modelMultipoleThermalResistances_OneUTube
Validation of the thermal resitances for a single 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 single U-tube borehole with asymmetrically positionned pipes. Results are compared to reference values given in Claesson and Hellström (2011).
References
Claesson, J., & Hellström, G. (2011). Multipole method to calculate borehole thermal resistances in a borehole heat exchanger. HVAC&R Research, 17(6), 895-911.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nPip | 2 | Number of pipes |
| Integer | J | 3 | Number of multipoles |
| Modelica.Units.SI.Position | xPip | {0.03, -0.03} | x-Coordinates of pipes |
| Modelica.Units.SI.Position | yPip | {0.00, 0.02} | 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 | {{1/3.680, 1/0.242}, {1/0.242, 1/3.724}} | Reference delta-circuit thermal resistances |
| Real | R_Ref | {{0.25592, 0.01561}, {0.01561, 0.25311}} | 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.