Material Details
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Each material contains a list of physical and
thermal properties data. This data can be edited to suit your project’s needs.
A typical material may have the following physical and thermal properties:
- Density — The
material density or mass per unit volume.
- Conductivity — The
property of a material that indicates its ability to conduct heat.
- Specific heat — The
amount of heat required to change a material's temperature by a given amount.
- Vapor resistivity —
The time and pressure needed to force a unit amount of water vapor through the
material layer.
- Inner Surface
Emissivity — The measure of the efficiency in which an inner surface emits
thermal energy. It is defined as the fraction of energy being emitted relative
to that emitted by a thermally black surface (a black body). A black body is a
material that is a perfect emitter of heat energy and has an emissivity value
of 1. A material with an emissivity value of 0 would be considered a perfect
thermal mirror.
- Outer Surface
Emissivity — The measure of the efficiency in which an outer surface emits
thermal energy. It is defined as the fraction of energy being emitted relative
to that emitted by a thermally black surface (a black body). A black body is a
material that is a perfect emitter of heat energy and has an emissivity value
of 1. A material with an emissivity value of 0 would be considered a perfect
thermal mirror.
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Material Details for Glass
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When a glass material is selected from the Materials
tab, additional glass lighting properties are enabled.
- Density — The
material density or mass per unit volume.
- Conductivity — The
property of a material that indicates its ability to conduct heat.
- Specific heat — The
amount of heat required to change a material's temperature by a given amount.
- Vapor resistivity —
The time and pressure needed to force a unit amount of water vapor through the
material layer.
- Light transmittance
— Displays the amount of daylight striking the glass glazing that passes
through to the inside as a ratio. Glass containing glazing with a high light
transmittance appear relatively clear and provide sufficient daylight and
unaltered views; however, they can create glare problems. Glass containing
glazing with low light transmittance are best used in highly glare-sensitive
conditions, but can create gloomy interiors under some weather conditions and
diminished views.
- Average solar
transmission — Displays Average solar transmission for the selected glass
material. Solar transmission refers to the ratio of the amount of total solar
energy in the full solar wavelength range (300-2,100 nanometers) that is
allowed to pass through a glazing system to the amount of total solar energy
falling on that glazing system. An average is computed using the glazing
database solar transmission data for solar transmission angles between 0° and
90°.
- Average solar
reflection — Displays Average solar reflection for the selected glass material.
Solar reflectance refers to the ratio of total solar energy which is reflected
outward by the glazing system to the amount of total solar energy falling on
the glazing system. On filmed windows this reflectance is a function of the
side of the film facing the window surface. An average is computed using the
glazing database solar reflection data for solar reflection angles between 0°
and 90°.
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Transmission/Reflection data — Displays transmission and reflectance values for
angles between 0° and 90° in a tabular form. The table columns are:
- Graph — Displays
the transmission and reflectance data for angles between 0° and 90° with two
curves on a graph. The transmission curve is colored red and the reflectance
curve is colored blue. The graph axes are:
- Angle – The
graph’s X axis plots the angles between 0° and 90°.
- Value – The
graph’s Y axis plots the values for transmittance and reflection for angles
between 0° and 90°.
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