modelRadiation_gas2Wall_advanced_L2

All Geo || L2 || Radiation Between Gas And Wall (Advanced)
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Extends from ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Gas_HT.Radiation.HeatTransfer_L2, ClaRa.Basics.Icons.Epsilon.

Information

Model description: A correlation for radiant heat transfer between gas and wall inside furnaces

FEATURES

  • This model uses TILMedia
  • Emissivity and Absorbance of flue gas can be calculated
  • Emissivity of particles is regarded as constant value
  • Configuration factors are regarded (radiating gas volume is treated as radiating surface)
  • Equations according to: VDI-Wärmeatlas: 10. bearbeitete und erweiterte Auflage, 2006, chapters Kb, Kc and Kd
  • Heat transfer equations are chosen as eq. (18) from chapter Kc if property calculations are not considered or eq. (6a) from chapter Ke (better approximation especially for surfaces with higher reflexion) if emissivities and absorbances are calculated
  • Particle parameters are to be set according to the Rosin-Rammler-Distribution

 

For detailed model documentation please consult the html-documentation shipped with ClaRa.

 


Authorship and Copyright Statement for original (initial) Contribution

Author:

DYNCAP/DYNSTART development team, Copyright © 2011-2024.

References:

For references please consult the html-documentation shipped with ClaRa.

Remarks:

This component was developed by ClaRa development team under the 3-clause BSD License.

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.

The ClaRa development team consists of the following partners:

TLK-Thermo GmbH (Braunschweig, Germany)

XRG Simulation GmbH (Hamburg, Germany).

Parameters

TypeNameDefaultDescription
Stringgas (from HeatTransferBaseGas)"true"
BooleanuseHomotopy (from HeatTransfer_L2)
Realemissivity_wall0.8Emissivity of the wall
IntegerheatSurfaceAlloc1To be considered heat transfer area
Emissivity and absorbance factor calculation of the suspension volume
Stringsuspension_calculationType"Fixed"Calculation type
Realemissivity_suspension_fixed0.9Fixed value for gas emissivity
Realabsorbance_suspension_fixed0.9Fixed value for gas absorbance
Realemissivity_particle0.2Value considering dust particles if emissivity and absorbance are calculated
Soot particle properties
ClaRa.Basics.Units.DensityMassSpecificsoot_load_n163.5e-6Amount of soot inside the products at standard temperature and pressure
Coal particle properties
ClaRa.Basics.Units.MassFractionx_coke0.1Coke fraction of used coal
ClaRa.Basics.Units.DensityMassSpecificd_coke850Coke density
ClaRa.Basics.Units.Lengthdiameter_mean_coke65e-6Mean weighted diameter of coke particles (Rosin-Rammler-Distribution)
Realn_var_coke1.5Variance parameter of coke particle distribution (Rosin-Rammler-Distribution)
RealQ_mean_abs_coke0.85Mean relative cross section for absorption of coke particles
Ash particle properties
ClaRa.Basics.Units.DensityMassSpecificd_ash2200Ash density
ClaRa.Basics.Units.Lengthdiameter_mean_ash16.8e-6Mean weighted diameter of ash particles (Rosin-Rammler-Distribution)
Realn_var_ash1.5Variance parameter of ash particle distribution (Rosin-Rammler-Distribution)
RealQ_mean_abs_ash0.2Mean relative cross section for absorption of ash particles
Heat Transfer
StringtemperatureDifference"Outlet"Temperature Difference

Connectors

TypeNameDefaultDescription
ClaRa.Basics.Interfaces.HeatPort_aheat (from HeatTransfer_L2)

Components

TypeNameDefaultDescription
ClaRa.Basics.Records.IComGas_L2iCom
RealCF_fouling0.8Scaling factor accounting for the fouling of the wall
Units.TemperatureDelta_T_meanMean temperature
Realemissivity_suspensionEmissivity
Realabsorbance_suspensionAbsorbance
Realview_factor_wallRadiation view factor
Reals_glEquivalent thickness

Revisions

For revisions please consult the html-documentation shipped with ClaRa.