Wärmedurchlassgrad

Wärmedurchlassgrad is a German term that translates to "heat transmission coefficient" or "thermal transmittance." It is a measure of how well a building component, such as a wall, roof, or window, allows heat to pass through it. The symbol commonly used for Wärmedurchlassgrad is U, and it is typically measured in units of Watts per square meter per Kelvin (W/(m²·K)).

A lower Wärmedurchlassgrad indicates better insulation and less heat loss. Conversely, a higher Wärmedurchlassgrad signifies poorer insulation and greater heat transfer. This value is crucial in building physics and energy efficiency calculations. It helps determine the thermal performance of a building envelope and is used to assess compliance with building regulations and to estimate heating and cooling energy requirements.

The Wärmedurchlassgrad is influenced by various factors, including the materials used in the construction of the component, their thickness, and the presence of any air gaps or thermal bridges. For complex building elements, the overall Wärmedurchlassgrad is often calculated by considering the U-values of individual layers and then combining them. Understanding and minimizing the Wärmedurchlassgrad is a key strategy for improving the energy efficiency of buildings, reducing energy consumption, and enhancing thermal comfort.