Buildings.Applications.DataCenters.ChillerCooled.Examples

Collection of models that illustrate model use and test models

Information

This package contains examples for the use of models that can be found in Buildings.Applications.DataCenters.ChillerCooled.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
IntegratedPrimaryLoadSideEconomizer	Example that demonstrates a chiller plant with integrated primary load side economizer
IntegratedPrimarySecondaryEconomizer	Example that demonstrates a chiller plant with integrated primary-secondary side economizer
NonIntegratedPrimarySecondaryEconomizer	Example that demonstrates a chiller plant with non-integrated primary-secondary side economizer
BaseClasses	Base classes for examples

Buildings.Applications.DataCenters.ChillerCooled.Examples.IntegratedPrimaryLoadSideEconomizer

Example that demonstrates a chiller plant with integrated primary load side economizer

Buildings.Applications.DataCenters.ChillerCooled.Examples.IntegratedPrimaryLoadSideEconomizer

Information

System Configuration

This example demonstrates the implementation of a chiller plant with water-side economizer (WSE) to cool a data center. The system is a primary-only chiller plant with two chillers and an integrated WSE located on the load side. The system schematics is as shown below.

Control Logic

This section describes the detailed control logic used in this chilled water plant system.

Cooling Mode Control

The chilled water system with integrated waterside economizer can run in three modes: free cooling (FC) mode, partially mechanical cooling (PMC) mode and fully mechanical cooling (FMC) mode. The detailed control logics about how to switch among these three cooling modes are described in Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingMode. Details on how the valves are operated under different cooling modes are presented in Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimaryLoadSide.

Chiller Staging Control

The staging sequence of multiple chillers are descibed as below:

The chillers are all off when cooling mode is FC.
One chiller is commanded on when cooling mode is not FC.
Two chillers are commanded on when cooling mode is not FC and the cooling load served by the chillers is larger than a critical value.

The detailed implementation is shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.ChillerStage.

Pump Staging Control

For constant speed pumps, the number of running pumps equals to the number of running chillers.

For variable speed pumps, the number of running pumps is controlled by the speed signal and the mass flow rate. Details are shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.VariableSpeedPumpStage. The speed is controlled by maintaining a fixed differential pressure between the outlet and inlet on the waterside of the Computer Room Air Handler (CRAH).

Cooling Tower Speed Control

The control logic for cooling tower fan speed is described as:

When in FMC mode, the cooling tower speed is controlled to maintain the condenser water supply temperature (CWST) at its setpoint.
When in PMC mode, the fan is set to run at 100% speed to make the condenser water as cold as possible and maximize the WSE output.
When in FC mode, the fan speed is modulated to maintain chilled water supply temperature at its setpoint.

Detailed implementation of cooling tower speed control can be found in Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingTowerSpeed.

Room temperature control

The room temperature is controlled by adjusting the fan speed of the AHU using a PI controller.

Note that for simplicity, the temperature and differential pressure reset control are not implemented in this example.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PostProcess (Post-processing), Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PartialDataCenter (Partial model that impliments cooling system for data centers).

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model
replaceable package MediumW		Water	Medium model
Integer	numChi	2	Number of chillers
MassFlowRate	m1_flow_chi_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_chi_nominal	18.3	Nominal mass flow rate at evaporator water in the chillers [kg/s]
PressureDifference	dp1_chi_nominal	46.2*1000	Nominal pressure [Pa]
PressureDifference	dp2_chi_nominal	44.8*1000	Nominal pressure [Pa]
Power	QEva_nominal	m2_flow_chi_nominal4200(6....	Nominal cooling capaciaty(Negative means cooling) [W]
MassFlowRate	m1_flow_wse_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_wse_nominal	35.3	Nominal mass flow rate at condenser water in the chillers [kg/s]
PressureDifference	dp1_wse_nominal	33.1*1000	Nominal pressure [Pa]
PressureDifference	dp2_wse_nominal	34.5*1000	Nominal pressure [Pa]
Generic	perPumCW[numChi]		Performance data for condenser water pumps
Time	tWai	1200	Waiting time [s]
ThermalConductance	UA_nominal	numChi*QEva_nominal/Building...	Thermal conductance at nominal flow for sensible heat, used to compute time constant [W/K]
MassFlowRate	mAir_flow_nominal	161.35	Nominal air mass flowrate [kg/s]
Real	yValMinAHU	0.1	Minimum valve openning position [1]
Temperature	TCHWSet	273.15 + 8	Chilled water temperature setpoint [K]
Temperature	TSupAirSet	TCHWSet + 10	Supply air temperature setpoint [K]
Temperature	TRetAirSet	273.15 + 25	Supply air temperature setpoint [K]
Generic	perPumPri[numChi]		Performance data for primary pumps

