modelNTU_plate_L3
Base heat exchanger wall model with liquid, vapour and 2ph zones for plate geometry
Extends from ClaRa.Basics.Icons.NTU, 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:
ClaRa development team, Copyright © 2017 - 2022.References:
For references please consult the html-documentation shipped with ClaRa.
Remarks:
This component was developed for ClaRa library.
Acknowledgements:
CLA:
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.ThermalResistance | HR_nom | thickness_wall/(solid[1].lambda_nominal*A_heat) | Nominal conductive heat resistance |
| ClaRa.Basics.Units.Temperature[3] | T_w_i_start | ones(3)*293.15 | |Initialisation||Initial temperature at inner phase |
| ClaRa.Basics.Units.Temperature[3] | T_w_o_start | ones(3)*293.15 | |Initialisation||Initial temperature at outer phase |
| Real | gain_eff | 1 | |Expert Settings||Avoid effectiveness > 1, high gain_eff leads to stricter observation but may cause numeric errors |
| ClaRa.Basics.Units.Time | Tau_stab | 0.1 | |Expert Settings||Time constant for state stabilisation |
| Boolean | showExpertSummary | false | |Summaries and Visualisation||True,if expert summaries shall be shown |
| Fundamental Definitions | |||
| TILMedia.VLEFluid.Types.BaseVLEFluid | medium_shell | simCenter.fluid1 | Medium of shell side |
| TILMedia.VLEFluid.Types.BaseVLEFluid | medium_tubes | simCenter.fluid1 | Medium of tubes side |
| Boolean | outerPhaseChange | true | True, if phase change may occur at outer side |
| Geometry | |||
| ClaRa.Basics.Units.Length | width | 1 | Plate width |
| ClaRa.Basics.Units.Length | length | 1 | Plate length |
| ClaRa.Basics.Units.Length | thickness_wall | 0.001 | Wall thickness |
| Integer | N_plates | 3 | Number of tubes in parallel |
| Real | mass_struc | 0 | Mass of inner structure elements, additional to the tubes itself |
| Real | CF_geo | 1 | Correction coefficient due to fins etc. |
| ClaRa.Basics.Units.Area | A_heat | (N_plates - 2)*width*length | Mean area of heat transfer |
| Initialisation | |||
| Integer | initOption | 0 | Type of initialisation |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.HeatPort_a[3] | outerPhase | outer side of cylinder | |
| ClaRa.Basics.Interfaces.HeatPort_a[3] | innerPhase | inner side of cylinder |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| String | complexity (from ComplexityLevel) | "??" | |
| ClaRa.SimCenter | simCenter | ||
| ClaRa.Basics.Units.Mass | mass | Total mass of HEX | |
| ClaRa.Basics.Units.Pressure | p_o | Pressure at outer side | |
| ClaRa.Basics.Units.Pressure | p_i | Pressure at inner side | |
| ClaRa.Basics.Units.EnthalpyMassSpecific | h_i_inlet | Inlet temperature of inner flow | |
| ClaRa.Basics.Units.EnthalpyMassSpecific | h_o_inlet | Inlet temperature of outer flow | |
| ClaRa.Basics.Units.MassFlowRate | m_flow_i | Mass flow rate of inner side | |
| ClaRa.Basics.Units.MassFlowRate | m_flow_o | Mass flow rate of outer side | |
| ClaRa.Basics.Units.MassFraction[medium_tubes.nc - 1] | xi_i | Mass fraction at outer side | |
| ClaRa.Basics.Units.MassFraction[medium_shell.nc - 1] | xi_o | Mass fraction at outer side | |
| ClaRa.Basics.Units.CoefficientOfHeatTransfer[3] | alpha_i | Coefficient of heatTransfer for inner side for regions |1|2|3| | |
| ClaRa.Basics.Units.CoefficientOfHeatTransfer[3] | alpha_o | Coefficient of heatTransfer for outer side for regions |1|2|3| | |
| ClaRa.Basics.Units.AreaFraction | yps_1ph | Area fraction of zone A | |
| ClaRa.Basics.Units.AreaFraction | yps_2ph | Area fraction of zone B | |
| ClaRa.Basics.Units.HeatCapacityFlowRate[3] | kA | The product U*S for regions |1|2|3| | |
| ClaRa.Basics.Units.HeatFlowRate[3] | Q_flow | Heat flow rate of zones |1|2|3| | |
| HeatExchangerType | HEXtype | ||
| HeatCapacityAveraging | heatCapacityAveraging | ||
| Real[3] | cp_error_ | Check: Deviation from constant cp in zones |1|2|3| | |
| Real[3] | effectiveness_act | Actual effectiveness of zones |1|2|3| | |
| Real[3] | effectiveness | Effectiveness of zones |1|2|3| | |
| Real[3] | NTU_1 | Number of transfer units in zones |1|2|3| | |
| Real[3] | NTU_ctr | Number of transfer units in zones |1|2|3| for pure counter flow | |
| Real[3] | C_flow_low | Lower heat capacity flow in zones |1|2|3| | |
| Real[3] | C_flow_high | Higher heat capacity flow in zones |1|2|3| | |
| ClaRa.Basics.Units.HeatCapacityMassSpecific[3] | cp_o | ||
| ClaRa.Basics.Units.HeatCapacityMassSpecific[3] | cp_i | ||
| ClaRa.Basics.Units.ThermalResistance | HR | Conductive heat resistance | |
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | O1_in | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | O3_out | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | I1_out | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | O2_in | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | I2_out | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | I3_in | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | O2_out | ||
| TILMedia.VLEFluid.MixtureCompatible.VLEFluid_ph | I2_in | ||
| TILMedia.Solid.Solid[3] | solid | ||
| Summary | summary | ||
| ClaRa.Basics.ControlVolumes.SolidVolumes.Fundamentals.ICom_NTU_L3 | iCom |
Contents
| Name | Description |
|---|---|
 Material | |
 HeatExchangerType | |
| HeatCapacityAveraging | |
 Summary | |
 ECom |
Revisions
For revisions please consult the html-documentation shipped with ClaRa.