English
The K value is a physical quantity that measures the thermal insulation performance of a material, that is, the heat transfer coefficient.
The K value of architectural glass is defined as: under standard conditions, the heat transfer from one side of the unit area of the glass component to the other side of the air per unit time. The K value is mainly used to measure the heat transfer through the glass system. This value is a function of temperature. The calculation method is the heat passing through one square meter of glass per hour at a temperature difference of one degree Celsius. The unit system is w/m2.k, where w is the heating power, m2 is the glass area, and k is the temperature in Celsius.
The higher the K value, the better the heat transfer performance, but the worse the heat preservation performance.
The meaning of common letter codes:
Uw — heat transfer coefficient of the whole uPVC window (W/m2•K);
Ug — the heat transfer coefficient of glass (W/m2•K);
Ag — the area of the glass m2;
Uf — the heat transfer coefficient of the profile (W/m2•K);
Af — the area of the profile m2;
Lg — the perimeter of the glass m;
Lumei 70 series uPVC Window related technical parameters:
1. Uf =1.0 W/m2•K
2. Windowing parameters