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IntegratedPrimaryLoadSideEconomizer "Example that demonstrates a chiller plant with integrated primary load side economizer" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PostProcess ( freCooSig(y=if cooModCon.y == Integer(Buildings.Applications.DataCenters.Types.CoolingModes.FreeCooling) then 1 else 0), parMecCooSig(y=if cooModCon.y == Integer(Buildings.Applications.DataCenters.Types.CoolingModes.PartialMechanical) then 1 else 0), fulMecCooSig(y=if cooModCon.y == Integer(Buildings.Applications.DataCenters.Types.CoolingModes.FullMechanical) then 1 else 0), PHVAC(y=cooTow[1].PFan + cooTow[2].PFan + pumCW[1].P + pumCW[2].P + sum( chiWSE.powChi + chiWSE.powPum) + ahu.PFan + ahu.PHea), PIT(y=roo.QSou.Q_flow)); extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PartialDataCenter (redeclare Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimaryLoadSide chiWSE(addPowerToMedium=false, perPum=perPumPri), weaData(filNam="modelica://Buildings/Resources/weatherdata/DRYCOLD.mos")); parameter Buildings.Fluid.Movers.Data.Generic[numChi] perPumPri(each pressure =Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters(V_flow= m2_flow_chi_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(dp2_chi_nominal + dp2_wse_nominal + 18000)*{1.5,1.3,1.0,0.6})) "Performance data for primary pumps"; Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingMode cooModCon( tWai=tWai, deaBan1=1.1, deaBan2=0.5, deaBan3=1.1, deaBan4=0.5) "Cooling mode controller"; Modelica.Blocks.Sources.RealExpression towTApp(y=cooTow[1].TApp_nominal) "Cooling tower approach temperature"; Modelica.Blocks.Sources.RealExpression yVal5(y=if cooModCon.y == Integer( Buildings.Applications.DataCenters.Types.CoolingModes.FullMechanical) then 1 else 0) "On/off signal for valve 5"; Modelica.Blocks.Sources.RealExpression yVal6(y=if cooModCon.y == Integer( Buildings.Applications.DataCenters.Types.CoolingModes.FreeCooling) then 1 else 0) "On/off signal for valve 6"; Modelica.Blocks.Sources.RealExpression cooLoaChi(y=-chiWSE.port_a2.m_flow*4180 *(chiWSE.TCHWSupWSE - TCHWSupSet.y)) "Cooling load in chillers"; equation connect(pumSpeSig.y, chiWSE.yPum); connect(TCHWSup.port_b, ahu.port_a1); connect(chiWSE.TCHWSupWSE, cooModCon.TCHWSupWSE); connect(cooLoaChi.y, chiStaCon.QTot); for i in 1:numChi loop connect(pumCW[i].port_a, TCWSup.port_b); end for; connect(TCHWSupSet.y, cooModCon.TCHWSupSet); connect(towTApp.y, cooModCon.TApp); connect(weaBus.TWetBul.TWetBul, cooModCon.TWetBul); connect(TCHWRet.port_b, chiWSE.port_a2); connect(cooModCon.TCHWRetWSE, TCHWRet.T); connect(dpSet.y, pumSpe.u_s); connect(cooModCon.y, chiStaCon.cooMod); connect(cooModCon.y, intToBoo.u); connect(TCHWSup.T, chiStaCon.TCHWSup); connect(cooModCon.y, sigCha.u); connect(yVal5.y, chiWSE.yVal5); connect(yVal6.y, chiWSE.yVal6); connect(cooModCon.y, cooTowSpeCon.cooMod); connect(cooModCon.y, CWPumCon.cooMod); end IntegratedPrimaryLoadSideEconomizer;

Buildings.Applications.DataCenters.ChillerCooled.Examples.IntegratedPrimarySecondaryEconomizer

Example that demonstrates a chiller plant with integrated primary-secondary side economizer

Buildings.Applications.DataCenters.ChillerCooled.Examples.IntegratedPrimarySecondaryEconomizer

Information

System Configuration

This example demonstrates the implementation of a chiller plant with water-side economizer (WSE) to cool a data center. The system schematics is as shown below.

