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Buildings.Examples.VAVReheat.Controls

Package with controller models

Information

Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).

Package Content

NameDescription
Buildings.Examples.VAVReheat.Controls.ControlBus ControlBus Empty control bus that is adapted to the signals connected to it
Buildings.Examples.VAVReheat.Controls.Economizer Economizer Controller for economizer
Buildings.Examples.VAVReheat.Controls.Examples Examples Example models to test the components
Buildings.Examples.VAVReheat.Controls.FanVFD FanVFD Controller for fan revolution
Buildings.Examples.VAVReheat.Controls.IntegerSum IntegerSum Sums all the integer signals
Buildings.Examples.VAVReheat.Controls.ModeSelector ModeSelector Finite State Machine for the operational modes
OperationModes Enumeration for modes of operation
Buildings.Examples.VAVReheat.Controls.PreCoolingStarter PreCoolingStarter Outputs true when precooling should start
Buildings.Examples.VAVReheat.Controls.RoomTemperatureSetpoint RoomTemperatureSetpoint Set point scheduler for room temperature
Buildings.Examples.VAVReheat.Controls.RoomVAV RoomVAV Controller for room VAV box
Buildings.Examples.VAVReheat.Controls.State State Block that outputs the mode if the state is active, or zero otherwise
Buildings.Examples.VAVReheat.Controls.UnoccupiedOn UnoccupiedOn Controller for unoccupied on state
Buildings.Examples.VAVReheat.Controls.DuctStaticPressureSetpoint DuctStaticPressureSetpoint Computes the duct static pressure setpoint
Buildings.Examples.VAVReheat.Controls.CoolingCoilTemperatureSetpoint CoolingCoilTemperatureSetpoint Set point scheduler for cooling coil
Buildings.Examples.VAVReheat.Controls.MixedAirTemperatureSetpoint MixedAirTemperatureSetpoint Mixed air temperature setpoint for economizer
Buildings.Examples.VAVReheat.Controls.EconomizerTemperatureControl EconomizerTemperatureControl Controller for economizer mixed air temperature

Types and constants

  type OperationModes = enumeration(
    occupied "Occupied",
    unoccupiedOff "Unoccupied off",
    unoccupiedNightSetBack "Unoccupied, night set back",
    unoccupiedWarmUp "Unoccupied, warm-up",
    unoccupiedPreCool "Unoccupied, pre-cool",
    safety "Safety (smoke, fire, etc.)") "Enumeration for modes of operation";


Buildings.Examples.VAVReheat.Controls.ControlBus Buildings.Examples.VAVReheat.Controls.ControlBus

Empty control bus that is adapted to the signals connected to it

Buildings.Examples.VAVReheat.Controls.ControlBus

Information

This connector defines the "expandable connector" ControlBus that is used as bus in the BusUsage example. Note, this connector is "empty". When using it, the actual content is constructed by the signals connected to this bus.

Extends from Modelica.Icons.SignalBus (Icon for signal bus).

Modelica definition

expandable connector ControlBus 
  "Empty control bus that is adapted to the signals connected to it"
  extends Modelica.Icons.SignalBus;
end ControlBus;

Buildings.Examples.VAVReheat.Controls.Economizer Buildings.Examples.VAVReheat.Controls.Economizer

Controller for economizer

Buildings.Examples.VAVReheat.Controls.Economizer

Parameters

TypeNameDefaultDescription
TemperatureDifferencedT1Temperture offset to activate economizer [K]
VolumeFlowRateVOut_flow_min Minimum outside air volume flow rate [m3/s]
Realk1Gain of controller
TimeTi Time constant of Integrator block [s]

Connectors

TypeNameDescription
input RealInputTSupHeaSetSupply temperature setpoint for heating
input RealInputTSupCooSetSupply temperature setpoint for cooling
input RealInputTMixMeasured mixed air temperature
ControlBuscontrolBus 
input RealInputVOut_flowMeasured outside air flow rate
input RealInputTRetReturn air temperature
output RealOutputyOAControl signal for outside air damper

