modelHeatTransfer_EN442
Extends from ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Generic_HT.HeatTransfer_L2 ( L2 || HT-BaseClass), ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.TubeTypeVLE_L2 (Partial heat transfer model for tube-type models), ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.ShellTypeVLE_L2 (Partial heat transfer model for shell-type models).
Information
1. Purpose of model
Model for Heat Transfer according to DIN EN 442-2.
2. Level of detail, physical effects considered, and physical insight
A detailed description of the calculation can be find in DIN EN 442-2.
3. Limits of validity
(Description)
4. Interfaces
(none)
5. Nomenclature
UA...Constant of Modell
n...Exponent according to 442-2
6. Governing Equations
Q_flow = UA* ∆T^n
7. Remarks for Usage
(none)
8. Validation
(no validation or testing necessary)
9. References
DIN EN 442-2:2014 - Radiatoren und Konvektoren Beuth Verlag, Berlin,2014.
10. Version History
Model created by Anne Senkel (anne.senkel@tuhh.de), January 2020
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| String | gas (from HeatTransferBaseGas) | "true" | |
| String | vle (from HeatTransferBaseVLE) | "true" | |
| String | liquid (from HeatTransferBaseLiquid) | "true" | |
| Boolean | useHomotopy (from HeatTransfer_L2) | ||
| String | tube (from TubeTypeVLE_L2) | "true" | |
| String | shell (from ShellTypeVLE_L2) | "true" | |
| Real | n | 1/3 | Exponent for Radiators according to EN4442_2 |
| Modelica.Units.SI.Temperature | T_mean_supply | 273.15 + 60 | |
| Modelica.Units.SI.TemperatureDifference | DT_nom | 20 | |
| Modelica.Units.SI.HeatFlowRate | Q_flow_nom | 500 | |
| Modelica.Units.SI.Temperature | T_air_nom | 295.15 | |
| Modelica.Units.SI.TemperatureDifference | Delta_T_mean_n | ((T_mean_supply - DT_nom) - T_air_nom)^n | |
| Real | UA | Q_flow_nom/Delta_T_mean_n | UA value at nominal condition |
| Integer | heatSurfaceAlloc | 1 | To be considered heat transfer area |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.HeatPort_a | heat (from HeatTransfer_L2) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Records.IComBase_L2 | iCom | ||
| ClaRa.Basics.ControlVolumes.Fundamentals.Geometry.GenericGeometry | geo |