The system is a primary-secondary chiller plant with two chillers and an integrated WSE.

Control Logic

This section describes the detailed control logic used in this chilled water plant system.

Cooling Mode Control

Chiller Staging Control

The staging sequence of multiple chillers are descibed as below:

The chillers are all off when cooling mode is FC.
One chiller is commanded on when cooling mode is not FC.
Two chillers are commanded on when cooling mode is not FC and the cooling load addressed by chillers is larger than a critical value.

The detailed implementation is shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.ChillerStage.

Pump Staging Control

For constant speed pumps, the number of running pumps equals to the number of running chillers.

For variable speed pumps, the number of running pumps is controlled by the speed signal and the mass flow rate. Details are shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.VariableSpeedPumpStage. And the speed is controlled by maintaining a fixed differential pressure between the outlet and inlet on the waterside of the Computer Room Air Handler (CRAH).

Cooling Tower Speed Control

The control logic for cooling tower fan speed is described as:

When in FMC mode, the cooling tower speed is controlled to maintain the condenser water supply temperature (CWST) at its setpoint.
When in PMC mode, the fan is enabled to run at 100% speed to make the condenser water as cold as possible and maximize the WSE output.
When in FC mode, the fan speed is modulated to maintain chilled water supply temperature at its setpoint.

Detailed implementation of cooling tower speed control can be found in Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingTowerSpeed.

Room temperature control

The room temperature is controlled by adjusting the fan speed of the AHU using a PI controller.

Note that for simplicity, the chilled water supply temperature and differential pressure reset control are not implemented in this example.

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model
replaceable package MediumW		Water	Medium model
Integer	numChi	2	Number of chillers
MassFlowRate	m1_flow_chi_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_chi_nominal	18.3	Nominal mass flow rate at evaporator water in the chillers [kg/s]
PressureDifference	dp1_chi_nominal	46.2*1000	Nominal pressure [Pa]
PressureDifference	dp2_chi_nominal	44.8*1000	Nominal pressure [Pa]
Power	QEva_nominal	m2_flow_chi_nominal4200(6....	Nominal cooling capaciaty(Negative means cooling) [W]
MassFlowRate	m1_flow_wse_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_wse_nominal	35.3	Nominal mass flow rate at condenser water in the chillers [kg/s]
PressureDifference	dp1_wse_nominal	33.1*1000	Nominal pressure [Pa]
PressureDifference	dp2_wse_nominal	34.5*1000	Nominal pressure [Pa]
Generic	perPumCW[numChi]		Performance data for condenser water pumps
Time	tWai	1200	Waiting time [s]
ThermalConductance	UA_nominal	numChi*QEva_nominal/Building...	Thermal conductance at nominal flow for sensible heat, used to compute time constant [W/K]
MassFlowRate	mAir_flow_nominal	161.35	Nominal air mass flowrate [kg/s]
Real	yValMinAHU	0.1	Minimum valve openning position [1]
Temperature	TCHWSet	273.15 + 8	Chilled water temperature setpoint [K]
Temperature	TSupAirSet	TCHWSet + 10	Supply air temperature setpoint [K]
Temperature	TRetAirSet	273.15 + 25	Supply air temperature setpoint [K]
Generic	perPumSec[numChi]		Performance data for secondary chilled water pumps
Generic	perPumPri[numChi]		Performance data for secondary chilled water pumps

