partial block PartialController "Interface class for AHU controller" parameter Buildings.Templates.AirHandlersFans.Types.Controller typ "Type of controller"; parameter Integer nZon "Number of served zones"; outer parameter Buildings.Templates.Data.AllSystems datAll "Top-level (whole building) system parameters"; parameter Buildings.Templates.Components.Types.Fan typFanSup "Type of supply fan"; parameter Buildings.Templates.Components.Types.Fan typFanRel "Type of relief fan"; parameter Buildings.Templates.Components.Types.Fan typFanRet "Type of return fan"; parameter Integer nFanSup "Number of supply fans"; parameter Integer nFanRel "Number of relief fans"; parameter Integer nFanRet "Number of return fans"; replaceable parameter Buildings.Templates.AirHandlersFans.Components.Data.PartialController dat( final typ=typ, final typFanSup=typFanSup, final typFanRel=typFanRel, final typFanRet=typFanRet) "Design and operating parameters"; Buildings.Templates.AirHandlersFans.Interfaces.Bus bus "AHU control bus"; Buildings.Templates.ZoneEquipment.Interfaces.Bus busTer[nZon] "Terminal unit control bus"; end PartialController;

partial block PartialControllerVAVMultizone "Interface class for multiple-zone VAV controller" extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialController ( redeclare Buildings.Templates.AirHandlersFans.Components.Data.VAVMultiZoneController dat( typSecOut=secOutRel.typSecOut, buiPreCon=buiPreCon, stdVen=stdVen)); outer replaceable Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialOutdoorReliefReturnSection secOutRel "Outdoor/relief/return air section"; outer replaceable Buildings.Templates.Components.Coils.None coiCoo "Cooling coil"; outer replaceable Buildings.Templates.Components.Coils.None coiHeaPre "Heating coil (preheat position)"; outer replaceable Buildings.Templates.Components.Coils.None coiHeaReh "Heating coil (reheat position)"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer typCtlEco= Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer.FixedDryBulb "Economizer control type"; parameter Buildings.Templates.AirHandlersFans.Types.ControlFanReturn typCtlFanRet= Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured "Return fan control type"; parameter Boolean use_TMix=true "Set to true if mixed air temperature measurement is enabled"; parameter Boolean have_frePro=true "Set to true to include freeze protection"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.FreezeStat typFreSta= Buildings.Controls.OBC.ASHRAE.G36.Types.FreezeStat.No_freeze_stat "Option for low limit (freeze) protection"; final parameter Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection typSecOut= secOutRel.typSecOut "Type of outdoor air section"; final parameter Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl buiPreCon=if secOutRel.typSecRel == Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReliefDamper then Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReliefDamper elseif secOutRel.typSecRel == Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReliefFan then Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReliefFan elseif secOutRel.typSecRel == Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReturnFan then (if typCtlFanRet == Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured then Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReturnFanMeasuredAir elseif typCtlFanRet == Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.BuildingPressure then Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReturnFanDp else Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReliefDamper) else Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReliefDamper "Type of building pressure control system"; final parameter Buildings.Controls.OBC.ASHRAE.G36.Types.EnergyStandard stdEne= datAll.stdEne "Energy standard"; final parameter Buildings.Controls.OBC.ASHRAE.G36.Types.VentilationStandard stdVen= datAll.stdVen "Ventilation standard"; parameter Boolean have_CO2Sen=false "Set to true if there are zones with CO2 sensor"; initial equation if typ==Buildings.Templates.AirHandlersFans.Types.Controller.G36VAVMultiZone then // We check the fallback "else" clause. if buiPreCon == Buildings.Controls.OBC.ASHRAE.G36.Types.PressureControl.ReliefDamper then assert(secOutRel.typSecRel==Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.ReliefDamper, "In "+ getInstanceName() + ": "+ "The system configuration is incompatible with available options for building pressure control."); end if; end if; end PartialControllerVAVMultizone;

