Buildings.Experimental.DHC.Plants.Cooling.Examples

Example models integrating multiple components

Information

This package contains advanced examples illustrating the use of the models in Buildings.Experimental.DHC.Plants.Cooling.

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

Package Content

Name Description
Buildings.Experimental.DHC.Plants.Cooling.Examples.ElectricChillerParallel ElectricChillerParallel Example to test the chiller cooling plant

Buildings.Experimental.DHC.Plants.Cooling.Examples.ElectricChillerParallel Buildings.Experimental.DHC.Plants.Cooling.Examples.ElectricChillerParallel

Example to test the chiller cooling plant

Buildings.Experimental.DHC.Plants.Cooling.Examples.ElectricChillerParallel

Information

This model validates the district central cooling plant implemented in Buildings.Experimental.DHC.Plants.Cooling.ElectricChillerParallel.

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

Parameters

TypeNameDefaultDescription
ElectricEIRChiller_York_YT_1055kW_5_96COP_VanesperChiredeclare parameter Building...Performance data of chiller
MassFlowRatemCHW_flow_nominal18.3Nominal chilled water mass flow rate [kg/s]
MassFlowRatemCW_flow_nominal34.7Nominal condenser water mass flow rate [kg/s]
PressureDifferencedpCHW_nominal44.8*1000Nominal chilled water side pressure [Pa]
PressureDifferencedpCW_nominal46.2*1000Nominal condenser water side pressure [Pa]
PowerQChi_nominalmCHW_flow_nominal*4200*(6.67...Nominal cooling capaciaty (Negative means cooling) [W]
MassFlowRatemMin_flow0.03Minimum mass flow rate of single chiller [kg/s]
TemperatureDifferencedTApp3Approach temperature [K]
PowerPFan_nominal5000Fan power [W]
PressuredpSetPoi68900Differential pressure setpoint [Pa]
TemperatureTCHWSet273.15 + 8Chilled water temperature setpoint [K]
TimetWai30Waiting time [s]
GenericperCHWPumperCHWPum(pressure=Buildings...Performance data for chilled water pumps
GenericperCWPumperCWPum(pressure=Buildings....Performance data for condenser water pumps
PressuredpCHWPumVal_nominal6000Nominal pressure drop of chilled water pump valve [Pa]
PressuredpCWPumVal_nominal6000Nominal pressure drop of chilled water pump valve [Pa]
PressureDifferencedpCooTowVal_nominal6000Nominal pressure difference of the cooling tower valve [Pa]
ElectricChillerParallelplapla(perChi=perChi, dTApp=dTA...District cooling plant

