.Buildings.Fluid.Geothermal.ZonedBorefields.Validation.FEFLOW

Information

This package contains validation models that compare the results of the Modelica model with the ones from a finite element model that was simulated with the FEFLOW software.

In all models of this package, the temperatures TOut are the leaving water temperatures from FEFLOW, computed with FEFLOW's analytical solution for the borehole heat transfer. Comparing TOut with the temperatures TBorFieOut shows good agreement except at the initial transient at the start of the simulation when the mass flow rate changes from zero to the design flow rate. The leaving water temperatures at this initial transient show similar discrepancies as the comparison of FEFLOW's analytical and numerical solutions that is presented in the FEFLOW white paper (DHI-WASY 2010). In the FEFLOW white paper, it is explained that the reason for this difference is due to the FEFLOW's analytical solution not being valid for such short-time dynamics. Therefore, the validation of the Modelica implementation is satisfactory.

References

DHI-WASY Software FEFLOW. Finite Element Subsurface Flow & Transport Simulation System. White Paper Vol. V. DHI-WASY GmbH. Berlin 2010.

Contents

Name	Description
InletTemperaturePulse	Comparative model validation with FEFLOW for a response to a pulse in inlet temperature
MassFlowRatePulse100	Comparative model validation with FEFLOW for a pulse response
MassFlowRatePulse50	Comparative model validation with FEFLOW for a response to a pulse in inlet mass flow rate
MassFlowRateStep100	Comparative model validation with FEFLOW for a step response