partial model PartialHeatRecovery "Interface class for heat recovery" replaceable package MediumAir=Buildings.Media.Air constrainedby Modelica.Media.Interfaces.PartialMedium "Air medium"; parameter Buildings.Templates.AirHandlersFans.Types.HeatRecovery typ "Equipment type"; parameter Boolean allowFlowReversal = true "= false to simplify equations, assuming, but not enforcing, no flow reversal"; Buildings.Templates.AirHandlersFans.Interfaces.Bus bus if typ <> Buildings.Templates.AirHandlersFans.Types.HeatRecovery.None "Control bus"; Modelica.Fluid.Interfaces.FluidPort_a port_aOut( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.HeatRecovery.None "Outdoor air inlet"; Modelica.Fluid.Interfaces.FluidPort_b port_bOut( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.HeatRecovery.None "Outdoor air outlet"; Modelica.Fluid.Interfaces.FluidPort_a port_aRel( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.HeatRecovery.None "Relief/exhaust air inlet"; Modelica.Fluid.Interfaces.FluidPort_b port_bRel( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.HeatRecovery.None "Relief/exhaust air outlet"; end PartialHeatRecovery;

partial model PartialOutdoorReliefReturnSection "Interface class for outdoor/relief/return air section" replaceable package MediumAir=Buildings.Media.Air constrainedby Modelica.Media.Interfaces.PartialMedium "Air medium"; parameter Buildings.Templates.AirHandlersFans.Types.OutdoorReliefReturnSection typ "Outdoor/relief/return air section type"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection typSecOut "Outdoor air section type"; parameter Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection typSecRel "Relief/return air section type"; parameter Buildings.Templates.Components.Types.Damper typDamOut "Outdoor air damper type"; parameter Buildings.Templates.Components.Types.Damper typDamOutMin "Minimum outdoor air damper type"; parameter Buildings.Templates.Components.Types.Damper typDamRel "Relief damper type"; parameter Buildings.Templates.Components.Types.Damper typDamRet "Return damper type"; parameter Buildings.Templates.Components.Types.Fan typFanRel "Relief fan type"; parameter Buildings.Templates.Components.Types.Fan typFanRet "Return fan type"; parameter Integer nFanRet( start=if typFanRet==Buildings.Templates.Components.Types.Fan.None then 0 else 1) "Number of return fans"; parameter Integer nFanRel( start=if typFanRel==Buildings.Templates.Components.Types.Fan.None then 0 else 1) "Number of relief fans"; parameter Boolean have_eco "Set to true in case of economizer function"; parameter Boolean have_recHea = false "Set to true in case of heat recovery"; parameter Buildings.Templates.AirHandlersFans.Types.ControlFanReturn typCtlFanRet= Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.AirflowMeasured "Return fan control type"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer typCtlEco= Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer.FixedDryBulb "Economizer control type"; parameter Buildings.Templates.AirHandlersFans.Components.Data.OutdoorReliefReturnSection dat( final typDamOut=typDamOut, final typDamOutMin=typDamOutMin, final typDamRet=typDamRet, final typDamRel=typDamRel, final typFanRel=typFanRel, final typFanRet=typFanRet) "Design and operating parameters"; final parameter Modelica.Units.SI.MassFlowRate mAirSup_flow_nominal= dat.damOut.m_flow_nominal "Supply air mass flow rate"; final parameter Modelica.Units.SI.MassFlowRate mAirRet_flow_nominal= dat.damRet.m_flow_nominal "Return air mass flow rate"; final parameter Modelica.Units.SI.MassFlowRate mOutMin_flow_nominal= dat.mOutMin_flow_nominal "Minimum outdoor air mass flow rate at design conditions"; final parameter Modelica.Units.SI.PressureDifference dpDamOut_nominal= dat.damOut.dp_nominal "Outdoor air damper pressure drop"; final parameter Modelica.Units.SI.PressureDifference dpDamOutMin_nominal= dat.damOutMin.dp_nominal "Minimum outdoor air damper pressure drop"; final parameter Modelica.Units.SI.PressureDifference dpDamRel_nominal= dat.damRel.dp_nominal "Relief air damper pressure drop"; final parameter Modelica.Units.SI.PressureDifference dpDamRet_nominal= dat.damRet.dp_nominal "Return air damper pressure drop"; parameter Modelica.Fluid.Types.Dynamics energyDynamics= Modelica.Fluid.Types.Dynamics.DynamicFreeInitial "Type of energy balance: dynamic (3 initialization options) or steady state"; parameter Boolean allowFlowReversal = true "= false to simplify equations, assuming, but not enforcing, no flow reversal"; Modelica.Fluid.Interfaces.FluidPort_b port_Rel( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.OutdoorReliefReturnSection.MixedAirNoRelief "Relief (exhaust) air"; Modelica.Fluid.Interfaces.FluidPort_a port_Out( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Outdoor air intake"; Modelica.Fluid.Interfaces.FluidPort_b port_Sup( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Supply air"; Modelica.Fluid.Interfaces.FluidPort_a port_Ret( redeclare final package Medium =MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Return air"; Modelica.Fluid.Interfaces.FluidPort_b port_bPre( redeclare final package Medium = MediumAir) "Optional fluid connector for differential pressure sensor"; Buildings.Templates.AirHandlersFans.Interfaces.Bus bus "Control bus"; end PartialOutdoorReliefReturnSection;

partial model PartialOutdoorSection "Interface class for outdoor air section" replaceable package MediumAir=Buildings.Media.Air constrainedby Modelica.Media.Interfaces.PartialMedium "Air medium"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection typ "Outdoor air section type"; final parameter Buildings.Templates.Components.Types.Damper typDamOut= if typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.SingleDamper or typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersAirflow or typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersPressure then Buildings.Templates.Components.Types.Damper.Modulating else Buildings.Templates.Components.Types.Damper.None "Outdoor air damper type"; final parameter Buildings.Templates.Components.Types.Damper typDamOutMin= if typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.SingleDamper then Buildings.Templates.Components.Types.Damper.None elseif typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersAirflow then Buildings.Templates.Components.Types.Damper.Modulating elseif typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersPressure then Buildings.Templates.Components.Types.Damper.TwoPosition else Buildings.Templates.Components.Types.Damper.None "Minimum outdoor air damper type"; parameter Boolean have_recHea "Set to true in case of heat recovery"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer typCtlEco "Economizer control type"; parameter Buildings.Templates.AirHandlersFans.Components.Data.OutdoorReliefReturnSection dat "Design and operating parameters"; final parameter Modelica.Units.SI.MassFlowRate m_flow_nominal= dat.damOut.m_flow_nominal "Air mass flow rate"; final parameter Modelica.Units.SI.MassFlowRate mOutMin_flow_nominal= dat.mOutMin_flow_nominal "Minimum outdoor air mass flow rate"; parameter Modelica.Fluid.Types.Dynamics energyDynamics= Modelica.Fluid.Types.Dynamics.DynamicFreeInitial "Type of energy balance: dynamic (3 initialization options) or steady state"; parameter Boolean allowFlowReversal = true "= false to simplify equations, assuming, but not enforcing, no flow reversal"; Modelica.Fluid.Interfaces.FluidPort_a port_a( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Fluid connector a (positive design flow direction is from port_a to port_b)"; Modelica.Fluid.Interfaces.FluidPort_b port_b( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Fluid connector b (positive design flow direction is from port_a to port_b)"; Modelica.Fluid.Interfaces.FluidPort_a port_aHeaRec( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if have_recHea "Optional fluid connector for heat recovery"; Modelica.Fluid.Interfaces.FluidPort_b port_bHeaRec( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if have_recHea "Optional fluid connector for heat recovery"; Buildings.Templates.AirHandlersFans.Interfaces.Bus bus "Control bus"; end PartialOutdoorSection;

