Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation

Collection of models that validate the Buildings.Applications.DataCenters.ChillerCooled package

Information

This package contains validation models for the classes in Buildings.Applications.DataCenters.ChillerCooled.Equipment.

Note that most validation models contain simple input data which may not be realistic, but for which the correct output can be obtained through an analytic solution. The examples plot various outputs, which have been verified against these solutions. These model outputs are stored as reference data and used for continuous validation whenever models in the library change.

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

Package Content

Name	Description
CoolingCoilHumidifyingHeating_ClosedLoop	Model of a air handling unit that tests temperature and humidity control
CoolingCoilHumidifyingHeating_OpenLoop	Model of a air handling unit that tests variable mass flow rates
ElectricChillerParallel	Model that test electric chiller parallel
ElectricHeater	Test model for ElectricHeater
HeatExchanger	Model that demonstrates use of a waterside economizer with outlet temperature control
IntegratedPrimaryLoadSide	Integrated WSE on the load side in a primary-only chilled water system
IntegratedPrimaryPlantSide	Integrated WSE on the plant side in a primary-only chilled water system
IntegratedPrimarySecondary	Integrated WSE on the load side in a primary-secondary chilled water system
NonIntegrated	Non-integrated WSE in a chilled water system
PumpParallel	Example that tests the model pump parallels
WatersideEconomizer	Validate model Buildings.Applications.DataCenters.ChillerCooled.Equipment.WatersideEconomizer
BaseClasses	Package with base classes for Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.CoolingCoilHumidifyingHeating_ClosedLoop

Model of a air handling unit that tests temperature and humidity control

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.CoolingCoilHumidifyingHeating_ClosedLoop

Information

This model demonstrates the use of Buildings.Applications.DataCenters.ChillerCooled.Equipment.CoolingCoilHumidifyingHeating. The valve on the water-side and the electric heater on the air-side is regulated to track a setpoint temperature for the air outlet based on the step changes in the inlet temperature on the waterside. The humidifier on the air-side is manipulated to control the humidity of the air outlet.

To avoid simultenous cooling (by opening the valve on the water side) and heating (by turning on the heater), a built-in controller is used to turn the reheater on and off. The detailed control logic can be found in Buildings.Applications.DataCenters.ChillerCooled.Controls.Reheat. A setting for this example is shown as following:

The switch point for the valve position, yValSwi is set as yValSwi=yValMin + 0.1, and a deadband 0.05 is used.
The switch point for the difference between the inlet temperature of the reheater and the required outlet temperature setpoint, dTSwi is set to 0, and deaband temperature difference 0.5 Kelvin is used.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialAirHandlerControl (Partial model for testing air hanlders with temperature and humidity control).

Parameters

Type	Name	Default	Description
MassFlowRate	m1_flow_nominal	2.9	Nominal mass flow rate [kg/s]
MassFlowRate	m2_flow_nominal	3.3	Nominal mass flow rate [kg/s]
Temperature	T_a1_nominal	6 + 273.15	Nominal water inlet temperature [K]
Temperature	T_b1_nominal	11 + 273.15	Nominal water outlet temperature [K]
Temperature	T_a2_nominal	26 + 273.15	Nominal air inlet temperature [K]
Temperature	T_b2_nominal	12 + 273.15	Nominal air outlet temperature [K]
ThermalConductance	UA_nominal	m2_flow_nominal1006(T_b2_n...	Thermal conductance at nominal flow for sensible heat, used to compute time constant [W/K]
Real	yValMin	0.4	Minimum position of water-side valves