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model IntegratedPrimarySecondaryEconomizer "Example that demonstrates a chiller plant with integrated primary-secondary side economizer" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PostProcess ( freCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.FreeCooling) then 1 else 0), parMecCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.PartialMechanical) then 1 else 0), fulMecCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.FullMechanical) then 1 else 0), PHVAC(y=cooTow[1].PFan + cooTow[2].PFan + pumCW[1].P + pumCW[2].P + sum( chiWSE.powChi + chiWSE.powPum) + sum(secPum.P) + ahu.PFan + ahu.PHea), PIT(y=roo.QSou.Q_flow)); extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PartialDataCenter (redeclare Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimarySecondary chiWSE(addPowerToMedium=false, perPum=perPumPri), weaData(filNam="modelica://Buildings/Resources/weatherdata/DRYCOLD.mos")); parameter Buildings.Fluid.Movers.Data.Generic[numChi] perPumSec(each pressure =Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters(V_flow= m1_flow_chi_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(dp1_wse_nominal + 18000) *{1.5,1.3,1.0,0.6})) "Performance data for secondary chilled water pumps"; parameter Buildings.Fluid.Movers.Data.Generic[numChi] perPumPri(each pressure =Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters(V_flow= m1_flow_chi_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(dp1_chi_nominal + 6000)* {1.5,1.3,1.0,0.6})) "Performance data for secondary chilled water pumps"; Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingMode cooModCon( tWai=tWai, deaBan1=1.1, deaBan2=0.5, deaBan3=1.1, deaBan4=0.5) "Cooling mode controller"; Modelica.Blocks.Sources.RealExpression towTApp(y=cooTow[1].TApp_nominal) "Cooling tower approach temperature"; Modelica.Blocks.Sources.RealExpression yVal5(y=if cooModCon.y == Integer( Buildings.Applications.DataCenters.Types.CoolingModes.FullMechanical) then 1 else 0) "On/off signal for valve 5"; Modelica.Blocks.Sources.RealExpression cooLoaChi(y=-chiWSE.port_a2.m_flow*4180 *(chiWSE.TCHWSupWSE - TCHWSupSet.y)) "Cooling load in chillers"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.FlowMachine_y secPum( redeclare package Medium = MediumW, dpValve_nominal=6000, per=perPumSec, addPowerToMedium=false, m_flow_nominal=m2_flow_chi_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Secondary pumps"; Buildings.Applications.DataCenters.ChillerCooled.Controls.ConstantSpeedPumpStage PriPumCon(tWai=0) "Chilled water primary pump controller"; Modelica.Blocks.Math.Gain gai2[numChi](each k=m2_flow_chi_nominal) "Gain effect"; equation connect(yVal5.y, chiWSE.yVal5); connect(cooLoaChi.y, chiStaCon.QTot); connect(TCHWSup.port_b, secPum.port_a); connect(secPum.port_b, ahu.port_a1); connect(pumSpeSig.y, secPum.u); connect(PriPumCon.y, gai2.u); connect(gai2.y, chiWSE.m_flow_in); for i in 1:numChi loop connect(pumCW[i].port_a, TCWSup.port_b); end for; connect(towTApp.y, cooModCon.TApp); connect(weaBus.TWetBul.TWetBul, cooModCon.TWetBul); connect(TCHWRet.port_b, chiWSE.port_a2); connect(cooModCon.TCHWRetWSE, TCHWRet.T); connect(chiWSE.TCHWSupWSE, cooModCon.TCHWSupWSE); connect(TCHWSupSet.y, cooModCon.TCHWSupSet); connect(TCHWSup.T, chiStaCon.TCHWSup); connect(PriPumCon.numOnChi, chiNumOn.y); connect(PriPumCon.cooMod, cooModCon.y); connect(cooTowSpeCon.cooMod, cooModCon.y); connect(intToBoo.u, cooModCon.y); connect(CWPumCon.cooMod, cooModCon.y); connect(cooModCon.y, sigCha.u); connect(cooModCon.y, chiStaCon.cooMod); end IntegratedPrimarySecondaryEconomizer;

Buildings.Applications.DataCenters.ChillerCooled.Examples.NonIntegratedPrimarySecondaryEconomizer

Example that demonstrates a chiller plant with non-integrated primary-secondary side economizer

Buildings.Applications.DataCenters.ChillerCooled.Examples.NonIntegratedPrimarySecondaryEconomizer

Information

System Configuration

This example demonstrates the implementation of a chiller plant with water-side economizer (WSE) to cool a data center. The system schematics is as shown below.

The system is a primary-secondary chiller plant with two chillers and a non-integrated WSE.

