BoundaryGas pTxi
Created Tuesday 18 March 2014
This model provides a boundary condition specified by specific enthalpy and pressure.
1. Purpose of Model
This model can be used to set up constant or variable boundary conditions for a gas medium for example inside the flue gas path. It serves as an idealised boundary giving a pressure, temperature and gas composition. It could be used together with a second BoundaryGas pTxi serving as an additional pressure boundary condition or with BoundaryGas Txim flow giving a mass flow.
2. Level of Detail, Physical Effects Considered and Physical Insight
2.1 Level of Detail
Referring to Brunnemann et al. [1], this model refers to the level of detail L1 because the system is modeled without the use of balance equations.
2.2 Physical Effects Considered
- set values for temperature and pressure at outlet connector
2.3 Level of Insight
No different levels of detail are available.
3. Limits of Validity
- Real sources with complex pressure dependence of mass flow cannot be covered by this model.
4. Interfaces
4.1 Physical Connectors
Basics:Interfaces:GasPortIn gas_a
4.2 Summaries
4.3 Inputs
- Real Input value for:
- Thermodynamic pressure in the connection port [Pa].
- Temperature close to the connection port [K].
- Gas composition close to the connection port [kg_x/kg_tot].
- Medium properties at the port.
4.2 Medium Models.
- Fluid Medium Model at the inlet port
5. Nomenclature
6. Governing Equations
This model simply converts the real input values pressure, temperature and medium composition into a ClaRa gas stream connector. The mass flow rate inside the connector results from the second (fixed pressure or fixed mass flow rate) boundary condition BoundaryGas pTxi or BoundaryGas Txim flow and the pressure losses of the gas path.
6.1 System Description and General model approach
6.2 General Model Equations
Since this model is an idealised boundary, no balance equations are used.
7. Remarks for Usage
If operated as an ideal boundary source, the model represents the set up pressure and temperature, no matter what the mass flow through the physical connector is.
8. Validation
9. References
[1] Johannes Brunnemann and Friedrich Gottelt, Kai Wellner, Ala Renz, André Thüring, Volker Röder, Christoph Hasenbein, Christian Schulze, Gerhard Schmitz, Jörg Eiden: "Status of ClaRaCCS: Modelling and Simulation of Coal-Fired Power Plants with CO2 capture", 9th Modelica Conference, Munich, Germany, 2012
10. Authorship and Copyright Statement for original (initial) Contribution
Author:
DYNCAP/DYNSTART development team, Copyright 2011 - 2022.
Remarks:
This component was developed during DYNCAP/DYNSTART projects.
Acknowledgements:
Acknowledgements:
ClaRa originated from the collaborative research projects DYNCAP and DYNSTART. Both research projects were supported by the German Federal Ministry for Economic Affairs and Energy (FKZ 03ET2009 and FKZ 03ET7060).
CLA:
The author(s) have agreed to ClaRa CLA, version 1.0. See https://claralib.com/pdf/CLA.pdf
By agreeing to ClaRa CLA, version 1.0 the author has granted the ClaRa development team a permanent right to use and modify his initial contribution as well as to publish it or its modified versions under the 3-clause BSD License.
11. Version History
25.06.2013 - v0.1 - initial implementation of the model - André Thüring, TLK-Thermo GmbH
03.04.2019 - added eye connector
Backlinks: ClaRa:A User Guide:Revisions:v1.4.1 ClaRa:Components:BoundaryConditions:BoundaryGas Txim flow ClaRa:Components:BoundaryConditions:BoundaryGas pTxi