block CoolingCoilTemperatureSetpoint "Set point scheduler for cooling coil" extends Modelica.Blocks.Icons.Block; import Buildings.Examples.VAVReheat.Controls.OperationModes; parameter Modelica.SIunits.Temperature TOn "Setpoint during on"; parameter Modelica.SIunits.Temperature TOff "Setpoint during off"; Modelica.Blocks.Sources.RealExpression TSetPoi( y=if (mode.y == Integer(OperationModes.occupied) or mode.y == Integer(OperationModes.unoccupiedPreCool) or mode.y == Integer(OperationModes.safety)) then TOn else TOff) "Air temperature setpoint"; VAVReheat.Controls.ControlBus controlBus; Modelica.Blocks.Routing.IntegerPassThrough mode; Modelica.Blocks.Interfaces.RealOutput TSet "Temperature set point"; equation connect(controlBus.controlMode, mode.u); connect(TSetPoi.y, TSet); end CoolingCoilTemperatureSetpoint;

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, Ti=10) "Controller"; Modelica.Blocks.Math.Gain gaiMea(k=1/xSet_nominal) "Gain to normalize measurement signal"; parameter Real xSet_nominal "Nominal setpoint (used for normalization)"; VAVReheat.Controls.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"; Modelica.Blocks.Continuous.FirstOrder firstOrder( initType=Modelica.Blocks.Types.Init.InitialState, y_start=r_N_min, T=60); 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, firstOrder.u); connect(y, extractor.y); end FanVFD;

block HeatingCoilTemperatureSetpoint "Set point scheduler for heating coil" import Buildings.Examples.VAVReheat.Controls.OperationModes; extends CoolingCoilTemperatureSetpoint(TSetPoi( y=if (mode.y == Integer(OperationModes.unoccupiedOff)) then TOff else TOn)); end HeatingCoilTemperatureSetpoint;

model PreHeatCoil "Controller for preheat coil" extends Modelica.Blocks.Icons.Block; Buildings.Controls.Continuous.LimPID preHeaCoiCon( yMax=1, yMin=0, Td=60, initType=Modelica.Blocks.Types.InitPID.InitialState, Ti=120, strict=true, controllerType=Modelica.Blocks.Types.SimpleController.PI, k=0.1) "Controller for pre-heating coil"; Modelica.Blocks.Sources.Constant zero(k=0) "Zero output signal"; Modelica.Blocks.Logical.Switch swiPumPreCoi "Switch for preheat coil pump"; Modelica.Blocks.Logical.OnOffController preHeaOn(bandwidth=1) "Switch to enable preheat coil"; Modelica.Blocks.Sources.Constant TPreHeaOn(k=273.15 + 10) "Temperature when preheat coil is switched on."; Modelica.Blocks.Sources.Constant one(k=1) "Outputs 1"; Modelica.Blocks.Interfaces.RealInput TAirSup(unit="K") "Supply air temperature after the coil"; Modelica.Blocks.Interfaces.RealInput TSupSetHea(unit="K") "Heating set point temperature for supply air"; Modelica.Blocks.Interfaces.RealOutput yVal(unit="1") "Control signal for valve"; Modelica.Blocks.Interfaces.RealInput TMix(unit="K") "Mixed air temperature upstream of coil"; Modelica.Blocks.Interfaces.RealOutput yPum(unit="1") "Control signal for pump"; Modelica.Blocks.Logical.Switch swiValOp "Switch to close valve if pump is not running"; Modelica.StateGraph.InitialStep pumOff "Pump is off"; Modelica.StateGraph.TransitionWithSignal toOn "Switch pump on"; inner Modelica.StateGraph.StateGraphRoot stateGraphRoot; Modelica.StateGraph.StepWithSignal pumOn "Pump on"; Modelica.StateGraph.TransitionWithSignal toOff(enableTimer=true, waitTime=30* 60) "Switch pump off"; Modelica.Blocks.Logical.Not not1; equation connect(preHeaOn.reference,TPreHeaOn. y); connect(zero.y, swiPumPreCoi.u3); connect(one.y, swiPumPreCoi.u1); connect(TAirSup, preHeaCoiCon.u_m); connect(TSupSetHea, preHeaCoiCon.u_s); connect(TMix, preHeaOn.u); connect(yPum, swiPumPreCoi.y); connect(zero.y, swiValOp.u3); connect(swiValOp.y, yVal); connect(pumOff.outPort[1], toOn.inPort); connect(toOn.condition, preHeaOn.y); connect(pumOn.inPort[1], toOn.outPort); connect(toOff.inPort, pumOn.outPort[1]); connect(preHeaOn.y, not1.u); connect(not1.y, toOff.condition); connect(toOff.outPort, pumOff.inPort[1]); connect(pumOn.active, swiPumPreCoi.u2); connect(pumOn.active, swiValOp.u2); connect(preHeaCoiCon.y, swiValOp.u1); end PreHeatCoil;

