Buildings.Fluid.Movers

Home > Modelica

Buildings.Fluid.Movers

Package with fan and pump models

Information

This package contains components models for fans and pumps.

Extends from Modelica.Icons.Package (Icon for standard packages).

Package Content

Name	Description
UsersGuide	User's Guide
FlowControlled_dp	Fan or pump with ideally controlled head dp as input signal
FlowControlled_m_flow	Fan or pump with ideally controlled mass flow rate as input signal
SpeedControlled_Nrpm	Fan or pump with ideally controlled speed Nrpm as input signal
SpeedControlled_y	Fan or pump with ideally controlled normalized speed y as input signal
Data	Package containing data for real pumps/fans
Examples	Collection of models that illustrate model use and test models
Validation	Collection of validation models
BaseClasses	Package with base classes for Buildings.Fluid.Movers

Buildings.Fluid.Movers.FlowControlled_dp

Fan or pump with ideally controlled head dp as input signal

Buildings.Fluid.Movers.FlowControlled_dp

Information

This model describes a fan or pump with prescribed head. The input connector provides the difference between outlet minus inlet pressure. The efficiency of the device is computed based on the efficiency and pressure curves that are defined in record per, which is of type Buildings.Fluid.Movers.SpeedControlled_Nrpm.

If filteredSpeed=true, then the parameter dp_nominal is used to normalize the filter. This is used to improve the numerics of the transient response. The actual pressure raise of the mover at steady-state is independent of the value of dp_nominal. It is recommended to set dp_nominal to approximately the pressure raise that the fan has during full speed.

See the User's Guide for more information.

Extends from Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine (Partial model to interface fan or pump models with the medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Generic	per	redeclare parameter Building...	Record with performance data
Boolean	computePowerUsingSimilarityLaws	per.havePressureCurve	= true, compute power exactly, using similarity laws. Otherwise approximate.
Boolean	addPowerToMedium	true	Set to false to avoid any power (=heat and flow work) being added to medium (may give simpler equations)
Boolean	nominalValuesDefineDefaultPressureCurve	false	Set to true to avoid warning if m_flow_nominal and dp_nominal are used to construct the default pressure curve
PressureDifference	constantHead	dp_nominal	Constant pump head, used when inputType=Constant [Pa]
PressureDifference	heads[:]	dp_nominal*{1}	Vector of head set points, used when inputType=Stages [Pa]
Nominal condition
MassFlowRate	m_flow_nominal		Nominal mass flow rate [kg/s]
PressureDifference	dp_nominal	if rho_default < 500 then 50...	Nominal pressure raise, used to normalized the filter if filteredSpeed=true, to set default values of constantHead and heads, and and for default pressure curve if not specified in record per [Pa]
Initialization
MassFlowRate	m_flow.start	0	Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) [kg/s]
PressureDifference	dp.start	0	Pressure difference between port_a and port_b [Pa]
Control
InputType	inputType	Buildings.Fluid.Types.InputT...	Control input type
Dynamics
Equations
Dynamics	energyDynamics	Modelica.Fluid.Types.Dynamic...	Type of energy balance: dynamic (3 initialization options) or steady state
Dynamics	massDynamics	energyDynamics	Type of mass balance: dynamic (3 initialization options) or steady state
Nominal condition
Time	tau	1	Time constant of fluid volume for nominal flow, used if energy or mass balance is dynamic [s]
Filtered speed
Boolean	filteredSpeed	true	= true, if speed is filtered with a 2nd order CriticalDamping filter
Time	riseTime	30	Rise time of the filter (time to reach 99.6 % of the speed) [s]
Init	init	Modelica.Blocks.Types.Init.I...	Type of initialization (no init/steady state/initial state/initial output)
Real	y_start	0	Initial value of speed [1]
PressureDifference	dp_start	0	Initial value of pressure raise [Pa]
Initialization
AbsolutePressure	p_start	Medium.p_default	Start value of pressure [Pa]
Temperature	T_start	Medium.T_default	Start value of temperature [K]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
ExtraProperty	C_nominal[Medium.nC]	fill(1E-2, Medium.nC)	Nominal value of trace substances. (Set to typical order of magnitude.)
Assumptions
Boolean	allowFlowReversal	true	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced
MassFlowRate	m_flow_small	1E-4*abs(m_flow_nominal)	Small mass flow rate for regularization of zero flow [kg/s]
Diagnostics
Boolean	show_T	false	= true, if actual temperature at port is computed

