Collection of validation models
Information
This package contains validation models for the classes in
Buildings.Fluid.Movers.
Note that most validation models contain simple input data
which may not be realistic, but for which the correct
output can be obtained through an analytic solution.
The examples plot various outputs, which have been verified against these
solutions. These model outputs are stored as reference data and
used for continuous validation whenever models in the library change.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
Fans with different control signals as input
Information
This example demonstrates the use of the flow model with four different configurations.
At steady-state, all flow models have the same mass flow rate and pressure difference.
Note that addPowerToMedium=false since otherwise,
Dymola computes the enthalpy change of the component as a fraction (k*m_flow+P_internal)/m_flow
which leads to an error because of 0/0 at zero flow rate.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.ControlledFlowMachine.
Modelica definition
Fans with different control signals as input and a dynamic speed signal
Information
This example demonstrates the use of the flow model with four different configurations.
At steady-state, all flow models have the same mass flow rate and pressure difference.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.ControlledFlowMachine.
Modelica definition
model ControlledFlowMachineDynamic
"Fans with different control signals as input and a dynamic speed signal"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.ControlledFlowMachine(
fan4(dynamicBalance=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
fan1(dynamicBalance=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
fan2(dynamicBalance=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
fan3(dynamicBalance=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial));
end ControlledFlowMachineDynamic;
Fan with zero mass flow rate and head as input
Information
This example demonstrates and tests the use of a flow machine whose mass flow rate is reduced to zero.
The fans have been configured as steady-state models.
This ensures that the actual speed is equal to the input signal.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow (Base class to test flow machines with zero flow rate).
Parameters
| Type | Name | Default | Description |
|---|
| replaceable package Medium | Air | Medium model |
| MassFlowRate | m_flow_nominal | 1 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 500 | Nominal pressure difference [Pa] |
Modelica definition
model FlowControlled_dp
"Fan with zero mass flow rate and head as input"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow(
gain(k=dp_nominal),
redeclare Buildings.Fluid.Movers.FlowControlled_dp floMacSta(
redeclare package Medium =
Medium,
m_flow_nominal=m_flow_nominal,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
redeclare Buildings.Fluid.Movers.FlowControlled_dp floMacDyn(
redeclare package Medium =
Medium,
m_flow_nominal=m_flow_nominal,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial));
equation
connect(gain.y, floMacSta.dp_in);
connect(gain.y, floMacDyn.dp_in);
end FlowControlled_dp;
Fan with zero mass flow rate and mass flow rate as input
Information
This example demonstrates and tests the use of a flow machine whose mass flow rate is reduced to zero.
The fans have been configured as steady-state models.
This ensures that the actual speed is equal to the input signal.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow (Base class to test flow machines with zero flow rate).
Parameters
| Type | Name | Default | Description |
|---|
| replaceable package Medium | Air | Medium model |
| MassFlowRate | m_flow_nominal | 1 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 500 | Nominal pressure difference [Pa] |
Modelica definition
model FlowControlled_m_flow
"Fan with zero mass flow rate and mass flow rate as input"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow(
gain(k=m_flow_nominal),
redeclare Buildings.Fluid.Movers.FlowControlled_m_flow floMacSta(
redeclare package Medium =
Medium,
m_flow_nominal=m_flow_nominal,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
redeclare Buildings.Fluid.Movers.FlowControlled_m_flow floMacDyn(
redeclare package Medium =
Medium,
m_flow_nominal=m_flow_nominal,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial));
equation
connect(gain.y, floMacSta.m_flow_in);
connect(gain.y, floMacDyn.m_flow_in);
end FlowControlled_m_flow;
Power calculation comparison among three mover types
Information
This example compares the power consumed by pumps that
take three different control signals.
Each pump has identical mass flow rate and pressure rise.
