Connections of window and door joinery with partitions (walls) – thermal bridges.

The next thermal bridges are the connections of the window and door joinery with partitions (walls).
The bottom connection between the window and the wall is presented here, taking into account the window sill and the eaves. Both elements are of great importance here (as well as their location in relation to the wall, windows and each other).

Known U0 for the wall
Known U0 for the window (accepted 2,0 W / m2K cannot be the U0 of the glass, because there is no framework)‏
Ul= 70,7189/40 – 0,5208*0,5 – 1,6*2,0 = 0,508 W / mK
attention: The influence of the lower edge, i.e.. with a window sill and a drip. The influence of the vertical and top edges will be different and less. Of course, it also has to be taken into account.
attention: In the example shown, a wooden frame with a simple structure is used. In the case of aluminum or plastic frames it is important, to reflect the shape and number of chambers as well as internal stiffening elements as accurately as possible. It all matters to the model.

attention: As a standard, we consider separately the so-called. "opaque partitions" and "transparent parts" (gross windows - together with frames), because the standard requirements for both types of partitions are different.
This is why, also in this example, the internal environment should be separated into adjacent to the wall part and to the window part, thus obtaining two Ul factors for both portions of the partition.
Final balancing (calculation) U coefficient should also be separated for the window and wall parts.