modelInternalResistancesTwoUTube
Validation of the thermal resistances using the method of Bauer et al. (2011) for a double U-tube borehole
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This example validates the implementation of AixLib.Fluid.Geothermal.Borefields.BaseClasses.Boreholes.BaseClasses.Functions.internalResistancesTwoUTube for the evaluation of the internal thermal resistances of a double U-tube borehole.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | Rb | 0.0 | Borehole thermal resistance (Not used) |
| Modelica.Units.SI.Height | hSeg | 1.0 | Height of the element |
| Modelica.Units.SI.Radius | rBor | 0.07 | Radius of the borehole |
| Modelica.Units.SI.Radius | rTub | 0.02 | Radius of the tube |
| Modelica.Units.SI.Length | eTub | 0.002 | Thickness of the tubes |
| Modelica.Units.SI.Length | sha | 0.025 | Shank spacing, defined as the distance between the center of a pipe and the center of the borehole |
| Modelica.Units.SI.ThermalConductivity | kFil | 0.5 | Thermal conductivity of the grout |
| Modelica.Units.SI.ThermalConductivity | kSoi | 2.5 | Thermal conductivity of the soi |
| Modelica.Units.SI.ThermalConductivity | kTub | 0.4 | Thermal conductivity of the tube |
| Modelica.Units.SI.ThermalConductivity | kMed | 0.6 | Thermal conductivity of the fluid |
| Modelica.Units.SI.DynamicViscosity | muMed | 1.0e-3 | Dynamic viscosity of the fluid |
| Modelica.Units.SI.SpecificHeatCapacity | cpMed | 4180.0 | Specific heat capacity of the fluid |
| Modelica.Units.SI.MassFlowRate | m_flow_nominal | 0.25 | Nominal mass flow rate |
| Real | x | Capacity location | |
| Modelica.Units.SI.ThermalResistance | Rgb | Thermal resistance between grout zone and borehole wall | |
| Modelica.Units.SI.ThermalResistance | Rgg1 | Thermal resistance between the two adjacent grout zones | |
| Modelica.Units.SI.ThermalResistance | Rgg2 | Thermal resistance between the two opposite grout zones | |
| Modelica.Units.SI.ThermalResistance | RCondGro | Thermal resistance between: pipe wall to capacity in grout |
Revisions
-
November 22, 2023, by Michael Wetter:
Corrected use ofgetInstanceName()which was called inside a function which is not allowed.
This is for IBPSA, #1814. -
June 21, 2018, by Massimo Cimmino:
First implementation.