modelMultipoleThermalResistances_TwoUTube
Validation of the thermal resitances 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.multipoleThermalResistances for the evaluation of the borehole thermal resistances.
The multipole method is used to evaluate thermal resistances for a double U-tube borehole with symmetrically positionned pipes. Results are compared to reference values given in Claesson (2012).
References
Claesson, J. (2012). Multipole method to calculate borehole thermal resistances. Mathematical report. Department of Building Physics, Lund University, Box 118, SE-221 00 Lund, Sweden. 128 pages.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nPip | 4 | Number of pipes |
| Integer | J | 3 | Number of multipoles |
| Modelica.Units.SI.Position | xPip | {0.03, -0.03, -0.03, 0.03} | x-Coordinates of pipes |
| Modelica.Units.SI.Position | yPip | {0.03, 0.03, -0.03, -0.03} | y-Coordinates of pipes |
| Modelica.Units.SI.Radius | rBor | 0.07 | Borehole radius |
| Modelica.Units.SI.Radius | rPip | fill(0.02, nPip) | Outter radius of pipes |
| Modelica.Units.SI.ThermalConductivity | kFil | 1.5 | Thermal conductivity of grouting material |
| Modelica.Units.SI.ThermalConductivity | kSoi | 2.5 | Thermal conductivity of soil material |
| Real | RFluPip | fill(1.2/(2*Modelica.Constants.pi*kFil), nPip) | Fluid to pipe wall thermal resistances |
| Modelica.Units.SI.Temperature | TBor | 0 | Average borehole wall temperature |
| Real | RDelta_Ref | {{1/3.61, 1/0.35, -1/0.25, 1/0.35}, {1/0.35, 1/3.61, 1/0.35, -1/0.25}, {-1/0.25, 1/0.35, 1/3.61, 1/0.35}, {1/0.35, -1/0.25, 1/0.35, 1/3.61}} | Reference delta-circuit thermal resistances |
| Real | R_Ref | {{0.2509, 0.0192, -0.0122, 0.0192}, {0.0192, 0.2509, 0.0192, -0.0122}, {-0.0122, 0.0192, 0.2509, 0.0192}, {0.0192, -0.0122, 0.0192, 0.2509}} | Reference internal thermal resistances |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | RDelta | Delta-circuit thermal resistances | |
| Real | R | Internal thermal resistances |
Revisions
-
June 21, 2018, by Massimo Cimmino:
First implementation.