The floor is on the ground – thermal bridges.

Another example is the bridge caused by the floor on the ground.
The internal environment is separated into those adjacent to the wall and to the floor.
To simulate the heat flowing from deep ground, an auxiliary temperature environment was introduced 7 st. C.

We have:
Flux entering the external environment from the building
66,2816-12,8581 = 53,4235 W
We check by adding the floor and the wall
30,7244 + 22,6991 = 53,4235 W
That's exactly right
We calculate Ul for the floor on the ground in the case as above. U0 = 0.5208 W / m2K
Ul = (53,4238 – 40* U0) / 40K = 0,815 W / mK