Note that for the instances
Buildings.Fluid.Movers.FlowControlled_dp
and
Buildings.Fluid.Movers.FlowControlled_m_flow,
we had to assign the efficiencies (otherwise the default constant
efficiency of 0.7 would have been used).
We also had to set use_powerCharacteristic=true.
Otherwise, the power consumption would have been computed
using similarity laws, but using the mass flow rate as opposed
to the speed, because speed is not known in these two models.
This would yield an error at operating points in which
the speed is different from the nominal speed N_nominal
because similarity laws are valid for speed and not for
mass flow rate.
To see the error, change the assignment
parameter Data.FlowControlled perMod(
use_powerCharacteristic = true,
hydraulicEfficiency=efficiency,
motorEfficiency=efficiency,
power=per.power)
"Pump performance data with data from the instance efficiency";
to
parameter Data.FlowControlled perMod
"Pump performance data with data from the instance efficiency";
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
Modelica definition
model Power
"Power calculation comparison among three mover types"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Water "Medium model";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal=3
"Nominal mass flow rate";
parameter Data.Pumps.Wilo.Stratos30slash1to8 per
"Pump performance data";
parameter Data.FlowControlled perMod(
use_powerCharacteristic = true,
hydraulicEfficiency=efficiency,
motorEfficiency=efficiency,
power=per.power)
"Pump performance data with data from the instance efficiency";
// Compute the actual efficiencies
parameter Buildings.Fluid.Movers.BaseClasses.Characteristics.efficiencyParameters
efficiency(V_flow=per.pressure.V_flow, eta=
sqrt(per.pressure.V_flow.*per.pressure.dp./
{
Buildings.Fluid.Movers.BaseClasses.Characteristics.power(
per=per.power,
V_flow=i,
r_N=1,
delta=0.01,
d=
Buildings.Utilities.Math.Functions.splineDerivatives(
x=per.power.V_flow,
y=per.power.P))
for i
in per.pressure.V_flow}))
"Hydraulic and motor efficiency";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump_Nrpm(
redeclare package Medium = Medium,
per=per,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyStateInitial)
"Pump with RPM as control signal";
Buildings.Fluid.Movers.FlowControlled_dp pump_dp(
redeclare package Medium = Medium,
per=perMod,
filteredSpeed=false,
m_flow_nominal=m_flow_nominal,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyStateInitial)
"Pump with pressure rise as control signal";
Buildings.Fluid.Movers.FlowControlled_m_flow pump_m_flow(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
per=perMod,
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyStateInitial)
"Pump with mass flow rate as control signal";
Buildings.Fluid.Sources.Boundary_pT bou(
nPorts=3,
redeclare package Medium = Medium)
"Pressure source";
Buildings.Fluid.FixedResistances.FixedResistanceDpM[3] res(
redeclare each package Medium = Medium,
each m_flow_nominal=m_flow_nominal,
each dp_nominal=40000)
"Flow resistance";
Buildings.Fluid.Sources.Boundary_pT sink(
nPorts=3,
redeclare package Medium = Medium);
Modelica.Blocks.Sources.Ramp ramp(
duration=100,
startTime=10,
height=1000,
offset=2400)
"Ramp for pump speed control signal";
Modelica.Blocks.Sources.RealExpression dpSet(y=pump_Nrpm.port_b.p - pump_Nrpm.port_a.p)
"Pressure rise across pump";
Modelica.Blocks.Sources.RealExpression m_flowSet(y=pump_Nrpm.port_a.m_flow)
"Pump mass flow rate";
Modelica.Blocks.Routing.Multiplex3 result;
equation
connect(bou.ports[1], pump_Nrpm.port_a);
connect(pump_dp.port_a, bou.ports[2]);
connect(pump_m_flow.port_a, bou.ports[3]);
connect(pump_Nrpm.port_b, res[1].port_a);
connect(pump_dp.port_b, res[2].port_a);
connect(pump_m_flow.port_b, res[3].port_a);
connect(sink.ports[1:3], res.port_b);
connect(ramp.y, pump_Nrpm.Nrpm);
connect(m_flowSet.y, pump_m_flow.m_flow_in);
connect(result.u1[1], pump_Nrpm.P);
connect(result.u2[1], pump_dp.P);
connect(result.u3[1], pump_m_flow.P);
connect(dpSet.y, pump_dp.dp_in);
end Power;
Validation model that tests that the pump curve is properly extrapolated to V=0 and dp=0
Information
This example tests whether the construction of the pump curve is correct implemented
for the cases where no data point is given at zero head, zero mass flow rate, or both.
