modelBaseModelStaticBoundaries
Information
This model prescribes static inlet and outlet conditions of the compressor. Furhtermore, it prescribes the rotational speed. The model is used to validate the compressor model in general as well as to identify efficiencies that describes the compressor's behaiviour in a suitable way. Therefore, both calculated mass flow rate and calculated power consumption are compared with the corresponding experimental data.
Required information
The User needs to define the following information in order to complete the model:
- Basic definitions of the compressor. For example, the displacement volume.
- Calculation approaches of the three efficiencies of the compressor.
- Static boundaries of the compressor obtained, for example, by experimental data.
To add static boundary conditions, a combi time table is included within the model. The columns are defined as follows:
- Time steps (0,1,2,3,...).
- Rotational speed in
Hz. - Pressure at inlet in
bar. - Temperature at inlet in
°C. - Pressure at outlet in
bar. - Temperature at outlet in
°C. - Power consumption in
kW. - Mass flow rate in
kg/s.
References
C. Cuevas und J. Lebrun. (2009): Testing and modelling of a variable speed scroll compressor.. In: Applied Thermal Engineering, 29(2):469–478
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| General › Compressors | |||
| Integer | nCom | 1 | Numer of compressors in parallel |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Controls.Interfaces.ModularHeatPumpControlBus | dataBus | Connector that contains all control signals |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Sources.CombiTimeTable | inpDat | Static boundaries of compressor model | |
| Modelica.Blocks.Sources.RealExpression | inpRotSpe | Expressions describing rotational speed | |
| Modelica.Blocks.Sources.RealExpression | inpPreSin | Expressions describing pressure at compressors' outlets | |
| Modelica.Blocks.Sources.RealExpression | inpTemSin | Expressions describing temperature at compressors' outlets | |
| Modelica.Blocks.Sources.RealExpression | inpPreSou | Expressions describing pressure at compressors' inlets | |
| Modelica.Blocks.Sources.RealExpression | inpTemSou | Expressions describing temperature at compressors' inlets | |
| Modelica.Blocks.Interaction.Show.RealValue | dfPowEle | Difference between power consumptions that are measured and calculated | |
| Modelica.Blocks.Interaction.Show.RealValue | dMasFlo | Difference between mass flow rates that are measured and calculated | |
| Modelica.Blocks.Interaction.Show.RealValue | dPowEleRel | Relative difference between power consumptions that are measured and calculated | |
| Modelica.Blocks.Interaction.Show.RealValue | dMasFloRel | Relative difference between mass flow rates that are measured and calculated | |
| Modelica.Thermal.HeatTransfer.Sources.FixedTemperature | ambTemp | Source that prescribes boundary ambient temperature (Dummy) | |
| Modelica.Thermal.HeatTransfer.Components.ThermalCollector | thrCol | Model to split the ambient temperature | |
| Modelica.Blocks.Routing.Replicator | repMea | Replicating the current value of the manipulated variables | |
| Sources.Boundary_pT | sou | Source with prescribed pressure and temperature | |
| ModularCompressors.ModularCompressorsSensors | modCom | Model that describes modular compressors in parallel | |
| Sources.Boundary_pT | sin | Sink with prescribed pressure and temperature | |
| Real | inpPEle | inpDat.y[6]*1000 | Power consumption of the compressor |
| Real | inpTime | time | Simulation time |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
- December 16, 2017, by Mirko Engelpracht:
First implementation (see issue 467).