Defined in File Ifc4.h
IfcDamper: public Ifc4::IfcFlowController¶
A damper typically participates in an HVAC duct distribution system and is used to control or modulate the flow of air.
HISTORY New entity in IFC2x4
Type Use Definition IfcDamper defines the occurrence of any damper; common information about damper types is handled by IfcDamperType. The IfcDamperType (if present) may establish the common type name, usage (predefined type), properties, materials, ports, composition, assignments, and representations. The IfcDamperType is attached using the IfcRelDefinesByType objectified relationship and is accessible by the IsTypedBy inverse attribute. If the IfcDamperType has ports or aggregated elements, such objects are reflected at the IfcDamper occurrence using the IfcRelDefinesByObject relationship.
Property Use Definition The property sets relating to this entity are defined by IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. Property sets may also be specified at the IfcDamperType, defining the common property data for all occurrences of the same type. They are then accessible by the IsTypedBy inverse attribute pointing to IfcDamperType.HasPropertySets. If both are given, then the properties directly defined at IfcDamper override the properties defined at IfcDamperType. Refer to the documentation at the supertype IfcFlowController and ancestors for inherited property set definitions. The following property set definitions are applicable to this entity: (All Types)
Pset_DamperOccurrence (PSET_OCCURRENCEDRIVEN) Pset_DamperPHistory (PSET_PERFORMANCEDRIVEN) Pset_DamperTypeCommon (PSET_TYPEDRIVENOVERRIDE)
Quantity Use Definition The quantities relating to this entity are defined by IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. The following base quantities are defined and shall be exchanged with the IfcElementQuantity.Name = ‘BaseQuantities’. Other quantities, being subjected to local standard of measurement, may be defined with another string value assigned to Name. In this case a valid value for MethodOfMeasurement shall be provided.
Material Use Definition The material of the IfcDamper is defined by IfcMaterialConstituentSet or as a fallback by IfcMaterial, and attached by the RelatingMaterial attribute on the IfcRelAssociatesMaterial relationship. It is accessible by the HasAssociations inverse attribute. Material information can also be given at the IfcDamperType, defining the common attribute data for all occurrences of the same type. The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:
Blade: The material from which the damper blades are constructed. Frame: The material from which the damper frame is constructed. Seal: The material from which the damper seals are constructed.
Connection Use Definition The IfcDamper may be connected to other objects as follows using the indicated relationship:
Port Use Definition The distribution ports relating to the IfcDamper are defined by IfcDistributionPort and attached by the IfcRelConnectsPortToElement relationship. If the damper occurrence is defined by IfcDamperType, then the port occurrences must reflect those defined at the IfcDamperType using the IfcRelDefinesByObject relationship. Ports are specific to the IfcDamper PredefinedType as follows indicated by the IfcDistributionPort Name, PredefinedType, and FlowDirection:
AirIn (AIRCONDITIONING, SINK): Air entering damper. AirOut (AIRCONDITIONING, SOURCE): Air leaving damper, with flow regulated according to position of damper.
Figure 220 illustrates damper port use. Figure 220 — Damper port use
Whether the optional attribute PredefinedType is defined for this IfcDamper.
IfcDamper(std::string v1_GlobalId, ::Ifc4::IfcOwnerHistory *v2_OwnerHistory, boost::optional<std::string> v3_Name, boost::optional<std::string> v4_Description, boost::optional<std::string> v5_ObjectType, ::Ifc4::IfcObjectPlacement *v6_ObjectPlacement, ::Ifc4::IfcProductRepresentation *v7_Representation, boost::optional<std::string> v8_Tag, boost::optional<::Ifc4::IfcDamperTypeEnum::Value> v9_PredefinedType)¶