Echangeur air-air

An air-to-air heat recovery device employs a counter-flow heat exchanger between inbound and outbound air flow. It is typically used to transfer heat from warmer air in one chamber to cooler air in the second chamber (i.e., typically used to recover heat from the conditioned air being exhausted and the outside air being supplied to a building), resulting in energy savings from reduced heating (or cooling) requirements.

HISTORY  New entity in IFC4

Common Use Definitions

The following concepts are inherited at supertypes:

 Instance diagram

Object Typing

The Object Typing concept applies to this entity as shown in Table 441.

Table 441 — IfcAirToAirHeatRecovery Object Typing

Property Sets for Objects

The Property Sets for Objects concept applies to this entity as shown in Table 442.

Table 442 — IfcAirToAirHeatRecovery Property Sets for Objects

Quantity Sets

The Quantity Sets concept applies to this entity as shown in Table 443.

Table 443 — IfcAirToAirHeatRecovery Quantity Sets

Material Constituents

The Material Constituents concept applies to this entity as shown in Table 444.
CasingMaterial from which the casing is constructed.
MediaThe primary media material used for heat transfer.

Table 444 — IfcAirToAirHeatRecovery Material Constituents

Port Nesting

The Port Nesting concept applies to this entity as shown in Table 445.
 AirInletSINKAIRCONDITIONINGConditioned air in.
 AirOutletSOURCEAIRCONDITIONINGConditioned air out.
 ExhaustInletSINKAIRCONDITIONINGExhausted air in.
 ExhaustOutletSOURCEAIRCONDITIONINGExhausted air out.

Table 445 — IfcAirToAirHeatRecovery Port Nesting

XSD Specification:

 <xs:element name="IfcAirToAirHeatRecovery" type="ifc:IfcAirToAirHeatRecovery" substitutionGroup="ifc:IfcEnergyConversionDevice" nillable="true"/>
 <xs:complexType name="IfcAirToAirHeatRecovery">
   <xs:extension base="ifc:IfcEnergyConversionDevice">
    <xs:attribute name="PredefinedType" type="ifc:IfcAirToAirHeatRecoveryTypeEnum" use="optional"/>

EXPRESS Specification:

ENTITY IfcAirToAirHeatRecovery
SUBTYPE OF IfcEnergyConversionDevice;
PredefinedType : OPTIONAL IfcAirToAirHeatRecoveryTypeEnum;
CorrectPredefinedType : NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcAirToAirHeatRecoveryTypeEnum.USERDEFINED) OR ((PredefinedType = IfcAirToAirHeatRecoveryTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned : (SIZEOF(IsTypedBy) = 0) OR ('IFCHVACDOMAIN.IFCAIRTOAIRHEATRECOVERYTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));

Link to EXPRESS-G diagram EXPRESS-G diagram

Formal Propositions:

CorrectPredefinedType : Either the PredefinedType attribute is unset (e.g. because an IfcAirToAirHeatRecoveryType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned : Either there is no air-to-air heat recovery type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcAirToAirHeatRecoveryType.

Inheritance Graph:

ENTITY IfcAirToAirHeatRecovery
GlobalId : IfcGloballyUniqueId;
OwnerHistory : OPTIONAL IfcOwnerHistory;
Name : OPTIONAL IfcLabel;
Description : OPTIONAL IfcText;
ENTITY IfcObjectDefinition
HasAssignments : SET OF IfcRelAssigns FOR RelatedObjects;
Nests : SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy : SET OF IfcRelNests FOR RelatingObject;
HasContext : SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy : SET OF IfcRelAggregates FOR RelatingObject;
Decomposes : SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations : SET OF IfcRelAssociates FOR RelatedObjects;
ENTITY IfcObject
ObjectType : OPTIONAL IfcLabel;
IsDeclaredBy : SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares : SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy : SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy : SET OF IfcRelDefinesByProperties FOR RelatedObjects;
ENTITY IfcProduct
ObjectPlacement : OPTIONAL IfcObjectPlacement;
Representation : OPTIONAL IfcProductRepresentation;
ReferencedBy : SET OF IfcRelAssignsToProduct FOR RelatingProduct;
ENTITY IfcElement
Tag : OPTIONAL IfcIdentifier;
FillsVoids : SET [0:1] OF IfcRelFillsElement FOR RelatedBuildingElement;
ConnectedTo : SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements : SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements : SET OF IfcRelInterferesElements FOR RelatingElement;
HasProjections : SET OF IfcRelProjectsElement FOR RelatingElement;
ReferencedInStructures : SET OF IfcRelReferencedInSpatialStructure FOR RelatedElements;
HasOpenings : SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
IsConnectionRealization : SET OF IfcRelConnectsWithRealizingElements FOR RealizingElements;
ProvidesBoundaries : SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom : SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure : SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;
ENTITY IfcDistributionElement
HasPorts : SET OF IfcRelConnectsPortToElement FOR RelatedElement;
ENTITY IfcDistributionFlowElement
HasControlElements : SET [0:1] OF IfcRelFlowControlElements FOR RelatingFlowElement;
ENTITY IfcEnergyConversionDevice
ENTITY IfcAirToAirHeatRecovery
PredefinedType : OPTIONAL IfcAirToAirHeatRecoveryTypeEnum;

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