modelTestWaterFlow1DFV2ph_A

Test case for Flow1DFV2ph

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.

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 pressure and 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 pressure and 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

Type	Name	Default
Real	pi	Modelica.Constants.pi
Integer	Nnodes	10
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

Type	Name	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
ThermoPower.Water.ValveLin	valve
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
Modelica.Blocks.Sources.Ramp	xValve
System	system

Name	Description
Medium