functioninternalResistancesTwoUTube

Thermal resistances for double U-tube, according to Bauer et al (2011)

Extends from IBPSA.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.Functions.partialInternalResistances.

Information

This model computes the different thermal resistances present in a double U-tube borehole using the method of Bauer et al. (2011). It also computes the fluid-to-ground thermal resistance Rb and the grout-to-grout thermal 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.

Outputs

TypeNameDefaultDescription
Modelica.SIunits.ThermalResistanceRgbThermal resistance between a grout capacity and the borehole wall, as defined by Bauer et al (2010)
Modelica.SIunits.ThermalResistanceRgg1Thermal resistance between two neightbouring grout capacities, as defined by Bauer et al (2010)
Modelica.SIunits.ThermalResistanceRgg2Thermal resistance between two grout capacities opposite to each other, as defined by Bauer et al (2010)
Modelica.SIunits.ThermalResistanceRCondGroThermal resistance between a pipe wall and the grout capacity, as defined by Bauer et al (2010)

Revisions

  • July 18, 2018 by Massimo Cimmino:
    Implemented multipole method.
  • February 14, 2014 by Michael Wetter:
    Added an assert statement to test for non-physical values.
  • February 12, 2014, by Damien Picard:
    Remove the flow dependency of the resistances, as this function calculates the conduction resistances only.
  • January 24, 2014, by Michael Wetter:
    Revised implementation.
  • January 23, 2014, by Damien Picard:
    First implementation.