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Norm

ÖNORM EN 674

Issue date: 2011 08 01

Glass in building - Determination of thermal transmittance (U value) - Guarded hot plate method

This European Standard specifies a measurement method to determine the thermal transmittance of glazing with flat and parallel surfaces. Structured surfaces, e.g. patter...
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Publisher:
Austrian Standards International
Format:
Digital | 12 Pages
Language:
German | English | Download GER/ENG
Optionally co-design standards:
This European Standard specifies a measurement method to determine the thermal transmittance of glazing with flat and parallel surfaces. Structured surfaces, e.g. patterned glass, can be considered to be flat. This European Standard applies to multiple glazing with outer panes which are not transparent to far infrared radiation, which is the case for soda lime silicate glass products, borosilicate glass and glass ceramics. Internal elements may be far infrared transparent. The procedure specified in this European Standard determines the U value1) (thermal transmittance) in the central area of glazing. The edge effects, due to the thermal bridge through the spacer of an insulating glass unit or through the window frame are not included. Furthermore energy transfer due to solar radiation is not taken into account. The procedure specified in this European Standard should generally only be considered when the calculation method detailed in EN 673 is inappropriate or unsuitable. The document for the calculation of the overall U value of windows, doors and shutters (see [3]) gives normative reference to the U value evaluated for the glazing components according to this standard. A vertical position of the glazing is specified.
ÖNORM EN 674
2011 08 01
Glass in building - Determination of thermal transmittance (U value) - Guarded hot plate method
Norm
ÖNORM EN 674
1998 03 01
Glass in building - Determination of thermal transmittance (U value) - Guarded hot plate method
Norm
Norm
ÖNORM EN 12898
Issue date : 2001 04 01
Glass in building - Determination of the emissivity
Norm
ISO 8302:1991
Issue date : 1991 08 15
Thermal insulation — Determination of steady-state thermal resistance and related properties — Guarded hot plate apparatus