IFC (IFC4X3_ADD2) under development Pset_DuctSegmentPHistory Semantic definition

Duct segment performance history common attributes. Applicable entities Properties

Name Property Type Data Type Description
LossCoefficient IfcPropertyReferenceValue IfcTimeSeries

Dimensionless loss coefficient used for calculating fluid resistance representing the ratio of total pressure loss to velocity pressure at a referenced cross-section.

AtmosphericPressure IfcPropertyReferenceValue IfcTimeSeries

Ambient atmospheric pressure.

LeakageCurveHistory IfcPropertyReferenceValue IfcTimeSeries

Leakage per unit length curve versus working pressure. If a scalar is expressed then it represents LeakageClass which is flowrate per unit area at a specified pressure rating (e.g., ASHRAE Fundamentals 2001 34.16.).

FluidFlowLeakage IfcPropertyReferenceValue IfcTimeSeries

Volumetric leakage flow rate.


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  • property, LeakageCurveHistory
  • property, LeakageCurve