Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples

Information

This package contains examples for the use of models that can be found in Buildings.Examples.ChillerPlant.BaseClasses.Controls.

Package Content

Name	Description
ChillerSwitch	Test model for ChillerSwitch
ChillerSetPointControl	Test model for chiller setpoint control using TrimAndResponse and LinearPieceWiseTwo
KMinusU	Test model for KMinusU
LinearPiecewiseTwo	Test model for LinearPiecewiseTwo
RequestCounter	Test model for RequestCounter
TrimAndRespond	Test model for TrimAndRespond
WSEControl	Test model for WSEControl

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.ChillerSwitch

Information

Modelica definition

model ChillerSwitch "Test model for ChillerSwitch"
  extends Modelica.Icons.Example;
  Modelica.Blocks.Sources.Sine TSet(
    freqHz=0.0002,
    offset=12,
    amplitude=8);
  Modelica.Blocks.Sources.Sine CHWST(
    freqHz=0.0001,
    amplitude=5,
    offset=15);
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.ChillerSwitch chiSwi(
      deaBan(displayUnit="K") = 3);
equation 
  connect(TSet.y, chiSwi.TSet);
  connect(CHWST.y, chiSwi.chiCHWST);
end ChillerSwitch;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.ChillerSetPointControl

Information

Parameters

Type	Name	Default	Description
MassFlowRate	mAir_flow_nominal	61.6*2	Nominal mass flow rate at fan [kg/s]
Real	COPc_nominal	3	Chiller COP
MassFlowRate	mCHW_flow_nominal	15.2	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	mCHW_flow_nominal/COPc_nomin...	Nominal mass flow rate at condenser water [kg/s]
Real	QRoo	100

Modelica definition

model ChillerSetPointControl 
  "Test model for chiller setpoint control using TrimAndResponse and LinearPieceWiseTwo"
  extends Modelica.Icons.Example;
  package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
  package Medium2 = Buildings.Media.ConstantPropertyLiquidWater;
  package MediumAir = Buildings.Media.GasesPTDecoupled.SimpleAir "Medium model";
  parameter Modelica.SIunits.MassFlowRate mAir_flow_nominal=61.6*2 
    "Nominal mass flow rate at fan";
  parameter Real COPc_nominal=3 "Chiller COP";
  parameter Modelica.SIunits.MassFlowRate mCHW_flow_nominal=15.2 
    "Nominal mass flow rate at chilled water";
  parameter Modelica.SIunits.MassFlowRate mCW_flow_nominal=mCHW_flow_nominal/
      COPc_nominal*(COPc_nominal + 1) 
    "Nominal mass flow rate at condenser water";
  parameter Real QRoo=100;
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.TrimAndRespond triAndRes(
    yEqu0=0.1,
    uTri=0.8,
    yDec=-0.03,
    yInc=0.03,
    samplePeriod=120);
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.LinearPiecewiseTwo
    linPieTwo(
    x0=0,
    x2=1,
    y20=273.15 + 12.78,
    y21=273.15 + 7.22,
    x1=0.5,
    y10=0.1,
    y11=1);
  Buildings.Fluid.Chillers.ElectricEIR chi(
    dp1_nominal=6000,
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=mCW_flow_nominal,
    m2_flow_nominal=mCHW_flow_nominal,
    dp2_nominal=3000,
    per=Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_York_YK_1881kW_6_53COP_Vanes(),
    m1_flow(fixed=true, start=mCW_flow_nominal),
    m2_flow(fixed=true, start=mCHW_flow_nominal),
    energyDynamics=Modelica.Fluid.Types.Dynamics.DynamicFreeInitial,
    massDynamics=Modelica.Fluid.Types.Dynamics.DynamicFreeInitial);