Modelica definition

block Economizer "Controller for economizer"
  import Buildings.Examples.VAVReheat.Controls.OperationModes;
  parameter Modelica.SIunits.TemperatureDifference dT(min=0.1)= 1 
    "Temperture offset to activate economizer";
  parameter Modelica.SIunits.VolumeFlowRate VOut_flow_min(min=0) 
    "Minimum outside air volume flow rate";
  Modelica.Blocks.Interfaces.RealInput TSupHeaSet 
    "Supply temperature setpoint for heating";
  Modelica.Blocks.Interfaces.RealInput TSupCooSet 
    "Supply temperature setpoint for cooling";
  Modelica.Blocks.Interfaces.RealInput TMix "Measured mixed air temperature";
  ControlBus controlBus;
  Modelica.Blocks.Interfaces.RealInput VOut_flow 
    "Measured outside air flow rate";
  Modelica.Blocks.Interfaces.RealInput TRet "Return air temperature";
  Modelica.Blocks.Math.Gain gain(k=1/VOut_flow_min) "Normalize mass flow rate";
  Buildings.Controls.Continuous.LimPID conV_flow(
    controllerType=Modelica.Blocks.Types.SimpleController.PI,
    k=k,
    Ti=Ti,
    yMax=0.995,
    yMin=0.005,
    Td=60) "Controller for outside air flow rate";
  Modelica.Blocks.Sources.Constant uni(k=1) "Unity signal";
  parameter Real k=1 "Gain of controller";
  parameter Modelica.SIunits.Time Ti "Time constant of Integrator block";
  Modelica.Blocks.Interfaces.RealOutput yOA 
    "Control signal for outside air damper";
  Modelica.Blocks.Routing.Extractor extractor(nin=6);
  Modelica.Blocks.Sources.Constant closed(k=0) "Signal to close OA damper";
  Modelica.Blocks.Math.Max max 
    "Takes bigger signal (OA damper opens for temp. control or for minimum outside air)";
  MixedAirTemperatureSetpoint TSetMix "Mixed air temperature setpoint";
  EconomizerTemperatureControl yOATMix(Ti=Ti, k=k) 
    "Control signal for outdoor damper to track mixed air temperature setpoint";
  EconomizerTemperatureControl yOATFre(Ti=Ti, k=k) 
    "Control signal for outdoor damper to track freeze temperature setpoint";
  Modelica.Blocks.Math.Min min 
    "Takes bigger signal (OA damper opens for temp. control or for minimum outside air)";
  Modelica.Blocks.Sources.Constant TFre(k=273.15 + 3) 
    "Setpoint for freeze protection";
equation 
  connect(VOut_flow, gain.u);
  connect(gain.y, conV_flow.u_m);
  connect(uni.y, conV_flow.u_s);
  connect(controlBus.controlMode, extractor.index);
  connect(max.y, extractor.u[OperationModes.occupied]);
  connect(closed.y, extractor.u[OperationModes.unoccupiedOff]);
  connect(closed.y, extractor.u[OperationModes.unoccupiedNightSetBack]);
  connect(max.y, extractor.u[OperationModes.unoccupiedWarmUp]);
  connect(max.y, extractor.u[OperationModes.unoccupiedPreCool]);
  connect(closed.y, extractor.u[OperationModes.safety]);
  connect(TSupHeaSet, TSetMix.TSupHeaSet);
  connect(TSupCooSet, TSetMix.TSupCooSet);
  connect(controlBus, TSetMix.controlBus);
  connect(yOATMix.TRet, TRet);
  connect(controlBus.TOut, yOATMix.TOut);
  connect(yOATMix.TMix, TMix);
  connect(yOATMix.TMixSet, TSetMix.TSet);
  connect(yOATMix.yOA, max.u1);
  connect(min.u2, conV_flow.y);
  connect(min.y, max.u2);
  connect(min.u1, yOATFre.yOA);
  connect(yOATFre.TRet, TRet);
  connect(controlBus.TOut, yOATFre.TOut);
  connect(yOATFre.TMix, TMix);
  connect(TFre.y, yOATFre.TMixSet);
  connect(extractor.y, yOA);
end Economizer;

Buildings.Examples.VAVReheat.Controls.FanVFD Buildings.Examples.VAVReheat.Controls.FanVFD

Controller for fan revolution

Buildings.Examples.VAVReheat.Controls.FanVFD

Information

Extends from Modelica.Blocks.Interfaces.SISO (Single Input Single Output continuous control block).

Parameters

TypeNameDefaultDescription
RealxSet_nominal Nominal setpoint (used for normalization)
Realr_N_min0.01Minimum normalized fan speed
InitinitTypeModelica.Blocks.Types.Init.N...Type of initialization (1: no init, 2: steady state, 3/4: initial output)
Realy_start0Initial or guess value of output (= state)

Connectors

TypeNameDescription
input RealInputuConnector of Real input signal
output RealOutputyConnector of Real output signal
ControlBuscontrolBus 
input RealInputu_mConnector of measurement input signal

Modelica definition

block FanVFD "Controller for fan revolution"
  extends Modelica.Blocks.Interfaces.SISO;
  import Buildings.Examples.VAVReheat.Controls.OperationModes;
  Buildings.Controls.Continuous.LimPID con(
    yMax=1,
    yMin=0,
    controllerType=Modelica.Blocks.Types.SimpleController.PI,
    Td=60,
    k=0.5,
    Ti=15) "Controller";
  Modelica.Blocks.Math.Gain gaiMea(k=1/xSet_nominal) 
    "Gain to normalize measurement signal";
  parameter Real xSet_nominal "Nominal setpoint (used for normalization)";
  ControlBus controlBus;
  Modelica.Blocks.Routing.Extractor extractor(nin=6);
  Modelica.Blocks.Sources.Constant off(k=r_N_min) "Off signal";
  Modelica.Blocks.Sources.Constant on(k=1) "On signal";
  Modelica.Blocks.Math.Gain gaiSet(k=1/xSet_nominal) 
    "Gain to normalize setpoint signal";
  Modelica.Blocks.Interfaces.RealInput u_m 
    "Connector of measurement input signal";
  parameter Real r_N_min=0.01 "Minimum normalized fan speed";
  parameter Modelica.Blocks.Types.Init initType=Modelica.Blocks.Types.Init.NoInit 
    "Type of initialization (1: no init, 2: steady state, 3/4: initial output)";
  parameter Real y_start=0 "Initial or guess value of output (= state)";

