Linear NominalPoint

Created Monday 08 July 2013
This simple model provides a dynamic pressure drop model, which is proportional to the flow rate and to the opening input, without computing any fluid property.

1. Purpose of Model

The model can be used for introducing pressure loss effects (either due to physical or numerical motivation), when a simple model of a variable pressure loss is sufficient. Since the model neglects changes in kinetic energy it suits best in incompressible flow conditions. It is possible to use the valve as a check valve, for example to avoid back flows. Since the model is very simple and has no non linearity it is very robust.

2. Level of Detail and Physical Effects Considered

2.1 Level of Detail

Referring to Brunnemann et al. [1], this model refers to the level of detail L1 because no spatially discretisation is featured.

2.2 Physical Effects Considered

linear losses depending on valve opening and mass flow rate

3. Limits of Validity

small pressure difference, no considerable density changes may occur
no choked conditions calculated

4. Interfaces

5. Nomenclature

6. Governing Equations

Using the Hydraulic conductance, , the mass flow is given by the effective aperture of the valve,

7. Remarks for Usage

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:
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

2013-07-04 - v0.1 - initial implementation - Friedrich Gottelt, XRG Simulation