modelContinuousTimeControl

Model of data center that approximates the trim and respond logic
Diagram of ContinuousTimeControlOpen the diagram
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Extends from Buildings.Examples.ChillerPlant.DataCenter.BaseClasses.DataCenter (Primary only chiller plant system with water-side economizer), Modelica.Icons.Example (Icon for runnable examples).

Information

This model is the chilled water plant with continuous time control. The trim and respond logic is approximated by a PI controller which significantly reduces computing time. The model is described at Buildings.Examples.ChillerPlant.DataCenter.

See Buildings.Examples.ChillerPlant.DataCenter.DiscreteTimeControl for an implementation with the discrete time trim and respond logic.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.MassFlowRatemAir_flow_nominal (from DataCenter)roo.QRoo_flow/(1005*15)Nominal mass flow rate at fan
Modelica.Units.SI.PowerP_nominal (from DataCenter)80E3Nominal compressor power (at y=1)
Modelica.Units.SI.TemperatureDifferencedTEva_nominal (from DataCenter)10Temperature difference evaporator inlet-outlet
Modelica.Units.SI.TemperatureDifferencedTCon_nominal (from DataCenter)10Temperature difference condenser outlet-inlet
RealCOPc_nominal (from DataCenter)3Chiller COP
Modelica.Units.SI.MassFlowRatemCHW_flow_nominal (from DataCenter)2*roo.QRoo_flow/(4200*20)Nominal mass flow rate at chilled water
Modelica.Units.SI.MassFlowRatemCW_flow_nominal (from DataCenter)2*roo.QRoo_flow/(4200*6)Nominal mass flow rate at condenser water
Modelica.Units.SI.PressureDifferencedp_nominal (from DataCenter)500Nominal pressure difference
Fluid.HeatExchangers.CoolingTowers.Data.YorkCalc.GenericdatTow (from DataCenter)Performance data for cooling tower

Connectors

TypeNameDefaultDescription
BoundaryConditions.WeatherData.BusweaBus (from DataCenter)

Components

TypeNameDefaultDescription
Buildings.Fluid.Movers.FlowControlled_m_flowfan (from DataCenter)Fan for air flow through the data center
Buildings.Fluid.HeatExchangers.DryCoilCounterFlowcooCoi (from DataCenter)Cooling coil
Modelica.Blocks.Sources.ConstantmFanFlo (from DataCenter)Mass flow rate of fan
BaseClasses.SimplifiedRoomroo (from DataCenter)Room model
Buildings.Fluid.Movers.FlowControlled_dppumCHW (from DataCenter)Chilled water pump
Buildings.Fluid.Storage.ExpansionVesselexpVesCHW (from DataCenter)Expansion vessel
Buildings.Fluid.HeatExchangers.CoolingTowers.YorkCalccooTow (from DataCenter)Cooling tower
Buildings.Fluid.Movers.FlowControlled_m_flowpumCW (from DataCenter)Condenser water pump
Buildings.Fluid.HeatExchangers.ConstantEffectivenesswse (from DataCenter)Water side economizer (Heat exchanger)
Buildings.Fluid.Actuators.Valves.TwoWayLinearval5 (from DataCenter)Control valve for condenser water loop of chiller
Buildings.Fluid.Actuators.Valves.TwoWayLinearval1 (from DataCenter)Bypass control valve for economizer. 1: disable economizer, 0: enable economizer
Buildings.Fluid.Storage.ExpansionVesselexpVesChi (from DataCenter)
Buildings.Examples.ChillerPlant.DataCenter.BaseClasses.Controls.WSEControlwseCon (from DataCenter)
Modelica.Blocks.Sources.RealExpressionexpTowTApp (from DataCenter)Cooling tower approach
Buildings.Fluid.Chillers.ElectricEIRchi (from DataCenter)
Buildings.Fluid.Actuators.Valves.TwoWayLinearval6 (from DataCenter)Control valve for chilled water leaving from chiller
Buildings.Examples.ChillerPlant.DataCenter.BaseClasses.Controls.ChillerSwitchchiSwi (from DataCenter)Control unit switching chiller on or off
Buildings.Examples.ChillerPlant.DataCenter.BaseClasses.Controls.LinearPiecewiseTwolinPieTwo (from DataCenter)Translate the control signal for chiller setpoint reset
Modelica.Blocks.Sources.ConstantTAirSet (from DataCenter)Set temperature for air supply to the room
Modelica.Blocks.Math.BooleanToRealchiCon (from DataCenter)Control signal for chiller
Buildings.Fluid.Actuators.Valves.TwoWayLinearval4 (from DataCenter)Control valve for condenser water loop of economizer
Buildings.Fluid.Sensors.TemperatureTwoPortTAirSup (from DataCenter)Supply air temperature to data center
Buildings.Fluid.Sensors.TemperatureTwoPortTCHWEntChi (from DataCenter)Temperature of chilled water entering chiller
Buildings.Fluid.Sensors.TemperatureTwoPortTCWLeaTow (from DataCenter)Temperature of condenser water leaving the cooling tower
Modelica.Blocks.Sources.ConstantcooTowFanCon (from DataCenter)Control signal for cooling tower fan
Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentagevalByp (from DataCenter)Bypass valve for chiller.
Buildings.Examples.ChillerPlant.DataCenter.BaseClasses.Controls.KMinusUKMinusU (from DataCenter)
Buildings.Fluid.Actuators.Valves.TwoWayLinearval3 (from DataCenter)Control valve for economizer. 0: disable economizer, 1: enable economizer
Buildings.Fluid.Sensors.TemperatureTwoPortTCHWLeaCoi (from DataCenter)Temperature of chilled water leaving the cooling coil
Buildings.BoundaryConditions.WeatherData.ReaderTMY3weaData (from DataCenter)
Modelica.Blocks.Math.Gaingain (from DataCenter)
Modelica.Blocks.Math.Feedbackfeedback (from DataCenter)
Modelica.Blocks.Logical.GreaterThresholdgreaterThreshold (from DataCenter)
Modelica.Blocks.Logical.Oror1 (from DataCenter)
Modelica.Blocks.Math.BooleanToRealmCWFlo (from DataCenter)Mass flow rate of condenser loop
Modelica.Blocks.Sources.RealExpressionPHVAC (from DataCenter)Power consumed by HVAC system
Modelica.Blocks.Sources.RealExpressionPIT (from DataCenter)Power consumed by IT
Modelica.Blocks.Continuous.IntegratorEHVAC (from DataCenter)Energy consumed by HVAC
Modelica.Blocks.Continuous.IntegratorEIT (from DataCenter)Energy consumed by IT
BaseClasses.Controls.TrimAndRespondContinuousTimeApproximationtriAndResContinuous time approximation for trim and respond controller

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