EN ISO 12631:2017

European foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and subscripts
5 Description of the methods
6 Methodologies for the calculation of curtain wall
  transmittance
7 Single assessment method
8 Component assessment method
9 Report
Annex A (normative) - Input and method selection data
        sheet - Template
Annex B (informative) - Input and method selection data
        sheet - default choices
Annex C (normative) - Regional references in line with
        ISO Global Relevance Policy
Annex D (normative) - Linear thermal transmittance of junctions
Annex E (normative) - A method for calculating the thermal
        effect of screws using a 2D numerical method and the
        procedures specified in ISO 10077-2
Annex F (normative) - Ventilated and unventilated air spaces
Bibliography

ISO 12631:2017 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.NOTE Table 1 in the Introduction shows the relative position of ISO 12631:2017 within the set of EPB standards in the context of the modular structure as set out in ISO 52000-1.