equation 
  connect(gaiMea.y, con.u_m);
  connect(con.y, extractor.u[OperationModes.occupied]);
  connect(con.y, extractor.u[OperationModes.unoccupiedWarmUp]);
  connect(con.y, extractor.u[OperationModes.unoccupiedPreCool]);
  connect(off.y, extractor.u[OperationModes.unoccupiedOff]);
  connect(off.y, extractor.u[OperationModes.safety]);
  connect(on.y, extractor.u[OperationModes.unoccupiedNightSetBack]);
  connect(controlBus.controlMode, extractor.index);
  connect(gaiSet.y, con.u_s);
  connect(u_m, gaiMea.u);
  connect(gaiSet.u, u);
  connect(extractor.y, y);
end FanVFD;

Buildings.Examples.VAVReheat.Controls.IntegerSum Buildings.Examples.VAVReheat.Controls.IntegerSum

Sums all the integer signals

Buildings.Examples.VAVReheat.Controls.IntegerSum

Information

Extends from Modelica.Blocks.Interfaces.IntegerSO (Single Integer Output continuous control block).

Parameters

TypeNameDefaultDescription
Integernin Number of inputs

Connectors

TypeNameDescription
output IntegerOutputyConnector of Integer output signal
input IntegerInputu[nin]Input signal

Modelica definition

block IntegerSum "Sums all the integer signals"
  extends Modelica.Blocks.Interfaces.IntegerSO;
  parameter Integer nin "Number of inputs";
  Modelica.Blocks.Interfaces.IntegerInput u[nin] "Input signal";
equation 
  y = sum(u);
end IntegerSum;

Buildings.Examples.VAVReheat.Controls.ModeSelector Buildings.Examples.VAVReheat.Controls.ModeSelector

Finite State Machine for the operational modes

Buildings.Examples.VAVReheat.Controls.ModeSelector

Parameters

TypeNameDefaultDescription
TemperatureDifferencedelTRooOnOff1Deadband in room temperature between occupied on and occupied off [K]
TemperatureTRooSetHeaOcc293.15Set point for room air temperature during heating mode [K]
TemperatureTRooSetCooOcc299.15Set point for room air temperature during cooling mode [K]
TemperatureTSetHeaCoiOut303.15Set point for air outlet temperature at central heating coil [K]

Connectors

TypeNameDescription
ControlBuscb 

Modelica definition

model ModeSelector "Finite State Machine for the operational modes"

