modelCentral
Extends from BuildingSystems.Technologies.DistrictHeatingNetworks.EnergyProductionUnits.BaseClasses.PartialCentral.
Information
The central acts as endless power central unit. A huge mass flow at a set temperature T flows in order to ensure a supply temperature close to this temperature T.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.MassFlowRate | mProduction_flow_nominal (from PartialCentral) | Nominal mass flow rate | |
| Modelica.Units.SI.MassFlowRate | mDHN_flow_nominal (from PartialCentral) | Nominal mass flow rate | |
| Modelica.Units.SI.Pressure | dpProduction_nominal (from PartialCentral) | ||
| Modelica.Units.SI.Pressure | dpDHN_nominal (from PartialCentral) | ||
| Real | eps (from PartialCentral) | 0.8 | Heat exchanger effectiveness |
| Modelica.Media.Interfaces.Types.Temperature | T | 273.15 + 95 | Production temperature, value close to DHN supply temperature |
| Assumptions | |||
| Boolean | allowFlowReversal (from PartialTwoPort) | true | = false to simplify equations, assuming, but not enforcing, no flow reversal |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | m_flow_nominal (from PartialTwoPortInterface) | Nominal mass flow rate | |
| Advanced | |||
| Modelica.Units.SI.MassFlowRate | m_flow_small (from PartialTwoPortInterface) | 1E-4*abs(m_flow_nominal) | Small mass flow rate for regularization of zero flow |
| Advanced › Diagnostics | |||
| Boolean | show_T (from PartialTwoPortInterface) | false | = true, if actual temperature at port is computed |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_a | port_a (from PartialTwoPort) | Fluid connector a (positive design flow direction is from port_a to port_b) | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_b (from PartialTwoPort) | Fluid connector b (positive design flow direction is from port_a to port_b) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.MassFlowRate | m_flow (from PartialTwoPortInterface) | port_a.m_flow | Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) |
| Modelica.Units.SI.PressureDifference | dp (from PartialTwoPortInterface) | port_a.p - port_b.p | Pressure difference between port_a and port_b |
| Medium.ThermodynamicState | sta_a (from PartialTwoPortInterface) | if allowFlowReversal then Medium.setState_phX(port_a.p, noEvent(actualStream(port_a.h_outflow)), noEvent(actualStream(port_a.Xi_outflow))) else Medium.setState_phX(port_a.p, noEvent(inStream(port_a.h_outflow)), noEvent(inStream(port_a.Xi_outflow))) | Medium properties in port_a |
| Medium.ThermodynamicState | sta_b (from PartialTwoPortInterface) | if allowFlowReversal then Medium.setState_phX(port_b.p, noEvent(actualStream(port_b.h_outflow)), noEvent(actualStream(port_b.Xi_outflow))) else Medium.setState_phX(port_b.p, noEvent(port_b.h_outflow), noEvent(port_b.Xi_outflow)) | Medium properties in port_b |
| BuildingSystems.Fluid.HeatExchangers.ConstantEffectiveness | hex (from PartialCentral) | ||
| Fluid.Sources.MassFlowSource_T | source | ||
| BuildingSystems.Fluid.Sources.Boundary_pT | bou |