Thermal optimization of windows

The thermal optimization of a window must address air tightness and the conductivity of the construction. To ensure air tightness, there should be at least two effective perimeter seals for an operable window sash and a reliable seal from the frame to the wall.

Source: www.passivehouse.com

Figure 9.5.2 Condensation at the inner surface oof a standard window with an aluminium edge system and small glazing rebate oof only 15 mm

Source: www.passivehouse.com

Figure 9.5.2 Condensation at the inner surface oof a standard window with an aluminium edge system and small glazing rebate oof only 15 mm

Reducing conducted heat losses is more complex and involves the effects of the frame (Uf), glazing (Ug) and thermal bridge at the glass edge. This requires analysis using a two-dimensional thermal bridge calculation, described in ISO 10077 (2000). This calculation divides the window frame properties in two parts: the U-value of the frame (Uf) and the linear thermal bridge loss coefficient (^g). The properties of the window frames mentioned in this section were calculated using this method.

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