IFC 4.3.0.1 (IFC4X3) development

8.10.4.8 Pset_MaterialOptical

8.10.4.8.1 Semantic definition

A set of optical properties of materials.

8.10.4.8.2 Applicable entities

8.10.4.8.3 Properties

Name Property Type Data Type Description
VisibleTransmittance IfcPropertySingleValue IfcNormalisedRatioMeasure

Transmittance at normal incidence (visible). Defines the fraction of the visible spectrum of solar radiation that passes through per unit area, perpendicular to the surface.

SolarTransmittance IfcPropertySingleValue IfcNormalisedRatioMeasure

The ratio of incident solar radiation that directly passes through a system (also named τe). Note the following equation Asol + Rsol + Tsol = 1

ThermalIrTransmittance IfcPropertySingleValue IfcNormalisedRatioMeasure

Thermal IR transmittance at normal incidence. Defines the fraction of thermal energy that passes through per unit area, perpendicular to the surface.

ThermalIrEmissivityBack IfcPropertySingleValue IfcNormalisedRatioMeasure

Thermal IR emissivity: back side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "back" side of the material.

ThermalIrEmissivityFront IfcPropertySingleValue IfcNormalisedRatioMeasure

Thermal IR emissivity: front side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "front" side of the material.

VisibleReflectanceBack IfcPropertySingleValue IfcNormalisedRatioMeasure

Reflectance at normal incidence (visible): back side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.

VisibleReflectanceFront IfcPropertySingleValue IfcNormalisedRatioMeasure

Reflectance at normal incidence (visible): front side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.

SolarReflectanceBack IfcPropertySingleValue IfcNormalisedRatioMeasure

Reflectance at normal incidence (solar): back side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.

SolarReflectanceFront IfcPropertySingleValue IfcNormalisedRatioMeasure

Reflectance at normal incidence (solar): front side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.

Table 8.10.4.8.A

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8.10.4.8.4 Changelog

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