Buildings.Fluid.FixedResistances.Validation
Collection of validation models
Information
This package contains validation models for the classes in Buildings.Fluid.FixedResistances.
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
| Name | Description |
|---|---|
 FlowJunctionSteadyState
|
Test model for the three way splitter/mixer model configured as steady-state |
| FlowJunctionSteadyStateNoPressureDrop
|
Test model for the three way splitter/mixer model configured as steady-state |
| LosslessPipe
|
Validation model for lossless pipe |
| PressureDropsExplicit
|
Test of multiple resistances in series |
| PressureDropsExplicitLinearized
|
Test of multiple linearized resistances in series |
| PressureDropsParallel
|
Test with multiple resistances in parallel |
| PressureDropsSeries
|
Test of multiple resistances in series |
Buildings.Fluid.FixedResistances.Validation.FlowJunctionSteadyState
Test model for the three way splitter/mixer model configured as steady-state
Information
This model validates the use of the splitter and mixer model for different flow directions. The example is configured such that the flow changes its direction in each flow leg between t = 0 seconds to t = 100 seconds. The splitter model has been configured as a steady-state model.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
model FlowJunctionSteadyState
"Test model for the three way splitter/mixer model configured as steady-state"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air "Medium model";
Buildings.Fluid.FixedResistances.Junction spl(
redeclare package Medium = Medium,
m_flow_nominal={2,2,2},
dp_nominal={5,10,15},
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState) "Splitter";
Buildings.Fluid.Sources.Boundary_pT bou1(
redeclare package Medium = Medium,
T=273.15 + 10,
use_p_in=true,
nPorts=1) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_pT bou2(
redeclare package Medium = Medium,
T=273.15 + 20,
p(displayUnit="Pa") = 101325,
nPorts=1) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_pT bou3(
redeclare package Medium = Medium,
T=273.15 + 30,
use_p_in=true,
nPorts=1) "Pressure boundary condition";
Modelica.Blocks.Sources.Ramp P1(
offset=101320,
height=10,
duration=20,
startTime=20) "Ramp pressure signal";
Modelica.Blocks.Sources.Ramp P3(
offset=101320,
height=10,
duration=20,
startTime=70) "Ramp pressure signal";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem1(redeclare package Medium
= Medium, m_flow_nominal=1) "Temperature sensor";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem2(redeclare package Medium
= Medium, m_flow_nominal=2) "Temperature sensor";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem3(redeclare package Medium
= Medium, m_flow_nominal=3) "Temperature sensor";
equation
connect(P1.y, bou1.p_in);
connect(bou3.p_in, P3.y);
connect(bou3.ports[1], senTem3.port_a);
connect(senTem3.port_b, spl.port_3);
connect(bou1.ports[1], senTem1.port_a);
connect(senTem1.port_b, spl.port_1);
connect(spl.port_2, senTem2.port_a);
connect(senTem2.port_b, bou2.ports[1]);
end FlowJunctionSteadyState;
Buildings.Fluid.FixedResistances.Validation.FlowJunctionSteadyStateNoPressureDrop
Test model for the three way splitter/mixer model configured as steady-state
Information
This model validates the use of the splitter and mixer model for different flow directions. The example is configured such that the flow changes its direction in each flow leg between t = 0 seconds to t = 100 seconds. The splitter model has been configured as a steady-state model, with no flow resistance.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
model FlowJunctionSteadyStateNoPressureDrop
"Test model for the three way splitter/mixer model configured as steady-state"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air "Medium model";
Buildings.Fluid.FixedResistances.Junction spl(
redeclare package Medium = Medium,
m_flow_nominal={2,2,2},
energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState,
dp_nominal={0,0,0}) "Splitter";
Buildings.Fluid.Sources.MassFlowSource_T bou1(
redeclare package Medium = Medium,
T=273.15 + 10,
nPorts=1,
use_m_flow_in=true) "Mass flow boundary condition";
Buildings.Fluid.Sources.Boundary_pT bou2(
redeclare package Medium = Medium,
T=273.15 + 20,
p(displayUnit="Pa") = 101325,
nPorts=1) "Pressure boundary condition";
Buildings.Fluid.Sources.MassFlowSource_T bou3(
redeclare package Medium = Medium,
T=273.15 + 30,
nPorts=1,
use_m_flow_in=true) "Mass flow boundary condition";
Modelica.Blocks.Sources.Ramp m1_flow(
duration=20,
startTime=20,
height=1,
offset=-1) "Ramp mass flow signal";
Modelica.Blocks.Sources.Ramp m3_flow(
height=1,
duration=20,
startTime=70,
offset=1) "Ramp mass flow signal";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem1(redeclare package Medium
= Medium, m_flow_nominal=1) "Temperature sensor";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem2(redeclare package Medium
= Medium, m_flow_nominal=2) "Temperature sensor";
Buildings.Fluid.Sensors.TemperatureTwoPort senTem3(redeclare package Medium
= Medium, m_flow_nominal=3) "Temperature sensor";
equation
connect(bou3.ports[1], senTem3.port_a);
connect(senTem3.port_b, spl.port_3);
connect(bou1.ports[1], senTem1.port_a);
connect(senTem1.port_b, spl.port_1);
connect(spl.port_2, senTem2.port_a);
connect(senTem2.port_b, bou2.ports[1]);
connect(m1_flow.y, bou1.m_flow_in);
connect(m3_flow.y, bou3.m_flow_in);