Control Logic

This section describes the detailed control logic used in this chilled water plant system.

Cooling Mode Control

The chilled water system with non-integrated waterside economizer can run in two modes: free cooling (FC) mode, and fully mechanical cooling (FMC) mode. The detailed control logics about how to switch between these two cooling modes are described in Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingModeNonIntegrated. Details on how the valves are operated under different cooling modes are presented in Buildings.Applications.DataCenters.ChillerCooled.Equipment.NonIntegrated.

Chiller Staging Control

The staging sequence of multiple chillers are descibed as below:

The chillers are all off when cooling mode is FC.
One chiller is commanded on when cooling mode is not FC.
Two chillers are commanded on when cooling mode is not FC and the cooling load addressed by chillers is larger than a critical value.

The detailed implementation is shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.ChillerStage.

Pump Staging Control

For constant speed pumps, the number of running pumps equals to the number of running chillers.

For variable speed pumps, the number of runing pumps is controlled by the speed signal and the mass flowrate. Details are shown in Buildings.Applications.DataCenters.ChillerCooled.Controls.VariableSpeedPumpStage. And the speed is controlled by maintaining a fixed differential pressure between the outlet and inlet on the waterside of the Computer Room Air Handler (CRAH).

Cooling Tower Speed Control

The control logic for cooling tower fan speed is described as:

When in FMC mode, the cooling tower speed is controlled to maintain the condenser water supply temperature (CWST) at its setpoint.
When in FC mode, the fan speed is modulated to maintain chilled water supply temperature at its setpoint.

Detailed implementation of cooling tower speed control can be found in Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingTowerSpeed.

Room temperature control

The room temperature is controlled by adjusting the fan speed of the AHU using a PI controller.

Note that for simplicity, the temperature and differential pressure reset control are not implemented in this example.

Parameters

Type	Name	Default	Description
replaceable package MediumA		Air	Medium model
replaceable package MediumW		Water	Medium model
Integer	numChi	2	Number of chillers
MassFlowRate	m1_flow_chi_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_chi_nominal	18.3	Nominal mass flow rate at evaporator water in the chillers [kg/s]
PressureDifference	dp1_chi_nominal	46.2*1000	Nominal pressure [Pa]
PressureDifference	dp2_chi_nominal	44.8*1000	Nominal pressure [Pa]
Power	QEva_nominal	m2_flow_chi_nominal4200(6....	Nominal cooling capaciaty(Negative means cooling) [W]
MassFlowRate	m1_flow_wse_nominal	34.7	Nominal mass flow rate at condenser water in the chillers [kg/s]
MassFlowRate	m2_flow_wse_nominal	35.3	Nominal mass flow rate at condenser water in the chillers [kg/s]
PressureDifference	dp1_wse_nominal	33.1*1000	Nominal pressure [Pa]
PressureDifference	dp2_wse_nominal	34.5*1000	Nominal pressure [Pa]
Generic	perPumCW[numChi]		Performance data for condenser water pumps
Time	tWai	1200	Waiting time [s]
ThermalConductance	UA_nominal	numChi*QEva_nominal/Building...	Thermal conductance at nominal flow for sensible heat, used to compute time constant [W/K]
MassFlowRate	mAir_flow_nominal	161.35	Nominal air mass flowrate [kg/s]
Real	yValMinAHU	0.1	Minimum valve openning position [1]
Temperature	TCHWSet	273.15 + 8	Chilled water temperature setpoint [K]
Temperature	TSupAirSet	TCHWSet + 10	Supply air temperature setpoint [K]
Temperature	TRetAirSet	273.15 + 25	Supply air temperature setpoint [K]
Generic	perPumSec[numChi]		Performance data for secondary chilled water pumps
Generic	perPumPri[numChi]		Performance data for secondary chilled water pumps