Each pump is identical, but different points on the pump curve are specified.
However, the pump curves are linear and hence, because the pump curves are linearly
extrapolated, all four pumps need to give the same flow rate.
Implementation
The pump curves are such that the protected parameter curve
of the pumps have different values. This then tests the correct extrapolation.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| MassFlowRate | m_flow_nominal | 1 | Nominal mass flow rate at zero pump head [kg/s] |
| VolumeFlowRate | V_flow_nominal | m_flow_nominal/1000 | Nominal mass flow rate at zero pump head [m3/s] |
| Pressure | dp_nominal | 10000 | Nominal pump head at zero mass flow rate [Pa] |
Modelica definition
model PumpCurveConstruction
"Validation model that tests that the pump curve is properly extrapolated to V=0 and dp=0"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Water "Medium model";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal = 1
"Nominal mass flow rate at zero pump head";
parameter Modelica.SIunits.VolumeFlowRate V_flow_nominal = m_flow_nominal/1000
"Nominal mass flow rate at zero pump head";
parameter Modelica.SIunits.Pressure dp_nominal = 10000
"Nominal pump head at zero mass flow rate";
Actuators.Valves.TwoWayLinear val1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
filteredOpening=false,
dpValve_nominal=dp_nominal/1000,
from_dp=false)
"Valve with very small pressure drop if fully open";
Sources.Boundary_pT sou(
redeclare package Medium = Medium,
use_p_in=false,
nPorts=8,
p=101325,
T=293.15)
"Pressure boundary condition";
Modelica.Blocks.Sources.Constant yPum(k=1)
"Input signal for pump";
Buildings.Fluid.Movers.SpeedControlled_y pum(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
filteredSpeed=false,
per(pressure(
V_flow={0,0.5*V_flow_nominal,V_flow_nominal},
dp={dp_nominal,0.5*dp_nominal,0})))
"Pump with 3 data points for the pressure flow relation";
Buildings.Fluid.Movers.SpeedControlled_y pum_dp(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
filteredSpeed=false,
per(pressure(
V_flow={0.5*V_flow_nominal, 0.75*V_flow_nominal, V_flow_nominal},
dp={0.5*dp_nominal, 0.25*dp_nominal, 0})))
"Pump with 2 data points for the pressure flow relation, with data at dp=0";
Buildings.Fluid.Movers.SpeedControlled_y pum_m_flow(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
filteredSpeed=false,
per(pressure(
V_flow={0, 0.25*V_flow_nominal, 0.5*V_flow_nominal},
dp={dp_nominal, 0.75*dp_nominal, 0.5*dp_nominal})))
"Pump with 2 data points for the pressure flow relation, with data at m_flow=0";
Buildings.Fluid.Movers.SpeedControlled_y pum_no(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
filteredSpeed=false,
per(pressure(
V_flow={0.25*V_flow_nominal,0.5*V_flow_nominal,0.75*V_flow_nominal},
dp={0.75*dp_nominal,0.5*dp_nominal,0.25*dp_nominal})))
"Pump with 2 data points for the pressure flow relation, with no data at m_flow=0 and dp=0";
Modelica.Blocks.Sources.Ramp yVal(
height=-1,
duration=1,
offset=1)
"Input signal for valve";
Actuators.Valves.TwoWayLinear val2(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
filteredOpening=false,
dpValve_nominal=dp_nominal/1000,
from_dp=false)
"Valve with very small pressure drop if fully open";
Actuators.Valves.TwoWayLinear val3(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
filteredOpening=false,
dpValve_nominal=dp_nominal/1000,
from_dp=false)
