Constant L3 ypsDependent
Created Monday 10 June 2013
A heat transfer model based on constant heat transfer coefficient (htc) for the two zones with a relative volume (yps) dependency.
1. Purpose of Model
This model is appropriate when the heat flow rate depends only on the temperature difference but not on the heat transfer coefficient. This model is numerically very robust due to missing dependency on the actual flow and fluid state. Two different heat transfer coefficients can be parametrized for the two zones. The heat flow rate is calculated with respect to the volume fraction.
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 L3 since no spacial resolution of the heat transfer is assumed.
2.2 Physical Effects Considered
- different heat transfer coefficients for the two zones
- volume fraction, i.e. filling level, weighting of the heat transfer
3. Limits of Validity
- no dependencies of fluid properties, e.g. from density or Prandtl - number
4. Interfaces
The model communicates via outer models and records. Thus its expects to have:
- an outer model named geo as defined Fundamentals:Geometry:GenericGeometry
- an outer record named iCom as defined in Basics:Records:IComBase L2
5. Nomenclature
6. Governing Equations
Eq. (1) is calculated for the two zones, thus receiving the Heat flow rate array 
.
The heat transfer coefficient array α is equal to the user-defined nominal heat transfer coefficient:
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
- Date - Version - Description of changes - author/revisor
Backlinks: ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph BU ntu ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph BU simple ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph CH ntu ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph CH simple ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph CU ntu ClaRa:Components:HeatExchangers:HEXvle2vle L3 2ph CU simple ClaRa:Components:MechanicalSeparation:BalanceTank L3 ClaRa:Basics:ControlVolumes:FluidVolumes:VolumeVLEGas L3 ClaRa:Basics:ControlVolumes:FluidVolumes:VolumeVLE L3 TwoZones ClaRa:Basics:ControlVolumes:FluidVolumes:VolumeVLE L3 TwoZonesNPort