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  Specification for IfcSharedBldgServiceElements  

EXPRESS Definition

EXPRESS-G Diagram

IDL Definition

Schema Semantic Definition

The IfcSharedBldgServiceElements schema in the interoperability layer defines basic object concepts required for interoperability between Building Service domain extensions (notably HVAC) and other domain extensions defined in the current IFC model. This schema includes Equipment, Fixture, and Electrical Appliance.

Type IfcElectricalApplianceTypeEnum

EXPRESS Definition

Type Semantic Definition

Definition from IFC: This enumeration defines the different types of Electrical Appliances an IfcElectricalAppliance object can fulfill.

Enumeration:

Computer	Computer Electrical Appliance Type
Copier	Copier Electrical Appliance Type
Fax	Facsimile Electrical Appliance Type
Printer	Printer Electrical Appliance Type
Telephone	Telephone Electrical Appliance Type

Type IfcEquipmentTypeEnum

EXPRESS Definition

Type Semantic Definition

Definition from IFC: This enumeration defines the different types of Equipment an IfcEquipment object can fulfill.

Enumeration:

AirFilter	Apparatus used to remove particulate or gaseous matter from air. This property set is typically used in conjunction with another piece of equipment, such as an AirHandler or PackagedACUnit
AirHandler	Equipment which modifies the psychrometric properties of a controlled air stream. It typically consists of an arrangement of Fans, Coils and AirFilters
Boiler	Equipment which converts stored energy to heat which is added to a fluid; typically used to heat water.
Chiller	Equipment used to implement a refrigeration cycle for cooling a fluid
Coil	Equipment used to provide heat transfer between non-mixing media. This is typically used in conjunction with an AirHandler or PackagedACUnit and uses a TubeBundle
Compressor	Equipment that compresses a fluid typically used in a refrigeration circuit
Convector	Equipment which adds heat to a space utilizing natural convection
CoolingTower	Equipment which rejects heat to ambient air.
Fan	Equipment which imparts mechanical work on a gas
HeatExchanger	Equipment used to provide heat transfer between non-mixing media such as both plate and shell and tube heat exchangers
Motor	Equipment used to convert electrical power to rotational mechanical power
PackagedACUnit	Equipment which utilizes an integral refrigeration cycle for cooling a fluid (typically air)
Pump	Equipment which imparts mechanical work on a liquid
TubeBundle	Tube and bundles of tubes properties used within equipment
UnitHeater	Equipment which adds heat to a space

Type IfcFixtureTypeEnum

EXPRESS Definition

Type Semantic Definition

Definition from IFC: This enumeration defines the different types of Fixtures an IfcFixture object can fulfill.

Enumeration:

Electrical
Plumbing

Type IfcDiscreteElementTypeEnum

EXPRESS Definition

Type Semantic Definition

Definition from IFC: This enumeration defines the different types of discrete elements an IfcDiscreteElement object can fulfill.

Enumeration:

Insulation

Materials with low heat conductance

Type IfcDistributionElementTypeEnum

EXPRESS Definition

Type Semantic Definition

Definition from IFC: This enumeration defines the different types of distribution elements an IfcDistributionElement object can fulfill. Note that this enumeration is empty for this release of the IFC model. It is provided as a placeholder for model enhancements to be introduced in the next IFC release.

Enumeration:

NotYetDefined

Class IfcElectricalAppliance

EXPRESS Definition

Class Semantic Definition

This class defines common electrical appliances found in a typical AEC/FM project.

Attribute and Relationship Definitions

Inherited Classes

Attributes and Relationships

	Attribute / Relation	Definition	Data or Relation Type	Min	Max	Default
	GenericType	Predefined generic types are specified in an Enumeration. A TypeDefinition is available for each generic type (as the required attributes differ). Use Type Definition corresponding to this generic type.	IfcElectricalApplianceTypeEnum	Computer	Telephone	Telephone

Formal Propositions:

None

Interface Definitions

• I_ElectricalAppliance

Runtime Type Definitions

Geometry Use Definitions

The geometric representation of IfcElectricalAppliance is given by the IfcProductShape, allowing multiple geometric representations. Included are:

Local Position

The local for IfcElectricalAppliance is defined in its supertype, IfcProduct. It is defined by the

• IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

The standard geometric representation of IfcElectricalAppliance is defined using explicit geometry. The faceted B-Rep capabilities (with or without voids) shall be supported for standard representation.

Currently, the usage of attribute driven geometry for IfcElectricalAppliance is not supported.

Class IfcEquipment

EXPRESS Definition

Class Semantic Definition

Equipment is an apparatus used to perform work, energy conversion or heat transfer.