Connectors

Type	Name	Description
FluidPort_a	port_a	Fluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_b	port_b	Fluid connector b (positive design flow direction is from port_a to port_b)
input IntegerInput	stage	Stage input signal for the pressure head
output RealOutput	y_actual	Actual normalised pump speed that is used for computations [1]
output RealOutput	P	Electrical power consumed [W]
HeatPort_a	heatPort	Heat dissipation to environment
input RealInput	dp_in	Prescribed pressure rise [Pa]
output RealOutput	dp_actual	[Pa]

Modelica definition

model FlowControlled_dp "Fan or pump with ideally controlled head dp as input signal" extends Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine( final preVar=Buildings.Fluid.Movers.BaseClasses.Types.PrescribedVariable.PressureDifference, final computePowerUsingSimilarityLaws=per.havePressureCurve, preSou(dp_start=dp_start), final stageInputs(each final unit="Pa") = heads, final constInput(final unit="Pa") = constantHead, filter( final y_start=dp_start, u_nominal=abs(dp_nominal), u(final unit="Pa"), y(final unit="Pa")), eff( per( final pressure = if per.havePressureCurve then per.pressure else Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters( V_flow= {i/(nOri-1)*2.0*m_flow_nominal/rho_default for i in 0:(nOri-1)}, dp= {i/(nOri-1)*2.0*dp_nominal for i in (nOri-1):-1:0}), final use_powerCharacteristic = if per.havePressureCurve then per.use_powerCharacteristic else false))); parameter Modelica.SIunits.PressureDifference dp_start( min=0, displayUnit="Pa")=0 "Initial value of pressure raise"; // For air, we set dp_nominal = 600 as default, for water we set 10000 parameter Modelica.SIunits.PressureDifference dp_nominal( min=0, displayUnit="Pa")= if rho_default < 500 then 500 else 10000 "Nominal pressure raise, used to normalized the filter if filteredSpeed=true, to set default values of constantHead and heads, and and for default pressure curve if not specified in record per"; parameter Modelica.SIunits.PressureDifference constantHead( min=0, displayUnit="Pa")=dp_nominal "Constant pump head, used when inputType=Constant"; parameter Modelica.SIunits.PressureDifference[:] heads( each min=0, each displayUnit="Pa") = dp_nominal*{1} "Vector of head set points, used when inputType=Stages"; Modelica.Blocks.Interfaces.RealInput dp_in(min=0, final unit="Pa") if inputType == Buildings.Fluid.Types.InputType.Continuous "Prescribed pressure rise"; Modelica.Blocks.Interfaces.RealOutput dp_actual(min=0, final unit="Pa", displayUnit="Pa"); protected Modelica.Blocks.Math.Gain gain(final k=-1); equation assert(inputSwitch.u >= -1E-3, "Pressure set point for mover cannot be negative. Obtained dp = " + String(inputSwitch.u)); if filteredSpeed then connect(filter.y, gain.u); else connect(inputSwitch.y, gain.u); end if; connect(inputSwitch.u, dp_in); connect(preSou.dp_in, gain.y); connect(gain.u, dp_actual); end FlowControlled_dp;

Buildings.Fluid.Movers.FlowControlled_m_flow

Fan or pump with ideally controlled mass flow rate as input signal

Buildings.Fluid.Movers.FlowControlled_m_flow

Information

This model describes a fan or pump with prescribed mass flow rate. The efficiency of the device is computed based on the efficiency and pressure curves that are defined in record per, which is of type Buildings.Fluid.Movers.SpeedControlled_Nrpm.

See the User's Guide for more information.

