modelTestWaterFlow1DFEM_A
Test case for Flow1DFEM
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
The model is designed to test the component Flow1Dfem (fluid side of a heat exchanger, finite element method).
This model represent the fluid side of a heat exchanger with an applied external heat flow. The operating fluid is liquid water.
During the simulation, the inlet specific enthalpy, heat flux and mass flow rate are changed:
- t=0 s, Step variation of the specific enthalpy of the fluid entering the heat exchanger. The outlet temperature should undergo a step change 10 s later.
- t=30 s, Step variation of the thermal flow entering the heat exchanger lateral surface. The outlet temperature should undergo a ramp change lasting 10 s
- t=50 s, Step variation of the mass flow rate entering the heat exchanger. Again, the outlet temperature should undergo a ramp change lasting 10s
Simulation Interval = [0...80] sec
Integration Algorithm = DASSL
Algorithm Tolerance = 1e-6
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | Nnodes | 12 | |
| Modelica.SIunits.Length | Lhex | 10 | |
| Modelica.SIunits.Diameter | Dihex | 0.02 | |
| Modelica.SIunits.Radius | rhex | Dihex/2 | |
| Modelica.SIunits.Length | omegahex | Modelica.Constants.pi*Dihex | |
| Modelica.SIunits.Area | Ahex | Modelica.Constants.pi*rhex^2 | |
| Real | Cfhex | 0.005 | |
| Modelica.SIunits.MassFlowRate | whex | 0.3 | |
| Modelica.SIunits.Pressure | phex | 2e5 | |
| Modelica.SIunits.SpecificEnthalpy | hinhex | 1e5 | |
| Modelica.SIunits.SpecificEnthalpy | houthex | 1e5 | |
| Modelica.SIunits.SpecificEnthalpy | deltah | 41800 | |
| Modelica.SIunits.EnergyFlowRate | W | 41800*whex |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.Water.SourceMassFlow | Fluid_Source | ||
| ThermoPower.Water.SinkPressure | Fluid_Sink | ||
| ThermoPower.Water.ValveLin | Valve | ||
| Water.Flow1DFEM | hex | ||
| ThermoPower.Water.SensT | T_in | ||
| Thermal.HeatSource1DFEM | HeatSource1D1 | ||
| Modelica.Blocks.Sources.Step | MassFlowRate | ||
| Modelica.Blocks.Sources.Constant | Constant1 | ||
| Modelica.Blocks.Sources.Step | InSpecEnthalpy | ||
| Modelica.Blocks.Sources.Step | ExtPower | ||
| ThermoPower.Water.SensT | T_out | ||
| System | system |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
- 7 Jan 2015 by Francesco Casella:
Updated to new FEM model.
- 1 Oct 2003 by Francesco Schiavo:
First release.