Attribute and Relationship Definitions

Inherited Classes

Attributes and Relationships

	Attribute / Relation	Definition	Data or Relation Type	Min	Max	Default
	GenericType	Predefined generic types are specified in an Enumeration. A TypeDefinition is available for each generic type (as the required attributes differ). Use Type Definition corresponding to this generic type.	IfcEquipmentTypeEnum	AirFilter	UnitHeater	Motor

Formal Propositions:

None

Interface Definitions

• I_Equipment

Runtime Type Definitions

Geometry Use Definitions

Object Geometry in Context

The geometric representation of IfcEquipment is given by the IfcProductShape, allowing multiple geometric representations. Included are:

Local Position

The local position for IfcEquipment is defined in its supertype, IfcProduct. It is defined by the

• IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

The standard geometric representation of IfcEquipment is defined using explicit geometry. The faceted B-Rep capabilities (with or without voids) shall be supported for standard representation.

Currently, the usage of attribute driven geometry for IfcEquipment is not supported.

Class IfcFixture

EXPRESS Definition

Class Semantic Definition

Permanently attached appendage, appliance, or device that is connected to a building system (e.g. plumbing and electrical fixtures).

Attribute and Relationship Definitions

Inherited Classes

Attributes and Relationships

	Attribute / Relation	Definition	Data or Relation Type	Min	Max	Default
	GenericType	Predefined generic types are specified in an Enumeration. A TypeDefinition is available for each generic type (as the required attributes differ). Use Type Definition corresponding to this generic type.	IfcFixtureTypeEnum	Electrical	Plumbing	Electrical

Formal Propositions:

None

Interface Definitions

• I_Fixture

Runtime Type Definitions

Geometry Use Definitions

Object Geometry in Context

The geometric representation of IfcFixture is given by the IfcProductShape, allowing multiple geometric representations. Included are:

Local Position

The local placement for IfcFixture is defined in its supertype, IfcProduct. It is defined by the

• IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

The standard geometric representation of IfcFixture is defined using explicit geometry. The faceted B-Rep capabilities (with or without voids) shall be supported for standard representation.

Currently, the usage of attribute driven geometry for IfcFixture is not supported.

Class IfcDiscreteElement

EXPRESS Definition

Class Semantic Definition

This class defines elements in a building services system that do not participate as either equipment or distribution elements, such as insulation or attaching elements. This class will be more fully elaborated in future IFC versions.

Attribute and Relationship Definitions

Inherited Classes

Attributes and Relationships

	Attribute / Relation	Definition	Data or Relation Type	Min	Max	Default
	GenericType	Predefined generic types are specified in an Enumeration. A TypeDefinition is available for each generic type (as the required attributes differ). Use Type Definition corresponding to this generic type.	IfcDiscreteElementTypeEnum	Insulation	Insulation	Insulation

Formal Propositions:

None

Interface Definitions

• I_DiscreteElement

Runtime Type Definitions

Geometry Use Definitions

Object Geometry in Context

The geometric representation of IfcDiscreteElement is given by the IfcProductShape, allowing multiple geometric representations. Included are:

Local Position

The local placement for IfcDiscreteElement is defined in its supertype, IfcProduct. It is defined by the

• IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

The standard geometric representation of IfcDiscreteElement is defined using explicit geometry. The faceted B-Rep capabilities (with or without voids) shall be supported for standard representation.

Currently, the usage of attribute driven geometry for IfcDiscreteElement is not supported.

Class IfcDistributionElement

EXPRESS Definition

Class Semantic Definition

This class defines elements in a building services system that facilitate the distribution of matter, such as air or water. This class is introduced in this version of IFC as a placeholder and will be more fully elaborated in future IFC versions.

Attribute and Relationship Definitions

Inherited Classes

Attributes and Relationships

	Attribute / Relation	Definition	Data or Relation Type	Min	Max	Default
	GenericType	Predefined generic types are specified in an Enumeration. A TypeDefinition is available for each generic type (as the required attributes differ). Use Type Definition corresponding to this generic type.	IfcDistributionElementTypeEnum	NotYet Defined	NotYet Defined	NotYe tDefined

Formal Propositions:

None

Interface Definitions

• I_DistributionElement

Runtime Type Definitions

Geometry Use Definitions

Object Geometry in Context

The geometric representation of IfcDistributionElement is given by the IfcProductShape, allowing multiple geometric representations. Included are:

Local Position

The local placement for IfcDistributionElement is defined in its supertype, IfcProduct. It is defined by the

• IfcLocalPlacement, which defines the local coordinate system that is referenced by all geometric representations.

Standard Geometric Representation

The standard geometric representation of IfcDistributionElement is defined using explicit geometry. The faceted B-Rep capabilities (with or without voids) shall be supported for standard representation.

Currently, the usage of attribute driven geometry for IfcDistributionElement is not supported.