modelHEXvle2vle_L3_2ph_CU_ntu
VLE 2 VLE | L3 | 2 phase at shell side | Cylinder shape | U-type | NTU ansatz
Extends from ClaRa.Basics.Icons.HEX04, ClaRa.Basics.Icons.ComplexityLevel (Displays the complexity level inside model icon ).
Information
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
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | parallelTubes | if orientation == flowOrientation and N_baffle == 0 then true elseif orientation <> flowOrientation and N_baffle == 0 then true else false | True if tues are parallel to shell flow orientation |
| Real[2] | yps_nom | {yps_liq_nom, 1 - yps_liq_nom} | Relative volume of liquid phase [1] and vapour phase [2] at nominal point |
| Basics.Units.Time | Tau_cond | 0.3 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|Time constant of condensation |
| Basics.Units.Time | Tau_evap | 0.03 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|Time constant of evaporation |
| Basics.Units.CoefficientOfHeatTransfer | alpha_ph | 50000 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|HTC of the phase border |
| Basics.Units.Area | A_phaseBorder | shell.geo.A_hor*100 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|Heat transfer area at phase border |
| Real | expHT_phases | 0 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|Exponent for volume dependency on inter phase HT |
| Real | absorbInflow | 1 | |Expert Settings|Inter-Phase Heat and Mass Transfer at Shell Side|Absorption of incoming mass flow to the zones 1: perfect in the allocated zone, 0: perfect according to steam quality |
| Real | gain_eff | 1 | |Expert Settings|NTU model|Avoid effectiveness > 1, high gain_eff leads to stricter observation but may cause numeric errors |
| Basics.Units.Time | Tau_stab | 0.1 | |Expert Settings|NTU model|Time constant for numeric stabilisation w.r.t. heat flow rates |
| Boolean | showExpertSummary | simCenter.showExpertSummary | |Summary and Visualisation||True, if expert summary should be applied |
| Boolean | showData | true | |Summary and Visualisation||True, if a data port containing p,T,h,s,m_flow shall be shown, else false |
| Fundamental Definitions | |||
| Boolean | useHomotopy | simCenter.useHomotopy | True, if homotopy method is used during initialisation |
| Shell Side › Fundamental Definitions | |||
| TILMedia.VLEFluid.Types.BaseVLEFluid | medium_shell | simCenter.fluid1 | Medium to be used for shell side |
| Shell Side › Geometry | |||
| Basics.Units.Length | length | 10 | Length of the HEX |
| Basics.Units.Length | diameter | 3 | Diameter of HEX |
| Basics.Choices.GeometryOrientation | orientation | ClaRa.Basics.Choices.GeometryOrientation.vertical | Orientation of the component |
| Basics.Choices.GeometryOrientation | flowOrientation | ClaRa.Basics.Choices.GeometryOrientation.vertical | Flow orientation at shell side |
| Basics.Units.Length | z_in_shell | length/2 | Inlet position from bottom |
| SI.Length | z_in_aux1 | length/2 | Inlet position of auxilliary1 from bottom |
| SI.Length | z_in_aux2 | length/2 | Inlet position of auxilliary2 from bottom |
| Basics.Units.Length | z_out_shell | length/2 | Outlet position from bottom |
| SI.Length | radius_flange | 0.05 | Flange radius |
| Integer | N_baffle | 0 | Number of baffles at shell side |
| Basics.Units.Mass | mass_struc | 0 | Mass of inner structure elements, additional to the tubes itself |
| Shell Side › Nominal Values | |||
| Basics.Units.MassFlowRate | m_flow_nom_shell | 10 | Nominal mass flow at shell side |
| Basics.Units.Pressure | p_nom_shell | 10 | Nominal pressure at shell side |
| Basics.Units.EnthalpyMassSpecific | h_nom_shell | 100e3 | Nominal specific enthalpy at shell side |
| Real | yps_liq_nom | level_rel_start | Relative volume of liquid phase at nominal point |
| Shell Side › Initialisation | |||
| SI.EnthalpyMassSpecific | h_liq_start | -10 + TILMedia.VLEFluid.MixtureCompatible.Functions.bubbleSpecificEnthalpy_pxi(medium_shell, p_start_shell) | Start value of liquid specific enthalpy |
| SI.EnthalpyMassSpecific | h_vap_start | +10 + TILMedia.VLEFluid.MixtureCompatible.Functions.dewSpecificEnthalpy_pxi(medium_shell, p_start_shell) | Start value of vapour specific enthalpy |
| Basics.Units.Pressure | p_start_shell | 1e5 | Start value of shell fluid pressure |
| Real | level_rel_start | 0.5 | Start value for relative filling Level |
