Buildings.DHC.Plants.Combined.Subsystems.Validation.BaseClasses
Package with base classes
Information
This package contains base classes that are used for validation purposes.
Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).
Package Content
| Name | Description |
|---|---|
 PartialMultiplePumps
|
Base class for validating the multiple pumps model |
Buildings.DHC.Plants.Combined.Subsystems.Validation.BaseClasses.PartialMultiplePumps
Base class for validating the multiple pumps model
Information
This base class is used to construct validation models for the various multiple-pump models within Buildings.DHC.Plants.Combined.Subsystems.
Extends from Modelica.Icons.Example (Icon for runnable examples).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | nPum | 2 | Number of pumps |
| Pressure | p_min | 2E5 | Circuit minimum pressure [Pa] |
| PressureDifference | dp_nominal | dpPum_nominal | Circuit total pressure drop at design conditions [Pa] |
| MultiplePumpsSpeed | pum | redeclare Buildings.DHC.Plan... | Multiple pumps in parallel - Speed controlled |
| SpeedControlled_y | pum1 | redeclare Fluid.Movers.Speed... | Pump |
| SpeedControlled_y | pum2 | redeclare Fluid.Movers.Speed... | Pump |
| Nominal condition | |||
| MassFlowRate | mPum_flow_nominal | 1 | Pump mass flow rate (each pump) [kg/s] |
| PressureDifference | dpPum_nominal | 1E5 | Pump head (each pump) [Pa] |
Modelica definition
partial model PartialMultiplePumps
"Base class for validating the multiple pumps model"
extends Modelica.Icons.Example;
package Medium = Buildings.Media.Water
"Medium model for hot water";
parameter Integer nPum(
final min=1)=2
"Number of pumps";
parameter Modelica.Units.SI.MassFlowRate mPum_flow_nominal=1
"Pump mass flow rate (each pump)";
parameter Modelica.Units.SI.PressureDifference dpPum_nominal = 1E5
"Pump head (each pump)";
final parameter Modelica.Units.SI.MassFlowRate m_flow_nominal=
nPum * mPum_flow_nominal
"Circuit mass flow rate at design conditions";
parameter Modelica.Units.SI.Pressure p_min = 2E5
"Circuit minimum pressure";
parameter Modelica.Units.SI.PressureDifference dp_nominal = dpPum_nominal
"Circuit total pressure drop at design conditions";
Fluid.Sources.Boundary_pT bou(
redeclare final package Medium = Medium,
final p=p_min,
nPorts=2)
"Pressure boundary condition";
replaceable Buildings.DHC.Plants.Combined.Subsystems.MultiplePumpsSpeed pum
constrainedby Buildings.DHC.Plants.Combined.Subsystems.BaseClasses.PartialMultiplePumps
(
redeclare final package Medium = Medium,
final nPum=nPum,
final mPum_flow_nominal=mPum_flow_nominal,
final dpPum_nominal=dpPum_nominal,
use_riseTime=false,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial)
"Multiple pumps in parallel - Speed controlled";
Fluid.Sensors.RelativePressure senRelPre(redeclare package Medium = Medium)
"Differential pressure sensor";
Fluid.Sensors.MassFlowRate senMasFlo(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Controls.OBC.CDL.Reals.Sources.Ramp ope(
height=0.8,
duration=300,
offset=0.2,
startTime=200)
"Valve opening signal";
Fluid.Actuators.Valves.TwoWayEqualPercentage val(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dpValve_nominal=5000,
dpFixed_nominal=dp_nominal - val.dpValve_nominal)
"Modulating valve";
Buildings.Controls.OBC.CDL.Logical.Sources.TimeTable y1Pum(
table=[0,0,0; 1,0,0; 1,1,0; 4,1,1; 4,1,1; 10,1,1],
timeScale=100,
period=1000) "Pump Start signal";
replaceable Fluid.Movers.SpeedControlled_y pum1 constrainedby Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine
(
redeclare final package Medium = Medium,
final energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
use_riseTime=false,
final per=pum.per,
addPowerToMedium=false) "Pump";
Fluid.FixedResistances.CheckValve cheVal1(
redeclare final package Medium = Medium,
final m_flow_nominal=mPum_flow_nominal,
final dpValve_nominal=pum.dpValve_nominal)
"Check valve";
replaceable Fluid.Movers.SpeedControlled_y pum2 constrainedby Buildings.Fluid.Movers.BaseClasses.PartialFlowMachine
(
redeclare final package Medium = Medium,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
use_riseTime=false,
final per=pum.per,
addPowerToMedium=false) "Pump";
Fluid.FixedResistances.CheckValve cheVal2(
redeclare final package Medium = Medium,
final m_flow_nominal=mPum_flow_nominal,
final dpValve_nominal=pum.dpValve_nominal)
"Check valve";
Fluid.Actuators.Valves.TwoWayEqualPercentage val1(
redeclare package Medium = Medium,
m_flow_nominal=m_flow_nominal,
dpValve_nominal=5000,
dpFixed_nominal=dp_nominal - val.dpValve_nominal)
"Modulating valve";
Buildings.Controls.OBC.CDL.Conversions.BooleanToReal booToRea[2]
"Convert to real";
Fluid.Sensors.RelativePressure senRelPre1(redeclare package Medium = Medium)
"Differential pressure sensor";
Fluid.Sensors.MassFlowRate senMasFlo1(redeclare package Medium = Medium)
"Mass flow rate sensor";
Buildings.Controls.OBC.CDL.Reals.Multiply inp1
"Compute pump input signal";
Buildings.Controls.OBC.CDL.Reals.Multiply inp2
"Compute pump input signal";
equation
connect(bou.ports[1], pum.port_a);
connect(val.port_b, pum.port_a);
connect(pum.port_b, senRelPre.port_a);
connect(ope.y, val.y);
connect(y1Pum.y, pum.y1);
connect(pum.port_b, senMasFlo.port_a);
connect(senMasFlo.port_b, val.port_a);
connect(senRelPre.port_b, pum.port_a);
connect(pum1.port_b, cheVal1.port_a);
connect(pum2.port_b, cheVal2.port_a);
connect(val1.port_b, pum2.port_a);
connect(val1.port_b, pum1.port_a);
connect(val1.port_b, bou.ports[2]);
connect(y1Pum.y, booToRea.u);
connect(cheVal2.port_b, senMasFlo1.port_a);
connect(senMasFlo1.port_b, val1.port_a);
connect(cheVal1.port_b, senMasFlo1.port_a);
connect(senRelPre1.port_a, senMasFlo1.port_a);
connect(senRelPre1.port_b, pum2.port_a);
connect(booToRea[1].y, inp1.u2);
connect(ope.y, val1.y);
connect(booToRea[2].y, inp2.u2);
end PartialMultiplePumps;