modelDynamicHX
Simple dynamic heat exchanger model
Extends from Interfaces.FourPortHeatExchanger.
Information
This is a simple dynamic heat exchanger with a heat capacity and convection. The heat exchanger is discretized in n elements and the volume elements are replaceable.
The heat transfer and pressure losses are calculated by nominal values. Nevertheless, the heat transfer coefficient Gc can be overwritten.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Dynamics › Nominal condition | |||
| Modelica.Units.SI.Time | tau_C | 10 | Time constant of heat capacity at nominal heat flow and temperature difference. |
| Heat Transfer | |||
| Modelica.Units.SI.TemperatureDifference | dT_nom | Temperature difference at nominal conditions (used to calculate Gc) | |
| Modelica.Units.SI.HeatFlowRate | Q_nom | Temperature difference at nominal conditions (used to calculate Gc) | |
| Modelica.Units.SI.ThermalConductance | Gc1 | Q_nom/dT_nom*2/nNodes | Signal representing the convective thermal conductance in [W/K] |
| Modelica.Units.SI.ThermalConductance | Gc2 | Q_nom/dT_nom*2/nNodes | Signal representing the convective thermal conductance in [W/K] |
| Initialization › Heat capacity | |||
| Modelica.Units.SI.Temperature | TCapacity_start | (T1_start + T2_start)/2 | Start value of temperature |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Components.HeatCapacitor[nNodes] | heatCapacitor | ||
| Modelica.Blocks.Sources.RealExpression[nNodes] | Gc1_Expression | ||
| Modelica.Thermal.HeatTransfer.Components.Convection[nNodes] | convection1 | ||
| Modelica.Blocks.Sources.RealExpression[nNodes] | Gc2_Expression | ||
| Modelica.Thermal.HeatTransfer.Components.Convection[nNodes] | convection2 |
Revisions
- December 12, 2018, by Alexander Kümpel:
First implementation, AixLib, issue 661.