Buildings.Applications.DataCenters.LiquidCooled.Validation

Collection of validation models

Information

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

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
ChillerWSEDesignConditionsGlycol	Validation model that tests the component configurations at design conditions
ChillerWSEDesignConditionsWater	Validation model that tests the component configurations at design conditions, using water in all fluid loops

Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsGlycol

Validation model that tests the component configurations at design conditions

Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsGlycol

Information

Validation model that simulates Buildings.Applications.DataCenters.LiquidCooled.Examples.ChillerWSE at design conditions.

This model verifies the design conditions if the system is designed for full economizer use, and the IT utilization is 100%.

Extends from Buildings.Applications.DataCenters.LiquidCooled.Examples.ChillerWSE (Example model of a simple liquid-cooled data center with chiller and water-side economizer).

Parameters

Type	Name	Default	Description
replaceable package MediumTow		Buildings.Media.Antifreeze.P...	Medium for tower loop
replaceable package MediumRac		Buildings.Media.Antifreeze.P...	Medium for rack
Power	PRac	1E6	Total rack design power [W]
Real	fraWSE	0.999999	Fraction of peak load covered by water side economizer
Real	fraChi	1 - fraWSE	Fraction of peak load covered by chiller
MassFlowRate	mRac_flow_nominal	PRac/(TRacRet_nominal - TRac...	Rack mass flow rate at design conditions [kg/s]
MassFlowRate	mPla_flow_nominal	PRac/(TPlaRet_nominal - TPla...	Cooling loop water mass flow rate at design conditions [kg/s]
PressureDifference	dpVal_nominal	20000	Valve design pressure drop [Pa]
PressureDifference	dpHexChi_nominal	80000	Heat exchanger design pressure drop on chiller side [Pa]
PressureDifference	dPRac_nominal	60000	Rack design pressure drop [Pa]
OCP_1kW_OAM_PG25	datRac		Performance data for IT rack
Real	COPc_nominal	5	Chiller COP
Real	epsWSE_nominal	QWSE_flow_nominal/(min(mWSEP...	Effectiveness of water side economizer
Generic_2MW	datCDU		Data record for CDU
Generic	datCooTow		Performance data for cooling tower
replaceable model Pipe		HydraulicDiameter	Pipe model

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model ChillerWSEDesignConditionsGlycol "Validation model that tests the component configurations at design conditions" extends Buildings.Applications.DataCenters.LiquidCooled.Examples.ChillerWSE( break weaDat, break weaBus, uti(k=1), fraWSE=0.999999, yPumChi(realTrue=0), cdu( addPowerToMedium=false) ); Buildings.Controls.OBC.CDL.Reals.Sources.Constant TDryBulCon( y(final unit="K", displayUnit="degC"), k(final unit="K", displayUnit="degC") = datCooTow.TAirIn_nominal) "Design dry bulb temperature"; equation connect(TDryBulCon.y, cooTow.TDryBul); end ChillerWSEDesignConditionsGlycol;

Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsWater

Validation model that tests the component configurations at design conditions, using water in all fluid loops

Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsWater

Information

Validation model that simulates Buildings.Applications.DataCenters.LiquidCooled.Examples.ChillerWSE at design conditions. The model is identical to Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsGlycol except that the media is set to water.

This model verifies that the media conversions are implemented correctly.

Extends from Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsGlycol (Validation model that tests the component configurations at design conditions).

Parameters

Type	Name	Default	Description
replaceable package MediumTow		Buildings.Media.Water	Medium for tower loop
replaceable package MediumRac		Buildings.Media.Water	Medium for rack
Power	PRac	1E6	Total rack design power [W]
Real	fraWSE	0.999999	Fraction of peak load covered by water side economizer
Real	fraChi	1 - fraWSE	Fraction of peak load covered by chiller
MassFlowRate	mRac_flow_nominal	PRac/(TRacRet_nominal - TRac...	Rack mass flow rate at design conditions [kg/s]
MassFlowRate	mPla_flow_nominal	PRac/(TPlaRet_nominal - TPla...	Cooling loop water mass flow rate at design conditions [kg/s]
PressureDifference	dpVal_nominal	20000	Valve design pressure drop [Pa]
PressureDifference	dpHexChi_nominal	80000	Heat exchanger design pressure drop on chiller side [Pa]
PressureDifference	dPRac_nominal	60000	Rack design pressure drop [Pa]
OCP_1kW_OAM_PG25	datRac		Performance data for IT rack
Real	COPc_nominal	5	Chiller COP
Real	epsWSE_nominal	QWSE_flow_nominal/(min(mWSEP...	Effectiveness of water side economizer
Generic	datCooTow		Performance data for cooling tower
replaceable model Pipe		HydraulicDiameter	Pipe model

Connectors

Type	Name	Description
replaceable package MediumTow		Medium for tower loop
replaceable package MediumRac		Medium for rack
Bus	weaBus	Weather data bus

Modelica definition

model ChillerWSEDesignConditionsWater "Validation model that tests the component configurations at design conditions, using water in all fluid loops" extends Buildings.Applications.DataCenters.LiquidCooled.Validation.ChillerWSEDesignConditionsGlycol( redeclare package MediumTow = Buildings.Media.Water, redeclare package MediumRac = Buildings.Media.Water, datCDU( medRac=Buildings.Fluid.DataCenters.CDUs.Types.Media.Water, phiGlyRac=0) ); end ChillerWSEDesignConditionsWater;