Draft
International Standard
ISO/DIS 20589
Glass in building — Determination of the emissivity
Reference number
ISO/DIS 20589
Edition 1
Draft International Standard
Read sample
ISO/DIS 20589
86325
This Draft International Standard is in the enquiry phase with ISO members.

ISO/DIS 20589

ISO/DIS 20589
86325
Language
Format
CHF 63
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Abstract

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.

General information

  •  : Under development

    You can help develop this draft international standard by contacting your national member

    : DIS ballot initiated: 12 weeks [40.20]
  •  : 1
     : 17
  • ISO/TC 160
    81.040.20 
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