modelFixedApproachDryBulb

Test model for cooling tower with fixed approach temperature using the dry-bulb temperature
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Extends from Modelica.Icons.Example (Icon for runnable examples), BaseClasses.PartialStaticTwoPortCoolingTower (Base class for test models of cooling towers).

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.

Parameters

TypeNameDefaultDescription
Nominal condition
Modelica.Units.SI.MassFlowRatem_flow_nominal (from PartialStaticTwoPortCoolingTower)0.5Design water flow rate

Connectors

TypeNameDefaultDescription
Buildings.BoundaryConditions.WeatherData.BusweaBus (from PartialStaticTwoPortCoolingTower)Weather data bus

Components

TypeNameDefaultDescription
Buildings.Fluid.HeatExchangers.CoolingTowers.BaseClasses.CoolingTowertow (from PartialStaticTwoPortCoolingTower)
Buildings.Fluid.Movers.FlowControlled_m_flowpum (from PartialStaticTwoPortCoolingTower)Pump for condenser water loop
Buildings.BoundaryConditions.WeatherData.ReaderTMY3weaDat (from PartialStaticTwoPortCoolingTower)
Modelica.Blocks.Logical.OnOffControlleronOffCon (from PartialStaticTwoPortCoolingTower)On/off controller
Modelica.Blocks.Logical.Switchswi (from PartialStaticTwoPortCoolingTower)Control switch for chilled water pump
Modelica.Blocks.Sources.ConstantTSwi (from PartialStaticTwoPortCoolingTower)Switch temperature for switching tower pump on
Modelica.Blocks.Sources.Constantzer (from PartialStaticTwoPortCoolingTower)Zero flow rate
Modelica.Blocks.Sources.Constantm_flow (from PartialStaticTwoPortCoolingTower)Water flow rate
Buildings.Fluid.MixingVolumes.MixingVolumevol (from PartialStaticTwoPortCoolingTower)
Buildings.Fluid.Sources.Boundary_pTexp (from PartialStaticTwoPortCoolingTower)Expansion vessel
Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlowfixHeaFlo (from PartialStaticTwoPortCoolingTower)Fixed heat flow rate
Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensorTVol (from PartialStaticTwoPortCoolingTower)Water temperature
Buildings.Fluid.Sensors.TemperatureTwoPortTEnt (from PartialStaticTwoPortCoolingTower)Water entering temperature

Revisions

  • April 27, 2026, by Michael Wetter:
    Refactored for new cooling tower implementation.
    This is for issue 4567.
  • July 12, 2011, by Michael Wetter:
    First implementation.