Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Restricted airflow through windows (natural ventilation, infiltration) due to insect screens, blinds or even overhead awnings can be taken into account when setting an opening's discharge coefficient (Cd). Tricky, as a window's discharge coefficient can vary based on a number of factors, such as window type, proximity of obstructions (like an awning), proximity of other openings, etc. I haven't looked into this for some years now, but a quick Google search offers a number of recent lab (or CFD) experiments towards determining Cd's for natural ventilation (e.g. here, here, here). Hope this is helpful.
