modelPrescribed3
Example - Isobaric process
Extends from Modelica.Icons.Example (Icon for runnable examples).
Information
This example illustrates several variants of using the
IsobaricCycle process (specifyOutlet = true and heatFlowSignal not= Input) defined by discontinuous inputs.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.AbsolutePressure | p_inf | 100000 | Ambient pressure |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MassFlowRate | m_flow | massFlowRate.y | Mass flow rate |
| Medium.AbsolutePressure | p | inletPressure.y | Pressure (inlet = outlet) |
| Medium.Temperature | T_in | inletTemperature.y | Inlet temperature |
| SI.TemperatureDifference | dT | temperatureDifference.y | Temperature difference |
| Medium.Temperature | T_out | T_in + dT | Outlet temperature |
| Medium.ThermodynamicState | state_in | Medium.setState_pTX(p, T_in, Medium.X_default) | Inlet state |
| Medium.ThermodynamicState | state_out | Medium.setState_pTX(p, T_out, Medium.X_default) | Outlet state |
| Medium.SpecificEnthalpy | h_in | Medium.specificEnthalpy(state_in) | Inlet specific enthalpy |
| Medium.SpecificEnthalpy | h_out | Medium.specificEnthalpy(state_out) | Outlet specific enthalpy |
| Medium.SpecificEnthalpy | dh | h_out - h_in | Specific enthalpy difference |
| Medium.SpecificEnergy | q | dh | Specific heat flow rate |
| SI.HeatFlowRate | Q_flow | m_flow*q | Heat flow rate |
| Medium.Density | rho_in | Medium.density(state_in) | Inlet density |
| Medium.Density | rho_out | Medium.density(state_in) | Outlet density |
| SI.SpecificVolume | v_in | 1/rho_in | Inlet density |
| SI.SpecificVolume | v_out | 1/rho_out | Outlet density |
| Medium.SpecificEnergy | u_in | h_in - p/rho_in | Inlet specific internal energy |
| Medium.SpecificEnergy | u_out | h_out - p/rho_out | Outlet specific internal energy |
| Medium.SpecificEnergy | du | u_out - u_in | Specific internal energy difference |
| SI.SpecificEnergy | w_exp | -p*(v_out - v_in) | Specific expansion work |
| SI.SpecificEnergy | w_amb | -p_inf*(v_out - v_in) | Specific ambient pressure work |
| SI.SpecificEnergy | w_exp_net | w_exp - w_amb | Net specific expansion work |
| SI.Power | P | m_flow*w_exp_net | Net power (net expansion work flow rate) |
| ThermofluidStream.DropOfCommons | dropOfCommons | ||
| Modelica.Blocks.Sources.SawTooth | inletPressure | ||
| Modelica.Blocks.Sources.SawTooth | inletTemperature | ||
| Modelica.Blocks.Sources.SawTooth | temperatureDifference | ||
| Modelica.Blocks.Sources.SawTooth | massFlowRate | ||
| Modelica.Blocks.Sources.RealExpression | heatFlowRate | ||
| EnergyFlow.Sources.PrescribedEnergyFlow | energyFlowSource | ||
| ThermofluidStream.Boundaries.Source | source | ||
| ThermofluidStream.Idealized.Processes.Isobaric | isobaric | ||
| .ThermofluidStream.Boundaries.Sink_m | sink | ||
| ThermofluidStream.Boundaries.Source | source1 | ||
| ThermofluidStream.Idealized.Processes.Isobaric | isobaricCycle | ||
| .ThermofluidStream.Boundaries.Sink_m | sink1 |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
-
2026, by Raphael Gebhart (raphael.gebhart@dlr.de):
Initial version.