Convection regenerativeAirPreheater L4

Created Monday 11 April 2016

A model used to calculate the heat transfer coefficient inside a regenerative air preheaters according to [1].

1. Purpose of Model


A model used to calculate the heat transfer coefficient inside regenerative air preheaters by neglection of the periodic times below 1 minute according to[1].

2. Level of Detail, Physical Effects Considered and Physical Insight


2.1 Level of Detail


Referring to Brunnemann et al. [2], this model refers to the level of detail L2.

3. Limits of Validity


According to [1] this model is valid for periodic times above 1 minute.

4. Interfaces


4.1 Physical Connectors


Basics:Interfaces:HeatPort a heat

5. Nomenclature



6. Governing Equations


This model is used inside discretizable component models but for the sake of simplicity the cell index is omitted here.

The mean temperature difference is calculated as arithmetic mean between in- and outlet of the cell:


The mean velocity of the gas is calculated as follows:


With the velocity, the hydraulic diameter, dynamic viscosity and density the Reynolds number is calculated:


The heat transfer coefficient is then calculated as follows:


7. Remarks for Usage


Usage inside limits of validity recommended.

8. Validation



9. References

[1] Helmut Effenberger: "Dampferzeugung", Springer-Verlag Berlin Heidelberg New York, 2000, ISBN:3-450-64175-0
[2] 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:RegenerativeAirPreheaterSecAir L4 ClaRa:Components:HeatExchangers:RegenerativeAirPreheater L4