Extends from Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine (Partial model to interface fan or pump models with the medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Generic	per	redeclare parameter Building...	Record with performance data
Boolean	computePowerUsingSimilarityLaws	per.havePressureCurve	= true, compute power exactly, using similarity laws. Otherwise approximate.
Boolean	addPowerToMedium	true	Set to false to avoid any power (=heat and flow work) being added to medium (may give simpler equations)
Boolean	nominalValuesDefineDefaultPressureCurve	false	Set to true to avoid warning if m_flow_nominal and dp_nominal are used to construct the default pressure curve
MassFlowRate	constantMassFlowRate	m_flow_nominal	Constant pump mass flow rate, used when inputType=Constant [kg/s]
MassFlowRate	massFlowRates[:]	m_flow_nominal*{0}	Vector of mass flow rate set points, used when inputType=Stage [kg/s]
Nominal condition
MassFlowRate	m_flow_nominal		Nominal mass flow rate [kg/s]
PressureDifference	dp_nominal	if rho_default < 500 then 50...	Nominal pressure raise, used for default pressure curve if not specified in record per [Pa]
Initialization
MassFlowRate	m_flow.start	0	Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) [kg/s]
PressureDifference	dp.start	0	Pressure difference between port_a and port_b [Pa]
Control
InputType	inputType	Buildings.Fluid.Types.InputT...	Control input type
Dynamics
Equations
Dynamics	energyDynamics	Modelica.Fluid.Types.Dynamic...	Type of energy balance: dynamic (3 initialization options) or steady state
Dynamics	massDynamics	energyDynamics	Type of mass balance: dynamic (3 initialization options) or steady state
Nominal condition
Time	tau	1	Time constant of fluid volume for nominal flow, used if energy or mass balance is dynamic [s]
Filtered speed
Boolean	filteredSpeed	true	= true, if speed is filtered with a 2nd order CriticalDamping filter
Time	riseTime	30	Rise time of the filter (time to reach 99.6 % of the speed) [s]
Init	init	Modelica.Blocks.Types.Init.I...	Type of initialization (no init/steady state/initial state/initial output)
Real	y_start	0	Initial value of speed [1]
MassFlowRate	m_flow_start	0	Initial value of mass flow rate [kg/s]
Initialization
AbsolutePressure	p_start	Medium.p_default	Start value of pressure [Pa]
Temperature	T_start	Medium.T_default	Start value of temperature [K]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
ExtraProperty	C_nominal[Medium.nC]	fill(1E-2, Medium.nC)	Nominal value of trace substances. (Set to typical order of magnitude.)
Assumptions
Boolean	allowFlowReversal	true	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced
MassFlowRate	m_flow_small	1E-4*abs(m_flow_nominal)	Small mass flow rate for regularization of zero flow [kg/s]
Diagnostics
Boolean	show_T	false	= true, if actual temperature at port is computed

Connectors

Type	Name	Description
FluidPort_a	port_a	Fluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_b	port_b	Fluid connector b (positive design flow direction is from port_a to port_b)
input IntegerInput	stage	Stage input signal for the pressure head
output RealOutput	y_actual	Actual normalised pump speed that is used for computations [1]
output RealOutput	P	Electrical power consumed [W]
HeatPort_a	heatPort	Heat dissipation to environment
input RealInput	m_flow_in	Prescribed mass flow rate [kg/s]
output RealOutput	m_flow_actual	Actual mass flow rate [kg/s]