end FlowJunctionSteadyStateNoPressureDrop;
Buildings.Fluid.FixedResistances.Validation.LosslessPipe
Validation model for lossless pipe
Information
Validation model for a the pipe model with no friction and no heat loss.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
model LosslessPipe "Validation model for lossless pipe"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air "Medium model";
Modelica.Blocks.Sources.Ramp m_flow(
duration=1,
offset=-1,
height=2) "Mass flow source";
Buildings.Fluid.Sources.MassFlowSource_T sou(
redeclare package Medium = Medium,
nPorts=1,
use_m_flow_in=true,
T=273.15 + 20) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_pT sin(
redeclare package Medium = Medium,
T=273.15 + 10,
nPorts=1,
p(displayUnit="Pa") = 101325) "Pressure boundary condition";
Buildings.Fluid.FixedResistances.LosslessPipe res(
redeclare package Medium = Medium,
show_T=true,
m_flow_nominal=1) "Fixed resistance";
equation
connect(sou.ports[1], res.port_a);
connect(res.port_b, sin.ports[1]);
connect(m_flow.y, sou.m_flow_in);
end LosslessPipe;
Buildings.Fluid.FixedResistances.Validation.PressureDropsExplicit
Test of multiple resistances in series
Information
This model tests multiple flow resistances in series.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
model PressureDropsExplicit "Test of multiple resistances in series"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air "Medium model";
Buildings.Fluid.Sources.Boundary_ph sou(
redeclare package Medium = Medium,
nPorts=1,
p(displayUnit="Pa") = 101335,
use_p_in=true) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_ph sin(
redeclare package Medium = Medium,
nPorts=1,
use_p_in=false,
p=101325) "Pressure boundary condition";
Buildings.Fluid.FixedResistances.PressureDrop res11(
redeclare package Medium = Medium,
from_dp=false,
m_flow_nominal=2,
dp_nominal=5) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res12(
redeclare package Medium = Medium,
from_dp=false,
m_flow_nominal=2,
dp_nominal=5) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res22(
redeclare package Medium = Medium,
m_flow_nominal=2,
dp_nominal=5,
from_dp=true) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res21(
redeclare package Medium = Medium,
m_flow_nominal=2,
dp_nominal=5,
from_dp=true) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res31(
redeclare package Medium = Medium,
from_dp=false,
m_flow_nominal=2,
dp_nominal=5) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res32(
redeclare package Medium = Medium,
from_dp=false,
m_flow_nominal=2,
dp_nominal=5) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res42(
redeclare package Medium = Medium,
m_flow_nominal=2,
dp_nominal=5,
from_dp=true) "Flow resistance";
Buildings.Fluid.FixedResistances.PressureDrop res41(
redeclare package Medium = Medium,
m_flow_nominal=2,
dp_nominal=5,
from_dp=true) "Flow resistance";
Buildings.Fluid.Sources.MassFlowSource_h bou(
redeclare package Medium = Medium,
m_flow=1,
nPorts=1) "Mass flow boundary condition";
Buildings.Fluid.Sources.MassFlowSource_h bou1(
redeclare package Medium = Medium,
m_flow=1,
nPorts=1) "Mass flow boundary condition";
Buildings.Fluid.Sources.Boundary_pT sin1(
redeclare package Medium = Medium,
T=273.15 + 10,
nPorts=2,
use_p_in=false,
p=101325) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_ph sin2(
redeclare package Medium = Medium,
nPorts=1,
use_p_in=false,
p=101325) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_ph sou1(
redeclare package Medium = Medium,
nPorts=1,
p(displayUnit="Pa") = 101335,
use_p_in=true) "Pressure boundary condition";
Modelica.Blocks.Sources.Ramp P(
duration=1,
height=20,
offset=101315) "Signal source";
Buildings.Fluid.Sensors.MassFlowRate senMasFlo1(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Fluid.Sensors.MassFlowRate senMasFlo2(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Fluid.Sensors.MassFlowRate senMasFlo3(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Fluid.Sensors.MassFlowRate senMasFlo4(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Utilities.Diagnostics.AssertEquality assertEquality(threShold=1E-1)
"Assert equality of the two mass flow rates";
Buildings.Utilities.Diagnostics.AssertEquality assertEquality1(threShold=1E-1)
"Assert equality of the two mass flow rates";
equation
connect(res11.port_b, res12.port_a);
connect(res21.port_b, res22.port_a);
connect(res31.port_b, res32.port_a);
connect(res41.port_b, res42.port_a);
connect(sou.ports[1], res11.port_a);
connect(bou.ports[1], res31.port_a);
connect(bou1.ports[1], res41.port_a);
connect(sou1.ports[1], res21.port_a);
connect(P.y, sou.p_in);
connect(P.y, sou1.p_in);
connect(res12.port_b, senMasFlo1.port_a);
connect(res22.port_b, senMasFlo2.port_a);
connect(res32.port_b, senMasFlo3.port_a);
connect(res42.port_b, senMasFlo4.port_a);
connect(senMasFlo3.port_b, sin1.ports[1]);
connect(senMasFlo4.port_b, sin1.ports[2]);
connect(senMasFlo1.port_b, sin.ports[1]);
connect(senMasFlo2.port_b, sin2.ports[1]);
connect(senMasFlo3.m_flow, assertEquality1.u1);
connect(senMasFlo4.m_flow, assertEquality1.u2);
connect(senMasFlo1.m_flow, assertEquality.u1);
connect(senMasFlo2.m_flow, assertEquality.u2);
end PressureDropsExplicit;
Buildings.Fluid.FixedResistances.Validation.PressureDropsExplicitLinearized
Test of multiple linearized resistances in series
Information
This model tests multiple linearized flow resistances in series.
