Default inner convection coefficients
Created by: PGorzalka
What is the problem?
- According to ISO 6946, convective surface coefficients are 5.0 m²K/W for upward heat flow, 2.5 for horizontal and 0.7 for downward. In TEASER,
inner_convection
values default to- 2.7 for walls: reasonable because close to horizontal
- 1.7 for ground floors: somewhat reasonable if basement exterior walls are considered ground floors (which is afaik not the case in archetype buildings)
- 1.7 for rooftops: maybe I miss a point, but this seems to be a mistake.
Why do we want to solve it?
- The current implementation works fine with the archetype building parts: The layer specifications there seem to be designed to meet the U-values specified in the typologies considering the current convection coefficients. However, a model built from it will overestimate radiation vs. convection for roofs and underestimate it for ground floors. Furthermore, custom layer specification may lead to unexpected results.
How do we want to solve it?
- Correct all default values
- Adjust layer specifications of rooftop archetype building parts (this is a big amount of work which I don't think I could do)