| Integer | initOptionShell | 211 | Type of initialisation |
| Tubes › Fundamental Definitions | |||
| TILMedia.VLEFluid.Types.BaseVLEFluid | medium_tubes | simCenter.fluid1 | Medium to be used for tubes |
| Tubes › Geometry | |||
| ClaRa.Basics.Units.Length | diameter_i | 0.048 | Inner diameter of horizontal tubes |
| ClaRa.Basics.Units.Length | diameter_o | 0.05 | Outer diameter of horizontal tubes |
| ClaRa.Basics.Units.Length | length_tubes | 10 | Length of the tubes (one pass) |
| Integer | N_tubes | 1000 | Number of horizontal tubes |
| Integer | N_passes | 1 | Number of passes of the internal tubes |
| ClaRa.Basics.Units.Length | z_in_tubes | length/2 | Inlet position from bottom |
| ClaRa.Basics.Units.Length | z_out_tubes | length/2 | Outlet position from bottom |
| Boolean | staggeredAlignment | true | True, if the tubes are aligned staggeredly, false otherwise |
| ClaRa.Basics.Units.Length | Delta_z_par | 2*diameter_o | Distance between tubes parallel to flow direction (center to center) |
| ClaRa.Basics.Units.Length | Delta_z_ort | 2*diameter_o | Distance between tubes orthogonal to flow direction (center to center) |
| Integer | N_rows | integer(ceil(sqrt(N_tubes))*N_passes) | Number of pipe rows in flow direction |
| Real | CF_geo | 1 | Correction coefficient due to fins etc. |
| Tubes › Nominal Values | |||
| ClaRa.Basics.Units.MassFlowRate | m_flow_nom_tubes | 10 | Nominal mass flow on tube side |
| ClaRa.Basics.Units.Pressure | p_nom_tubes | 10 | Nominal pressure on tube side |
| ClaRa.Basics.Units.EnthalpyMassSpecific | h_nom_tubes | 10 | Nominal specific enthalpy on tube side |
| ClaRa.Basics.Units.HeatFlowRate | Q_flow_nom | 1e6 | Nominal heat flow rate |
| Tubes › Initialisation | |||
| ClaRa.Basics.Units.EnthalpyMassSpecific | h_start_tubes | 1e5 | Start value of tube fluid specific enthalpy |
| ClaRa.Basics.Units.Pressure | p_start_tubes | 1e5 | Start value of tube fluid pressure |
| Integer | initOptionTubes | 0 | Type of initialisation at tube side |
| Tube Wall › Initialisation | |||
| Basics.Units.Temperature[3] | T_w_i_start | ones(3)*293.15 | Initial temperature at inner phase |
| Basics.Units.Temperature[3] | T_w_o_start | ones(3)*293.15 | Initial temperature at outer phase |
| Integer | initOptionWall | 0 | Init Option of Wall |
| Integer | initOption_yps | 3 | Volumetric initialisation |
| Real[2] | yps_start | {0.33, 0.33} | Initial area fraction 1phase | 2phase |
| Expert Settings › Inter-Phase Heat and Mass Transfer at Shell Side | |||
| Boolean | equalPressures | true | True if pressure in liquid and vapour phase is equal |
| Expert Settings › Mass Accumulation at Shell Side | |||
| Modelica.Blocks.Types.Smoothness | smoothness | Modelica.Blocks.Types.Smoothness.LinearSegments | Smoothness of level calculation (table based) |
| Summary and Visualisation | |||
| Boolean | levelOutput | false | True, if Real level connector shall be addded |
| Boolean | outputAbs | false | True, if absolute level is at output |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.FluidPortIn | In2 | ||
| ClaRa.Basics.Interfaces.FluidPortOut | Out2 | ||
| ClaRa.Basics.Interfaces.FluidPortOut | Out1 | ||
| ClaRa.Basics.Interfaces.FluidPortIn | In1 | ||
| Basics.Interfaces.EyeOut | eye2 | ||
| Basics.Interfaces.EyeOut | eye1 | ||
| Basics.Interfaces.FluidPortIn | aux1 | ||
| Basics.Interfaces.FluidPortIn | aux2 | ||
| Modelica.Blocks.Interfaces.RealOutput | level | if outputAbs then shell.summary.outline.level_abs else shell.summary.outline.level_rel |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| String | complexity (from ComplexityLevel) | "??" | |
| ClaRa.SimCenter | simCenter | ||
| Basics.ControlVolumes.FluidVolumes.VolumeVLE_L2 | tubes | ||
| Basics.ControlVolumes.FluidVolumes.VolumeVLE_L3_TwoZonesNPort | shell | ||
| ClaRa.Basics.ControlVolumes.SolidVolumes.NTU_L3_standalone | wall | {shell.heattransfer.alpha[2],shell.heattransfer.alpha[2],shell.heattransfer.alpha[1]} | |
| Summary | summary | ||
| Adapters.Scalar2VectorHeatPort | reallocateHeatFlows |
Contents
| Name | Description |
|---|---|
 Outline | |
 Summary | |
 HeatTransfer_Shell | |
 PressureLossShell | |
| HeatTransferTubes | |
| PressureLossTubes | |
 WallMaterial | |
| HeatCapacityAveraging |
Revisions
For revisions please consult the html-documentation shipped with ClaRa.