modelTestWaterFlow1DFV2ph_C
Test case for Flow1D2ph
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
The model is designed to test the component Flow1D2ph when used as an evaporator.
This model represent the fluid side of a once-through boiler with an applied external heat flow. The operating fluid is water. The outlet pressure is kept constant, emulating perfect pressure control.
During the simulation, the inlet specific enthalpy and heat flux are changed, while maintaining the inlet flowrate constant:
- t=0 s. The initial state of the water is subcooled liquid.
- t=10 s. Ramp increase of the applied heat flow. The water starts boiling and is blown out of the outlet, whose flowrate undergo a transient increase. At the end of the transient the outlet fluid is in superheated vapour state.
- t=100 s. Step increase of the inlet enthalpy
- t=150 s. The heat flow is brought back to zero. The vapour collapses, causing a suddend decrease in the outlet flowrate, until the liquid fills again the entire boiler. At that instant, the flowrate rises again rapidly to the inlet values.
Simulation Interval = [0...250] sec
Integration Algorithm = DASSL
Algorithm Tolerance = 1e-9
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | pi | Modelica.Constants.pi | |
| Integer | Nnodes | 20 | |
| SI.Length | Lhex | 10 | |
| SI.Diameter | Dhex | 0.06 | |
| SI.Thickness | thhex | 0 | |
| SI.Radius | rhex | Dhex/2 | |
| SI.Length | omegahex | Dhex | |
| SI.Area | Ahex | pi*rhex^2 | |
| SI.PerUnit | Cfhex | 0.005 |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Mass | Mhex | Mass in the heat exchanger | |
| SI.Mass | Mbal | Mass resulting from the mass balance | |
| SI.Mass | Merr | Mass balance error | |
| Water.Flow1DFV2ph | hex | ||
| Thermal.HeatSource1DFV | heatSource | ||
| ThermoPower.Water.SinkPressure | Sink | ||
| Modelica.Blocks.Sources.Ramp | hIn | ||
| Modelica.Blocks.Sources.Ramp | extPower | ||
| ThermoPower.Water.SourceMassFlow | Source | ||
| Modelica.Blocks.Sources.Ramp | extPower2 | ||
| Modelica.Blocks.Math.Add | Add1 | ||
| System | system |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
- 7 Jan 2015 by Francesco Casella:
Updated to new FEM model. - 26 Jul 2007 by Francesco Casella:
Parameters updated. - 10 Dec 2005 by Francesco Casella:
Parameters updated. - 1 Oct 2003 by Francesco Schiavo:
First release.