Buildings.Templates.Components.Data
Records for design and operating parameters
Information
This package provides records for design and operating parameters.
Extends from Modelica.Icons.MaterialPropertiesPackage (Icon for package containing property classes).
Package Content
| Name | Description |
|---|---|
 Coil
|
Record for coil model |
| Damper
|
Record for damper model |
| Fan
|
Record for fan model |
| HeatPump
|
Record for heat pump model |
| PumpMultiple
|
Record for multiple-pump models |
| PumpSingle
|
Record for single pump model |
| Valve
|
Record for valve model |
Buildings.Templates.Components.Data.Coil
Record for coil model
Information
This record provides the set of sizing parameters for the classes within Buildings.Templates.Components.Coils.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Carrier_Centurion_50PG06 | datCoi | redeclare parameter Building... | Performance data record of evaporator coil |
| Configuration | |||
| Coil | typ | Equipment type | |
| Valve | typVal | Type of valve | |
| Boolean | have_sou | Set to true for fluid ports on the source side | |
| Nominal condition | |||
| MassFlowRate | mAir_flow_nominal | Air mass flow rate [kg/s] | |
| PressureDifference | dpAir_nominal | Air pressure drop [Pa] | |
| MassFlowRate | mWat_flow_nominal | Liquid mass flow rate [kg/s] | |
| PressureDifference | dpWat_nominal | Liquid pressure drop across coil [Pa] | |
| PressureDifference | dpValve_nominal | Liquid pressure drop across fully open valve [Pa] | |
| HeatFlowRate | cap_nominal | Coil capacity [W] | |
| Temperature | TWatEnt_nominal | Nominal entering liquid temperature [K] | |
| Temperature | TAirEnt_nominal | Nominal entering air temperature [K] | |
| MassFraction | wAirEnt_nominal | Nominal entering air humidity ratio [1] | |
Modelica definition
record Coil "Record for coil model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Coil typ
"Equipment type";
parameter Buildings.Templates.Components.Types.Valve typVal
"Type of valve";
parameter Boolean have_sou
"Set to true for fluid ports on the source side";
/*
For evaporator coils this is also provided by the performance data record.
The coil model shall generate a warning in case the design value exceeds
the maximum value from the performance data record.
*/
parameter Modelica.Units.SI.MassFlowRate mAir_flow_nominal(
final min=0,
start=if typ==Buildings.Templates.Components.Types.Coil.EvaporatorMultiStage or
typ==Buildings.Templates.Components.Types.Coil.EvaporatorVariableSpeed then
datCoi.sta[datCoi.nSta].nomVal.m_flow_nominal
else 1)
"Air mass flow rate";
parameter Modelica.Units.SI.PressureDifference dpAir_nominal(
final min=0,
displayUnit="Pa",
start=if typ==Buildings.Templates.Components.Types.Coil.None then 0 else
100)
"Air pressure drop";
parameter Modelica.Units.SI.MassFlowRate mWat_flow_nominal(
final min=0,
start=if typ==Buildings.Templates.Components.Types.Coil.WaterBasedHeating then
Q_flow_nominal / 4186 / 10 elseif
typ==Buildings.Templates.Components.Types.Coil.WaterBasedCooling then
-Q_flow_nominal / 4186 / 5 else
0)
"Liquid mass flow rate";
parameter Modelica.Units.SI.PressureDifference dpWat_nominal(
final min=0,
displayUnit="Pa",
start=if typ==Buildings.Templates.Components.Types.Coil.WaterBasedHeating then
0.5e4 elseif typ==Buildings.Templates.Components.Types.Coil.WaterBasedCooling then
3e4 else
0)
"Liquid pressure drop across coil";
parameter Modelica.Units.SI.PressureDifference dpValve_nominal(
final min=0,
displayUnit="Pa",
start=if typVal==Buildings.Templates.Components.Types.Valve.None then 0
else dpWat_nominal / 2)
"Liquid pressure drop across fully open valve";
parameter Modelica.Units.SI.HeatFlowRate cap_nominal(
start=if typ==Buildings.Templates.Components.Types.Coil.None then 0
elseif typ==Buildings.Templates.Components.Types.Coil.EvaporatorMultiStage or
typ==Buildings.Templates.Components.Types.Coil.EvaporatorVariableSpeed then
datCoi.sta[datCoi.nSta].nomVal.Q_flow_nominal
elseif typ==Buildings.Templates.Components.Types.Coil.WaterBasedCooling then -1E4
else 1E4)
"Coil capacity";
/*
For evaporator coils this is also provided by the performance data record.