Extends from PressureDropsExplicit (Test of multiple resistances in series).
Modelica definition
model PressureDropsExplicitLinearized
"Test of multiple linearized resistances in series"
extends PressureDropsExplicit(
res11(linearized=true),
res12(linearized=true),
res21(linearized=true),
res22(linearized=true),
res31(linearized=true),
res32(linearized=true),
res41(linearized=true),
res42(linearized=true));
end PressureDropsExplicitLinearized;
Buildings.Fluid.FixedResistances.Validation.PressureDropsParallel
Test with multiple resistances in parallel
Information
This model tests two resistances in parallel.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Modelica definition
model PressureDropsParallel
"Test with multiple resistances in parallel"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Water "Medium model";
Modelica.Blocks.Sources.Ramp P(
duration=1,
height=20,
offset=101315) "Signal source";
Buildings.Fluid.FixedResistances.PressureDrop res1(
redeclare package Medium = Medium,
m_flow_nominal=5,
dp_nominal=10,
deltaM=0.3,
linearized=false,
from_dp=true) "Flow resistance";
Buildings.Fluid.Sources.Boundary_pT sou1(
redeclare package Medium = Medium,
nPorts=2,
use_p_in=true,
T=293.15) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_pT sin1(
redeclare package Medium = Medium,
nPorts=2,
p(displayUnit="Pa") = 101325,
T=283.15) "Pressure boundary condition";
Buildings.Fluid.FixedResistances.PressureDrop res2(
redeclare package Medium = Medium,
m_flow_nominal=5,
dp_nominal=10,
deltaM=0.3,
linearized=false,
from_dp=true) "Flow resistance";
Buildings.Fluid.Sensors.MassFlowRate masFlo2(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Utilities.Diagnostics.AssertEquality assEqu(message="Inputs differ, check that lossless pipe is correctly implemented.",
threShold=1E-4) "Assert equality of the two mass flow rates";
Buildings.Fluid.Sensors.MassFlowRate masFlo1(redeclare package Medium = Medium)
"Mass flow rate sensor";
equation
connect(P.y, sou1.p_in);
connect(res2.port_b, masFlo2.port_a);
connect(res1.port_b, masFlo1.port_a);
connect(sou1.ports[1], res1.port_a);
connect(sou1.ports[2], res2.port_a);
connect(sin1.ports[1], masFlo1.port_b);
connect(sin1.ports[2], masFlo2.port_b);
connect(masFlo2.m_flow, assEqu.u1);
connect(masFlo1.m_flow, assEqu.u2);
end PressureDropsParallel;
Buildings.Fluid.FixedResistances.Validation.PressureDropsSeries
Test of multiple resistances in series
Information
This model tests multiple resistances in series.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nRes | 10 | Number of resistances |
| PressureDifference | dp_nominal | 5 | Nominal pressure drop for each resistance [Pa] |
Modelica definition
model PressureDropsSeries "Test of multiple resistances in series"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Air "Medium model";
parameter Integer nRes(min=2) = 10 "Number of resistances";
parameter Modelica.SIunits.PressureDifference dp_nominal=5
"Nominal pressure drop for each resistance";
Modelica.Blocks.Sources.Ramp P(
duration=1,
height=2*dp_nominal*nRes,
offset=101325 - dp_nominal*nRes) "Signal source";
Buildings.Fluid.Sources.Boundary_pT sou(
redeclare package Medium = Medium,
T=273.15 + 20,
use_p_in=true,
nPorts=1) "Pressure boundary condition";
Buildings.Fluid.Sources.Boundary_pT sin(
redeclare package Medium = Medium,
T=273.15 + 10,
nPorts=1,
p(displayUnit="Pa") = 101325) "Pressure boundary condition";
Buildings.Fluid.FixedResistances.PressureDrop[nRes] res(
redeclare each package Medium = Medium,
each dp_nominal=dp_nominal,
each from_dp=false,
each m_flow_nominal=2) "Flow resistance";
equation
for i in 1:nRes - 1 loop
connect(res[i].port_b, res[i + 1].port_a);
end for;
connect(P.y, sou.p_in);
connect(sin.ports[1], res[nRes].port_b);
connect(sou.ports[1], res[1].port_a);
end PressureDropsSeries;