UNE-EN ISO 12631:2017

This document specifies a method for calculating the thermal transmittance of curtain walls consisting

of glazed and/or opaque panels fitted in, or connected to, frames.

The calculation includes:

different types of glazing, e.g. glass or plastic; single or multiple glazing; with or without low

emissivity coating; with cavities filled with air or other gases;

frames (of any material) with or without thermal breaks;

different types of opaque panels clad with metal, glass, ceramics or any other material.

Thermal bridge effects at the rebate or connection between the glazed area, the frame area and the

panel area are included in the calculation.

The calculation does not include:

effects of solar radiation;

heat transfer caused by air leakage;

calculation of condensation;

effect of shutters;

additional heat transfer at the corners and edges of the curtain walling;

connections to the main building structure nor through fixing lugs;

curtain wall systems with integrated heating.

Table 1 shows the relative position of this document within the EPB package of standards.