Buildings.Fluid.Chillers.Examples

This package contains examples for the use of models that can be found in Buildings.Fluid.Chillers.

Package Content

Name	Description
Carnot	Test model for chiller based on Carnot efficiency
ElectricEIR	Test model for chiller electric EIR
ElectricReformulatedEIR	Test model for chiller electric reformulated EIR
BaseClasses	Package with base classes for Buildings.Fluid.Chillers.Examples

Buildings.Fluid.Chillers.Examples.Carnot

Information

Example that simulates a chiller whose efficiency is scaled based on the Carnot cycle.

Parameters

Modelica definition

Type	Name	Default	Description
Power	P_nominal	10E3	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	m2_flow_nominal	P_nominal*COPc_nominal/dTEva...	Nominal mass flow rate at chilled water side [kg/s]
MassFlowRate	m1_flow_nominal	m2_flow_nominal*(COPc_nomina...	Nominal mass flow rate at condenser water wide [kg/s]

model Carnot "Test model for chiller based on Carnot efficiency" extends Modelica.Icons.Example; package Medium1 = Buildings.Media.Water "Medium model"; package Medium2 = Buildings.Media.Water "Medium model"; parameter Modelica.SIunits.Power P_nominal=10E3 "Nominal compressor power (at y=1)"; parameter Modelica.SIunits.TemperatureDifference dTEva_nominal=10 "Temperature difference evaporator inlet-outlet"; parameter Modelica.SIunits.TemperatureDifference dTCon_nominal=10 "Temperature difference condenser outlet-inlet"; parameter Real COPc_nominal = 3 "Chiller COP"; parameter Modelica.SIunits.MassFlowRate m2_flow_nominal= P_nominal*COPc_nominal/dTEva_nominal/4200 "Nominal mass flow rate at chilled water side"; parameter Modelica.SIunits.MassFlowRate m1_flow_nominal= m2_flow_nominal*(COPc_nominal+1)/COPc_nominal "Nominal mass flow rate at condenser water wide"; Buildings.Fluid.Chillers.Carnot chi( redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, P_nominal=P_nominal, dTEva_nominal=dTEva_nominal, dTCon_nominal=dTCon_nominal, use_eta_Carnot=true, etaCar=0.3, dp1_nominal=6000, dp2_nominal=6000, m1_flow_nominal=m1_flow_nominal, m2_flow_nominal=m2_flow_nominal, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, show_T=true) "Chiller model"; Buildings.Fluid.Sources.MassFlowSource_T sou1(nPorts=1, redeclare package Medium = Medium1, use_T_in=true, m_flow=m1_flow_nominal, T=298.15); Buildings.Fluid.Sources.MassFlowSource_T sou2(nPorts=1, redeclare package Medium = Medium2, use_T_in=true, m_flow=m2_flow_nominal, T=291.15); Buildings.Fluid.Sources.FixedBoundary sin1(nPorts=1, redeclare package Medium = Medium1); Buildings.Fluid.Sources.FixedBoundary sin2(nPorts=1, redeclare package Medium = Medium2); Modelica.Blocks.Sources.Ramp uCom( height=-1, duration=60, offset=1, startTime=1800) "Compressor control signal"; Modelica.Blocks.Sources.Ramp TCon_in( height=10, duration=60, offset=273.15 + 20, startTime=60) "Condenser inlet temperature"; Modelica.Blocks.Sources.Ramp TEva_in( height=10, duration=60, startTime=900, offset=273.15 + 15) "Evaporator inlet temperature"; equation connect(sou1.ports[1], chi.port_a1); connect(sou2.ports[1], chi.port_a2); connect(chi.port_b1, sin1.ports[1]); connect(sin2.ports[1], chi.port_b2); connect(TCon_in.y, sou1.T_in); connect(TEva_in.y, sou2.T_in); connect(uCom.y, chi.y); end Carnot;

Buildings.Fluid.Chillers.Examples.ElectricEIR

Information

Example that simulates a chiller whose efficiency is computed based on the condenser entering and evaporator leaving fluid temperature. A bicubic polynomial is used to compute the chiller part load performance.

Parameters

Modelica definition

Type	Name	Default	Description
Power	P_nominal	-per.QEva_flow_nominal/per.C...	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	per.mEva_flow_nominal	Nominal mass flow rate at evaporator [kg/s]
MassFlowRate	mCon_flow_nominal	per.mCon_flow_nominal	Nominal mass flow rate at condenser [kg/s]
ElectricEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes	per		Chiller performance data

model ElectricEIR "Test model for chiller electric EIR" extends Modelica.Icons.Example; extends Buildings.Fluid.Chillers.Examples.BaseClasses.PartialElectric( P_nominal=-per.QEva_flow_nominal/per.COP_nominal, mEva_flow_nominal=per.mEva_flow_nominal, mCon_flow_nominal=per.mCon_flow_nominal, sou1(nPorts=1), sou2(nPorts=1)); parameter Data.ElectricEIR.ElectricEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes per "Chiller performance data"; Buildings.Fluid.Chillers.ElectricEIR chi( redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, per=per, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, dp1_nominal=6000, dp2_nominal=6000) "Chiller model"; equation connect(sou1.ports[1], chi.port_a1); connect(chi.port_b1, res1.port_a); connect(sou2.ports[1], chi.port_a2); connect(chi.port_b2, res2.port_a); connect(chi.on, greaterThreshold.y); connect(chi.TSet, TSet.y); end ElectricEIR;

Buildings.Fluid.Chillers.Examples.ElectricReformulatedEIR

Information

Example that simulates a chiller whose efficiency is computed based on the condenser leaving and evaporator leaving fluid temperature. A bicubic polynomial is used to compute the chiller part load performance.

Parameters

Modelica definition

Type	Name	Default	Description
Power	P_nominal	-per.QEva_flow_nominal/per.C...	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	per.mEva_flow_nominal	Nominal mass flow rate at evaporator [kg/s]
MassFlowRate	mCon_flow_nominal	per.mCon_flow_nominal	Nominal mass flow rate at condenser [kg/s]
ReformEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes	per		Chiller performance data

model ElectricReformulatedEIR "Test model for chiller electric reformulated EIR" extends Modelica.Icons.Example; extends Buildings.Fluid.Chillers.Examples.BaseClasses.PartialElectric( P_nominal=-per.QEva_flow_nominal/per.COP_nominal, mEva_flow_nominal=per.mEva_flow_nominal, mCon_flow_nominal=per.mCon_flow_nominal, sou1(nPorts=1), sou2(nPorts=1)); parameter Data.ElectricReformulatedEIR.ReformEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes per "Chiller performance data"; Buildings.Fluid.Chillers.ElectricReformulatedEIR chi( redeclare package Medium1 = Medium1, redeclare package Medium2 = Medium2, per=per, energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial, dp1_nominal=6000, dp2_nominal=6000) "Chiller model"; equation connect(sou1.ports[1], chi.port_a1); connect(chi.port_b1, res1.port_a); connect(sou2.ports[1], chi.port_a2); connect(chi.port_b2, res2.port_a); connect(chi.on, greaterThreshold.y); connect(TSet.y, chi.TSet); end ElectricReformulatedEIR;