  Modelica.StateGraph.InitialStep initialStep;
  Modelica.StateGraph.Transition start "Starts the system";
  State unOccOff(
    mode=Buildings.Examples.VAVReheat.Controls.OperationModes.unoccupiedOff,
    nIn=3,
    nOut=4) "Unoccupied off mode, no coil protection";
  State unOccNigSetBac(
    nOut=2,
    mode=Buildings.Examples.VAVReheat.Controls.OperationModes.unoccupiedNightSetBack,
    nIn=1) "Unoccupied night set back";
  Modelica.StateGraph.Transition t2(condition=TRooMinErrHea.y > 0,
    enableTimer=true,
    waitTime=60);
  parameter Modelica.SIunits.TemperatureDifference delTRooOnOff(min=0.1)=1 
    "Deadband in room temperature between occupied on and occupied off";
  parameter Modelica.SIunits.Temperature TRooSetHeaOcc=293.15 
    "Set point for room air temperature during heating mode";
  parameter Modelica.SIunits.Temperature TRooSetCooOcc=299.15 
    "Set point for room air temperature during cooling mode";
  parameter Modelica.SIunits.Temperature TSetHeaCoiOut=303.15 
    "Set point for air outlet temperature at central heating coil";
  Modelica.StateGraph.Transition t1(condition=delTRooOnOff < -TRooMinErrHea.y);
  inner Modelica.StateGraph.StateGraphRoot stateGraphRoot;
  ControlBus cb;
  Modelica.Blocks.Routing.RealPassThrough TRooSetHea 
    "Current heating setpoint temperature";
  State morWarUp(mode=Buildings.Examples.VAVReheat.Controls.OperationModes.unoccupiedWarmUp,
                                                                            nIn=2,
    nOut=1) "Morning warm up";
  Modelica.StateGraph.TransitionWithSignal t6(enableTimer=true, waitTime=60);
  Modelica.Blocks.Logical.LessEqualThreshold occThrSho(threshold=1800) 
    "Signal to allow transition into morning warmup";
  Modelica.StateGraph.TransitionWithSignal t5;
  State occ(       mode=Buildings.Examples.VAVReheat.Controls.OperationModes.occupied,
                                                                      nIn=3) 
    "Occupied mode";
  Modelica.Blocks.Routing.RealPassThrough TRooMin;
  Modelica.Blocks.Math.Feedback TRooMinErrHea "Room control error for heating";
  Modelica.StateGraph.Transition t3(condition=TRooMin.y > TRooSetHeaOcc or 
        occupied.y);
  Modelica.Blocks.Routing.BooleanPassThrough occupied 
    "outputs true if building is occupied";
  Modelica.StateGraph.TransitionWithSignal t4(enableTimer=false);
  State morPreCoo(                                                        nIn=2,
    mode=Buildings.Examples.VAVReheat.Controls.OperationModes.unoccupiedPreCool,
    nOut=1) "Pre-cooling mode";
  Modelica.StateGraph.Transition t7(condition=TRooMin.y < TRooSetCooOcc or 
        occupied.y);
  Modelica.Blocks.Logical.And and1;
  Modelica.Blocks.Routing.RealPassThrough TRooAve "Average room temperature";
  Modelica.Blocks.Sources.BooleanExpression booleanExpression(y=TRooAve.y <
        TRooSetCooOcc);
  PreCoolingStarter preCooSta(TRooSetCooOcc=TRooSetCooOcc) 
    "Model to start pre-cooling";
  Modelica.StateGraph.TransitionWithSignal t9;
  Modelica.Blocks.Logical.Not not1;
  Modelica.Blocks.Logical.And and2;
  Modelica.Blocks.Logical.Not not2;
  Modelica.StateGraph.TransitionWithSignal t8 
    "changes to occupied in case precooling is deactivated";
  Modelica.Blocks.MathInteger.Sum sum(nu=5);
equation 
  connect(start.outPort, unOccOff.inPort[1]);
  connect(initialStep.outPort[1], start.inPort);
  connect(unOccOff.outPort[1], t2.inPort);
  connect(t2.outPort, unOccNigSetBac.inPort[1]);
  connect(unOccNigSetBac.outPort[1], t1.inPort);
  connect(t1.outPort, unOccOff.inPort[2]);
  connect(cb.dTNexOcc, occThrSho.u);
  connect(t6.outPort, morWarUp.inPort[1]);
  connect(t5.outPort, morWarUp.inPort[2]);
  connect(unOccNigSetBac.outPort[2], t5.inPort);
  connect(cb.TRooMin, TRooMin.u);
  connect(TRooSetHea.y, TRooMinErrHea.u1);
  connect(TRooMin.y, TRooMinErrHea.u2);
  connect(unOccOff.outPort[2], t6.inPort);
  connect(morWarUp.outPort[1], t3.inPort);
  connect(cb.occupied, occupied.u);
  connect(occ.outPort[1], t4.inPort);
  connect(t4.outPort, unOccOff.inPort[3]);
  connect(occThrSho.y, and1.u1);
  connect(and1.y, t6.condition);
  connect(and1.y, t5.condition);
  connect(cb.TRooAve, TRooAve.u);
  connect(booleanExpression.y, and1.u2);
  connect(preCooSta.y, t9.condition);
  connect(t9.outPort, morPreCoo.inPort[1]);
  connect(unOccOff.outPort[3], t9.inPort);
  connect(cb, preCooSta.controlBus);
  connect(morPreCoo.outPort[1], t7.inPort);
  connect(t7.outPort, occ.inPort[2]);
  connect(t3.outPort, occ.inPort[1]);
  connect(occThrSho.y, not1.u);
  connect(not1.y, and2.u2);
  connect(and2.y, t4.condition);
  connect(occupied.y, not2.u);
  connect(not2.y, and2.u1);
  connect(cb.TRooSetHea, TRooSetHea.u);
  connect(t8.outPort, occ.inPort[3]);
  connect(unOccOff.outPort[4], t8.inPort);
  connect(occupied.y, t8.condition);
  connect(morPreCoo.y, sum.u[1]);
  connect(morWarUp.y, sum.u[2]);
  connect(occ.y, sum.u[3]);
  connect(unOccOff.y, sum.u[4]);
  connect(unOccNigSetBac.y, sum.u[5]);
  connect(sum.y, cb.controlMode);
end ModeSelector;

Buildings.Examples.VAVReheat.Controls.PreCoolingStarter Buildings.Examples.VAVReheat.Controls.PreCoolingStarter

Outputs true when precooling should start

Buildings.Examples.VAVReheat.Controls.PreCoolingStarter

Information

Extends from Modelica.Blocks.Interfaces.BooleanSignalSource (Base class for Boolean signal sources).

