modelHeatflow_L2
Heat flow boundary with prescribed power and given volume (L2)
Extends from TransiEnt.Components.Boundaries.Heat.Base.PartialHeatBoundary.
Information
1. Purpose of model
Boundary with L2 Heat exchanger from ClaRa
2. Level of detail, physical effects considered, and physical insight
L2 (defined in the CodingConventions)
3. Limits of validity
(no remarks)
4. Interfaces
TransiEnt.Base.Interfaces.Thermal.FluidPortIn (x2)
RealInput (for specification of boundary power)
5. Nomenclature
(no elements)
6. Governing Equations
(no remarks)
7. Remarks for Usage
(no remarks)
8. Validation
(no remarks)
9. References
(no remarks)
10. Version History
Model created by Arne Koeppen / Lisa Andresen (andresen@tuhh.de), Jul 2013
Refactoring after new boundary / consumer concept by Pascal Dubucq (dubucq@tuhh.de) on Mon Aug 18 2014
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| TILMedia.VLEFluidTypes.BaseVLEFluid | Medium (from PartialHeatBoundary) | simCenter.fluid1 | Medium model |
| SI.Power | Q_flow_n | 100e3 | |Heat demand|Nominal heating power |
| Boolean | use_Q_flow_in | true | |Heat demand|Use external value for Q_flow |
| Boolean | change_sign | false | Change sign on input value (false: setpoint < 0 means producing heat) |
| SI.Power | Q_flow_const | 100e3 | |Heat demand|Constant heating power |
| SI.MassFlowRate | m_flow_nom | simCenter.m_flow_nom | |Heat exchanger|Nominal mass flow rate |
| ClaRa.Basics.Units.EnthalpyMassSpecific | h_nom | 1e5 | |Heat exchanger|Nominal specific enthalpy |
| SI.HeatCapacity | C | 1e9 | |Heat exchanger|Heat capacity (geometry is calculated by this value) |
| SI.Temperature | T_start | 323.15 | |Heat exchanger|Initial temperature |
| Integer | initOption | 0 | |Heat exchanger|Type of initialisation |
| Real | valveAuthority | 0.6 | |Valve|Valve authority |
| SI.Pressure | Delta_p_nom | simCenter.p_nom[2] - simCenter.p_nom[1] | |Valve|Nominal pressure drop |
| Heat exchanger | |||
| SI.Pressure | p_nom | simCenter.p_nom[1] | Nominal pressure |
| SI.Pressure | p_start | simCenter.p_nom[1] | Start value of system pressure |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.Basics.Interfaces.Thermal.FluidPortOut | fluidPortOut (from PartialHeatBoundary) | ||
| TransiEnt.Basics.Interfaces.Thermal.FluidPortIn | fluidPortIn (from PartialHeatBoundary) | ||
| TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateIn | Q_flow_prescribed | RealInput (for specification of boundary power) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.SimCenter | simCenter (from PartialHeatBoundary) | ||
| Modelica.Units.SI.HeatFlowRate | Q_flow_boundary (from PartialHeatBoundary) | fluidPortIn.m_flow*(actualStream(fluidPortIn.h_outflow) - actualStream(fluidPortOut.h_outflow)) | |
| ClaRa.Components.HeatExchangers.IdealShell_L2 | heatExchanger | ||
| Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow | heatDemand | ||
| ClaRa.Components.VolumesValvesFittings.Valves.GenericValveVLE_L1 | controlValve | ||
| Modelica.Blocks.Math.Gain | normalizer | ||
| Modelica.Blocks.Math.Gain | signChanger |
Contents
| Name | Description |
|---|---|
 PressureLoss |