Modelica definition

model CoolingCoilHumidifyingHeating_ClosedLoop "Model of a air handling unit that tests temperature and humidity control" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialAirHandlerControl ( relHum(k=0.5), sou_1(p=500000), sou_2(nPorts=1), masFra(redeclare package Medium = Medium2), TWat( startTime=1200, offset=273.15 + 13, height=-6)); parameter Modelica.SIunits.ThermalConductance UA_nominal=m2_flow_nominal*1006* (T_b2_nominal - T_a2_nominal)/ Buildings.Fluid.HeatExchangers.BaseClasses.lmtd( T_a1_nominal, T_b1_nominal, T_a2_nominal, T_b2_nominal) "Thermal conductance at nominal flow for sensible heat, used to compute time constant"; parameter Real yValMin=0.4 "Minimum position of water-side valves"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.CoolingCoilHumidifyingHeating ahu( redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, allowFlowReversal1=true, allowFlowReversal2=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, tauEleHea=1, tauHum=1, m1_flow_nominal=m1_flow_nominal, m2_flow_nominal=m2_flow_nominal, UA_nominal=UA_nominal, dpValve_nominal=6000, mWatMax_flow=0.01, perFan(pressure(V_flow=m2_flow_nominal*{0,0.5,1}, dp=300*{1.2,1.12,1})), yValve_start=1, dp1_nominal=3000, dp2_nominal=200, use_inputFilterValve=false, QHeaMax_flow=10000, yValSwi=yValMin + 0.1, yValDeaBan=0.05) "Air handling unit"; Modelica.Blocks.Sources.Constant uFan(k=1) "Control input for fan"; Modelica.Blocks.Sources.Constant masFraSet(k=0.011) "Setpoint mass fraction"; Buildings.Controls.Continuous.LimPID PID( yMax=1, reverseAction=true, Td=120, controllerType=Modelica.Blocks.Types.SimpleController.PI, yMin=yValMin, k=0.5, Ti=60) "PID controller for the water-side valve in air handling units"; equation connect(ahu.port_a2, sou_2.ports[1]); connect(uFan.y, ahu.uFan); connect(ahu.port_b2, temSenAir2.port_a); connect(temSenWat1.port_b, ahu.port_a1); connect(TSet.y, PID.u_s); connect(temSenAir2.T, PID.u_m); connect(PID.y, ahu.uVal); connect(masFraSet.y, ahu.XSet_w); connect(TSet.y, ahu.TSet); connect(ahu.port_b1, temSenWat2.port_a); end CoolingCoilHumidifyingHeating_ClosedLoop;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.CoolingCoilHumidifyingHeating_OpenLoop

Model of a air handling unit that tests variable mass flow rates

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.CoolingCoilHumidifyingHeating_OpenLoop

Information

This model demonstrates the use of Buildings.Applications.DataCenters.ChillerCooled.Equipment.CoolingCoilHumidifyingHeating for different inlet conditions.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialAirHandlerMassFlow (Partial model for testing air handler at variable mass flowrate).

Parameters

Type	Name	Default	Description
MassFlowRate	m1_flow_nominal	2.9	Nominal mass flow rate [kg/s]
MassFlowRate	m2_flow_nominal	3.3	Nominal mass flow rate [kg/s]
Temperature	T_a1_nominal	6 + 273.15	Nominal water inlet temperature [K]
Temperature	T_b1_nominal	11 + 273.15	Nominal water outlet temperature [K]
Temperature	T_a2_nominal	26 + 273.15	Nominal air inlet temperature [K]
Temperature	T_b2_nominal	12 + 273.15	Nominal air outlet temperature [K]
ThermalConductance	UA_nominal	m2_flow_nominal1006(12 - 2...	Thermal conductance at nominal flow for sensible heat, used to compute time constant [W/K]
Real	yValMin	0.4	Minimum position of water-side valves

Modelica definition

model CoolingCoilHumidifyingHeating_OpenLoop "Model of a air handling unit that tests variable mass flow rates" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialAirHandlerMassFlow (sou_2(nPorts=1), relHum(k=0.5)); parameter Modelica.SIunits.ThermalConductance UA_nominal=m2_flow_nominal*1006* (12 - 26)/Buildings.Fluid.HeatExchangers.BaseClasses.lmtd( T_a1_nominal, T_b1_nominal, T_a2_nominal, T_b2_nominal) "Thermal conductance at nominal flow for sensible heat, used to compute time constant"; parameter Real yValMin=0.4 "Minimum position of water-side valves"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.CoolingCoilHumidifyingHeating ahu( redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, allowFlowReversal1=true, allowFlowReversal2=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, yValve_start=0, tauEleHea=1, tauHum=1, m1_flow_nominal=m1_flow_nominal, m2_flow_nominal=m2_flow_nominal, UA_nominal=UA_nominal, dpValve_nominal=6000, QHeaMax_flow=10000, mWatMax_flow=0.01, perFan(pressure(V_flow=m2_flow_nominal*{0,0.5,1}, dp=300*{1.2,1.12,1})), dp1_nominal=3000, dp2_nominal=200, yValSwi=yValMin + 0.05) "Air handling unit"; Buildings.Fluid.Sensors.RelativeHumidityTwoPort senRelHum(redeclare package Medium = Medium2, m_flow_nominal=m2_flow_nominal) "Sensor for relative humidity"; Modelica.Blocks.Sources.Constant uVal(k=0.2) "Control signal for water valve"; Modelica.Blocks.Sources.Constant temSet(k=15 + 273.15) "Temperature setpoint "; Modelica.Blocks.Sources.Constant XSet(k=0.01) "Mass fraction set point"; Modelica.Blocks.Sources.Constant uFan(k=1) "Control input for fan"; equation connect(ahu.port_a2, sou_2.ports[1]); connect(ahu.port_b2, senRelHum.port_a); connect(uVal.y, ahu.uVal); connect(uFan.y, ahu.uFan); connect(temSet.y, ahu.TSet); connect(XSet.y, ahu.XSet_w); connect(temSenAir2.port_a, senRelHum.port_b); connect(temSenWat1.port_b, ahu.port_a1); connect(temSenWat2.port_a, ahu.port_b1); end CoolingCoilHumidifyingHeating_OpenLoop;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.ElectricChillerParallel

Model that test electric chiller parallel

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.ElectricChillerParallel

Information

This example demonstrates how the chiller parallel can operate under different performance curves.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.Chillers.Examples.BaseClasses.PartialElectric (Base class for test model of chiller electric EIR).