"Valve with very small pressure drop if fully open";
Actuators.Valves.TwoWayLinear val4(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
filteredOpening=false,
dpValve_nominal=dp_nominal/1000,
from_dp=false)
"Valve with very small pressure drop if fully open";
equation
connect(yPum.y, pum.y);
connect(pum.port_a, val1.port_b);
connect(val1.port_a, sou.ports[1]);
connect(yVal.y, val1.y);
connect(pum_dp.port_a, val2.port_b);
connect(pum_m_flow.port_a, val3.port_b);
connect(sou.ports[2], val2.port_a);
connect(val3.port_a, sou.ports[3]);
connect(yVal.y, val2.y);
connect(yVal.y, val3.y);
connect(yPum.y, pum_dp.y);
connect(yPum.y, pum_m_flow.y);
connect(val4.port_a, sou.ports[4]);
connect(val4.port_b, pum_no.port_a);
connect(yVal.y, val4.y);
connect(yPum.y, pum_no.y);
connect(pum_no.port_b, sou.ports[5]);
connect(pum_m_flow.port_b, sou.ports[6]);
connect(pum_dp.port_b, sou.ports[7]);
connect(pum.port_b, sou.ports[8]);
end PumpCurveConstruction;
Model validation using a Wilo Stratos 80/1-12 pump
Information
This example provides a validation for the Nrpm model.
A Wilo Stratos 80/1-12 pump is simulated for five different RPMs for load
that changes with time.
The resulting curves for the pump head and mass flow rate are plotted
using colored lines over the pump data sheet.
The resulting figures are shown below.
Pump heads:
Pump electrical power:
The figures are adapted from the
Wilo Stratos 80/1-12 data sheet.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
Modelica definition
model Pump_Nrpm_stratos
"Model validation using a Wilo Stratos 80/1-12 pump"
extends Modelica.Icons.Example;
package Medium =
Modelica.Media.Water.ConstantPropertyLiquidWater;
parameter Data.Pumps.Wilo.Stratos80slash1to12 per
"Pump performance data";
Buildings.Fluid.Sources.Boundary_pT sou(
redeclare package Medium = Medium,
nPorts=5)
"Boundary condition with fixed pressure";
Buildings.Fluid.Sources.Boundary_pT sin(
redeclare package Medium =Medium,
nPorts=5)
"Boundary condition with fixed pressure";
Modelica.Blocks.Sources.Ramp m_flow(
startTime=100,
duration=800,
height=60/3.6,
offset=0)
"Ramp signal for forced mass flow rate";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump1(
y_start=1,
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
per=per)
"Wilo Stratos pump";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump2(
y_start=1,
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
per=per)
"Wilo Stratos pump";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump3(
y_start=1,
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
per=per)
"Wilo Stratos pump";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump4(
y_start=1,
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
per=per)
"Wilo Stratos pump";
Buildings.Fluid.Movers.SpeedControlled_Nrpm pump5(
y_start=1,
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
per=per)
"Wilo Stratos pump";
Buildings.Fluid.Movers.FlowControlled_m_flow forcedPump1(
redeclare package
Medium = Medium, m_flow_nominal=3,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
"Pump for forcing a certain mass flow rate";
Buildings.Fluid.Movers.FlowControlled_m_flow forcedPump2(
redeclare package
Medium = Medium, m_flow_nominal=3,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
"Pump for forcing a certain mass flow rate";
Buildings.Fluid.Movers.FlowControlled_m_flow forcedPump3(
redeclare package
Medium = Medium, m_flow_nominal=3,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