Modelica definition

model FlowControlled_m_flow "Fan or pump with ideally controlled mass flow rate as input signal" extends Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine( final preVar=Buildings.Fluid.Movers.BaseClasses.Types.PrescribedVariable.FlowRate, final computePowerUsingSimilarityLaws=per.havePressureCurve, final stageInputs(each final unit="kg/s")=massFlowRates, final constInput(final unit="kg/s")=constantMassFlowRate, filter( final y_start=m_flow_start, u_nominal=m_flow_nominal, u(final unit="kg/s"), y(final unit="kg/s")), eff( per( final pressure = if per.havePressureCurve then per.pressure else Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters( V_flow= {i/(nOri-1)*2.0*m_flow_nominal/rho_default for i in 0:(nOri-1)}, dp= {i/(nOri-1)*2.0*dp_nominal for i in (nOri-1):-1:0}), final use_powerCharacteristic = if per.havePressureCurve then per.use_powerCharacteristic else false)), preSou(m_flow_start=m_flow_start)); // For air, we set dp_nominal = 600 as default, for water we set 10000 parameter Modelica.SIunits.PressureDifference dp_nominal(min=0, displayUnit="Pa")= if rho_default < 500 then 500 else 10000 "Nominal pressure raise, used for default pressure curve if not specified in record per"; parameter Modelica.SIunits.MassFlowRate m_flow_start(min=0)=0 "Initial value of mass flow rate"; parameter Modelica.SIunits.MassFlowRate constantMassFlowRate=m_flow_nominal "Constant pump mass flow rate, used when inputType=Constant"; parameter Modelica.SIunits.MassFlowRate[:] massFlowRates = m_flow_nominal*{0} "Vector of mass flow rate set points, used when inputType=Stage"; Modelica.Blocks.Interfaces.RealInput m_flow_in( final unit="kg/s", nominal=m_flow_nominal) if inputType == Buildings.Fluid.Types.InputType.Continuous "Prescribed mass flow rate"; Modelica.Blocks.Interfaces.RealOutput m_flow_actual( final unit="kg/s", nominal=m_flow_nominal) "Actual mass flow rate"; equation if filteredSpeed then connect(filter.y, m_flow_actual); else connect(inputSwitch.y, preSou.m_flow_in); end if; connect(m_flow_actual, preSou.m_flow_in); connect(inputSwitch.u, m_flow_in); end FlowControlled_m_flow;

Buildings.Fluid.Movers.SpeedControlled_Nrpm

Fan or pump with ideally controlled speed Nrpm as input signal

Buildings.Fluid.Movers.SpeedControlled_Nrpm

Information

This model describes a fan or pump with prescribed speed in revolutions per minute. The head is computed based on the performance curve that take as an argument the actual volume flow rate divided by the maximum flow rate and the relative speed of the fan. The efficiency of the device is computed based on the efficiency curves that take as an argument the actual volume flow rate divided by the maximum possible volume flow rate, or based on the motor performance curves.

See the User's Guide for more information.

Extends from Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine (Partial model to interface fan or pump models with the medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Generic	per	redeclare parameter Building...	Record with performance data
Boolean	computePowerUsingSimilarityLaws	true	= true, compute power exactly, using similarity laws. Otherwise approximate.
Boolean	addPowerToMedium	true	Set to false to avoid any power (=heat and flow work) being added to medium (may give simpler equations)
Boolean	nominalValuesDefineDefaultPressureCurve	false	Set to true to avoid warning if m_flow_nominal and dp_nominal are used to construct the default pressure curve
Nominal condition
MassFlowRate	m_flow_nominal	max(per.pressure.V_flow)*rho...	Nominal mass flow rate [kg/s]
Initialization
MassFlowRate	m_flow.start	0	Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) [kg/s]
PressureDifference	dp.start	0	Pressure difference between port_a and port_b [Pa]
Control
InputType	inputType	Buildings.Fluid.Types.InputT...	Control input type
Dynamics
Equations
Dynamics	energyDynamics	Modelica.Fluid.Types.Dynamic...	Type of energy balance: dynamic (3 initialization options) or steady state
Dynamics	massDynamics	energyDynamics	Type of mass balance: dynamic (3 initialization options) or steady state
Nominal condition
Time	tau	1	Time constant of fluid volume for nominal flow, used if energy or mass balance is dynamic [s]
Filtered speed
Boolean	filteredSpeed	true	= true, if speed is filtered with a 2nd order CriticalDamping filter
Time	riseTime	30	Rise time of the filter (time to reach 99.6 % of the speed) [s]
Init	init	Modelica.Blocks.Types.Init.I...	Type of initialization (no init/steady state/initial state/initial output)
Real	y_start	0	Initial value of speed [1]
Initialization
AbsolutePressure	p_start	Medium.p_default	Start value of pressure [Pa]
Temperature	T_start	Medium.T_default	Start value of temperature [K]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
ExtraProperty	C_nominal[Medium.nC]	fill(1E-2, Medium.nC)	Nominal value of trace substances. (Set to typical order of magnitude.)
Assumptions
Boolean	allowFlowReversal	true	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced
MassFlowRate	m_flow_small	1E-4*abs(m_flow_nominal)	Small mass flow rate for regularization of zero flow [kg/s]
Diagnostics
Boolean	show_T	false	= true, if actual temperature at port is computed

