What is meant by heat transfer?

Heat transfer is the transport of thermal energy due to a temperature difference across a thermodynamic system boundary (in the case of the passive house: building envelope). The energy transported in this way is known as “heat” and is a variable belonging to the process. The heat transfer is always in the direction from the warmer to the colder area. In other words, heat transport always strives to balance energy across system boundaries.

The physical quantity for the extent of heat transport is the heat flow, that is the power that flows through per square meter perpendicular to the surface [measured in W/m² (watts per square meter). As a rule, the heat flow (at least for small temperature differences) is proportional to the difference in temperatures. If divided by this temperature difference, a quantity is obtained which characterises the heat transfer capacity of the enveloping surface component: This is the heat transfer coefficient or U-value. Its unit of measurement is thus W/(m²K) (watts per square metre and per Kelvin), where 1 K temperature difference is exactly equal to 1 °C temperature difference.

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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