted step.
[error ;ASSERT ;7200.00000000000000000] [ode:1564] In component borFie2UTubSer.borHol.intHex[1].vol4.dynBal.medium: In Borefields.borFie2UTubSer.borHol.intHex.vol4.dynBal.medium: Temperature T = 272.082 K exceeded its minimum allowed value of -1 degC (272.15 Kelvin) as required from medium model "Buildings.Media.Water".

To Reproduce
Simulate Buildings.Fluid.Geothermal.Borefields.Examples.Borefields in Wolfram System Modeler.

Expected behavior
The model simulates to completion, as it did before #4179.

Version

  • Modelica Buildings Library: 97f14e68
  • Wolfram System Modeler (development version)
  • Operating system: All platforms

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