partial model PartialOutdoorSectionDedicatedDampers "Base class for modeling separate dampers for ventilation and economizer" extends Buildings.Templates.AirHandlersFans.Components.Interfaces.PartialOutdoorSection; Buildings.Templates.Components.Actuators.Damper damOut( redeclare final package Medium = MediumAir, final typ=typDamOut, use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState, final allowFlowReversal=allowFlowReversal, final dat=dat.damOut) "Economizer outdoor air damper"; Buildings.Templates.Components.Actuators.Damper damOutMin( redeclare final package Medium = MediumAir, final typ=typDamOutMin, use_inputFilter=energyDynamics<>Modelica.Fluid.Types.Dynamics.SteadyState, final allowFlowReversal=allowFlowReversal, final dat=dat.damOutMin) "Minimum outdoor air damper"; Buildings.Templates.Components.Sensors.Temperature TOut( redeclare final package Medium = MediumAir, final allowFlowReversal=allowFlowReversal, final have_sen=true, final m_flow_nominal=mOutMin_flow_nominal) "Outdoor air temperature sensor"; Buildings.Templates.Components.Sensors.VolumeFlowRate VOutMin_flow( redeclare final package Medium = MediumAir, final allowFlowReversal=allowFlowReversal, final have_sen=typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersAirflow, final m_flow_nominal=mOutMin_flow_nominal, final typ=Buildings.Templates.Components.Types.SensorVolumeFlowRate.AFMS) "Minimum outdoor air volume flow rate sensor"; Buildings.Templates.Components.Sensors.SpecificEnthalpy hAirOut( redeclare final package Medium = MediumAir, final allowFlowReversal=allowFlowReversal, final have_sen= typCtlEco==Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer.FixedEnthalpyWithFixedDryBulb or typCtlEco==Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer.DifferentialEnthalpyWithFixedDryBulb, final m_flow_nominal=mOutMin_flow_nominal) "Outdoor air enthalpy sensor"; Buildings.Templates.Components.Sensors.DifferentialPressure dpAirOutMin( redeclare final package Medium = MediumAir, final have_sen=typ==Buildings.Controls.OBC.ASHRAE.G36.Types.OutdoorAirSection.DedicatedDampersPressure) "Minimum outdoor air damper differential pressure sensor"; Buildings.Fluid.FixedResistances.Junction junInl( redeclare final package Medium = MediumAir, final m_flow_nominal=m_flow_nominal*{1,-1,-1}, dp_nominal=fill(0,3), final energyDynamics=energyDynamics) "Inlet fluid junction"; Fluid.FixedResistances.Junction junOut( redeclare final package Medium = MediumAir, final m_flow_nominal=m_flow_nominal*{1,-1,1}, dp_nominal=fill(0, 3), final energyDynamics=energyDynamics) "Outlet fluid junction"; equation /* Control point connection - start */ connect(damOut.bus, bus.damOut); connect(damOutMin.bus, bus.damOutMin); connect(TOut.y, bus.TOut); connect(hAirOut.y, bus.hAirOut); connect(VOutMin_flow.y, bus.VOutMin_flow); connect(dpAirOutMin.y, bus.dpAirOutMin); /* Control point connection - end */ connect(TOut.port_b, VOutMin_flow.port_a); connect(damOutMin.port_b, hAirOut.port_a); connect(hAirOut.port_b, TOut.port_a); connect(damOutMin.port_a, dpAirOutMin.port_a); connect(dpAirOutMin.port_b, damOutMin.port_b); connect(damOut.port_a, junInl.port_2); connect(port_a, junInl.port_1); connect(junInl.port_3, damOutMin.port_a); connect(port_b, junOut.port_2); connect(damOut.port_b, junOut.port_1); connect(VOutMin_flow.port_b, junOut.port_3); end PartialOutdoorSectionDedicatedDampers;

partial model PartialReliefReturnSection "Interface class for relief/return air section" replaceable package MediumAir=Buildings.Media.Air constrainedby Modelica.Media.Interfaces.PartialMedium "Air medium"; parameter Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection typ "Relief/return air section type"; parameter Buildings.Templates.Components.Types.Damper typDamRel "Relief damper type"; parameter Buildings.Templates.Components.Types.Fan typFanRel "Relief fan type"; parameter Buildings.Templates.Components.Types.Fan typFanRet "Return fan type"; parameter Integer nFanRet( start=if typFanRet==Buildings.Templates.Components.Types.Fan.None then 0 else 1) "Number of return fans"; parameter