Draft
International Standard
ISO/DIS 20589
Glass in building — Determination of the emissivity
Reference number
ISO/DIS 20589
Edition 1
Projet Norme internationale
Preview
ISO/DIS 20589
86325
Indisponible en français
Projet de Norme internationale au stade enquête auprès des membres de l’ISO.

ISO/DIS 20589

ISO/DIS 20589
86325
Langue
Format
CHF 63
Convertir les francs suisses (CHF) dans une autre devise

Résumé

This document 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. The procedure, being based on spectrophotometric regular reflectance measurements at near normal incidence on materials that are non-transparent in the infrared region, 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 can be applied with caution to any glazing component provided its surfaces are flat and non-diffusing (see non-diffusing glazing component ) and it is non-transparent in the infrared region (see glazing component non-transparent in the infrared region ). Although transmittance measurements are included in this document, they are only necessary to check if the specimen is non-transparent in the infrared region in the context of this document (see glazing component non-transparent in the infrared region). If the specimen is transparent in the infrared region, this document is not applicable.

Informations générales

  •  : Projet

    Vous pouvez contribuer à l’élaboration de ce projet de Norme internationale en contactant le membre national

    : Mise au vote du DIS: 12 semaines [40.20]
  •  : 1
  • ISO/TC 160
    81.040.20 
  • RSS mises à jour

Vous avez une question?

Consulter notre Aide et assistance