The coil model shall generate a warning in case the design value exceeds
the maximum value from the performance data record.
*/
final parameter Modelica.Units.SI.HeatFlowRate Q_flow_nominal=
if typ==Buildings.Templates.Components.Types.Coil.WaterBasedHeating or
typ==Buildings.Templates.Components.Types.Coil.ElectricHeating then abs(cap_nominal)
else -1 * abs(cap_nominal)
"Nominal heat flow rate";
parameter Modelica.Units.SI.Temperature TWatEnt_nominal(
final min=273.15,
displayUnit="degC",
start=if typ==Buildings.Templates.Components.Types.Coil.WaterBasedHeating then 50+273.15
elseif typ==Buildings.Templates.Components.Types.Coil.WaterBasedCooling then 7+273.15
else 273.15)
"Nominal entering liquid temperature";
parameter Modelica.Units.SI.Temperature TAirEnt_nominal(
final min=243.15,
displayUnit="degC",
start=if typ==Buildings.Templates.Components.Types.Coil.WaterBasedCooling then 30+273.15
else 273.15)
"Nominal entering air temperature";
parameter Modelica.Units.SI.MassFraction wAirEnt_nominal(
final min=0,
start=0.01)
"Nominal entering air humidity ratio";
replaceable parameter Buildings.Fluid.DXSystems.Cooling.AirSource.Data.SingleSpeed.Carrier_Centurion_50PG06
datCoi
constrainedby Buildings.Fluid.DXSystems.Cooling.AirSource.Data.Generic.DXCoil
"Performance data record of evaporator coil";
end Coil;
Buildings.Templates.Components.Data.Damper
Record for damper model
Information
This record provides the set of sizing parameters for the class Buildings.Templates.Components.Actuators.Damper.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Configuration | |||
| Damper | typ | Equipment type | |
| Mechanical | |||
| MassFlowRate | m_flow_nominal | Air mass flow rate [kg/s] | |
| PressureDifference | dp_nominal | Air pressure drop [Pa] | |
| PressureDifference | dpFixed_nominal | 0 | Air pressure drop of fixed elements in series with damper [Pa] |
Modelica definition
record Damper "Record for damper model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Damper typ
"Equipment type";
parameter Modelica.Units.SI.MassFlowRate m_flow_nominal(
final min=0,
start=1)
"Air mass flow rate";
parameter Modelica.Units.SI.PressureDifference dp_nominal(
final min=0,
displayUnit="Pa",
start=if typ==Buildings.Templates.Components.Types.Damper.None then 0
elseif typ==Buildings.Templates.Components.Types.Damper.PressureIndependent then 50
else 15)
"Air pressure drop";
parameter Modelica.Units.SI.PressureDifference dpFixed_nominal(
final min=0,
displayUnit="Pa")=0
"Air pressure drop of fixed elements in series with damper";
end Damper;
Buildings.Templates.Components.Data.Fan
Record for fan model
Information
This record provides the set of sizing parameters for the classes within Buildings.Templates.Components.Fans.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Generic | per | per(pressure(V_flow={0,1,2}*... | Performance data |
| Configuration | |||
| Fan | typ | Equipment type | |
| Integer | nFan | Number of fans | |
| Nominal condition | |||
| MassFlowRate | m_flow_nominal | Total air mass flow rate [kg/s] | |
| PressureDifference | dp_nominal | Total pressure rise [Pa] | |
Modelica definition
record Fan "Record for fan model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Fan typ
"Equipment type";
parameter Integer nFan(
final min=0,
start=if typ==Buildings.Templates.Components.Types.Fan.None then 0 else 1)
"Number of fans";
parameter Modelica.Units.SI.MassFlowRate m_flow_nominal(
final min=0,
start=1)
"Total air mass flow rate";
parameter Modelica.Units.SI.PressureDifference dp_nominal(
final min=0,
displayUnit="Pa",
start=if typ==Buildings.Templates.Components.Types.Fan.None then 1
else 500)
"Total pressure rise";
replaceable parameter Buildings.Fluid.Movers.Data.Generic per(
pressure(
V_flow={0, 1, 2} * m_flow_nominal / 1.2 / max(1, nFan),
dp={1.5, 1, 0} * dp_nominal))
constrainedby Buildings.Fluid.Movers.Data.Generic
"Performance data";
end Fan;
Buildings.Templates.Components.Data.HeatPump
Record for heat pump model
Information
This record provides the set of sizing and operating parameters for heat pump models that can be found within Buildings.Templates.Components.HeatPumps.