Parameters

TypeNameDefaultDescription
TemperatureTOutLim286.15Limit for activating precooling [K]
TemperatureTRooSetCooOcc Set point for room air temperature during cooling mode [K]

Connectors

TypeNameDescription
output BooleanOutputyConnector of Boolean output signal
ControlBuscontrolBus 

Modelica definition

block PreCoolingStarter "Outputs true when precooling should start"
  extends Modelica.Blocks.Interfaces.BooleanSignalSource;
  parameter Modelica.SIunits.Temperature TOutLim = 286.15 
    "Limit for activating precooling";
  parameter Modelica.SIunits.Temperature TRooSetCooOcc 
    "Set point for room air temperature during cooling mode";
  ControlBus controlBus;
  Modelica.Blocks.Logical.GreaterThreshold greater(threshold=TRooSetCooOcc);
  Modelica.Blocks.Logical.LessThreshold greater2(threshold=1800);
  Modelica.Blocks.Logical.LessThreshold greater1(threshold=TOutLim);
  Modelica.Blocks.MathBoolean.And and3(nu=3);
equation 
  connect(controlBus.dTNexOcc, greater2.u);
  connect(controlBus.TRooAve, greater.u);
  connect(controlBus.TOut, greater1.u);
  connect(and3.y, y);
  connect(greater.y, and3.u[1]);
  connect(greater1.y, and3.u[2]);
  connect(greater2.y, and3.u[3]);
end PreCoolingStarter;

Buildings.Examples.VAVReheat.Controls.RoomTemperatureSetpoint Buildings.Examples.VAVReheat.Controls.RoomTemperatureSetpoint

Set point scheduler for room temperature

Buildings.Examples.VAVReheat.Controls.RoomTemperatureSetpoint

Information

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Parameters

TypeNameDefaultDescription
TemperatureTHeaOn293.15Heating setpoint during on [K]
TemperatureTHeaOff285.15Heating setpoint during off [K]
TemperatureTCooOn297.15Cooling setpoint during on [K]
TemperatureTCooOff303.15Cooling setpoint during off [K]

Connectors

TypeNameDescription
ControlBuscontrolBus 

Modelica definition

block RoomTemperatureSetpoint 
  "Set point scheduler for room temperature"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  import Buildings.Examples.VAVReheat.Controls.OperationModes;
  parameter Modelica.SIunits.Temperature THeaOn=293.15 
    "Heating setpoint during on";
  parameter Modelica.SIunits.Temperature THeaOff=285.15 
    "Heating setpoint during off";
  parameter Modelica.SIunits.Temperature TCooOn=297.15 
    "Cooling setpoint during on";
  parameter Modelica.SIunits.Temperature TCooOff=303.15 
    "Cooling setpoint during off";
  ControlBus controlBus;
  Modelica.Blocks.Routing.IntegerPassThrough mode;
  Modelica.Blocks.Sources.RealExpression setPoiHea(y=if (mode.y ==
        OperationModes.occupied or mode.y == OperationModes.unoccupiedWarmUp
         or mode.y == OperationModes.safety) then THeaOn else THeaOff);
  Modelica.Blocks.Sources.RealExpression setPoiCoo(y=if (mode.y ==
        OperationModes.occupied or mode.y == OperationModes.unoccupiedPreCool
         or mode.y == OperationModes.safety) then TCooOn else TCooOff) 
    "Cooling setpoint";
  Modelica.Blocks.Continuous.FirstOrder firOrdHea(each T=10, each initType=
        Modelica.Blocks.Types.Init.SteadyState,
    y(unit="K", displayUnit="degC")) 
    "First order element, used since otherwise, Dymola 7.3 cannot reduce the index of the DAE";
  Modelica.Blocks.Continuous.FirstOrder firOrdCoo(each T=10, each initType=
        Modelica.Blocks.Types.Init.SteadyState,
    y(unit="K", displayUnit="degC")) 
    "First order element, used since otherwise, Dymola 7.3 cannot reduce the index of the DAE";
    
equation 
  connect(controlBus.controlMode,mode. u);
  connect(setPoiHea.y, firOrdHea.u);
  connect(firOrdHea.y, controlBus.TRooSetHea);
  connect(setPoiCoo.y, firOrdCoo.u);
  connect(firOrdCoo.y, controlBus.TRooSetCoo);
end RoomTemperatureSetpoint;

Buildings.Examples.VAVReheat.Controls.RoomVAV Buildings.Examples.VAVReheat.Controls.RoomVAV

Controller for room VAV box

Buildings.Examples.VAVReheat.Controls.RoomVAV

Information

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Connectors

TypeNameDescription
ControlBuscontrolBus 
input RealInputTRooMeasured room temperature [K]
output RealOutputyHeaSignal for heating coil valve
output RealOutputyDamSignal for VAV damper
input RealInputTSupMeasured supply air temperature after heating coil