Connectors

Type	Name	Description
FluidPort_a	port_a	Fluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_b	port_b	Fluid connector b (positive design flow direction is from port_a to port_b)
input IntegerInput	stage	Stage input signal for the pressure head
output RealOutput	y_actual	Actual normalised pump speed that is used for computations [1]
output RealOutput	P	Electrical power consumed [W]
HeatPort_a	heatPort	Heat dissipation to environment
input RealInput	Nrpm	Prescribed rotational speed [1/min]

Modelica definition

model SpeedControlled_Nrpm "Fan or pump with ideally controlled speed Nrpm as input signal" extends Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine( final preVar=Buildings.Fluid.Movers.BaseClasses.Types.PrescribedVariable.Speed, final nominalValuesDefineDefaultPressureCurve=false, final computePowerUsingSimilarityLaws=true, final m_flow_nominal = max(per.pressure.V_flow)*rho_default, final stageInputs(each final unit="1") = per.speeds, final constInput(final unit="1") = per.constantSpeed, filter( final y_start=y_start, u_nominal=1, u(final unit="1"), y(final unit="1")), eff( per(final pressure = per.pressure, final use_powerCharacteristic = per.use_powerCharacteristic)), gaiSpe(u(final unit="1/min"), final k=1/per.speed_rpm_nominal)); Modelica.Blocks.Interfaces.RealInput Nrpm(final unit="1/min") if inputType == Buildings.Fluid.Types.InputType.Continuous "Prescribed rotational speed"; protected Modelica.Blocks.Math.Gain gain(final k=-1) "Pressure gain"; initial equation assert(per.havePressureCurve, "SpeedControlled_Nrpm model requires to set the pressure vs. flow rate curve in record 'per'."); equation connect(Nrpm, gaiSpe.u); connect(gaiSpe.y, inputSwitch.u); connect(eff.dp, gain.u); connect(gain.y, preSou.dp_in); if filteredSpeed then connect(filter.y, eff.y_in); else connect(inputSwitch.y, eff.y_in); end if; end SpeedControlled_Nrpm;

Buildings.Fluid.Movers.SpeedControlled_y

Fan or pump with ideally controlled normalized speed y as input signal

Buildings.Fluid.Movers.SpeedControlled_y

Information

This model describes a fan or pump with prescribed normalized speed. The input connector provides the normalized rotational speed (between 0 and 1). The head is computed based on the performance curve that take as an argument the actual volume flow rate divided by the maximum flow rate and the relative speed of the fan. The efficiency of the device is computed based on the efficiency curves that take as an argument the actual volume flow rate divided by the maximum possible volume flow rate, or based on the motor performance curves.

See the User's Guide for more information.

