modelConvectionAndRadiation_tubeBank_L2

Shell Geo || L2 || Convection And Radiation Inside Tube Banks
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Extends from ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Gas_HT.Convection.HeatTransfer_L2, ClaRa.Basics.Icons.AlphaEpsilon.

Information

Model description: A correlation for radiant and convective heat transfer inside tube banks

FEATURES

  • This model uses TILMedia
  • Aligned, staggered or partly staggered tubes supported
  • Emissivity and Absorbance of flue gas can be calculated
  • Emissivity of particles can is regarded as constant value
  • Needs geometry model for tube banks
  • Equations according to: VDI-Wärmeatlas: 10.bearbeitete und erweiterte Auflage, 2006, chapter Kc and Gg

 

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)
IntegerheatSurfaceAlloc2To be considered heat transfer area
Heat Transfer
StringtemperatureDifference (from HeatTransfer_L2)"Logarithmic mean - smoothed"Temperature Difference
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
Realemissivity_tubes0.8Emissivity of the tubes
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

Connectors

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

Components

TypeNameDefaultDescription
ClaRa.Basics.Records.IComGas_L2iCom (from HeatTransfer_L2)
RealCF_fouling (from HeatTransfer_L2)0.8Scaling factor accounting for the fouling of the wall
Units.TemperatureDelta_T_wi (from HeatTransfer_L2)Temperature difference between wall and fluid inlet temperature
Units.TemperatureDelta_T_wo (from HeatTransfer_L2)Temperature difference between wall and fluid outlet temperature
Units.TemperatureDelta_T_mean (from HeatTransfer_L2)Mean temperature
Units.TemperatureDelta_T_U (from HeatTransfer_L2)Upper temperature difference
Units.TemperatureDelta_T_L (from HeatTransfer_L2)Lower temperature difference
ClaRa.Basics.Units.VelocitywFlue gas velocity
ClaRa.Basics.Units.HeatFlowRateQ_flow_radRadiative heat flow
ClaRa.Basics.Units.HeatFlowRateQ_flow_convConvective heat flow
Realemissivity_suspensionEmissivity
Realabsorbance_suspensionAbsorbance
RealalphaConvective heat transfer coefficient
Reals_glEquivalent thickness
RealNu_llamNusselt number laminar
RealNu_lturbNusselt number turbulent
RealNu_l0Nusselt number
RealNu_tubeBankNusselt number at tube bank
Units.TemperatureT_mean_radMean temperature for radiation

Revisions

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