modelTestRefrigerantEvaporator
Information
The model is designed to test the component Water.Flow1DFV (fluid side of a heat exchanger, model uses finite volumes).
This model represent the two fluid sides of a heat exchanger made by two concentric tubes in counterflow configuration. The thickness of the wall separating the two tubes is negligible. The operating fluid is liquid water. The mass flow rate during the experiment and initial conditions are the same for the two sides.
During the simulation, the inlet specific enthalpy for hexA ("hot side") is changed at time t = 50 s. The outlet temperature of the hot side starts changing after the fluid transport time delay, while the outlet temperature of the cold side starts changing immediately.
Simulation Interval = [0...1200] sec
Integration Algorithm = DASSL
Algorithm Tolerance = 1e-6
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | Nnodes | 10 | number of nodes |
| SI.Length | Dint | 5e-3 | Internal diameter of refrigerant tube |
| SI.Length | th | 0.5e-3 | Thickness of refrigerant tube |
| SI.Length | Dext | Dint + 2*th | External diameter of refrigerant tube |
| SI.Length | Dgas | 20e-3 | External diameter of gas tube |
| SI.Length | L | 10 | Length of refrigerant tube |
| Real | pi | Modelica.Constants.pi |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Temperature[:] | Tgas | gasFlow.T[end:-1:1] | Alias variable for direct comparisons |
| SI.Temperature[:] | Tfluid | fluidFlow.T | Alias variable for direct comparisons |
| SI.Temperature[:] | Twall | tubeWall.Tvol | Alias variable for direct comparisons |
| SI.SpecificEnthalpy[:] | hl | fluidFlow.hl*ones(Nnodes) | |
| SI.SpecificEnthalpy[:] | hv | fluidFlow.hv*ones(Nnodes) | |
| Water.SinkPressure | fluidSink | ||
| Gas.SinkPressure | gasSink | ||
| Water.SourceMassFlow | fluidSource | ||
| Water.SensT | fluid_T_in | ||
| Gas.SensT | gas_T_in | ||
| Gas.SourceMassFlow | gasSource | ||
| Water.SensT | fluid_T_out | ||
| Gas.SensT | gas_T_out | ||
| System | system | ||
| Gas.Flow1DFV | gasFlow | ||
| Water.Flow1DFV2ph | fluidFlow | ||
| Thermal.CounterCurrentFV | counterCurrentFV | ||
| Thermal.MetalTubeFV | tubeWall | ||
| Modelica.Blocks.Sources.Ramp | ramp | ||
| Modelica.Blocks.Sources.Ramp | ramp1 |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
- 18 Sep 2013 by Francesco Casella:
Updated to new FV structure. Updated parameters. - 1 Oct 2003 by Francesco Schiavo:
First release.