block RoomMixingBox "Controller for room mixing box" extends Modelica.Blocks.Icons.Block; parameter Modelica.SIunits.MassFlowRate m_flow_min "Minimum mass flow rate"; 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)"; Modelica.Blocks.Interfaces.RealInput TRoo(final quantity="ThermodynamicTemperature", final unit = "K", displayUnit = "degC", min=0) "Measured room temperature"; Modelica.Blocks.Interfaces.RealOutput yHot "Signal for hot air damper"; Modelica.Blocks.Interfaces.RealOutput yCol "Signal for cold deck air damper"; Modelica.Blocks.Interfaces.RealInput mAir_flow "Measured air mass flow rate into the room"; Buildings.Controls.Continuous.LimPID conFloRat( yMax=1, xi_start=0.1, Td=60, yMin=0, controllerType=Modelica.Blocks.Types.SimpleController.PI, k=0.1, Ti=120) "Controller for mass flow rate"; Modelica.Blocks.Sources.Constant mAirSet(k=m_flow_min) "Set point for minimum air flow rate"; Buildings.Utilities.Math.SmoothMax smoothMaxHea(deltaX=0.01) "Adds control signal for minimum flow rate of zone"; Modelica.Blocks.Interfaces.RealInput TRooSetHea(unit="K") "Room temperature setpoint for heating"; Modelica.Blocks.Interfaces.RealInput TRooSetCoo(unit="K") "Room temperature setpoint for cooling"; Modelica.Blocks.Sources.RealExpression gaiCoo(y= Buildings.Utilities.Math.Functions.smoothLimit( (TRoo - TRooSetHea)/(TRooSetCoo - TRooSetHea), 0, 1, 0.01)) "Gain for adding minimum flow rate to cooling signal"; Modelica.Blocks.Sources.RealExpression gaiHea(y=1 - gaiCoo.y) "Gain for adding minimum flow rate to cooling signal"; Modelica.Blocks.Math.Product product; Modelica.Blocks.Math.Product product1; Buildings.Utilities.Math.SmoothMax smoothMaxCoo(deltaX=0.01) "Adds control signal for minimum flow rate of zone"; equation connect(mAir_flow, conFloRat.u_m); connect(conHea.y, smoothMaxHea.u1); connect(conHea.u_s, TRooSetHea); connect(conCoo.u_s, TRooSetCoo); connect(TRoo, conCoo.u_m); connect(TRoo, conHea.u_m); connect(conFloRat.y, product.u1); connect(product.y, smoothMaxHea.u2); connect(product.u2, gaiHea.y); connect(gaiCoo.y, product1.u1); connect(conFloRat.y, product1.u2); connect(smoothMaxHea.y, yHot); connect(product1.y, smoothMaxCoo.u1); connect(conCoo.y, smoothMaxCoo.u2); connect(smoothMaxCoo.y, yCol); connect(mAirSet.y, conFloRat.u_s); end RoomMixingBox;