modelClosedSystemInit
Component for the steady-state initialization of closed systems
Information
This component can be used for the steady-state initialization of closed-system where all components have steady-state initial conditions. Without this component such systems would give rise to undetermined initial conditions, i.e., the amount of fluid and the initial pressures in the system would be unspecified.
Connect the component to one point of the system. If initEquationFromInput = false, the system is initialized with pressure equal to pstart at the connection point.
It is possible to use a generic initial equation instead of p = pstart, e.g., to set the initial charge of a refrigeration circuit, by setting initEquationFromInput = true and connecting to the input the output of a Modelica.Blocks.Sources.RealExpression component, containing the residual of the initial equation. In this case, if useHomotopy = true, the simplified initial equation is (p - pstart)/pstart = 0. To ensure a smooth homotopy transformation, it is recommended to write the residual in normalized form, i.e., with values have the order of magnitude of one, as for the simplified equation.
Parameters
| Type | Name | Default | Description |
|---|
| Medium.AbsolutePressure | pstart | | Start value of pressure |
| Boolean | useHomotopy | | Use homotopy for residual-based initialization |
| Medium.MassFlowRate | w_b | | Initial balance flow rate eventually equal to zero |
| External inputs |
| Boolean | initEquationFromInput | false | Get initial condition residual from input connector |
Contents
| Name | Description |
|---|
 Medium | |
