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Norm
ÖNORM EN 12898
Issue date: 2001 04 01
Glass in building - Determination of the emissivity
This European Standard specifies a procedure for determining the emissivity at room temperature of
the surfaces of glass and coated glass.
The emissivity is necessary f...
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Withdrawn
: 2019 06 15
Publisher:
Austrian Standards International
Format:
Digital | 15 Pages
Language:
German
| English
| Download GER/ENG
Currently valid:
Optionally co-design standards:
ICS
This European Standard specifies a procedure for determining the emissivity at room temperature of
the surfaces of glass and coated glass.
The emissivity is necessary for taking into account heat transfer by radiation from surfaces at the
standard temperature of 283 K in the determination of the U value and of the total solar transmittance
of glazing according to 1 to 5.
The procedure, being based on spectrophotometric regular reflectance measurements at near normal
incidence on non-infrared transparent materials, is not applicable to glazing components with at least
one of the following characteristics:
a) with rough or structured surfaces where the incident radiation is diffusely reflected;
b) with curved surfaces where the incident radiation is regularly reflected at angles unsuitable to
reach the detector while using regular reflectance accessories;
c) infrared transparent.
However, it may be applied with caution to any glazing component provided its surfaces are flat and
non-diffusing (see 3.6) and it is non-infrared transparent (see 3.7).