Modelica definition

block RoomVAV "Controller for room VAV box"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  Buildings.Controls.Continuous.LimPID conHea(
    yMax=1,
    xi_start=0.1,
    initType=Modelica.Blocks.Types.InitPID.InitialState,
    Td=60,
    yMin=0,
    controllerType=Modelica.Blocks.Types.SimpleController.PI,
    k=0.1,
    Ti=120) "Controller for heating";
  Buildings.Controls.Continuous.LimPID conCoo(
    yMax=1,
    reverseAction=true,
    Td=60,
    controllerType=Modelica.Blocks.Types.SimpleController.PI,
    k=0.1,
    Ti=120) "Controller for cooling (acts on damper)";
  ControlBus controlBus;
  Modelica.Blocks.Interfaces.RealInput TRoo(final quantity="ThermodynamicTemperature",
                                          final unit = "K", displayUnit = "degC", min=0) 
    "Measured room temperature";
  Modelica.Blocks.Interfaces.RealOutput yHea "Signal for heating coil valve";
  Modelica.Blocks.Interfaces.RealOutput yDam "Signal for VAV damper";
  Modelica.Blocks.Interfaces.RealInput TSup(displayUnit="degC") 
    "Measured supply air temperature after heating coil";
  Buildings.Utilities.Math.SmoothMax smoothMax2(deltaX=0.1);
  Modelica.Blocks.Sources.Constant one(k=1);
  Modelica.Blocks.Math.Add3 yDamHea(k3=-1) 
    "Outputs (unlimited) damper signal for heating.";
  Modelica.Blocks.Math.Add add;
  Modelica.Blocks.Sources.Constant zero(k=0.1);
  Buildings.Utilities.Math.SmoothMin smoothMin(deltaX=0.1);
equation 
  connect(controlBus.TRooSetHea, conHea.u_s);
  connect(controlBus.TRooSetCoo, conCoo.u_s);
  connect(conHea.u_m, TRoo);
  connect(conCoo.u_m, TRoo);
  connect(TRoo, yDamHea.u3);
  connect(yDamHea.u2, TSup);
  connect(one.y, yDamHea.u1);
  connect(conCoo.y, add.u2);
  connect(yDamHea.y, smoothMax2.u2);
  connect(smoothMax2.y, add.u1);
  connect(zero.y, smoothMax2.u1);
  connect(smoothMin.u1, add.y);
  connect(one.y, smoothMin.u2);
  connect(conHea.y, yHea);
  connect(smoothMin.y, yDam);
end RoomVAV;

Buildings.Examples.VAVReheat.Controls.State Buildings.Examples.VAVReheat.Controls.State

Block that outputs the mode if the state is active, or zero otherwise

Buildings.Examples.VAVReheat.Controls.State

Information

Extends from Modelica.StateGraph.StepWithSignal (Ordinary step (= step that is not active when simulation starts). Connector 'active' is true when the step is active).

Parameters

TypeNameDefaultDescription
IntegernIn1Number of input connections
IntegernOut1Number of output connections
OperationModesmode Enter enumeration of mode

Connectors

TypeNameDescription
Step_ininPort[nIn]Vector of step input connectors
Step_outoutPort[nOut]Vector of step output connectors
output BooleanOutputactive 
output IntegerOutputyMode signal (=0 if not active)

Modelica definition

model State 
  "Block that outputs the mode if the state is active, or zero otherwise"
  extends Modelica.StateGraph.StepWithSignal;
 parameter OperationModes mode "Enter enumeration of mode";
  Modelica.Blocks.Interfaces.IntegerOutput y "Mode signal (=0 if not active)";
equation 
   y = if localActive then mode else 0;
end State;

Buildings.Examples.VAVReheat.Controls.UnoccupiedOn Buildings.Examples.VAVReheat.Controls.UnoccupiedOn

Controller for unoccupied on state

Buildings.Examples.VAVReheat.Controls.UnoccupiedOn

Information

Extends from Modelica.StateGraph.StepWithSignal (Ordinary step (= step that is not active when simulation starts). Connector 'active' is true when the step is active).

Parameters

TypeNameDefaultDescription
IntegernIn1Number of input connections
IntegernOut1Number of output connections

Connectors

TypeNameDescription
Step_ininPort[nIn]Vector of step input connectors
Step_outoutPort[nOut]Vector of step output connectors
output BooleanOutputactive 

Modelica definition

model UnoccupiedOn "Controller for unoccupied on state"
  extends Modelica.StateGraph.StepWithSignal;
end UnoccupiedOn;

Buildings.Examples.VAVReheat.Controls.DuctStaticPressureSetpoint Buildings.Examples.VAVReheat.Controls.DuctStaticPressureSetpoint

Computes the duct static pressure setpoint

Buildings.Examples.VAVReheat.Controls.DuctStaticPressureSetpoint

Information

Extends from Modelica.Blocks.Interfaces.MISO (Multiple Input Single Output continuous control block).

