modelCell1DimInc
Information
This model describes the flow of an incompressible fluid through a single cell. An overall flow model can be obtained by interconnecting several cells in series (see Flow1DimInc).
Enthalpy is selected as state variable.
Two types of variables can be distinguished: cell variables and node variables. Node variables are characterized by the su (supply) and ex (exhaust) subscripts, and correspond to the inlet and outlet nodes at each cell. The relation between the cell and node values depends on the discretization scheme selected.
The assumptions for this model are:
The model is characterized by two flow connector and one lumped thermal port connector. During normal operation the fluid enters the model from the InFlow connector and exits from the OutFlow connector. In case of flow reversal the fluid direction is inversed.
The thermal energy transfer through the lateral surface is computed by the ConvectiveHeatTransfer model which is inerithed in the Cell1DimInc model.
Modelling options
In the General tab the following options are availabe:
In the Initialization tab the following options are availabe:
Numerical options
In this tab several options are available to make the model more robust:
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | Nt | 1 | Number of cells in parallel |
| Real | pi | Modelica.Constants.pi | pi-greco |
| Modelica.SIunits.Volume | Vi | Volume of a single cell | |
| Modelica.SIunits.Area | Ai | Lateral surface of a single cell | |
| Modelica.SIunits.MassFlowRate | Mdotnom | Nominal fluid flow rate | |
| Modelica.SIunits.CoefficientOfHeatTransfer | Unom | Nominal Heat transfer coefficient | |
| Initialization | |||
| Modelica.SIunits.Pressure | pstart | Fluid pressure start value | |
| Medium.SpecificEnthalpy | hstart | 1E5 | Start value of enthalpy |
| Numerical options | |||
| Discretizations | Discretization | ThermoCycle.Functions.Enumerations.Discretizations.centr_diff | Selection of the spatial discretization scheme |
| Initialization › Intialization options | |||
| Boolean | steadystate | true | if true, sets the derivative of h (working fluids enthalpy in each cell) to zero during Initialization |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoCycle.Interfaces.Fluid.FlangeA | InFlow | ||
| ThermoCycle.Interfaces.Fluid.FlangeB | OutFlow | ||
| ThermoCycle.Interfaces.HeatTransfer.ThermalPortL | Wall_int |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| HeatTransfer | heatTransfer | ||
| Medium.ThermodynamicState | fluidState | ||
| Medium.AbsolutePressure | p | ||
| Modelica.SIunits.MassFlowRate | M_dot | ||
| Medium.SpecificEnthalpy | h | Fluid specific enthalpy at the cells | |
| Medium.Temperature | T | Fluid temperature | |
| Medium.Density | rho | Fluid cell density | |
| Modelica.SIunits.SpecificEnthalpy | hnode_su | Enthalpy state variable at inlet node | |
| Modelica.SIunits.SpecificEnthalpy | hnode_ex | Enthalpy state variable at outlet node | |
| Modelica.SIunits.HeatFlux | qdot | heat flux at each cell | |
| Modelica.SIunits.Power | Q_tot | Total heat flux exchanged by the thermal port | |
| Modelica.SIunits.Mass | M_tot | Total mass of the fluid in the component |
Contents
| Name | Description |
|---|---|
| Medium | |
 HeatTransfer |