  Buildings.Fluid.HeatExchangers.ConstantEffectiveness coi(
    redeclare package Medium1 = Medium2,
    m1_flow_nominal=mCHW_flow_nominal,
    dp1_nominal=3000,
    dp2_nominal=3000,
    redeclare package Medium2 = MediumAir,
    m2_flow_nominal=mAir_flow_nominal,
    eps=1.0);
  Buildings.Fluid.Sources.FixedBoundary sin1(redeclare package Medium = Medium1,
      nPorts=1);
  Buildings.Fluid.Sources.MassFlowSource_T sou1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_T_in=false,
    m_flow=mCW_flow_nominal,
    T=283.15);
  inner Modelica.Fluid.System system;
  Modelica.Blocks.Sources.Constant const(k=273.15 + 20);
  Buildings.Controls.Continuous.LimPID limPID(
    reverseAction=true,
    y_start=1,
    yMin=0,
    k=10,
    Ti=0.01,
    Td=10);
  Buildings.Fluid.Sensors.TemperatureTwoPort TRet(redeclare package Medium =
        MediumAir, m_flow_nominal=999);
  Buildings.Fluid.Movers.FlowMachine_m_flow pum(
    m_flow_nominal=1.2*mCHW_flow_nominal,
    dp(start=40474),
    redeclare package Medium = Medium2,
    init=Modelica.Blocks.Types.Init.NoInit) "Chilled water pump";
  Buildings.Fluid.Storage.ExpansionVessel expVesChi(VTot=1, redeclare package
      Medium = Medium2);
  Modelica.Blocks.Sources.BooleanConstant booleanConstant1(k=true);
  Modelica.Blocks.Math.Gain gain(k=mCHW_flow_nominal);
  Buildings.Fluid.Sources.MassFlowSource_T sou2(
    use_T_in=true,
    redeclare package Medium = MediumAir,
    m_flow=mAir_flow_nominal,
    T=291.15,
    nPorts=1);
  Buildings.Fluid.Sources.FixedBoundary sin2(redeclare package Medium =
        MediumAir, nPorts=1);
  Modelica.Blocks.Sources.Sine sine(
    amplitude=5,
    offset=273.15 + 25,
    freqHz=1/20000);
  Modelica.Blocks.Continuous.FirstOrder firstOrder1(y_start=273.15 + 10, T=chi.tau1
        /2);
  Buildings.Fluid.Sensors.TemperatureTwoPort TSup(redeclare package Medium =
        MediumAir, m_flow_nominal=999);
equation 
  connect(sou1.ports[1], chi.port_a1);
  connect(coi.port_a1, chi.port_b2);
  connect(TRet.T, limPID.u_m);
  connect(chi.port_a2, pum.port_b);
  connect(pum.port_a, coi.port_b1);
  connect(chi.port_a2, expVesChi.port_a);
  connect(booleanConstant1.y, chi.on);
  connect(gain.y, pum.m_flow_in);
  connect(sou2.T_in, sine.y);
  connect(chi.port_b1, sin1.ports[1]);
  connect(const.y, limPID.u_s);
  connect(TRet.port_b, coi.port_b2);
  connect(TRet.port_a, sin2.ports[1]);
  connect(linPieTwo.y[2], firstOrder1.u);
  connect(firstOrder1.y, chi.TSet);
  connect(coi.port_a2, TSup.port_a);
  connect(TSup.port_b, sou2.ports[1]);
  connect(linPieTwo.y[1], gain.u);
  connect(limPID.y, triAndRes.u);
  connect(triAndRes.y, linPieTwo.u);
end ChillerSetPointControl;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.KMinusU

Information

Modelica definition

model KMinusU "Test model for KMinusU"
  extends Modelica.Icons.Example;
  Modelica.Blocks.Sources.Sine pulse(
    freqHz=0.001,
    amplitude=0.5,
    offset=0.5,
    phase=-1.5707963267949);
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.KMinusU kMinU(k=1);
equation 
  connect(pulse.y, kMinU.u);
end KMinusU;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.LinearPiecewiseTwo

Information

Modelica definition

model LinearPiecewiseTwo "Test model for LinearPiecewiseTwo"
  extends Modelica.Icons.Example;
  Modelica.Blocks.Sources.Sine pulse(
    freqHz=0.001,
    amplitude=0.5,
    offset=0.5,
    phase=-1.5707963267949);
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.LinearPiecewiseTwo
    linPieTwo(
    x0=0,
    x1=0.5,
    x2=1,
    y10=5,
    y11=15,
    y20=55,
    y21=42);
equation 
  connect(pulse.y, linPieTwo.u);
end LinearPiecewiseTwo;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.RequestCounter

Information

Modelica definition

model RequestCounter "Test model for RequestCounter"
  extends Modelica.Icons.Example;
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.RequestCounter reqCou(
      nAct=3, uTri=0.8);
  Modelica.Blocks.Sources.Constant act3(k=0.95);
  Modelica.Blocks.Sources.Pulse act1(period=10);
  Modelica.Blocks.Sources.Sine act2(freqHz=0.3, offset=1);
equation 
  connect(act1.y, reqCou.uAct[1]);
  connect(act2.y, reqCou.uAct[2]);
  connect(act3.y, reqCou.uAct[3]);
end RequestCounter;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.TrimAndRespond

Information

Modelica definition

model TrimAndRespond "Test model for TrimAndRespond"
  extends Modelica.Icons.Example;

  Modelica.Blocks.Sources.Sine act3(freqHz=0.002, offset=0.2);
  Modelica.Blocks.Sources.Pulse act1(period=500);
  Modelica.Blocks.Sources.Sine act2(freqHz=0.001, offset=0.3);
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.TrimAndRespond triAndRes[3](
    each uTri=0.9,
    each yEqu0=0.1,
    each yDec=-0.01,
    each yInc=0.02,
    each samplePeriod=20);
equation 
  connect(act1.y, triAndRes[1].u);
  connect(act2.y, triAndRes[2].u);
  connect(act3.y, triAndRes[3].u);
end TrimAndRespond;

Buildings.Examples.ChillerPlant.BaseClasses.Controls.Examples.WSEControl

Information

Modelica definition

model WSEControl "Test model for WSEControl"
  extends Modelica.Icons.Example;
  Modelica.Blocks.Sources.Pulse wseCHWST(
    period=300,
    amplitude=15,
    offset=273.15 + 5) "WSE chilled water supply temperature";
  Modelica.Blocks.Sources.Constant wseCWST(k=273.15 + 10) 
    "WSE condenser water supply temperature";
  Buildings.Examples.ChillerPlant.BaseClasses.Controls.WSEControl wseCon 
    "Controller for the water-side economizer";
  Modelica.Blocks.Sources.Constant TWetBub(k=273.15 + 5) "Wet bulb temperature";
  Modelica.Blocks.Sources.Constant TTowApp(k=5) "Cooling tower approach";
equation 
  connect(TWetBub.y, wseCon.TWetBul);
  connect(TTowApp.y, wseCon.towTApp);
  connect(wseCHWST.y, wseCon.wseCHWST);
  connect(wseCWST.y, wseCon.wseCWST);
end WSEControl;