IFC 4.3.0.1 (IFC4X3) development

7.5.4.28 Pset_CoolingTowerTypeCommon

7.5.4.28.1 Semantic definition

Cooling tower type common attributes. WaterRequirement attribute unit type modified in IFC2x2 Pset Addendum.

7.5.4.28.2 Applicable entities

7.5.4.28.3 Properties

Name Property Type Data Type Description
Reference IfcPropertySingleValue IfcIdentifier

Reference ID for this specified type in this project (e.g. type 'A-1'), Also referred to as "construction type". It should be provided as an alternative to the name of the "object type", if the software does not support object types and no classification reference to a recognized classification system used.

Status IfcPropertyEnumeratedValue PEnum_ElementStatus

Status of the element, predominately used in renovation or retrofitting projects. The status can be assigned to as "New" - element designed as new addition, "Existing" - element exists and remains, "Demolish" - element existed but is to be demolished, "Temporary" - element will exists only temporary (like a temporary support structure).

NominalCapacity IfcPropertySingleValue IfcPowerMeasure

The total nominal or volumetric capacity of the object.

Nominal cooling tower capacity in terms of heat transfer rate of the cooling tower between air stream and water stream at nominal conditions.

CircuitType IfcPropertyEnumeratedValue PEnum_CoolingTowerCircuitType

OpenCircuit: Exposes water directly to the cooling atmosphere. CloseCircuit: The fluid is separated from the atmosphere by a heat exchanger. Wet: The air stream or the heat exchange surface is evaporatively cooled. Dry: No evaporation into the air stream. DryWet: A combination of a dry tower and a wet tower.

FlowArrangement IfcPropertyEnumeratedValue PEnum_CoolingTowerFlowArrangement

Defines the basic flow arrangements for the heat exchanger or cooler tower:

COUNTERFLOW: Air and water flow enter in different directions. CROSSFLOW: Air and water flow are perpendicular. PARALLELFLOW: Air and water flow enter in same directions. MULTIPASS: Multipass flow heat exchanger arrangement. OTHER: Other type of heat exchanger flow arrangement not defined above.

SprayType IfcPropertyEnumeratedValue PEnum_CoolingTowerSprayType

SprayFilled: Water is sprayed into airflow. SplashTypeFill: water cascades over successive rows of splash bars. FilmTypeFill: water flows in a thin layer over closely spaced sheets.

CapacityControl IfcPropertyEnumeratedValue PEnum_CoolingTowerCapacityControl

FanCycling: Fan is cycled on and off to control duty. TwoSpeedFan: Fan is switched between low and high speed to control duty. VariableSpeedFan: Fan speed is varied to control duty. DampersControl: Dampers modulate the air flow to control duty. BypassValveControl: Bypass valve modulates the water flow to control duty. MultipleSeriesPumps: Turn on/off multiple series pump to control duty. TwoSpeedPump: Switch between high/low pump speed to control duty. VariableSpeedPump: vary pump speed to control duty.

ControlStrategy IfcPropertyEnumeratedValue PEnum_CoolingTowerControlStrategy

FixedExitingWaterTemp: The capacity is controlled to maintain a fixed exiting water temperature. WetBulbTempReset: The set-point is reset based on the wet-bulb temperature.

NumberOfCells IfcPropertySingleValue IfcCountMeasure

Number of cells in one cooling tower unit.

BasinReserveVolume IfcPropertySingleValue IfcVolumeMeasure

Volume between operating and overflow levels in cooling tower basin.

LiftElevationDifference IfcPropertySingleValue IfcPositiveLengthMeasure

Elevation difference between cooling tower sump and the top of the tower.

WaterRequirement IfcPropertySingleValue IfcVolumetricFlowRateMeasure

Make-up water requirement.

OperationTemperatureRange IfcPropertySingleValue IfcThermodynamicTemperatureMeasure

Allowable operation ambient air temperature range.

AmbientDesignDryBulbTemperature IfcPropertySingleValue IfcThermodynamicTemperatureMeasure

Ambient design dry bulb temperature used for selecting the cooling tower.

AmbientDesignWetBulbTemperature IfcPropertySingleValue IfcThermodynamicTemperatureMeasure

Ambient design wet bulb temperature used for selecting the cooling tower.

Table 7.5.4.28.A

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7.5.4.28.4 Changelog