I have simple model as below setting WWR to 0.4 for all direction.
However, when I look at the html result file generated by EnergyPlus, WWR for east direction is slightly smaller than 40% as below.
When I investigated html report, found that the one of the interior wall(I suppose) was categorized as exterior wall which increase total wall area for east direction and reduce WWR as a result.
I confirmed that all the points are matching together but still get this result.
Does anyone know what is the other possible reason and solution?