chriswmackey
commented
5 years ago Thanks for point this out @saeranv . To clarify a little more, when the "Opening Effectiveness" of the ZoneVentilation:WindandStackOpenArea is not set to "autocalculate", the wind direction is discounted. You will see that I recently exposed this as an option on the HB Airflow component: https://github.com/mostaphaRoudsari/honeybee/commit/2d4c2af515afd19c8bd37598270f9e284edda4f8 This was in response to this forum request: https://discourse.ladybug.tools/t/remarks-on-hb-natural-ventilation-height-difference/6646/3
Hi @alexandermatthias,
Fantastic job with the Honeybee Wiki, definitely a resource I plan to use while introducing others to HB! I was just reading through it today and noticed what seems to be a small error in Energy Modeling Assumptions regarding airflow accounting for wind direction.
Specifically, there's at least one airflow model HB uses (that I know of) that does account for wind direction: the ZoneVentilation:WindandStackOpenArea. That is what the Effective Angle input is doing, it's calculating the angle difference between the window normal and the wind direction, and using that to modify autocalculated opening effectiveness values (0.55 for perpendicular, 0.3 for diagonal wind direction).