"Pump for forcing a certain mass flow rate";
Buildings.Fluid.Movers.FlowControlled_m_flow forcedPump4(
redeclare package
Medium = Medium, m_flow_nominal=3,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
"Pump for forcing a certain mass flow rate";
Buildings.Fluid.Movers.FlowControlled_m_flow forcedPump5(
redeclare package
Medium = Medium, m_flow_nominal=3,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
"Pump for forcing a certain mass flow rate";
Modelica.Blocks.Sources.Constant rpm1(k=2960)
"Pump speed control signal";
Modelica.Blocks.Sources.Constant rpm2(k=2610)
"Pump speed control signal";
Modelica.Blocks.Sources.Constant rpm3(k=1930)
"Pump speed control signal";
Modelica.Blocks.Sources.Constant rpm4(k=3300)
"Pump speed control signal";
Modelica.Blocks.Sources.Constant rpm5(k=900)
"Pump speed control signal";
Modelica.Blocks.Math.Min min1
"Minimum for not going outside of the figure range (see documentation)";
Modelica.Blocks.Math.Min min2
"Minimum for not going outside of the figure range (see documentation)";
Modelica.Blocks.Math.Min min3
"Minimum for not going outside of the figure range (see documentation)";
Modelica.Blocks.Math.Min min4
"Minimum for not going outside of the figure range (see documentation)";
Modelica.Blocks.Math.Min min5
"Minimum for not going outside of the figure range (see documentation)";
Modelica.Blocks.Sources.Constant mMax_flow1(k=40/3.6)
"Maximum flow rate of the pump at given rpm";
Modelica.Blocks.Sources.Constant mMax_flow2(k=55/3.6)
"Maximum flow rate of the pump at given rpm";
Modelica.Blocks.Sources.Constant mMax_flow3(k=40/3.6)
"Maximum flow rate of the pump at given rpm";
Modelica.Blocks.Sources.Constant mMax_flow4(k=22/3.6)
"Maximum flow rate of the pump at given rpm";
Modelica.Blocks.Sources.Constant mMax_flow5(k=16/3.6)
"Maximum flow rate of the pump at given rpm";
equation
connect(sou.ports[1], pump1.port_a);
connect(forcedPump1.port_a, pump1.port_b);
connect(pump1.Nrpm, rpm1.y);
connect(pump2.port_a, sou.ports[2]);
connect(pump3.port_a, sou.ports[3]);
connect(pump4.port_a, sou.ports[4]);
connect(pump5.port_a, sou.ports[5]);
connect(pump2.port_b, forcedPump2.port_a);
connect(pump3.port_b, forcedPump3.port_a);
connect(pump4.port_b, forcedPump4.port_a);
connect(pump5.port_b, forcedPump5.port_a);
connect(rpm2.y, pump2.Nrpm);
connect(rpm3.y, pump3.Nrpm);
connect(rpm4.y, pump4.Nrpm);
connect(rpm5.y, pump5.Nrpm);
connect(forcedPump1.m_flow_in, min1.y);
connect(min1.u1, m_flow.y);
connect(min2.y, forcedPump2.m_flow_in);
connect(min2.u1, m_flow.y);
connect(min3.y, forcedPump3.m_flow_in);
connect(min5.y, forcedPump5.m_flow_in);
connect(min4.y, forcedPump4.m_flow_in);
connect(min3.u1, m_flow.y);
connect(min4.u1, m_flow.y);
connect(min5.u1, m_flow.y);
connect(mMax_flow1.y, min1.u2);
connect(mMax_flow2.y, min2.u2);
connect(min3.u2, mMax_flow3.y);
connect(mMax_flow4.y, min4.u2);
connect(mMax_flow5.y, min5.u2);
connect(forcedPump1.port_b, sin.ports[1]);
connect(forcedPump2.port_b, sin.ports[2]);
connect(forcedPump3.port_b, sin.ports[3]);
connect(forcedPump4.port_b, sin.ports[4]);
connect(forcedPump5.port_b, sin.ports[5]);
end Pump_Nrpm_stratos;
Stratos pumps with speed as input
Information
This example demonstrates and tests the use of a flow machine that uses
a performance data from a Stratos pump.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow (Base class to test flow machines with zero flow rate).