Parameters

Type	Name	Default	Description
Power	P_nominal	-per1.QEva_flow_nominal/per1...	Nominal compressor power (at y=1) [W]
TemperatureDifference	dTEva_nominal	10	Temperature difference evaporator inlet-outlet [K]
TemperatureDifference	dTCon_nominal	10	Temperature difference condenser outlet-inlet [K]
Real	COPc_nominal	3	Chiller COP
MassFlowRate	mEva_flow_nominal	per1.mEva_flow_nominal	Nominal mass flow rate at evaporator [kg/s]
MassFlowRate	mCon_flow_nominal	per1.mCon_flow_nominal	Nominal mass flow rate at condenser [kg/s]
ElectricEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes	per1		Chiller performance data
ElectricEIRChiller_York_YT_563kW_10_61COP_Vanes	per2		Chiller performance data

Modelica definition

model ElectricChillerParallel "Model that test electric chiller parallel" extends Modelica.Icons.Example; extends Buildings.Fluid.Chillers.Examples.BaseClasses.PartialElectric( P_nominal=-per1.QEva_flow_nominal/per1.COP_nominal, mEva_flow_nominal=per1.mEva_flow_nominal, mCon_flow_nominal=per1.mCon_flow_nominal, sou1(nPorts=1, m_flow=2*mCon_flow_nominal), sou2(nPorts=1, m_flow=2*mEva_flow_nominal)); parameter Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes per1 "Chiller performance data"; parameter Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_York_YT_563kW_10_61COP_Vanes per2 "Chiller performance data"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.ElectricChillerParallel chiPar( num=2, redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, m1_flow_nominal=mEva_flow_nominal, m2_flow_nominal=mCon_flow_nominal, dp1_nominal=6000, dp2_nominal=6000, dpValve_nominal={6000,6000}, per={per1,per2}) "Identical chillers"; equation connect(chiPar.port_b1, res1.port_a); connect(chiPar.port_a1, sou1.ports[1]); connect(res2.port_a, chiPar.port_b2); connect(chiPar.port_a2, sou2.ports[1]); connect(greaterThreshold.y, chiPar.on[1]); connect(greaterThreshold.y, chiPar.on[2]); connect(TSet.y, chiPar.TSet); end ElectricChillerParallel;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.ElectricHeater

Test model for ElectricHeater

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.ElectricHeater

Information

This model test the electric heater model: Buildings.Applications.DataCenters.ChillerCooled.Equipment.ElectricHeater.

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.HeatExchangers.Examples.BaseClasses.Heater (Base class for example model for the heater and cooler).

Parameters

Type	Name	Default	Description
replaceable package Medium		PartialMedium	Medium model
Volume	V	662.7	Volume [m3]
MassFlowRate	m_flow_nominal	V1.26/3600	Nominal mass flow rate [kg/s]
HeatFlowRate	Q_flow_nominal	3066	Nominal heat loss of the room [W]

Connectors

Type	Name	Description
replaceable package Medium		Medium model

Modelica definition

model ElectricHeater "Test model for ElectricHeater" extends Modelica.Icons.Example; extends Buildings.Fluid.HeatExchangers.Examples.BaseClasses.Heater( redeclare package Medium = Buildings.Media.Air, m_flow_nominal=V*1.2*6/3600, Q_flow_nominal=30*6*6, mov(nominalValuesDefineDefaultPressureCurve=true, dp_nominal=1200)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.ElectricHeater eleHea( redeclare package Medium = Medium, m_flow_nominal=m_flow_nominal, QMax_flow=Q_flow_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, dp_nominal=1000, eta=0.95) "Electric heater"; Buildings.Controls.SetPoints.Table tab(table=[0, 273.15 + 15; 1, 273.15 + 30]) "Temperature set point"; Modelica.Blocks.Sources.BooleanStep uHea(startTime(displayUnit="min") = 60000) "On/off signal"; equation connect(mov.port_b, eleHea.port_a); connect(eleHea.port_b, THeaOut.port_a); connect(conPI.y, tab.u); connect(tab.y, eleHea.TSet); connect(uHea.y, eleHea.on); end ElectricHeater;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.HeatExchanger

Model that demonstrates use of a waterside economizer with outlet temperature control