Performance data for the equation fit model
When using
typMod=Buildings.Templates.Components.Types.HeatPumpModel.EquationFit,
the design values declared at the top-level
are propagated by default to the performance data record per
under the assumption that the reference conditions used for assessing the
performance data match the design conditions.
This avoids duplicate parameter assignments when manually entering
the performance curve coefficients.
Note that this propagation does not persist when redeclaring or reassigning the record. This is because the equation fit method uses reference values that must match the ones used to compute the performance curve coefficients.
Also note that placeholders values are assigned to the performance curves,
the reference source temperature and the input power in
cooling mode to avoid assigning these parameters in case of non-reversible
heat pumps.
These values are unrealistic and must be overwritten for reversible heat pumps, which
is always the case when redeclaring or
reassigning the performance record per.
Models that use this record will issue a warning if these placeholders values
are not overwritten in case of reversible heat pumps.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Generic | perFit | perFit(dpHeaLoa_nominal=dpHe... | Performance data - Equation fit model |
| Configuration | |||
| HeatPump | typ | Equipment type | |
| Boolean | is_rev | Set to true for reversible heat pumps, false for heating only | |
| HeatPumpModel | typMod | Type of heat pump model | |
| SpecificHeatCapacity | cpHeaWat_default | Buildings.Utilities.Psychrom... | HW default specific heat capacity [J/(kg.K)] |
| SpecificHeatCapacity | cpSou_default | if typ == Buildings.Template... | Source fluid default specific heat capacity [J/(kg.K)] |
| Nominal condition | |||
| MassFlowRate | mHeaWat_flow_nominal | HW mass flow rate [kg/s] | |
| PressureDifference | dpHeaWat_nominal | Pressure drop at design HW mass flow rate [Pa] | |
| HeatFlowRate | capHea_nominal | Heating capacity [W] | |
| Temperature | THeaWatSup_nominal | (Highest) HW supply temperature [K] | |
| MassFlowRate | mChiWat_flow_nominal | CHW mass flow rate [kg/s] | |
| HeatFlowRate | capCoo_nominal | Cooling capacity [W] | |
| Temperature | TChiWatSup_nominal | (Lowest) CHW supply temperature [K] | |
| Temperature | TSouHea_nominal | OAT or source fluid supply temperature (evaporator entering) in heating mode [K] | |
| MassFlowRate | mSouWwHea_flow_nominal | Source fluid mass flow rate in heating mode [kg/s] | |
| PressureDifference | dpSouWwHea_nominal | Source fluid pressure drop in heating mode [Pa] | |
| Temperature | TSouCoo_nominal | OAT or source fluid supply temperature (condenser entering) in cooling mode [K] | |
| MassFlowRate | mSouWwCoo_flow_nominal | Source fluid mass flow rate in cooling mode [kg/s] | |
Modelica definition
record HeatPump "Record for heat pump model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.HeatPump typ
"Equipment type";
parameter Boolean is_rev
"Set to true for reversible heat pumps, false for heating only";
parameter Buildings.Templates.Components.Types.HeatPumpModel typMod
"Type of heat pump model";
// Default fluid properties
parameter Modelica.Units.SI.SpecificHeatCapacity cpHeaWat_default=
Buildings.Utilities.Psychrometrics.Constants.cpWatLiq
"HW default specific heat capacity";
/*
cpChiWat_default is for internal use only.
