Norm

NEN-EN 674:1992 Ontw. en

Meetmethode voor de bepaling van de warmtedoorgangscoëfficiënt (U-waarde) van meervoudige beglazing (methode met afgeschermde verwarmingsplaat)

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Over deze norm

Status Ingetrokken
Aantal pagina's 8
Commissie Vlakglas
Gepubliceerd op 01-03-1992
Taal Engels
This European Standard specifies a measurement procedure used to determine the thermal transmittance of multiple sealed glazing with a flat and parallel surfaces including cast and figured rolled glass. This standard applies to multiple sealed glazing with outer panes which are not transparent to far infrared radiation, which is the case for normal window glass. However internal elements may be far infrared transparent. This standard makes possible the determination of the U-values in the central area of the multiple glazing. Edge effects, due to the thermal bridge through the spacer of a sealed glazing unit or through the frame, are not included. Furthermore energy transfer due to solar radiation is not taken into account. For the purposes of product comparison a vertical position of the glazing is specified. The determination of the thermal transmittance is performed for conditions which will correspondent to the average situation for glazing in practice. In this way a fair comparison between different products becomes possible. The measuring method according to the present standard should only be used in cases in which the calculation method becomes impossible or complicated, e.g. glazings with internal infrared transmitting elements, or coatings with a modified emissivity on structured surfaces.

Details

ICS-code 81.040.20
Nederlandse titel Meetmethode voor de bepaling van de warmtedoorgangscoëfficiënt (U-waarde) van meervoudige beglazing (methode met afgeschermde verwarmingsplaat)
Engelse titel Measuring procedures for the determination of the thermal transmittance (U value) of multiple glazing (guarded hot plate method)
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Normatieve verwijzingen
  • 89/106/EEG, Bouwproducten

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