Parameters

TypeNameDefaultDescription
Integernin1Number of inputs
AbsolutePressurepMin100Minimum duct static pressure setpoint [Pa]
AbsolutePressurepMax410Maximum duct static pressure setpoint [Pa]
Realk0.1Gain of controller
TimeTi60Time constant of Integrator block [s]
TimeTd60Time constant of Derivative block [s]
SimpleControllercontrollerTypeModelica.Blocks.Types.Simple...Type of controller

Connectors

TypeNameDescription
input RealInputu[nin]Connector of Real input signals
output RealOutputyConnector of Real output signal
input RealInputTOutOutside air temperature

Modelica definition

model DuctStaticPressureSetpoint 
  "Computes the duct static pressure setpoint"
  extends Modelica.Blocks.Interfaces.MISO;
  parameter Modelica.SIunits.AbsolutePressure pMin(displayUnit="Pa") = 100 
    "Minimum duct static pressure setpoint";
  parameter Modelica.SIunits.AbsolutePressure pMax(displayUnit="Pa") = 410 
    "Maximum duct static pressure setpoint";
  parameter Real k=0.1 "Gain of controller";
  parameter Modelica.SIunits.Time Ti=60 "Time constant of Integrator block";
  parameter Modelica.SIunits.Time Td=60 "Time constant of Derivative block";
  parameter Modelica.Blocks.Types.SimpleController controllerType=Modelica.Blocks.Types.SimpleController.PID 
    "Type of controller";
                           Buildings.Controls.Continuous.LimPID limPID(
    controllerType=controllerType,
    k=k,
    Ti=Ti,
    Td=Td,
    initType=Modelica.Blocks.Types.InitPID.InitialState,
    reverseAction=true);
protected 
  Buildings.Utilities.Math.Max max(final nin=nin);
  Modelica.Blocks.Sources.Constant ySet(k=0.9) 
    "Setpoint for maximum damper position";
  Modelica.Blocks.Math.Add dp(final k2=-1) "Pressure difference";
  Modelica.Blocks.Sources.Constant pMaxSig(k=pMax);
  Modelica.Blocks.Sources.Constant pMinSig(k=pMin);
  Modelica.Blocks.Math.Add pSet "Pressure setpoint";
  Modelica.Blocks.Math.Product product;
public 
  Modelica.Blocks.Logical.Hysteresis hysteresis(uLow=283.15, uHigh=284.15) 
    "Hysteresis to put fan on minimum revolution";
  Modelica.Blocks.Interfaces.RealInput TOut "Outside air temperature";
protected 
  Modelica.Blocks.Sources.Constant zero(k=0) "Zero output signal";
public 
  Modelica.Blocks.Logical.Switch switch1;
equation 
  connect(max.u, u);
  connect(ySet.y, limPID.u_s);
  connect(max.y, limPID.u_m);
  connect(limPID.y, product.u1);
  connect(pMaxSig.y, dp.u1);
  connect(pMinSig.y, dp.u2);
  connect(dp.y, product.u2);
  connect(pMinSig.y, pSet.u2);
  connect(pSet.y, y);
  connect(hysteresis.u, TOut);
  connect(product.y, switch1.u1);
  connect(zero.y, switch1.u3);
  connect(switch1.y, pSet.u1);
  connect(hysteresis.y, switch1.u2);
end DuctStaticPressureSetpoint;

Buildings.Examples.VAVReheat.Controls.CoolingCoilTemperatureSetpoint Buildings.Examples.VAVReheat.Controls.CoolingCoilTemperatureSetpoint

Set point scheduler for cooling coil

Buildings.Examples.VAVReheat.Controls.CoolingCoilTemperatureSetpoint

Information

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Parameters

TypeNameDefaultDescription
TemperatureTCooOn273.15 + 12Cooling setpoint during on [K]
TemperatureTCooOff273.15 + 30Cooling setpoint during off [K]

Connectors

TypeNameDescription
input RealInputTSetHeaSet point for heating coil
ControlBuscontrolBus 
output RealOutputTSetTemperature set point

Modelica definition

block CoolingCoilTemperatureSetpoint 
  "Set point scheduler for cooling coil"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  import Buildings.Examples.VAVReheat.Controls.OperationModes;
  parameter Modelica.SIunits.Temperature TCooOn=273.15+12 
    "Cooling setpoint during on";
  parameter Modelica.SIunits.Temperature TCooOff=273.15+30 
    "Cooling setpoint during off";
  Modelica.Blocks.Sources.RealExpression TSupSetCoo(
   y=if (mode.y == OperationModes.occupied or mode.y == OperationModes.unoccupiedPreCool or mode.y == OperationModes.safety) then 
          TCooOn else TCooOff) "Supply air temperature setpoint for cooling";
  Modelica.Blocks.Interfaces.RealInput TSetHea "Set point for heating coil";
  Modelica.Blocks.Math.Add add;
  Modelica.Blocks.Sources.Constant dTMin(k=1) 
    "Minimum offset for cooling coil setpoint";
  Modelica.Blocks.Math.Max max1;
  ControlBus controlBus;
  Modelica.Blocks.Routing.IntegerPassThrough mode;
  Modelica.Blocks.Interfaces.RealOutput TSet "Temperature set point";
equation 
  connect(dTMin.y, add.u1);
  connect(add.y, max1.u1);
  connect(TSupSetCoo.y, max1.u2);
  connect(controlBus.controlMode, mode.u);
  connect(max1.y, TSet);
  connect(TSetHea, add.u2);
end CoolingCoilTemperatureSetpoint;