Extends from Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine (Partial model to interface fan or pump models with the medium).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium in the component
Generic	per	redeclare parameter Building...	Record with performance data
Boolean	computePowerUsingSimilarityLaws	true	= true, compute power exactly, using similarity laws. Otherwise approximate.
Boolean	addPowerToMedium	true	Set to false to avoid any power (=heat and flow work) being added to medium (may give simpler equations)
Boolean	nominalValuesDefineDefaultPressureCurve	false	Set to true to avoid warning if m_flow_nominal and dp_nominal are used to construct the default pressure curve
Nominal condition
MassFlowRate	m_flow_nominal	max(per.pressure.V_flow)*rho...	Nominal mass flow rate [kg/s]
Initialization
MassFlowRate	m_flow.start	0	Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) [kg/s]
PressureDifference	dp.start	0	Pressure difference between port_a and port_b [Pa]
Control
InputType	inputType	Buildings.Fluid.Types.InputT...	Control input type
Dynamics
Equations
Dynamics	energyDynamics	Modelica.Fluid.Types.Dynamic...	Type of energy balance: dynamic (3 initialization options) or steady state
Dynamics	massDynamics	energyDynamics	Type of mass balance: dynamic (3 initialization options) or steady state
Nominal condition
Time	tau	1	Time constant of fluid volume for nominal flow, used if energy or mass balance is dynamic [s]
Filtered speed
Boolean	filteredSpeed	true	= true, if speed is filtered with a 2nd order CriticalDamping filter
Time	riseTime	30	Rise time of the filter (time to reach 99.6 % of the speed) [s]
Init	init	Modelica.Blocks.Types.Init.I...	Type of initialization (no init/steady state/initial state/initial output)
Real	y_start	0	Initial value of speed [1]
Initialization
AbsolutePressure	p_start	Medium.p_default	Start value of pressure [Pa]
Temperature	T_start	Medium.T_default	Start value of temperature [K]
MassFraction	X_start[Medium.nX]	Medium.X_default	Start value of mass fractions m_i/m [kg/kg]
ExtraProperty	C_start[Medium.nC]	fill(0, Medium.nC)	Start value of trace substances
ExtraProperty	C_nominal[Medium.nC]	fill(1E-2, Medium.nC)	Nominal value of trace substances. (Set to typical order of magnitude.)
Assumptions
Boolean	allowFlowReversal	true	= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced
MassFlowRate	m_flow_small	1E-4*abs(m_flow_nominal)	Small mass flow rate for regularization of zero flow [kg/s]
Diagnostics
Boolean	show_T	false	= true, if actual temperature at port is computed

Connectors

Type	Name	Description
FluidPort_a	port_a	Fluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_b	port_b	Fluid connector b (positive design flow direction is from port_a to port_b)
input IntegerInput	stage	Stage input signal for the pressure head
output RealOutput	y_actual	Actual normalised pump speed that is used for computations [1]
output RealOutput	P	Electrical power consumed [W]
HeatPort_a	heatPort	Heat dissipation to environment
input RealInput	y	Constant normalized rotational speed [1]

Modelica definition

model SpeedControlled_y "Fan or pump with ideally controlled normalized speed y as input signal" extends Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine( final preVar=Buildings.Fluid.Movers.BaseClasses.Types.PrescribedVariable.Speed, final nominalValuesDefineDefaultPressureCurve=false, final computePowerUsingSimilarityLaws=true, final m_flow_nominal = max(per.pressure.V_flow)*rho_default, final stageInputs(each final unit="1") = per.speeds, final constInput(final unit="1") = per.constantSpeed, filter( final y_start=y_start, u_nominal=1, u(final unit="1"), y(final unit="1")), eff( per(final pressure = per.pressure, final use_powerCharacteristic = per.use_powerCharacteristic)), gaiSpe(u(final unit="1"), final k=1/per.speed_nominal)); Modelica.Blocks.Interfaces.RealInput y( min=0, unit="1") if inputType == Buildings.Fluid.Types.InputType.Continuous "Constant normalized rotational speed"; protected Modelica.Blocks.Math.Gain gain(final k=-1) "Pressure gain"; initial equation assert(per.havePressureCurve, "SpeedControlled_y requires to set the pressure vs. flow rate curve in record 'per'."); equation connect(gaiSpe.u, y); connect(gaiSpe.y, inputSwitch.u); connect(eff.dp, gain.u); connect(gain.y, preSou.dp_in); if filteredSpeed then connect(filter.y, eff.y_in); else connect(inputSwitch.y, eff.y_in); end if; end SpeedControlled_y;

http://simulationresearch.lbl.gov/modelica