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.HeatExchanger

Information

This example demonstrates how the parameter use_controller influences the temperautre at port_b2. The temperature at port_b2 can be controlled in hex1 where the controller is activated.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Type	Name	Default	Description
MassFlowRate	m1_flow_nominal	1000*0.01035	Nominal mass flow rate at evaporator [kg/s]
MassFlowRate	m2_flow_nominal	1000*0.01035	Nominal mass flow rate at condenser [kg/s]
Pressure	dp1_nominal	60000	Nominal pressure difference on medium 1 side [Pa]
Pressure	dp2_nominal	60000	Nominal pressure difference on medium 2 side [Pa]

Modelica definition

model HeatExchanger "Model that demonstrates use of a waterside economizer with outlet temperature control" extends Modelica.Icons.Example; package MediumW = Buildings.Media.Water "Medium model"; parameter Modelica.SIunits.MassFlowRate m1_flow_nominal=1000*0.01035 "Nominal mass flow rate at evaporator"; parameter Modelica.SIunits.MassFlowRate m2_flow_nominal=1000*0.01035 "Nominal mass flow rate at condenser"; parameter Modelica.SIunits.Pressure dp1_nominal=60000 "Nominal pressure difference on medium 1 side"; parameter Modelica.SIunits.Pressure dp2_nominal=60000 "Nominal pressure difference on medium 2 side"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.HeatExchanger hex1 ( m1_flow_nominal=m1_flow_nominal, m2_flow_nominal=m2_flow_nominal, eta=0.8, dp1_nominal=dp1_nominal, dp2_nominal=dp2_nominal, T_start=273.15 + 10, use_controller=true, redeclare package Medium1 = MediumW, redeclare package Medium2 = MediumW, Ti=40, controllerType=Modelica.Blocks.Types.SimpleController.PI, k=0.1, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Water-to-water heat exchanger with built-in PID controller to control the temperature at port_b2"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.HeatExchanger hex2 ( m1_flow_nominal=m1_flow_nominal, m2_flow_nominal=m2_flow_nominal, eta=0.8, dp1_nominal=dp1_nominal, dp2_nominal=dp2_nominal, T_start=273.15 + 10, redeclare package Medium1 = MediumW, redeclare package Medium2 = MediumW, use_controller=false) "Water-to-water heat exchanger without built-in controllers to control the temperature at port_b2"; Buildings.Fluid.Sources.FixedBoundary sin1(nPorts=2, redeclare package Medium = MediumW) "Sink on medium 1 side"; Buildings.Fluid.Sources.MassFlowSource_T sou1( use_T_in=true, nPorts=2, redeclare package Medium = MediumW, m_flow=2*m1_flow_nominal, T=298.15) "Source on medium 1 side"; Modelica.Blocks.Sources.TimeTable TCon_in( table=[0, 273.15 + 12.78; 7200, 273.15 + 12.78; 7200, 273.15 + 18.33; 14400, 273.15 + 18.33; 14400, 273.15 + 26.67], offset=0, startTime=0) "Condenser inlet temperature"; Buildings.Fluid.Sources.FixedBoundary sin2(nPorts=2, redeclare package Medium = MediumW) "Sink on medium 2 side"; Buildings.Fluid.Sources.MassFlowSource_T sou2_2( nPorts=1, redeclare package Medium = MediumW, m_flow=m2_flow_nominal, use_T_in=true) "Source on medium 2 side"; Modelica.Blocks.Sources.Constant TEva_in(k=273.15 + 25.28) "Evaporator inlet temperature"; Buildings.Fluid.Sensors.TemperatureTwoPort TSen1(m_flow_nominal= m2_flow_nominal, redeclare package Medium = MediumW) "Temperature sensor"; Buildings.Fluid.Sensors.TemperatureTwoPort TSen2(redeclare package Medium = MediumW, m_flow_nominal=m2_flow_nominal) "Temperature sensor"; Modelica.Blocks.Sources.Constant TSet(k( unit="K", displayUnit="degC") = 273.15 + 16.56) "Leaving chilled water temperature setpoint"; Buildings.Fluid.Sources.MassFlowSource_T sou2_1( nPorts=1, redeclare package Medium = MediumW, m_flow=m2_flow_nominal, use_T_in=true) "Source on medium 2 side"; Modelica.Blocks.Sources.Constant TEva_in1(k=273.15 + 25.28) "Evaporator inlet temperature"; equation connect(TSet.y, hex1.TSet); connect(sou1.ports[1], hex1.port_a1); connect(hex1.port_b1, sin1.ports[1]); connect(TCon_in.y, sou1.T_in); connect(sou2_2.T_in, TEva_in.y); connect(hex1.port_b2, TSen1.port_a); connect(TSen1.port_b, sin2.ports[1]); connect(sou1.ports[2], hex2.port_a1); connect(hex2.port_b2, TSen2.port_a); connect(TSen2.port_b, sin2.ports[2]); connect(hex2.port_b1, sin1.ports[2]); connect(hex2.port_a2, sou2_2.ports[1]); connect(hex1.port_a2, sou2_1.ports[1]); connect(TEva_in1.y, sou2_1.T_in); end HeatExchanger;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimaryLoadSide

Integrated WSE on the load side in a primary-only chilled water system

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimaryLoadSide

Information

This example demonstrates how the model responses according to different cooling mode signals (free cooling mode, partially mechanical cooling and fully mechanical cooling).

Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant (Partial examples for Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation).

Parameters

Type	Name	Default	Description
MassFlowRate	mCHW_flow_nominal	2567.11000/(420010)	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	2567.11000/(42008.5)	Nominal mass flow rate at condenser water [kg/s]
PressureDifference	dpCHW_nominal	40000	Nominal pressure [Pa]
PressureDifference	dpCW_nominal	40000	Nominal pressure [Pa]
Integer	numChi	1	Number of chillers
Generic	perPum[numChi]		Pump performance data

Modelica definition

model IntegratedPrimaryLoadSide "Integrated WSE on the load side in a primary-only chilled water system" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant ( sou1(nPorts=1), sin1(nPorts=1), TSet(k=273.15 + 5.56), TEva_in(k=273.15 + 15.28)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimaryLoadSide intWSEPri( m1_flow_chi_nominal=mCW_flow_nominal, m2_flow_chi_nominal=mCHW_flow_nominal, m1_flow_wse_nominal=mCW_flow_nominal, m2_flow_wse_nominal=mCHW_flow_nominal, redeclare package Medium1 = MediumCW, redeclare package Medium2 = MediumCHW, dp1_chi_nominal=dpCW_nominal, dp1_wse_nominal=dpCW_nominal, dp2_chi_nominal=dpCHW_nominal, dp2_wse_nominal=dpCHW_nominal, controllerType=Modelica.Blocks.Types.SimpleController.PI, redeclare Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_Trane_CVHF_2567kW_11_77COP_VSD perChi, k=0.4, Ti=80, perPum=perPum, numChi=numChi, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Integrated waterside economizer on the load side of the primary-only chilled water system"; Modelica.Blocks.Sources.Constant yPum(k=1) "Conrol signal for pumps"; Modelica.Blocks.Sources.RealExpression yVal5(y=if onChi.y and not onWSE.y then 1 else 0) "On/off signal for valve 5"; Modelica.Blocks.Sources.RealExpression yVal6(y=if not onChi.y and onWSE.y then 1 else 0) "On/off signal for valve 6"; Modelica.Blocks.Sources.BooleanStep onChi(startTime(displayUnit="h") = 7200) "On and off signal for the chiller"; Modelica.Blocks.Sources.BooleanStep onWSE(startTime(displayUnit="h") = 14400, startValue=true) "On and off signal for the WSE"; Buildings.Fluid.Sources.Boundary_pT sou2( redeclare package Medium = MediumCHW, nPorts=1, use_T_in=true) "Source on medium 2 side"; equation connect(onChi.y, intWSEPri.on[1]); connect(onWSE.y, intWSEPri.on[2]); connect(TSet.y, intWSEPri.TSet); connect(yVal5.y, intWSEPri.yVal5); connect(yVal6.y, intWSEPri.yVal6); connect(yPum.y, intWSEPri.yPum[1]); connect(intWSEPri.port_a1, sou1.ports[1]); connect(intWSEPri.port_b2, TSup.port_a); connect(intWSEPri.port_b1, sin1.ports[1]); connect(intWSEPri.port_a2, sou2.ports[1]); connect(TEva_in.y, sou2.T_in); end IntegratedPrimaryLoadSide;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimaryPlantSide

Integrated WSE on the plant side in a primary-only chilled water system

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimaryPlantSide

Information

This example demonstrates how the model responses according to different cooling mode signals (free cooling mode, partially mechanical cooling and fully mechanical cooling).

Parameters

Type	Name	Default	Description
MassFlowRate	mCHW_flow_nominal	2567.11000/(420010)	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	2567.11000/(42008.5)	Nominal mass flow rate at condenser water [kg/s]
PressureDifference	dpCHW_nominal	40000	Nominal pressure [Pa]
PressureDifference	dpCW_nominal	40000	Nominal pressure [Pa]
Integer	numChi	1	Number of chillers
Generic	perPum[numChi]		Pump performance data