Parameters
| Type | Name | Default | Description |
|---|
| replaceable package Medium | Air | Medium model |
| MassFlowRate | m_flow_nominal | floMacSta.per.pressure.V_flo... | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | floMacSta.per.pressure.dp[3]/2 | Nominal pressure difference [Pa] |
| Stratos25slash1to6 | per | | |
Connectors
| Type | Name | Description |
|---|
| replaceable package Medium | Medium model |
Modelica definition
model Pump_stratos
"Stratos pumps with speed as input"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow(
redeclare package Medium =
Buildings.Media.Water,
gain(k=floMacSta.per.N_nominal),
m_flow_nominal=floMacSta.per.pressure.V_flow[3]*1000,
dp_nominal=floMacSta.per.pressure.dp[3]/2,
redeclare Buildings.Fluid.Movers.SpeedControlled_Nrpm floMacSta(
redeclare package Medium = Medium,
filteredSpeed=false,
per=per),
redeclare Buildings.Fluid.Movers.SpeedControlled_Nrpm floMacDyn(
redeclare package Medium = Medium,
filteredSpeed=false,
per=per));
parameter Data.Pumps.Wilo.Stratos25slash1to6 per;
equation
connect(gain.y, floMacSta.Nrpm);
connect(gain.y, floMacDyn.Nrpm);
end Pump_stratos;
Fan with zero mass flow rate and speed as input
Information
This example demonstrates and tests the use of a flow machine whose mass flow rate is reduced to zero.
The fans have been configured as steady-state models.
This ensures that the actual speed is equal to the input signal.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow (Base class to test flow machines with zero flow rate).
Parameters
| Type | Name | Default | Description |
|---|
| replaceable package Medium | Air | Medium model |
| MassFlowRate | m_flow_nominal | 1 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 500 | Nominal pressure difference [Pa] |
Modelica definition
model SpeedControlled_Nrpm
"Fan with zero mass flow rate and speed as input"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow(
gain(k=1500),
redeclare Buildings.Fluid.Movers.SpeedControlled_Nrpm floMacSta(
redeclare package Medium =
Medium,
per(pressure(V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
dp={2*dp_nominal,dp_nominal,0})),
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
redeclare Buildings.Fluid.Movers.SpeedControlled_Nrpm floMacDyn(
redeclare package Medium =
Medium,
per(pressure(V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
dp={2*dp_nominal,dp_nominal,0})),
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial));
equation
connect(gain.y, floMacSta.Nrpm);
connect(gain.y, floMacDyn.Nrpm);
end SpeedControlled_Nrpm;
Fan with zero mass flow rate and control signal y as input
Information
This example demonstrates and tests the use of a flow machine whose mass flow rate is reduced to zero.
The fans have been configured as steady-state models.
This ensures that the actual speed is equal to the input signal.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow (Base class to test flow machines with zero flow rate).
Parameters
| Type | Name | Default | Description |
|---|
| replaceable package Medium | Air | Medium model |
| MassFlowRate | m_flow_nominal | 1 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 500 | Nominal pressure difference [Pa] |
Modelica definition
model SpeedControlled_y
"Fan with zero mass flow rate and control signal y as input"
extends Modelica.Icons.Example;
extends Buildings.Fluid.Movers.Validation.BaseClasses.FlowMachine_ZeroFlow(
gain(k=1),
redeclare Buildings.Fluid.Movers.SpeedControlled_y floMacSta(
redeclare package Medium =
Medium,
per(pressure(V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
dp={2*dp_nominal,dp_nominal,0})),
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial),
redeclare Buildings.Fluid.Movers.SpeedControlled_y floMacDyn(
redeclare package Medium =
Medium,
per(pressure(V_flow={0,m_flow_nominal,2*m_flow_nominal}/1.2,
dp={2*dp_nominal,dp_nominal,0})),
filteredSpeed=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial));
equation
connect(gain.y, floMacDyn.y);
connect(gain.y, floMacSta.y);
end SpeedControlled_y;
Pump with linear characteristic for pressure vs. flow rate
Information
This example demonstrates and tests the use of a flow machine whose speed is reduced to zero.
