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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;