Modelica definition

model IntegratedPrimaryPlantSide "Integrated WSE on the plant side in a primary-only chilled water system" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant ( sou1(nPorts=1), sin1(nPorts=1), TSet(k=273.15 + 5.56), TEva_in(k=273.15 + 15.28)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimaryPlantSide intWSEPri( m1_flow_chi_nominal=mCW_flow_nominal, m2_flow_chi_nominal=mCHW_flow_nominal, m1_flow_wse_nominal=mCW_flow_nominal, m2_flow_wse_nominal=mCHW_flow_nominal, redeclare package Medium1 = MediumCW, redeclare package Medium2 = MediumCHW, dp1_chi_nominal=dpCW_nominal, dp1_wse_nominal=dpCW_nominal, dp2_chi_nominal=dpCHW_nominal, dp2_wse_nominal=dpCHW_nominal, controllerType=Modelica.Blocks.Types.SimpleController.PI, redeclare Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_Trane_CVHF_2567kW_11_77COP_VSD perChi, k=0.4, Ti=80, numChi=numChi, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Integrated waterside economizer in the primary-only chilled water system"; Modelica.Blocks.Sources.RealExpression yVal5(y=if onChi.y and not onWSE.y then 1 else 0) "On/off signal for valve 5"; Modelica.Blocks.Sources.RealExpression yVal6(y=if not onChi.y and onWSE.y then 1 else 0) "On/off signal for valve 6"; Modelica.Blocks.Sources.BooleanStep onChi(startTime(displayUnit="h") = 7200) "On and off signal for the chiller"; Modelica.Blocks.Sources.BooleanStep onWSE(startTime(displayUnit="h") = 14400, startValue=true) "On and off signal for the WSE"; Buildings.Fluid.Sources.MassFlowSource_T sou2( redeclare package Medium = MediumCHW, m_flow=mCHW_flow_nominal, nPorts=1, use_T_in=true) "Source on medium 2 side"; equation connect(onChi.y, intWSEPri.on[1]); connect(onWSE.y, intWSEPri.on[2]); connect(TSet.y, intWSEPri.TSet); connect(yVal5.y, intWSEPri.yVal5); connect(yVal6.y, intWSEPri.yVal6); connect(intWSEPri.port_a1, sou1.ports[1]); connect(intWSEPri.port_b2, TSup.port_a); connect(intWSEPri.port_b1, sin1.ports[1]); connect(intWSEPri.port_a2, sou2.ports[1]); connect(TEva_in.y, sou2.T_in); end IntegratedPrimaryPlantSide;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimarySecondary

Integrated WSE on the load side in a primary-secondary chilled water system

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.IntegratedPrimarySecondary

Information

This example demonstrates how the model responses according to different cooling mode signals (free cooling mode, partially mechanical cooling and fully mechanical cooling).

Parameters

Type	Name	Default	Description
MassFlowRate	mCHW_flow_nominal	2567.11000/(420010)	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	2567.11000/(42008.5)	Nominal mass flow rate at condenser water [kg/s]
PressureDifference	dpCHW_nominal	40000	Nominal pressure [Pa]
PressureDifference	dpCW_nominal	40000	Nominal pressure [Pa]
Integer	numChi	1	Number of chillers
Generic	perPum[numChi]		Pump performance data

Modelica definition

model IntegratedPrimarySecondary "Integrated WSE on the load side in a primary-secondary chilled water system" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant ( sou1(nPorts=1), sin1(nPorts=1), TSet(k=273.15 + 5.56), TEva_in(k=273.15 + 10.28)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.IntegratedPrimarySecondary intWSEPriSec( m1_flow_chi_nominal=mCW_flow_nominal, m2_flow_chi_nominal=mCHW_flow_nominal, m1_flow_wse_nominal=mCW_flow_nominal, m2_flow_wse_nominal=mCHW_flow_nominal, redeclare package Medium1 = MediumCW, redeclare package Medium2 = MediumCHW, dp1_chi_nominal=dpCW_nominal, dp1_wse_nominal=dpCW_nominal, dp2_chi_nominal=dpCHW_nominal, dp2_wse_nominal=dpCHW_nominal, controllerType=Modelica.Blocks.Types.SimpleController.PI, redeclare Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_Trane_CVHF_2567kW_11_77COP_VSD perChi, k=0.4, Ti=80, numChi=numChi, addPowerToMedium=false, show_T=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Integrated waterside economizer on the load side of a primary-secondary chilled water system"; Modelica.Blocks.Sources.RealExpression yVal5(y=if onChi.y and not onWSE.y then 1 else 0) "On/off signal for valve 5"; Modelica.Blocks.Sources.BooleanStep onChi(startTime=7200) "On and off signal for the chiller"; Modelica.Blocks.Sources.BooleanStep onWSE(startTime=14400, startValue=true) "On and off signal for the WSE"; Modelica.Blocks.Sources.RealExpression yPum(y=if onChi.y then mCHW_flow_nominal else 0) "Input signal for primary pump"; Buildings.Fluid.Sources.MassFlowSource_T sou2( redeclare package Medium = MediumCHW, m_flow=0.8*mCHW_flow_nominal, nPorts=1, use_T_in=true) "Source on medium 2 side"; equation connect(onChi.y, intWSEPriSec.on[1]); connect(onWSE.y, intWSEPriSec.on[2]); connect(TSet.y, intWSEPriSec.TSet); connect(yVal5.y, intWSEPriSec.yVal5); connect(intWSEPriSec.port_a1, sou1.ports[1]); connect(intWSEPriSec.port_b2, TSup.port_a); connect(intWSEPriSec.port_b1, sin1.ports[1]); connect(intWSEPriSec.port_a2, sou2.ports[1]); connect(yPum.y, intWSEPriSec.m_flow_in[1]); connect(TEva_in.y, sou2.T_in); end IntegratedPrimarySecondary;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.NonIntegrated

Non-integrated WSE in a chilled water system

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.NonIntegrated

Information

This example demonstrates how the model responses according to different cooling mode signals (free cooling mode, and fully mechanical cooling).

Parameters

Type	Name	Default	Description
MassFlowRate	mCHW_flow_nominal	2567.11000/(420010)	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	2567.11000/(42008.5)	Nominal mass flow rate at condenser water [kg/s]
PressureDifference	dpCHW_nominal	40000	Nominal pressure [Pa]
PressureDifference	dpCW_nominal	40000	Nominal pressure [Pa]
Integer	numChi	1	Number of chillers
Generic	perPum[numChi]		Pump performance data

Modelica definition

model NonIntegrated "Non-integrated WSE in a chilled water system" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant ( sou1(nPorts=1), sin1(nPorts=1), TSet(k=273.15 + 5.56), TEva_in(k=273.15 + 15.28)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.NonIntegrated nonIntWSE( m1_flow_chi_nominal=mCW_flow_nominal, m2_flow_chi_nominal=mCHW_flow_nominal, m1_flow_wse_nominal=mCW_flow_nominal, m2_flow_wse_nominal=mCHW_flow_nominal, redeclare package Medium1 = MediumCW, redeclare package Medium2 = MediumCHW, dp1_chi_nominal=dpCW_nominal, dp1_wse_nominal=dpCW_nominal, dp2_chi_nominal=dpCHW_nominal, dp2_wse_nominal=dpCHW_nominal, controllerType=Modelica.Blocks.Types.SimpleController.PI, redeclare Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_Trane_CVHF_2567kW_11_77COP_VSD perChi, k=0.4, Ti=80, numChi=numChi, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Non-integrated waterside economizer "; Modelica.Blocks.Sources.BooleanStep onChi(startTime=7200) "On and off signal for the chiller"; Modelica.Blocks.Sources.BooleanStep onWSE(startValue=true, startTime( displayUnit="h") = 7200) "On and off signal for the WSE"; Buildings.Fluid.Sources.MassFlowSource_T sou2( redeclare package Medium = MediumCHW, m_flow=mCHW_flow_nominal, nPorts=1, use_T_in=true) "Source on medium 2 side"; equation connect(onChi.y, nonIntWSE.on[1]); connect(onWSE.y, nonIntWSE.on[2]); connect(TSet.y, nonIntWSE.TSet); connect(nonIntWSE.port_a1, sou1.ports[1]); connect(nonIntWSE.port_b2, TSup.port_a); connect(nonIntWSE.port_b1, sin1.ports[1]); connect(nonIntWSE.port_a2, sou2.ports[1]); connect(TEva_in.y, sou2.T_in); end NonIntegrated;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.PumpParallel

Example that tests the model pump parallels

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.PumpParallel

Information

This example demonstrates the use of the flow model with two different configurations. At steady-state, all flow models have the same mass flow rate and pressure difference.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Type	Name	Default	Description
Integer	numPum	2	The number of pumps
MassFlowRate	m_flow_nominal	6000/3600*1.2	Nominal mass flow rate [kg/s]
Real	thr1	1E-4	Threshold for shutoff valves in parallel 1
Real	thr2	thr1*m_flow_nominal	Threshold for shutoff valves in parallel 2

Modelica definition

model PumpParallel "Example that tests the model pump parallels" extends Modelica.Icons.Example; package MediumW = Buildings.Media.Water "Medium model"; parameter Integer numPum=2 "The number of pumps"; parameter Modelica.SIunits.MassFlowRate m_flow_nominal=6000/3600*1.2 "Nominal mass flow rate"; parameter Real thr1=1E-4 "Threshold for shutoff valves in parallel 1"; parameter Real thr2=thr1*m_flow_nominal "Threshold for shutoff valves in parallel 2"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.FlowMachine_y pumPar1( num=numPum, redeclare package Medium = MediumW, dpValve_nominal=6000, redeclare each Buildings.Fluid.Movers.Data.Pumps.Wilo.Stratos32slash1to12 per, m_flow_nominal=m_flow_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, threshold=thr1, tau=1, use_inputFilter=false) "Pumps with speed controlled"; Buildings.Fluid.FixedResistances.PressureDrop dp2( from_dp=true, redeclare package Medium = MediumW, dp_nominal=3000, m_flow_nominal=6000/3600*1.2) "Pressure drop"; Buildings.Fluid.FixedResistances.PressureDrop dp1( from_dp=true, m_flow_nominal=6000/3600*1.2, dp_nominal=300, redeclare package Medium = MediumW) "Pressure drop"; Buildings.Fluid.Sources.Boundary_pT sou( use_p_in=false, nPorts=2, redeclare package Medium = MediumW, p=101325, T=293.15) "Source"; Buildings.Fluid.Sources.Boundary_pT sin( use_p_in=false, nPorts=2, redeclare package Medium = MediumW, p=101325, T=293.15) "Sink"; Modelica.Blocks.Sources.Pulse y[numPum]( each amplitude=1, each width=50, each period=120, each offset=0, each startTime=0) "Input signal"; Buildings.Applications.DataCenters.ChillerCooled.Equipment.FlowMachine_m pumPar2( num=numPum, redeclare package Medium = MediumW, dpValve_nominal=6000, redeclare each Buildings.Fluid.Movers.Data.Pumps.Wilo.Stratos32slash1to12 per, m_flow_nominal=m_flow_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, threshold=thr2, tau=1) "Pumps with m_flow controlled"; Buildings.Fluid.FixedResistances.PressureDrop dp3( from_dp=true, m_flow_nominal=6000/3600*1.2, dp_nominal=300, redeclare package Medium = MediumW) "Pressure drop"; Buildings.Fluid.FixedResistances.PressureDrop dp4( from_dp=true, redeclare package Medium = MediumW, dp_nominal=3000, m_flow_nominal=6000/3600*1.2) "Pressure drop"; equation connect(dp2.port_a, pumPar1.port_b); connect(dp1.port_b, pumPar1.port_a); connect(sou.ports[1], dp1.port_a); connect(y.y, pumPar1.u); connect(dp3.port_a, sou.ports[2]); connect(dp3.port_b, pumPar2.port_a); connect(pumPar2.port_b, dp4.port_a); connect(dp4.port_b, sin.ports[1]); connect(y.y, pumPar2.u); connect(dp2.port_b, sin.ports[2]); end PumpParallel;

Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.WatersideEconomizer

Validate model Buildings.Applications.DataCenters.ChillerCooled.Equipment.WatersideEconomizer

Information

This example demonstrates that the temperature at port_b2 is controlled by setting use_controller=true.

Parameters

Type	Name	Default	Description
MassFlowRate	mCHW_flow_nominal	2567.11000/(420010)	Nominal mass flow rate at chilled water [kg/s]
MassFlowRate	mCW_flow_nominal	2567.11000/(42008.5)	Nominal mass flow rate at condenser water [kg/s]
PressureDifference	dpCHW_nominal	40000	Nominal pressure [Pa]
PressureDifference	dpCW_nominal	40000	Nominal pressure [Pa]
Integer	numChi	1	Number of chillers
Generic	perPum[numChi]		Pump performance data

Modelica definition

model WatersideEconomizer "Validate model Buildings.Applications.DataCenters.ChillerCooled.Equipment.WatersideEconomizer" extends Modelica.Icons.Example; extends Buildings.Applications.DataCenters.ChillerCooled.Equipment.Validation.BaseClasses.PartialPlant ( sou1(nPorts=1), sin1(nPorts=1), TSet(k=273.15 + 13.56), TEva_in(k=273.15 + 15.28)); Buildings.Applications.DataCenters.ChillerCooled.Equipment.WatersideEconomizer WSE( redeclare package Medium1 = MediumCW, redeclare package Medium2 = MediumCHW, controllerType=Modelica.Blocks.Types.SimpleController.PI, k=0.4, Ti=80, m1_flow_nominal=mCW_flow_nominal, m2_flow_nominal=mCHW_flow_nominal, eta=0.8, dp1_nominal=dpCW_nominal, dp2_nominal=dpCHW_nominal, use_controller=true, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Waterside economizer"; Modelica.Blocks.Sources.BooleanStep onWSE(startValue=true, startTime=7200) "On and off signal for the WSE"; Buildings.Fluid.Sources.MassFlowSource_T sou2( redeclare package Medium = MediumCHW, m_flow=mCHW_flow_nominal, nPorts=1, use_T_in=true) "Source on medium 2 side"; equation connect(TSet.y, WSE.TSet); connect(WSE.port_a1, sou1.ports[1]); connect(WSE.port_b2, TSup.port_a); connect(WSE.port_b1, sin1.ports[1]); connect(WSE.port_a2, sou2.ports[1]); connect(WSE.on[1], onWSE.y); connect(TEva_in.y, sou2.T_in); end WatersideEconomizer;