In the top model, the pressure drop across the pump is constant, and in the bottom model,
the mass flow rate across the pump is constant.
In the top model, a small flow resistance has been added since a pump with zero speed cannot
produce a non-zero pressure raise. For this operating region, the pressure drop ensures that
the model is non-singular.
The fans have been configured as steady-state models.
This ensures that the actual speed is equal to the input signal.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|
| MassFlowRate | m_flow_nominal | 0.5 | Nominal mass flow rate [kg/s] |
| Pressure | dp_nominal | 10000 | Nominal pressure [Pa] |
Modelica definition
model SpeedControlled_y_linear
"Pump with linear characteristic for pressure vs. flow rate"
extends Modelica.Icons.Example;
package Medium =
Buildings.Media.Water "Medium model";
parameter Modelica.SIunits.MassFlowRate m_flow_nominal = 0.5
"Nominal mass flow rate";
parameter Modelica.SIunits.Pressure dp_nominal = 10000
"Nominal pressure";
Modelica.Blocks.Sources.Ramp y(
offset=1,
duration=0.5,
startTime=0.25,
height=-1)
"Input signal";
Buildings.Fluid.Sources.Boundary_pT sou(
redeclare package Medium = Medium,
use_p_in=false,
p=300000,
T=293.15,
nPorts=1);
Buildings.Fluid.Movers.SpeedControlled_y pumFixDp(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
per(pressure(V_flow=2/1000*{0, m_flow_nominal}, dp={2*dp_nominal, 0})),
filteredSpeed=false)
"Pump with fixed pressure raise";
Buildings.Fluid.Sources.Boundary_pT sou1(
redeclare package Medium = Medium,
use_p_in=false,
p(displayUnit="Pa") = 300000 + 0.01*dp_nominal,
T=293.15,
nPorts=1);
Buildings.Fluid.FixedResistances.FixedResistanceDpM dp1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dp_nominal=0.01*dp_nominal)
"Pressure drop";
Buildings.Fluid.Sources.MassFlowSource_T
sou2(
redeclare package Medium = Medium,
nPorts=1,
m_flow=m_flow_nominal*0.01,
T=293.15);
Buildings.Fluid.Movers.SpeedControlled_y pumFixM_flow(
redeclare package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dynamicBalance=false,
per(pressure(V_flow=2/1000*{0, m_flow_nominal}, dp={2*dp_nominal, 0})),
filteredSpeed=false)
"Pump with fixed mass flow rate";
Buildings.Fluid.Sources.Boundary_pT sou3(
redeclare package Medium = Medium,
use_p_in=false,
p(displayUnit="Pa") = 300000 + 0.01*dp_nominal,
T=293.15,
nPorts=1);
equation
connect(pumFixDp.port_b, sou1.ports[1]);
connect(dp1.port_b, pumFixDp.port_a);
connect(dp1.port_a, sou.ports[1]);
connect(pumFixM_flow.port_b, sou3.ports[1]);
connect(sou2.ports[1], pumFixM_flow.port_a);
connect(y.y, pumFixDp.y);
connect(y.y, pumFixM_flow.y);
end SpeedControlled_y_linear;
Automatically generated Mon Jul 13 14:25:53 2015.
ControlledFlowMachine
PumpCurveConstruction
Pump_Nrpm_stratos
BaseClasses
Buildings.Fluid.Movers.Validation.ControlledFlowMachine
Buildings.Fluid.Movers.Validation.PumpCurveConstruction
Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos