.BuildSysPro.IBPSA.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.Functions.internalResistancesOneUTube

Information

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

Interface

function internalResistancesOneUTube
  extends IBPSA.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.Functions.partialInternalResistances;
  output Modelica.Units.SI.ThermalResistance Rgb "Thermal resistance between grout zone and borehole wall";
  output Modelica.Units.SI.ThermalResistance Rgg "Thermal resistance between the two grout zones";
  output Modelica.Units.SI.ThermalResistance RCondGro "Thermal resistance between: pipe wall to capacity in grout";
end internalResistancesOneUTube;

Revisions

• February 7, 2022, by Michael Wetter:
  Changed function to be pure.
  This is for IBPSA, #1582.
• December 11, 2021, by Michael Wetter:
  Added impure declaration for MSL 4.0.0.
• 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.