modelDirectStation
Extends from BaseClasses.BaseStation.
Information
This is a model for an direct district heating substation. It is directly connects the primary side with the secondary side. It is basically only used as placeholder and to simplify compatibility issues.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Assumptions | |||
| Boolean | allowFlowReversal1 (from PartialFourPort) | true | = false to simplify equations, assuming, but not enforcing, no flow reversal for medium 1 |
| Boolean | allowFlowReversal2 (from PartialFourPort) | true | = false to simplify equations, assuming, but not enforcing, no flow reversal for medium 2 |
| Nominal condition | |||
| Modelica.SIunits.MassFlowRate | m1_flow_nominal (from PartialFourPortInterface) | Nominal mass flow rate | |
| Modelica.SIunits.MassFlowRate | m2_flow_nominal (from PartialFourPortInterface) | Nominal mass flow rate | |
| Advanced | |||
| Medium1.MassFlowRate | m1_flow_small (from PartialFourPortInterface) | 1E-4*abs(m1_flow_nominal) | Small mass flow rate for regularization of zero flow |
| Medium2.MassFlowRate | m2_flow_small (from PartialFourPortInterface) | 1E-4*abs(m2_flow_nominal) | Small mass flow rate for regularization of zero flow |
| Advanced › Diagnostics | |||
| Boolean | show_T (from PartialFourPortInterface) | false | = true, if actual temperature at port is computed |
| Flow resistance › Primary side | |||
| Boolean | from_dp (from BaseStation) | false | = true, use m_flow = f(dp) else dp = f(m_flow) |
| Boolean | linearizeFlowResistance (from BaseStation) | false | = true, use linear relation between m_flow and dp for any flow rate |
| Primary side | |||
| Modelica.SIunits.Power | Q1_flow_nominal (from BaseStation) | m1_flow_nominal*(TemSup1_nominal - TemRet1_nominal)*cp_default | Nominal heat flow rate at primary side |
| Modelica.SIunits.Temperature | TemSup1_nominal (from BaseStation) | 80.0 + 273.15 | Nominal supply temperature |
| Modelica.SIunits.Temperature | TemRet1_nominal (from BaseStation) | 45.0 + 273.15 | Nominal return temperature |
| Modelica.SIunits.PressureDifference | dp1_nominal (from BaseStation) | Nominal pressure difference | |
| Secondary side | |||
| Modelica.SIunits.Power | Q2_flow_nominal (from BaseStation) | m2_flow_nominal*(TemSup2_nominal - TemRet2_nominal)*cp_default | Nominal heat flow rate at primary side |
| Modelica.SIunits.Temperature | TemSup2_nominal (from BaseStation) | 60.0 + 273.15 | Nominal supply temperature |
| Modelica.SIunits.Temperature | TemRet2_nominal (from BaseStation) | 35.0 + 273.15 | Nominal return temperature |
| Boolean | OutsideDependent (from BaseStation) | false | Outside temperature dependent secondary supply temperature |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.FluidPort_a | port_a1 (from PartialFourPort) | Fluid connector a1 (positive design flow direction is from port_a1 to port_b1) | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_b1 (from PartialFourPort) | Fluid connector b1 (positive design flow direction is from port_a1 to port_b1) | |
| Modelica.Fluid.Interfaces.FluidPort_a | port_a2 (from PartialFourPort) | Fluid connector a2 (positive design flow direction is from port_a2 to port_b2) | |
| Modelica.Fluid.Interfaces.FluidPort_b | port_b2 (from PartialFourPort) | Fluid connector b2 (positive design flow direction is from port_a2 to port_b2) | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_ht (from BaseStation) | Outside temperature port | |
| Modelica.Blocks.Interfaces.RealOutput | P (from BaseStation) | Electric power |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium1.MassFlowRate | m1_flow (from PartialFourPortInterface) | port_a1.m_flow | Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) |
| Modelica.SIunits.PressureDifference | dp1 (from PartialFourPortInterface) | port_a1.p - port_b1.p | Pressure difference between port_a1 and port_b1 |
| Medium2.MassFlowRate | m2_flow (from PartialFourPortInterface) | port_a2.m_flow | Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) |
| Modelica.SIunits.PressureDifference | dp2 (from PartialFourPortInterface) | port_a2.p - port_b2.p | Pressure difference between port_a2 and port_b2 |
| Medium1.ThermodynamicState | sta_a1 (from PartialFourPortInterface) | Medium1.setState_phX(port_a1.p, noEvent(actualStream(port_a1.h_outflow)), noEvent(actualStream(port_a1.Xi_outflow))) | Medium properties in port_a1 |
| Medium1.ThermodynamicState | sta_b1 (from PartialFourPortInterface) | Medium1.setState_phX(port_b1.p, noEvent(actualStream(port_b1.h_outflow)), noEvent(actualStream(port_b1.Xi_outflow))) | Medium properties in port_b1 |
| Medium2.ThermodynamicState | sta_a2 (from PartialFourPortInterface) | Medium2.setState_phX(port_a2.p, noEvent(actualStream(port_a2.h_outflow)), noEvent(actualStream(port_a2.Xi_outflow))) | Medium properties in port_a2 |
| Medium2.ThermodynamicState | sta_b2 (from PartialFourPortInterface) | Medium2.setState_phX(port_b2.p, noEvent(actualStream(port_b2.h_outflow)), noEvent(actualStream(port_b2.Xi_outflow))) | Medium properties in port_b2 |
| Modelica.Blocks.Sources.RealExpression | total_power (from BaseStation) | sum of all power consumption/generation in component |