|Système de distribution|
A distribution system is a network designed to receive, store, maintain, distribute, or control the flow of a distribution media. A common example is a heating hot water system that consists of a pump, a tank, and an interconnected piping system for distributing hot water to terminals.
The group IfcDistributionSystem
defines the occurrence of a specialized system for use within the context of building services.
Important functionalities for the description of a distribution system are derived from existing IFC entities:
- From IfcObject it inherits the inverse attribute IsDecomposedBy pointing to the relationship entity IfcRelAggregates. It provides the hierarchy between the separate (partial) distribution systems. For example, an electrical main circuit may be aggregated into branch circuits.
HISTORY New entity in IFC4.
IFC4 CHANGE For electrical power systems, IfcElectricalCircuit has been used for low-voltage (12-1000 V) power circuits and has been replaced by IfcDistributionCircuit in IFC4; IfcDistributionSystem with PredefinedType 'ELECTRICAL' should be used for overall power systems, and IfcDistributionCircuit with PredefinedType 'ELECTRICAL' should be used for each switched circuit.
Common Use Definitions
The following concepts are inherited at supertypes:
Property Sets for Objects
The Property Sets for Objects concept applies to this entity as shown in Table 221.
Table 221 — IfcDistributionSystem Property Sets for Objects
The Object Aggregation concept applies to this entity as shown in Table 222.
Table 222 — IfcDistributionSystem Object Aggregation
The Group Assignment concept applies to this entity as shown in Table 223.
|IfcDistributionElement||Indicates devices that are part of the system, where any ports of the same PredefinedType are considered part of the system implicitly.|
|IfcDistributionPort||Indicates port that is explicitly part of the system, which overrides any system assignment of the containing device.|
Table 223 — IfcDistributionSystem Group Assignment
For the most common case of an IfcDistributionElement subtype containing ports of a particular PredefinedType that all belong to the same distribution system, the IfcDistributionElement is assigned to the IfcDistributionSystem via the IfcRelAssignsToGroup relationship, where IfcDistributionPort's are implied as part of the corresponding system based on their PredefinedType. An IfcDistributionElement may belong to multiple systems, however only one IfcDistributionSystem of a particular PredefinedType.
For rare cases where an IfcDistributionElement subtype contains ports of the same PredefinedType yet different ports belong to different systems, alternatively each IfcDistributionPort may be directly assigned to a single IfcDistributionSystem via the IfcRelAssignsToGroup relationship, where the PredefinedType must match. Such assignment indicates that the IfcDistributionSystem assigned from the IfcDistributionPort overrides any such system of the same PredefinedType assigned from the containing IfcDistributionElement, if any.
Additionally, an IfcDistributionSystem may in turn be assigned to an IfcDistributionPort indicating the host or origination of the system using IfcRelAssignsToProduct.
EXAMPLE A gas-powered hot water heater may have three ports: GAS, DOMESTICCOLDWATER, and DOMESTICHOTWATER. The heater is a member of two systems (GAS and DOMESTICCOLDWATER), and hosts one system (DOMESTICHOTWATER) at the corresponding port.
Figure 237 illustrates a distribution system for an electrical circuit.
Figure 237 — Distribution system assignment
XSD Specification: <xs:element name="IfcDistributionSystem" type="ifc:IfcDistributionSystem" substitutionGroup="ifc:IfcSystem" nillable="true"/>
<xs:attribute name="LongName" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="PredefinedType" type="ifc:IfcDistributionSystemEnum" use="optional"/>
|LongName|| : ||
Long name for a system, used for informal purposes. It should be used, if available, in conjunction with the inherited Name attribute.
NOTE In many scenarios the Name attribute refers to the short name or number of a distribution system or branch circuit, and the LongName refers to a descriptive name.
|PredefinedType|| : ||Predefined types of distribution systems.|
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