Modelica definition

model ElectricChillerParallel "Example to test the chiller cooling plant" extends Modelica.Icons.Example; package Medium=Buildings.Media.Water "Medium model for water"; // chiller and cooling tower replaceable parameter Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_York_YT_1055kW_5_96COP_Vanes perChi "Performance data of chiller"; parameter Modelica.Units.SI.MassFlowRate mCHW_flow_nominal=18.3 "Nominal chilled water mass flow rate"; parameter Modelica.Units.SI.MassFlowRate mCW_flow_nominal=34.7 "Nominal condenser water mass flow rate"; parameter Modelica.Units.SI.PressureDifference dpCHW_nominal=44.8*1000 "Nominal chilled water side pressure"; parameter Modelica.Units.SI.PressureDifference dpCW_nominal=46.2*1000 "Nominal condenser water side pressure"; parameter Modelica.Units.SI.Power QChi_nominal=mCHW_flow_nominal*4200*(6.67 - 18.56) "Nominal cooling capaciaty (Negative means cooling)"; parameter Modelica.Units.SI.MassFlowRate mMin_flow=0.03 "Minimum mass flow rate of single chiller"; parameter Modelica.Units.SI.TemperatureDifference dTApp=3 "Approach temperature"; parameter Modelica.Units.SI.Power PFan_nominal=5000 "Fan power"; // control settings parameter Modelica.Units.SI.Pressure dpSetPoi=68900 "Differential pressure setpoint"; parameter Modelica.Units.SI.Temperature TCHWSet=273.15 + 8 "Chilled water temperature setpoint"; parameter Modelica.Units.SI.Time tWai=30 "Waiting time"; // pumps parameter Buildings.Fluid.Movers.Data.Generic perCHWPum( pressure=Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters( V_flow=mCHW_flow_nominal/1000*{0.2,0.6,0.8,1.0}, dp=(dpCHW_nominal+dpSetPoi+18000+30000)*{1.5,1.3,1.0,0.6})) "Performance data for chilled water pumps"; parameter Buildings.Fluid.Movers.Data.Generic perCWPum( pressure=Buildings.Fluid.Movers.BaseClasses.Characteristics.flowParameters( V_flow=mCW_flow_nominal/1000*{0.2,0.6,1.0,1.2}, dp=(2*dpCW_nominal+60000+6000)*{1.2,1.1,1.0,0.6})) "Performance data for condenser water pumps"; parameter Modelica.Units.SI.Pressure dpCHWPumVal_nominal=6000 "Nominal pressure drop of chilled water pump valve"; parameter Modelica.Units.SI.Pressure dpCWPumVal_nominal=6000 "Nominal pressure drop of chilled water pump valve"; parameter Modelica.Units.SI.PressureDifference dpCooTowVal_nominal=6000 "Nominal pressure difference of the cooling tower valve"; replaceable Buildings.Experimental.DHC.Plants.Cooling.ElectricChillerParallel pla( perChi=perChi, dTApp=dTApp, perCHWPum=perCHWPum, perCWPum=perCWPum, mCHW_flow_nominal=mCHW_flow_nominal, dpCHW_nominal=dpCHW_nominal, QChi_nominal=QChi_nominal, mMin_flow=mMin_flow, mCW_flow_nominal=mCW_flow_nominal, dpCW_nominal=dpCW_nominal, TAirInWB_nominal=298.7, TCW_nominal=308.15, dT_nominal=5.56, TMin=288.15, PFan_nominal=PFan_nominal, dpCooTowVal_nominal=dpCooTowVal_nominal, dpCHWPumVal_nominal=dpCHWPumVal_nominal, dpCWPumVal_nominal=dpCWPumVal_nominal, tWai=tWai, dpSetPoi=dpSetPoi, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "District cooling plant"; Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat( final computeWetBulbTemperature=true, filNam=Modelica.Utilities.Files.loadResource( "modelica://Buildings/Resources/weatherdata/USA_CA_San.Francisco.Intl.AP.724940_TMY3.mos")) "Weather data"; Modelica.Blocks.Sources.BooleanConstant on "On signal of the plant"; Modelica.Blocks.Sources.Constant TCHWSupSet( k=TCHWSet) "Chilled water supply temperature setpoint"; Fluid.MixingVolumes.MixingVolume vol( nPorts=3, redeclare package Medium=Medium, m_flow_nominal=pla.numChi*mCHW_flow_nominal, V=0.5, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume"; Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow fixHeaFlo( T_ref=293.15) "Fixed heat flow rate"; Fluid.FixedResistances.PressureDrop res( redeclare package Medium=Medium, m_flow_nominal=pla.numChi*mCHW_flow_nominal, dp_nominal(displayUnit="kPa") = 1000000) "Flow resistance"; Modelica.Blocks.Sources.Sine loaVar( amplitude=913865, f=1/126900, offset=913865, startTime(displayUnit="h") = 21600) "Variable demand load"; Fluid.Sensors.RelativePressure senRelPre(redeclare package Medium = Medium); equation connect(TCHWSupSet.y,pla.TCHWSupSet); connect(fixHeaFlo.port,vol.heatPort); connect(pla.port_bSerCoo,vol.ports[1]); connect(vol.ports[2],res.port_a); connect(res.port_b,pla.port_aSerCoo); connect(on.y,pla.on); connect(weaDat.weaBus,pla.weaBus); connect(fixHeaFlo.Q_flow,loaVar. y); connect(res.port_b, senRelPre.port_b); connect(vol.ports[3], senRelPre.port_a); connect(senRelPre.p_rel, pla.dpMea); end ElectricChillerParallel;