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Climate Zone E (cold)
- For climate zone E (cold zone), the most important factor is the thermal transmittance of the glass, as by lowering its value from 2 to 1 (50% reduction) we would obtain a saving of almost 12% in energy consumption. The second most important factor is air permeability, with a saving of more than 5% when comparing a class 2 window with a class 4 window.
- The second most important factor is air permeability, with a saving of more than 5% when comparing a class 2 window with a class 4 window. It is worth mentioning that the most important factor is that the window maintains its permeability throughout its service life, a characteristic strength of Aluminium windows with Thermal Break.
- In third and fourth place, although with less influence on energy efficiency, we have the transmittance of the frame and the percentage of the frame over the opening surface. In the study we observed that by installing a frame with a large improvement in its transmittance, going from 3.5 to 2 (an improvement of 43%), we only obtain a saving of 1% on the energy consumed. We obtain a similar saving by going from a frame percentage of 30% to 20% of the total opening surface, but with the advantage of a brighter environment.
- The last important factor is the solar factor, which, as it increases, increases the energy consumption of the building. This is due to the fact that the solar radiation captured by the house in winter produces savings in heating and by making it difficult for it to pass through with high solar control glass, this effect is prevented.
