Additional information. The thermal insulation of windows and doors.
Information – Thermal Insulation
The basic parameter characterizing the thermal insulation properties of the window is Uw-heat transfer coefficient. Uw determines the amount of heat lost through the window from the inside out, measured in watts per square meter and Kelvin (W / m2K) Lower Uw means better thermal insulation of windows. Uw represents the weighted average heat transfer coefficients Uf of the window frame and glazing Ug.
Obtaining expected coefficient Uw is the right mix of the selected profile window with an appropriate set of glass. Example configurations of window profiles and glazing allow to obtain the following coefficients Uw presented in the table below.
Lower Uw greatly increases the comfort of the building and reduces energy consumption and thus operating costs. The reduction coefficient Uw of 0.1 W / m2K saves approx. 1.2 liters of heating oil per square meter of window surface (average detached house, a saving of 650-750 liters of heating oil per year).
The basis for obtaining a lower coefficient of windows Uw is to make their profiles Class A (only those we use) that is defined by the standard RAL (RAL mark is awarded by the Association d / s quality window systems made of plastic).
|Thickness profile||Uf (W/m2K)||Glass||Ug (W/m2K)||Uw (W/m2K)|
|(PVC) 70 mm||1,3||2 windows||1,1||1,3|
|(PVC) 70 mm||1,3||3 windows||0,5||0,8|
|(PVC) 82 mm||1,0||2 windows||0,6||0,89|
|(PVC) 82 mm||1,0||3 windows||0,5||0,7|
|(PVC) 90 mm||1,0||2 windows||0,6||0,85|
|(PVC) 90 mm||1,0||3 windows||0,5||0,68|