Glass in building - Spectrophotometric characteristics of glass products - Validation procedure for calculation tool.
STANDARD published on 1.7.2024
Designation standards: ČSN EN 17871
Classification mark: 701062
Catalog number: 519447
Publication date standards: 1.7.2024
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
This document provides a procedure to validate a calculation tool of spectrophotometric and thermal characteristics of the glass products following EN 410 or EN 673. It provides also the methodology to correctly use measured data in the calculation tools.
The following characteristics are included in the scope of this document:
- light transmittance (tv)
- light reflectance - both sides (rv, r´v)
- solar direct transmittance (te)
- solar direct reflectance - both sides (re, r´e)
- total solar energy transmittance (solar factor or g value) (g)
- thermal transmittance (U value) in the vertical position
The following characteristics are excluded from the scope of this document:
- UV transmittance (tuv)
- shading coefficient (SC)
- general colour rendering index (Ra)
- thermal transmittance (U value) at angles other than vertica