# Building Geometry

## Input and configuration overview

## Implementation Notes

All geometry elements of a building are assumed to be rectangles

Roof is modeled as a flat roof

Defined glazing ratio is applied to each wall. If a wall is too small or resulting window is too small (see configuration in cesarp.geometry), the window is not modelled. The so missing window area is not compensated for, thus the overall glazing ratio might be lower than you defined. You will be warned when resulting glazing ratio differs more than 2% (for details see config entries for “GLAZING_RATIO_CHECK” in cesarp.geometry package)

Footprint vertices are assumed to form a closed polygon and must be in counter-clockwise order

## Windows

**Window sill**absorptance property was set to 0.5 but sill depth was 0 with Matlab CESAR, so Window sill is now left to default (all 0)**Window divider**were set in Matlab CESAR, but as we only have a quite rough glazing ratio estimation and not all buildings have windows with dividers, modeling dividers is not reasonable. Those properties will not be set with CESAR-P.**Window width / Frame width**in Matlab CESAR version, minimal window width was defined with 0.04m and frame width also with 0.04m. To make sure that the frame does not overlap itself, minimal window width was set to 0.08m in CESAR-P.**View Factor to ground**for windows there was a fixed view factor to ground of 0.5 set in CESAR Matlab. As autocalculate makes no difference in simulation results for the nine example buildings, CESAR-P sets view factor to ground to autocalculate.