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Climate controll by the floor
The conference room has a large window to the south side. When the sun shines into the room, the floor is direct heated up. A floor heating can take away the heat.While floor or wall systems usual take only 40 W/m², here in this special case up to 250 W / m².
So there is the heat taken waay at the same place where brought in the room.
At a cooling ceiling, the floor would be heated up by the sun, warm air would ascend and only cooled at the ceiling.