Why is a heating load calculation based on convection too high for a wall heating system?
Since in classical heating by convection, the entire room air must first be heated until a sensation of warmth occurs, 3 factors must be taken into special consideration when dimensioning such a heating system and must be included with buffer. These are
- the transmission heat loss
- the ventilation heat loss and
- the reheating load.
As radiant heating acts directly on the body when it hits the ground, these three factors play a much smaller role, as the thermal radiation is available continuously regardless of the room temperature. This is also shown, for example, by the fact that with wall heating, approx. 3 degrees room temperature can be saved - of course, with the same feeling of warmth.