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model NonIntegratedPrimarySecondaryEconomizer "Example that demonstrates a chiller plant with non-integrated primary-secondary side economizer" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PostProcess ( freCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.FreeCooling) then 1 else 0), parMecCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.PartialMechanical) then 1 else 0), fulMecCooSig(y=if cooModCon.y == integer(Buildings.Applications.DataCenters.Types.CoolingModes.FullMechanical) then 1 else 0), PHVAC(y=cooTow[1].PFan + cooTow[2].PFan + pumCW[1].P + pumCW[2].P + sum( chiWSE.powChi) + sum(priPum.P) + sum(secPum.P) + ahu.PFan + ahu.PHea), PIT(y=roo.QSou.Q_flow)); extends Buildings.Applications.DataCenters.ChillerCooled.Examples.BaseClasses.PartialDataCenter ( redeclare Buildings.Applications.DataCenters.ChillerCooled.Equipment.NonIntegrated chiWSE(controllerType=Modelica.Blocks.Types.SimpleController.PI, Ti=60), weaData(filNam="modelica://Buildings/Resources/weatherdata/DRYCOLD.mos"), CWPumCon(tWai=60), chiStaCon(tWai=60)); parameter Buildings.Fluid.Movers.Data.Generic[numChi] perPumSec(each pressure =Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters(V_flow= m1_flow_chi_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(dp1_wse_nominal + 18000) *{1.5,1.3,1.0,0.6})) "Performance data for secondary chilled water pumps"; parameter Buildings.Fluid.Movers.Data.Generic[numChi] perPumPri(each pressure =Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters(V_flow= m1_flow_chi_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(dp1_chi_nominal + 6000)* {1.5,1.3,1.0,0.6})) "Performance data for secondary chilled water pumps"; Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingModeNonIntegrated cooModCon( tWai=tWai, deaBan=1, TSwi=TCHWSet - 5) "Cooling mode controller"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.FlowMachine_y secPum( redeclare package Medium = MediumW, dpValve_nominal=6000, per=perPumSec, addPowerToMedium=false, m_flow_nominal=m2_flow_chi_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, tau=1, use_inputFilter=true) "Secondary pumps"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.FlowMachine_m priPum( redeclare package Medium = MediumW, dpValve_nominal=6000, per=perPumPri, m_flow_nominal=m2_flow_chi_nominal, addPowerToMedium=false, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, tau=1, use_inputFilter=true) "Constant speed pumps"; Buildings.Applications.DataCenters.ChillerCooled.Controls.ConstantSpeedPumpStage priPumCon(tWai=0) "Chilled water primary pump controller"; Modelica.Blocks.Sources.RealExpression cooLoaChi(y=-ahu.port_a1.m_flow*4180*( TCHWRet.T - TCHWSupSet.y)) "Cooling load in chillers"; inner Modelica.StateGraph.StateGraphRoot stateGraphRoot; Buildings.Fluid.Sensors.MassFlowRate bypFlo(redeclare package Medium = MediumW) "Sensor for bypass flowrate"; equation for i in 1:numChi loop connect(chiOn[i].y, chiWSE.on[i]); end for; connect(TCHWSupSet.y, cooModCon.TCHWSupSet); connect(weaBus.TWetBul.TWetBul, cooModCon.TWetBul); connect(chiStaCon.y, chiOn.u); connect(intToBoo.y, wseOn.u); connect(wseOn.y, chiWSE.on[numChi + 1]); connect(CWPumCon.y, gai.u); connect(dpSet.y, pumSpe.u_s); connect(secPum.port_b, ahu.port_a1); connect(TCHWSup.port_b, secPum.port_a); connect(pumSpeSig.y, secPum.u); connect(cooLoaChi.y, chiStaCon.QTot); connect(TCHWSup.T, cooModCon.TCHWSup); connect(priPum.port_a, TCHWRet.port_b); connect(chiWSE.port_a2, priPum.port_b); connect(priPum.port_a, bypFlo.port_a); connect(bypFlo.port_b, TCHWSup.port_a); connect(TCHWSup.T, chiStaCon.TCHWSup); connect(priPumCon.y, priPum.u); connect(cooModCon.numOnChi, chiNumOn.y); connect(priPumCon.cooMod, cooModCon.y); connect(cooModCon.y, CWPumCon.cooMod); connect(chiStaCon.cooMod, cooModCon.y); connect(cooModCon.y, intToBoo.u); connect(cooModCon.y, sigCha.u); connect(chiNumOn.y, priPumCon.numOnChi); connect(cooModCon.y, cooTowSpeCon.cooMod); end NonIntegratedPrimarySecondaryEconomizer;