modelNTU_L2
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:
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 |
|---|---|---|---|
| Units.Mass | mass | mass_struc + solid.d*N_t*N_p*length*Modelica.Constants.pi*(radius_o^2 - radius_i^2) | Total mass of HEX |
| Units.Area | A_heat_m | (A_heat_o - A_heat_i)/log(A_heat_o/A_heat_i) | Mean area of heat transfer |
| Units.Area | A_heat_i | 2*Modelica.Constants.pi*radius_i*length*N_t*N_p | Area of heat transfer at inner phase |
| Units.Area | A_heat_o | 2*Modelica.Constants.pi*radius_o*length*N_t*N_p | Area of heat transfer at oter phase |
| Units.ThermalResistance | HR_nom | (radius_o - radius_i)/(solid.lambda_nominal*A_heat_m) | Nominal conductive heat resistance |
| Boolean | showExpertSummary | false | |Summary and Visualisation||True, if expert summary should be applied |
| Geometry | |||
| Integer | N_t | 1 | Number of tubes in one pass |
| Integer | N_p | 1 | Number of passes |
| Units.Length | length | Tube length (for one pass) | |
| Units.Length | radius_i | Inner radius of tube | |
| Units.Length | radius_o | Outer radius of tube | |
| Units.Mass | mass_struc | 0 | Mass of inner structure elements, additional to the tubes itself |
| Integer | stateLocation | 1 | Location of the states |
| Initialisation | |||
| Units.Temperature | T_w_i_start | 293.15 | Initial temperature at inner phase |
| Units.Temperature | T_w_a_start | 293.15 | Initial temperature at outer phase |
| Integer | initOption | 0 | Type of initialisation |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.HeatPort_a | outerPhase | outer side of cylinder | |
| ClaRa.Basics.Interfaces.HeatPort_a | innerPhase | inner side of cylinder |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.SimCenter | simCenter | ||
| String | complexity (from ComplexityLevel) | "??" | |
| Real | CF_geo | 1 | Correction coefficient due to fins etc. |
| Units.Temperature | T_i_in | Inlet temperature of inner flow | |
| Units.Temperature | T_a_in | Inlet temperature of outer flow | |
| Units.MassFlowRate | m_flow_i | Mass flow rate of inner side | |
| Units.MassFlowRate | m_flow_a | Mass flow rate of outer side | |
| Units.CoefficientOfHeatTransfer | alpha_i | Coefficient of heatTransfer for inner side | |
| Units.CoefficientOfHeatTransfer | alpha_o | Coefficient of heatTransfer for outer side | |
| Units.HeatCapacityMassSpecific | cp_mean_i | Mean cp of inner flow | |
| Units.HeatCapacityMassSpecific | cp_mean_a | Mean cp of outer flow | |
| Units.Temperature | T_i_out | Outlet temperature of steady state inner flow | |
| Units.Temperature | T_a_out | Outlet temperature of steady state outer flow | |
| Units.HeatFlowRate | Q_flow_NTU_1 | Steady state heat flow rate outer to inner phase | |
| Units.HeatCapacityFlowRate | kA | The product heat transmission coefficient and heat transfer area | |
| Real | effectiveness | Heat exchanger efficiency | |
| Units.ThermalResistance | HR | Conductive heat resistance | |
| TILMedia.Solid.Solid | solid | ||
| HeatExchangerType | heatExchangerType | ||
| Summary | summary |
Contents
| Name | Description |
|---|---|
 Material | |
 HeatExchangerType | |
 Summary |
Revisions
For revisions please consult the html-documentation shipped with ClaRa.