IfcHygroscopicMaterialProperties

Definition from IAI: A container class with material hygroscopic properties defined in IFC specification.

> HISTORY: New entity in Release IFC2x.

EXPRESS specification:

ENTITY IfcHygroscopicMaterialProperties
SUBTYPE OF ( | IfcMaterialProperties);
UpperVaporResistanceFactor | : | OPTIONAL IfcPositiveRatioMeasure;
LowerVaporResistanceFactor | : | OPTIONAL IfcPositiveRatioMeasure;
IsothermalMoistureCapacity | : | OPTIONAL IfcIsothermalMoistureCapacityMeasure;
VaporPermeability | : | OPTIONAL IfcVaporPermeabilityMeasure;
MoistureDiffusivity | : | OPTIONAL IfcMoistureDiffusivityMeasure;
UNIQUE
UR11 | : | Material;
END_ENTITY;

Attribute definitions:

UpperVaporResistanceFactor | : | The vapor permeability relationship of air/material (typically value > 1), measured in high relative humidity (typically in 95/50 % RH).
LowerVaporResistanceFactor | : | The vapor permeability relationship of air/material (typically value > 1), measured in low relative humidity (typically in 0/50 % RH).
IsothermalMoistureCapacity | : | Based on water vapor density, usually measured in [m3/ kg].
VaporPermeability | : | Usually measured in [kg/s m Pa].
MoistureDiffusivity | : | Usually measured in [m3/s].

Inheritance graph

ENTITY IfcHygroscopicMaterialProperties;
ENTITY IfcMaterialProperties;
Material | : | IfcMaterial;
ENTITY IfcHygroscopicMaterialProperties;
UpperVaporResistanceFactor | : | OPTIONAL IfcPositiveRatioMeasure;
LowerVaporResistanceFactor | : | OPTIONAL IfcPositiveRatioMeasure;
IsothermalMoistureCapacity | : | OPTIONAL IfcIsothermalMoistureCapacityMeasure;
VaporPermeability | : | OPTIONAL IfcVaporPermeabilityMeasure;
MoistureDiffusivity | : | OPTIONAL IfcMoistureDiffusivityMeasure;
END_ENTITY;