This standard specifies methods for the calculation of the thermal transmittance of windows and doors consisting of glazed or opaque panels fitted in a frame, with and without shutters.
It allows for:
- different types of glazing (glass or plastics; single or multiple glazing; with or without low emissivity coatings; with spaces filled with air or other gases);
- various types of frames (wood; plastic; metallic with and without thermal barrier; metallic with pinpoint metallic connections or any combination of materials);
- where appropriate, the additional thermal resistance introduced by different types of shutters, depending on their air permeability.
Curtain walls and other structural glazings, which are not fitted in a frame, are excluded from this standard. Roof windows are also excluded because of their complex geometrical frame sections.
Default values for glazings, frames and shutters are given in the informative annexes. Thermal bridge effects at the rebate or joint between the window or door frame and the rest of the building envelope are excluded from the calculation.
The calculation does not include:
- effects of solar radiation;
- heat transfer caused by air leakage;
- calculation of condensation;
- ventilation of air spaces in double and coupled windows.
ISO 10077-1:2000 history
2017ISO 10077-1:2017 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: General
2009ISO 10077-1:2006/cor 1:2009 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: General; Technical Corrigendum 1
2006ISO 10077-1:2006 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: General
2000ISO 10077-1:2000 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: Simplified method