Integer nFanRel( start=if typFanRel==Buildings.Templates.Components.Types.Fan.None then 0 else 1) "Number of relief fans"; parameter Boolean have_recHea "Set to true in case of heat recovery"; parameter Buildings.Templates.AirHandlersFans.Types.ControlFanReturn typCtlFanRet "Return fan control type"; parameter Buildings.Controls.OBC.ASHRAE.G36.Types.ControlEconomizer typCtlEco "Economizer control type"; parameter Buildings.Templates.AirHandlersFans.Components.Data.OutdoorReliefReturnSection dat "Design and operating parameters"; final parameter Modelica.Units.SI.MassFlowRate m_flow_nominal= if typFanRet <> Buildings.Templates.Components.Types.Fan.None then dat.fanRet.m_flow_nominal elseif typFanRel <> Buildings.Templates.Components.Types.Fan.None then dat.fanRel.m_flow_nominal elseif typDamRel <> Buildings.Templates.Components.Types.Damper.None then dat.damRel.m_flow_nominal else dat.damRet.m_flow_nominal "Air mass flow rate"; final parameter Modelica.Units.SI.PressureDifference dpFan_nominal= if typFanRel <> Buildings.Templates.Components.Types.Fan.None then dat.fanRel.dp_nominal elseif typFanRet <> Buildings.Templates.Components.Types.Fan.None then dat.fanRet.dp_nominal else 0 "Relief/return fan total pressure rise"; parameter Modelica.Fluid.Types.Dynamics energyDynamics= Modelica.Fluid.Types.Dynamics.DynamicFreeInitial "Type of energy balance: dynamic (3 initialization options) or steady state"; parameter Boolean allowFlowReversal = true "= false to simplify equations, assuming, but not enforcing, no flow reversal"; Modelica.Fluid.Interfaces.FluidPort_a port_a( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) "Fluid connector a (positive design flow direction is from port_a to port_b)"; Modelica.Fluid.Interfaces.FluidPort_b port_b( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.NoRelief "Fluid connector b (positive design flow direction is from port_a to port_b)"; Modelica.Fluid.Interfaces.FluidPort_a port_aHeaRec( redeclare final package Medium = MediumAir, m_flow(min=if allowFlowReversal then -Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if have_recHea "Optional fluid connector for heat recovery"; Modelica.Fluid.Interfaces.FluidPort_b port_bHeaRec( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if have_recHea "Optional fluid connector for heat recovery"; Modelica.Fluid.Interfaces.FluidPort_b port_bRet( redeclare final package Medium = MediumAir, m_flow(max=if allowFlowReversal then +Modelica.Constants.inf else 0), h_outflow(start=MediumAir.h_default, nominal=MediumAir.h_default)) if typ <> Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection.NoReturn "Optional fluid connector for return branch"; Modelica.Fluid.Interfaces.FluidPort_b port_bPre( redeclare final package Medium = MediumAir) "Fluid connector for differential pressure sensor"; Buildings.Templates.AirHandlersFans.Interfaces.Bus bus "Control bus"; Buildings.Fluid.FixedResistances.Junction splEco( redeclare final package Medium = MediumAir, final m_flow_nominal={1,-1,-1}*m_flow_nominal, final dp_nominal=fill(0, 3), final energyDynamics=energyDynamics, final portFlowDirection_1=if allowFlowReversal then Modelica.Fluid.Types.PortFlowDirection.Bidirectional else Modelica.Fluid.Types.PortFlowDirection.Entering, final portFlowDirection_2=if allowFlowReversal then Modelica.Fluid.Types.PortFlowDirection.Bidirectional else Modelica.Fluid.Types.PortFlowDirection.Leaving, final portFlowDirection_3=if allowFlowReversal then Modelica.Fluid.Types.PortFlowDirection.Bidirectional else Modelica.Fluid.Types.PortFlowDirection.Leaving) "Splitter with air economizer"; Buildings.Templates.Components.Sensors.DifferentialPressure pAirRet_rel( redeclare final package Medium = MediumAir, final have_sen=typFanRet<>Buildings.Templates.Components.Types.Fan.None and typCtlFanRet==Buildings.Templates.AirHandlersFans.Types.ControlFanReturn.BuildingPressure) "Return fan discharge static pressure sensor"; equation /* Control point connection - start */ connect(pAirRet_rel.y, bus.pAirRet_rel); /* Control point connection - end */ connect(splEco.port_3, port_bRet); connect(pAirRet_rel.port_a, splEco.port_1); connect(pAirRet_rel.port_b, port_bPre); end PartialReliefReturnSection;