modelInternalHEXOneUTube

Internal heat exchanger of a borehole for a single U-tube configuration

Extends from IBPSA.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.PartialInternalHEX, IBPSA.Fluid.Interfaces.FourPortHeatMassExchanger.

Information

Model for the heat transfer between the fluid and within the borehole filling for a single borehole segment. This model computes the dynamic response of the fluid in the tubes, the heat transfer between the fluid and the borehole filling, and the heat storage within the fluid and the borehole filling.

This model computes the different thermal resistances present in a single-U-tube borehole using the method of Bauer et al. (2011) and computing explicitely the fluid-to-ground thermal resistance Rb and the grout-to-grout resistance Ra as defined by Claesson and Hellstrom (2011) using the multipole method.

References

J. Claesson and G. Hellstrom. Multipole method to calculate borehole thermal resistances in a borehole heat exchanger. HVAC&R Research, 17(6): 895-911, 2011.

D. Bauer, W. Heidemann, H. Müller-Steinhagen, and H.-J. G. Diersch. Thermal resistance and capacity models for borehole heat exchangers . International Journal Of Energy Research, 35:312-320, 2011.

Components

TypeNameDefaultDescription
Modelica.Blocks.Sources.RealExpressionRVol1Convective and thermal resistance at fluid 1
Modelica.Blocks.Sources.RealExpressionRVol2Convective and thermal resistance at fluid 2
IBPSA.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.InternalResistancesOneUTubeintResUTubInternal resistances for a single U-tube configuration
Modelica.Thermal.HeatTransfer.Components.ConvectiveResistorRConv2Pipe convective resistance
Modelica.Thermal.HeatTransfer.Components.ConvectiveResistorRConv1Pipe convective resistance

Revisions

  • July 10, 2018, by Alex Laferrière:
    Updated documentation following major changes to the IBPSA.Fluid.HeatExchangers.Ground package. Additionally, implemented a partial InternalHex model.
  • June 18, 2014, by Michael Wetter:
    Added initialization for temperatures and derivatives of capFil1 and capFil2 to avoid a warning during translation.
  • February 14, 2014, by Michael Wetter:
    Removed unused parameters B0 and B1.
  • January 24, 2014, by Michael Wetter:
    Revised implementation, added comments, replaced HeatTransfer.Windows.BaseClasses.ThermalConductor with resistance models from the Modelica Standard Library.
  • January 23, 2014, by Damien Picard:
    First implementation.