modelOffDesignOperation
Calculation of operation for non-nominal/off-design conditions
Information
This model calculates the adiabatic efficiency (reference is the higher heating value (includes vaporization enthalpy)) at off-design conditions for an operating point from a characteristic chart in dependency on:
- Nominal return temperature (TColdNom)
- Nominal temperature difference (TColdNom-THotNom)
- Relative temperature difference
- Relative water mass flow
Parameters
| Type | Name | Default | Description |
|---|
| Modelica.Units.SI.HeatFlowRate | Q_flow_nominal | 50000 | Design thermal capacity |
| Design |
| Modelica.Units.SI.Temperature | TSup_nominal | 273.15 + 80 | Design supply temperature |
| Modelica.Units.SI.Temperature | TRet_nominal | 273.15 + 60 | Design return temperature |
| Advanced |
| String | filename | ModelicaServices.ExternalReferences.loadResource("modelica://AixLib/Resources/Data/Fluid/BoilerCHP/BaseClasses/GenericBoiler/Boiler_Generic_Characteristic_Chart.sdf") | Filename for generic boiler curves |
Components
| Type | Name | Default | Description |
|---|
| AixLib.Controls.Interfaces.BoilerControlBus | boiBus | | Boiler bus |
| Modelica.Blocks.Math.Add | dTMea | | Measured temperature spread |
| Modelica.Blocks.Math.Division | relMFlow | | Calculate relative mass flow rate |
| Modelica.Blocks.Sources.Constant | conMFlowNom | | Nominal mass flow rate |
| Modelica.Blocks.Routing.Multiplex4 | multiplex4 | | |
| SDF.NDTable | boiEff | | Characteristic chart of adiabatic efficiency |
| Modelica.Blocks.Math.Division | relTemSpr | | Relative temperature spread |
| Modelica.Blocks.Sources.Constant | dT_nominal | | Nominal temperature spread |
Contents
| Name | Description |
|---|
| Medium | Medium in the component |
Revisions
-
June, 2023 by Moritz Zuschlag; David Jansen
First Implementation (see issue #1147)