Heat Regeneration in Dymola/Modelica

Question

I want to build a system which consists of solar thermal collectors and ground source heat exchanger. I have a whole season weather data, which is connected with solar thermal collectors. I want to see how much heat will be released during the whole season from solar collectors to the ground by ground source heat exchanger respectively borehole, and the increased ground temperaure by heat release.

Although I have the same number of unknowns and equations, the singularity error comes up.

Is there any missing process element?

Thanks Orhun enter image description here

Answer 1

The thermo-hydraulic part of your model needs a "ground" component to provide a reference pressure and enthalpy, since the heat exchanger components only describe changes in pressure/enthalpy.

You could use a Modelica.Fluid.Sources or Buildings.Fluid.Sources component for that.