Buildings.Fluid.HeatExchangers.CoolingTowers.Examples

Collection of models that illustrate model use and test models

Information

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

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

Package Content

Name	Description
FixedApproachDryBulb	Test model for cooling tower with fixed approach temperature using the dry-bulb temperature
FixedApproachWetBulb	Test model for cooling tower with fixed approach temperature using the wet-bulb temperature
Merkel	Test model for cooling tower using the Merkel theory
YorkCalc	Test model for cooling tower using the York performance correlation
BaseClasses	Package with base classes for Buildings.Fluid.HeatExchangers.CoolingTowers.Examples

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.FixedApproachDryBulb

Test model for cooling tower with fixed approach temperature using the dry-bulb temperature

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.FixedApproachDryBulb

Information

This example illustrates the use of the cooling tower model Buildings.Fluid.HeatExchangers.CoolingTowers.FixedApproach, using the outdoor dry-bulb temperature as the potential for heat transfer. Heat is injected into the volume vol. An on/off controller switches the cooling loop water pump on or off based on the temperature of this volume. The cooling tower outlet temperature has a fixed approach temperature to the outdoor dry-bulb temperature.

Extends from Modelica.Icons.Example (Icon for runnable examples), BaseClasses.PartialStaticTwoPortCoolingTower (Base class for test models of cooling towers).

Parameters

Type	Name	Default	Description
Nominal condition
MassFlowRate	m_flow_nominal	0.5	Design water flow rate [kg/s]

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model FixedApproachDryBulb "Test model for cooling tower with fixed approach temperature using the dry-bulb temperature" extends Modelica.Icons.Example; extends BaseClasses.PartialStaticTwoPortCoolingTower( redeclare CoolingTowers.FixedApproach tow( m_flow_nominal=m_flow_nominal), vol(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial)); equation connect(weaBus.TDryBul, tow.TAir); end FixedApproachDryBulb;

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.FixedApproachWetBulb

Test model for cooling tower with fixed approach temperature using the wet-bulb temperature

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.FixedApproachWetBulb

Information

This example illustrates the use of the cooling tower model Buildings.Fluid.HeatExchangers.CoolingTowers.FixedApproach, using the outdoor wet-bulb temperature as the potential for heat transfer. Heat is injected into the volume vol. An on/off controller switches the cooling loop water pump on or off based on the temperature of this volume. The cooling tower outlet temperature has a fixed approach temperature to the outdoor wet-bulb temperature.

Extends from Modelica.Icons.Example (Icon for runnable examples), BaseClasses.PartialStaticTwoPortCoolingTower (Base class for test models of cooling towers).

Parameters

Type	Name	Default	Description
Nominal condition
MassFlowRate	m_flow_nominal	0.5	Design water flow rate [kg/s]

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model FixedApproachWetBulb "Test model for cooling tower with fixed approach temperature using the wet-bulb temperature" extends Modelica.Icons.Example; extends BaseClasses.PartialStaticTwoPortCoolingTower( redeclare CoolingTowers.FixedApproach tow( m_flow_nominal=m_flow_nominal), weaDat( final computeWetBulbTemperature=true)); equation connect(weaBus.TWetBul, tow.TAir); end FixedApproachWetBulb;

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.Merkel

Test model for cooling tower using the Merkel theory

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.Merkel

Information

This example illustrates the use of the cooling tower model Buildings.Fluid.HeatExchangers.CoolingTowers.Merkel. Heat is injected into the volume vol. An on/off controller switches the cooling loop water pump on or off based on the temperature of this volume. The cooling tower outlet temperature is controlled to track a fixed temperature.

Extends from Modelica.Icons.Example (Icon for runnable examples), BaseClasses.PartialStaticTwoPortCoolingTower (Base class for test models of cooling towers).

Parameters

Type	Name	Default	Description
Nominal condition
MassFlowRate	m_flow_nominal	0.5	Design water flow rate [kg/s]
Real	ratWatAir_nominal	0.625	Design water-to-air ratio

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model Merkel "Test model for cooling tower using the Merkel theory" extends Modelica.Icons.Example; extends BaseClasses.PartialStaticTwoPortCoolingTower( redeclare Buildings.Fluid.HeatExchangers.CoolingTowers.Merkel tow( ratWatAir_nominal=ratWatAir_nominal, TAirInWB_nominal=273.15 + 25.55, TWatIn_nominal=273.15 + 35, TWatOut_nominal=273.15 + 35 - 5.56, PFan_nominal=4800), weaDat(final computeWetBulbTemperature=true)); parameter Real ratWatAir_nominal = 0.625 "Design water-to-air ratio"; Modelica.Blocks.Sources.Constant TSetLea(k=273.15 + 18) "Setpoint for leaving temperature"; Buildings.Controls.OBC.CDL.Reals.PID conFan( k=1, Ti=60, Td=10, reverseActing=false, u_s(unit="K", displayUnit="degC"), u_m(unit="K", displayUnit="degC")) "Controller for tower fan"; equation connect(TSetLea.y, conFan.u_s); connect(conFan.y, tow.y); connect(tow.TLvg, conFan.u_m); connect(weaBus.TWetBul, tow.TAir); end Merkel;

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc

Test model for cooling tower using the York performance correlation

Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc

Information

This example illustrates the use of the cooling tower model Buildings.Fluid.HeatExchangers.CoolingTowers.YorkCalc. Heat is injected into the volume vol. An on/off controller switches the cooling loop water pump on or off based on the temperature of this volume. The cooling tower outlet temperature is controlled to track a fixed temperature.

Extends from Modelica.Icons.Example (Icon for runnable examples), BaseClasses.PartialStaticTwoPortCoolingTower (Base class for test models of cooling towers).

Parameters

Type	Name	Default	Description
Nominal condition
MassFlowRate	m_flow_nominal	0.5	Design water flow rate [kg/s]

Connectors

Type	Name	Description
Bus	weaBus	Weather data bus

Modelica definition

model YorkCalc "Test model for cooling tower using the York performance correlation" extends Modelica.Icons.Example; extends BaseClasses.PartialStaticTwoPortCoolingTower( redeclare CoolingTowers.YorkCalc tow, weaDat( final computeWetBulbTemperature=true)); Modelica.Blocks.Sources.Constant TSetLea(k=273.15 + 18) "Setpoint for leaving temperature"; Controls.Continuous.LimPID conFan( k=1, Ti=60, Td=10, reverseActing=false, initType=Modelica.Blocks.Types.Init.InitialState) "Controller for tower fan"; equation connect(TSetLea.y, conFan.u_s); connect(conFan.y, tow.y); connect(tow.TLvg, conFan.u_m); connect(weaBus.TWetBul, tow.TAir); end YorkCalc;