It is the same as cpChiWat_default for reversible HP.
Non-reversible HP that can be controlled to produce either HW or CHW
shall be modeled with chiller components (as a chiller/heater).
*/
final parameter Modelica.Units.SI.SpecificHeatCapacity cpChiWat_default=
cpHeaWat_default
"CHW default specific heat capacity";
parameter Modelica.Units.SI.SpecificHeatCapacity cpSou_default=
if typ==Buildings.Templates.Components.Types.HeatPump.AirToWater then
Buildings.Utilities.Psychrometrics.Constants.cpAir else
Buildings.Utilities.Psychrometrics.Constants.cpWatLiq
"Source fluid default specific heat capacity";
parameter Modelica.Units.SI.MassFlowRate mHeaWat_flow_nominal(
final min=0)
"HW mass flow rate";
parameter Modelica.Units.SI.PressureDifference dpHeaWat_nominal(
min=0,
start=Buildings.Templates.Data.Defaults.dpChiWatChi)
"Pressure drop at design HW mass flow rate";
parameter Modelica.Units.SI.HeatFlowRate capHea_nominal
"Heating capacity";
parameter Modelica.Units.SI.Temperature THeaWatSup_nominal(
final min=273.15)
"(Highest) HW supply temperature";
final parameter Modelica.Units.SI.Temperature THeaWatRet_nominal=
THeaWatSup_nominal-abs(capHea_nominal)/cpHeaWat_default/mHeaWat_flow_nominal
"HW return temperature";
parameter Modelica.Units.SI.MassFlowRate mChiWat_flow_nominal(
start=0,
final min=0)
"CHW mass flow rate";
final parameter Modelica.Units.SI.PressureDifference dpChiWat_nominal=
dpHeaWat_nominal * (mChiWat_flow_nominal/mHeaWat_flow_nominal)^2
"Pressure drop at design CHW mass flow rate";
parameter Modelica.Units.SI.HeatFlowRate capCoo_nominal(
start=0)
"Cooling capacity";
parameter Modelica.Units.SI.Temperature TChiWatSup_nominal(
start=Buildings.Templates.Data.Defaults.TChiWatSup,
final min=253.15)
"(Lowest) CHW supply temperature";
final parameter Modelica.Units.SI.Temperature TChiWatRet_nominal=
if is_rev then
TChiWatSup_nominal+abs(capCoo_nominal)/cpChiWat_default/mChiWat_flow_nominal
else Buildings.Templates.Data.Defaults.TChiWatRet
"CHW return temperature";
parameter Modelica.Units.SI.Temperature TSouHea_nominal(
start=Buildings.Templates.Data.Defaults.TOutHpHeaLow,
final min=220)
"OAT or source fluid supply temperature (evaporator entering) in heating mode";
parameter Modelica.Units.SI.MassFlowRate mSouWwHea_flow_nominal(
start=mHeaWat_flow_nominal,
final min=0)
"Source fluid mass flow rate in heating mode";
parameter Modelica.Units.SI.PressureDifference dpSouWwHea_nominal(
min=0,
start=Buildings.Templates.Data.Defaults.dpChiWatChi)
"Source fluid pressure drop in heating mode";
final parameter Modelica.Units.SI.MassFlowRate mSouHea_flow_nominal=
if typ==Buildings.Templates.Components.Types.HeatPump.WaterToWater then
mSouWwHea_flow_nominal else
Buildings.Templates.Data.Defaults.mAirFloByCapChi * abs(capHea_nominal)
"Source fluid mass flow rate in heating mode";
final parameter Modelica.Units.SI.PressureDifference dpSouHea_nominal=
if typ==Buildings.Templates.Components.Types.HeatPump.WaterToWater then
dpSouWwHea_nominal else Buildings.Templates.Data.Defaults.dpAirChi
"Source fluid pressure drop in heating mode";
parameter Modelica.Units.SI.Temperature TSouCoo_nominal(
start=Buildings.Templates.Data.Defaults.TOutHpCoo,
final min=273.15)
"OAT or source fluid supply temperature (condenser entering) in cooling mode";
parameter Modelica.Units.SI.MassFlowRate mSouWwCoo_flow_nominal(
start=mChiWat_flow_nominal,
final min=0)
"Source fluid mass flow rate in cooling mode";
final parameter Modelica.Units.SI.MassFlowRate mSouCoo_flow_nominal=
if typ==Buildings.Templates.Components.Types.HeatPump.WaterToWater then
