modelCompressor
Generic volumetric compressor model
Information
The Compressor model represents the expansion of a fluid in a volumetric machine. It is a lumped model based on performance curves. It is characterized by two flow connector for the fluid inlet and outlet and by a mechanical connector for the connection with the generator.
The assumptions for this model are:
- No dynamics ( it is considered negligible when compared to the one characterizing the heat exchanger).
- No thermal energy losses to the environment
- Isentropic efficiency based on empirical performance curve
- Filling factor based on empirical performance curve
Modelling options
In this model, the user has the choice of providing constant isentropic and volumetric efficiencies, or providing performance curves for these two variables.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | epsilon_s | 0.7 | Isentropic Efficiency |
| Real | epsilon_v | 1 | Volumetric efficiency |
| Modelica.SIunits.Volume | V_s | 1e-4 | Swept volume |
| Initialization | |||
| Real | epsilon_start | 0.5782 | Isentropic Efficiency |
| Real | epsilon_v_start | 1 | Volumetric Efficiency |
| Modelica.SIunits.Pressure | p_su_start | 2.339e5 | Inlet pressure start value |
| Modelica.SIunits.Pressure | p_ex_start | 1.77175e6 | Outlet pressure start value |
| Modelica.SIunits.Temperature | T_su_start | 293.15 | Inlet temperature start value |
| Medium.SpecificEnthalpy | h_su_start | Medium.specificEnthalpy_pT(p_su_start, T_su_start) | Inlet enthalpy start value |
| Medium.SpecificEnthalpy | h_ex_start | Medium.specificEnthalpy_pT(p_ex_start, T_su_start) | Outlet enthalpy start value |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Mechanics.Rotational.Interfaces.Flange_b | flange_elc | Flange of shaft | |
| Interfaces.Fluid.FlangeA | InFlow | ||
| Interfaces.Fluid.FlangeB | OutFlow |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.ThermodynamicState | vaporIn | Thermodynamic state of the fluid at the inlet | |
| Medium.ThermodynamicState | vaporOut | Thermodynamic state of the fluid at the outlet - isentropic | |
| Real | rpm | ||
| Modelica.SIunits.Frequency | N_rot | ||
| Modelica.SIunits.Power | W_dot | ||
| Modelica.SIunits.VolumeFlowRate | V_dot_su | ||
| Modelica.SIunits.MassFlowRate | M_dot | ||
| Medium.Density | rho_su | ||
| Medium.SpecificEntropy | s_su | ||
| Medium.SpecificEnthalpy | h_su | ||
| Medium.SpecificEnthalpy | h_ex | ||
| Medium.AbsolutePressure | p_su | ||
| Medium.AbsolutePressure | p_ex | ||
| Medium.SpecificEnthalpy | h_ex_s |
Contents
| Name | Description |
|---|---|
| Medium |