Buildings.Examples.VAVReheat.Controls.MixedAirTemperatureSetpoint Buildings.Examples.VAVReheat.Controls.MixedAirTemperatureSetpoint

Mixed air temperature setpoint for economizer

Buildings.Examples.VAVReheat.Controls.MixedAirTemperatureSetpoint

Information

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Connectors

TypeNameDescription
input RealInputTSupHeaSetSupply temperature setpoint for heating
input RealInputTSupCooSetSupply temperature setpoint for cooling
ControlBuscontrolBus 
output RealOutputTSetMixed air temperature setpoint

Modelica definition

model MixedAirTemperatureSetpoint 
  "Mixed air temperature setpoint for economizer"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  Modelica.Blocks.Routing.Extractor TSetMix(nin=6) 
    "Mixed air setpoint temperature extractor";
  Modelica.Blocks.Sources.Constant off(k=273.15 + 13) 
    "Setpoint temperature to close damper";
  Buildings.Utilities.Math.Average ave(nin=2);
  Modelica.Blocks.Interfaces.RealInput TSupHeaSet 
    "Supply temperature setpoint for heating";
  Modelica.Blocks.Interfaces.RealInput TSupCooSet 
    "Supply temperature setpoint for cooling";
  Modelica.Blocks.Sources.Constant TPreCoo(k=273.15 + 13) 
    "Setpoint during pre-cooling";
  ControlBus controlBus;
  Modelica.Blocks.Interfaces.RealOutput TSet "Mixed air temperature setpoint";
  Modelica.Blocks.Routing.Multiplex2 multiplex2_1;
equation 
  connect(TSetMix.u[1], ave.y);
  connect(ave.y, TSetMix.u[1]);
  connect(off.y, TSetMix.u[2]);
  connect(off.y, TSetMix.u[3]);
  connect(off.y, TSetMix.u[4]);
  connect(TPreCoo.y, TSetMix.u[5]);
  connect(off.y, TSetMix.u[6]);
  connect(controlBus.controlMode, TSetMix.index);
  connect(TSetMix.y, TSet);
  connect(multiplex2_1.y, ave.u);
  connect(TSupCooSet, multiplex2_1.u2[1]);
  connect(TSupHeaSet, multiplex2_1.u1[1]);
end MixedAirTemperatureSetpoint;

Buildings.Examples.VAVReheat.Controls.EconomizerTemperatureControl Buildings.Examples.VAVReheat.Controls.EconomizerTemperatureControl

Controller for economizer mixed air temperature

Buildings.Examples.VAVReheat.Controls.EconomizerTemperatureControl

Information

Extends from Modelica.Blocks.Interfaces.BlockIcon (Basic graphical layout of input/output block).

Parameters

TypeNameDefaultDescription
Realk1Gain of controller
TimeTi Time constant of Integrator block [s]

Connectors

TypeNameDescription
output RealOutputyOAControl signal for outside air damper
input RealInputTRetReturn air temperature
input RealInputTOutOutside air temperature
input RealInputTMixMixed air temperature
input RealInputTMixSetSetpoint for mixed air temperature

Modelica definition

block EconomizerTemperatureControl 
  "Controller for economizer mixed air temperature"
  extends Modelica.Blocks.Interfaces.BlockIcon;
  import Buildings.Examples.VAVReheat.Controls.OperationModes;
  Buildings.Controls.Continuous.LimPID con(
    k=k,
    Ti=Ti,
    yMax=0.995,
    yMin=0.005,
    Td=60,
    controllerType=Modelica.Blocks.Types.SimpleController.PI) 
    "Controller for mixed air temperature";
  parameter Real k=1 "Gain of controller";
  parameter Modelica.SIunits.Time Ti "Time constant of Integrator block";
  Modelica.Blocks.Logical.Greater signGain "Sign of control gain";
  Modelica.Blocks.Logical.Switch swi1;
  Modelica.Blocks.Logical.Switch swi2;
  Modelica.Blocks.Interfaces.RealOutput yOA 
    "Control signal for outside air damper";
  Modelica.Blocks.Interfaces.RealInput TRet "Return air temperature";
  Modelica.Blocks.Interfaces.RealInput TOut "Outside air temperature";
  Modelica.Blocks.Interfaces.RealInput TMix "Mixed air temperature";
  Modelica.Blocks.Interfaces.RealInput TMixSet 
    "Setpoint for mixed air temperature";
equation 
  connect(signGain.y, swi1.u2);
  connect(swi1.y, con.u_s);
  connect(swi2.y, con.u_m);
  connect(signGain.y, swi2.u2);
  connect(con.y, yOA);
  connect(signGain.u1, TRet);
  connect(signGain.u2, TOut);
  connect(swi1.u1, TMix);
  connect(swi2.u3, TMix);
  connect(swi1.u3, TMixSet);
  connect(swi2.u1, TMixSet);
end EconomizerTemperatureControl;

Automatically generated Wed May 15 12:04:26 2013.