mSouWwCoo_flow_nominal else
Buildings.Templates.Data.Defaults.mAirFloByCapChi * abs(capCoo_nominal)
"Source fluid mass flow rate in cooling mode";
final parameter Modelica.Units.SI.PressureDifference dpSouCoo_nominal=
dpSouHea_nominal * (mSouCoo_flow_nominal/mSouHea_flow_nominal)^2
"Source fluid pressure drop in cooling mode";
replaceable parameter Buildings.Fluid.HeatPumps.Data.EquationFitReversible.Generic
perFit(
dpHeaLoa_nominal=dpHeaWat_nominal,
dpHeaSou_nominal=dpSouHea_nominal,
hea(
Q_flow=abs(capHea_nominal),
P=0,
mLoa_flow=mHeaWat_flow_nominal,
mSou_flow=mSouHea_flow_nominal,
coeQ={1,0,0,0,0},
coeP={1,0,0,0,0},
TRefLoa=THeaWatRet_nominal,
TRefSou=TSouHea_nominal),
coo(
Q_flow=if is_rev then -abs(capCoo_nominal) else -1,
P=0,
mLoa_flow=mChiWat_flow_nominal,
mSou_flow=mSouCoo_flow_nominal,
coeQ={1,0,0,0,0},
coeP={1,0,0,0,0},
TRefLoa=TChiWatRet_nominal,
TRefSou=TSouCoo_nominal)) constrainedby Buildings.Fluid.HeatPumps.Data.EquationFitReversible.Generic
"Performance data - Equation fit model";
end HeatPump;
Buildings.Templates.Components.Data.PumpMultiple
Record for multiple-pump models
Information
This record provides the set of sizing and operating parameters for the multiple-pump model Buildings.Templates.Components.Pumps.Multiple.
A default flow characteristic is provided, which goes through the design operating point and spans over 0 and twice the design flow rate at maximum speed. This default characteristic is based on a least squares polynomial fit of the characteristics from Buildings.Fluid.Movers.Data.Pumps.Wilo. The user may refer to the documentation of Buildings.Fluid.HydronicConfigurations.UsersGuide.ModelParameters for further details. Note that a default medium density is used to parameterize the pump characteristic. So models that use this record should overwrite this default value with the density of the medium in use, especially in the case of a water/glycol mix.
In order to modify the default characteristic, one may use either of the following methods.
- Assign the whole subrecord
peror only its componentper.pressure. In this case the elementsper[i]may differ one from another. This is the recommended approach for unequally sized units such as dedicated pumps. - Redeclare the component
per. In this case the elementsper[i]are all equal to the redeclared record instance. This is the recommended approach for equally sized units such as headered pumps.
Those various use cases are illustrated in Buildings.Templates.Components.Validation.PumpMultipleRecord.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Generic | per[max(nPum, 1)] | per(pressure(V_flow=if typ <... | Performance data - Each pump |
| Density | rho_default | Modelica.Media.Water.Constan... | Default medium density [kg/m3] |
| Configuration | |||
| Pump | typ | Equipment type | |
| Integer | nPum | Number of pumps | |
| Nominal condition | |||
| MassFlowRate | m_flow_nominal[nPum] | Mass flow rate - Each pump [kg/s] | |
| PressureDifference | dp_nominal[nPum] | Total pressure rise - Each pump [Pa] | |
Modelica definition
record PumpMultiple "Record for multiple-pump models"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Pump typ
"Equipment type";
parameter Integer nPum(
final min=0,
start=0)
"Number of pumps";
parameter Modelica.Units.SI.MassFlowRate m_flow_nominal[nPum](
each start=1,
each final min=0)
"Mass flow rate - Each pump";
parameter Modelica.Units.SI.PressureDifference dp_nominal[nPum](
each start=0,
each final min=0)
"Total pressure rise - Each pump";
// To avoid missing support for zero-sized record in case of nPum=0 we use max(nPum, 1).
