What is the fRsi value?

The temperature factor f*Rsi is a dimensionless quantity for the assessment of thermal bridges. The higher the temperature factor, the better the thermal insulation in this area. A small factor indicates a low room-side surface temperature.

By entering the surface temperature, air temperature inside and outside, the temperature factor f*Rsi is determined. The result should be greater than 0.7, otherwise there is no longer any condensation on the surface and the risk of mould formation increases.

In order to reduce the risk of mould formation through constructive measures, the temperature factor fRsi must meet the minimum requirement fRsi ≥ 0.70 at the most unfavourable point for all constructive, shape-related and material-related thermal bridges that deviate from DIN 4108 Supplement 2. The temperature factor can be used as a parameter for assessing the energy quality of window elements.

Welcome to ENERsign® Price Configurator with U-Value window Calculation:

You don’t want to go through the trouble of obtaining various offers, but would like to find out the recommended prices and U-values for our high-quality ENERsign®primus window? Then try our price configurator, here you can put together your desired windows as you wish and try out different sizes and designs.

All you need is the desired dimensions and window types and you can configure immediately. The window price and U-value window will be adjusted automatically, so that you always have an overview and can compare directly.

We are uncompromising in the product we offer:
ENERsign®primus elements with at least triple glazing with a U-value glass of 0.52 W/m²K and a g-value of 53%. Other designs and special glasses are available on request.

Welcome to the ENERsign® U-Value window configurator:

The U-value window is also called heat transfer coefficient and according to the standard DIN EN 10077 it indicates the amount of thermal energy lost through a window to the outside.

The U-value window is calculated using the formula W/(m²K), i.e. watts per square metre and Kelvin. This value refers to the entire window and defines the amount of energy per unit of time that flows through an area of one square meter when the air temperature on both sides differs by one Kelvin. The lower this value is, the less energy or heat the window emits.

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Gesamtpreis (inkl. 19% MwSt)
0€ - 0
Potentially avoided CO2 emissions over 30 years :
Potentially saved energy and CO2 costs over 30 years:
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0 (W/m2K)
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