replaceable parameter Fluid.Movers.Data.Generic per[max(nPum, 1)](
pressure(
V_flow=if typ<>Buildings.Templates.Components.Types.Pump.None then
{{0, 1, 2} * m_flow_nominal[i] / rho_default for i in 1:nPum} else [0],
dp=if typ<>Buildings.Templates.Components.Types.Pump.None then
{{1.14, 1, 0.42} * dp_nominal[i] for i in 1:nPum} else [0]))
constrainedby Buildings.Fluid.Movers.Data.Generic
"Performance data - Each pump";
parameter Modelica.Units.SI.Density rho_default=
Modelica.Media.Water.ConstantPropertyLiquidWater.d_const
"Default medium density";
end PumpMultiple;
Buildings.Templates.Components.Data.PumpSingle
Record for single pump model
Information
This record provides the set of sizing and operating parameters for the single pump model Buildings.Templates.Components.Pumps.Single.
A default flow characteristic is provided and can be overwritten as described in the documentation of Buildings.Templates.Components.Data.PumpMultiple in the more generic case of multiple units.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Generic | per | per(pressure(V_flow={0,1,2}*... | Performance data |
| Density | rho_default | Modelica.Media.Water.Constan... | Default medium density [kg/m3] |
| Configuration | |||
| Pump | typ | Equipment type | |
| Nominal condition | |||
| MassFlowRate | m_flow_nominal | Mass flow rate [kg/s] | |
| PressureDifference | dp_nominal | Total pressure rise [Pa] | |
Modelica definition
record PumpSingle "Record for single pump model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Pump typ
"Equipment type";
parameter Modelica.Units.SI.MassFlowRate m_flow_nominal(
start=1,
final min=0)
"Mass flow rate";
parameter Modelica.Units.SI.PressureDifference dp_nominal(
start=0,
final min=0)
"Total pressure rise";
replaceable parameter Buildings.Fluid.Movers.Data.Generic per(
pressure(
V_flow={0, 1, 2} * m_flow_nominal / rho_default,
dp={1.14, 1, 0.42} * dp_nominal))
constrainedby Buildings.Fluid.Movers.Data.Generic
"Performance data";
parameter Modelica.Units.SI.Density rho_default=
Modelica.Media.Water.ConstantPropertyLiquidWater.d_const
"Default medium density";
end PumpSingle;
Buildings.Templates.Components.Data.Valve
Record for valve model
Information
This record provides the set of sizing parameters for the class Buildings.Templates.Components.Actuators.Valve.
Extends from Modelica.Icons.Record (Icon for records).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Configuration | |||
| Valve | typ | Equipment type | |
| Nominal condition | |||
| MassFlowRate | m_flow_nominal | Nominal mass flow rate of fully open valve [kg/s] | |
| PressureDifference | dpValve_nominal | Nominal pressure drop of fully open valve [Pa] | |
| PressureDifference | dpFixed_nominal | 0 | Nominal pressure drop of pipes and other equipment in flow leg [Pa] |
| PressureDifference | dpFixedByp_nominal | dpFixed_nominal | Nominal pressure drop in the bypass line [Pa] |
Modelica definition
record Valve "Record for valve model"
extends Modelica.Icons.Record;
parameter Buildings.Templates.Components.Types.Valve typ
"Equipment type";
parameter Modelica.Units.SI.MassFlowRate m_flow_nominal(
final min=0,
start=1)
"Nominal mass flow rate of fully open valve";
parameter Modelica.Units.SI.PressureDifference dpValve_nominal(
final min=0,
displayUnit="Pa",
start=0)
"Nominal pressure drop of fully open valve";
parameter Modelica.Units.SI.PressureDifference dpFixed_nominal(
final min=0,
displayUnit="Pa")=0
"Nominal pressure drop of pipes and other equipment in flow leg";
parameter Modelica.Units.SI.PressureDifference dpFixedByp_nominal(
final min=0,
displayUnit="Pa")=dpFixed_nominal
"Nominal pressure drop in the bypass line";
end Valve;