How to consider the impact of shading devices on ventilation?

Hi! Firstly I would like to thank this forum for being a great help on my journey to learn E+.

I've been searching on this but i could not find a definitive answer. I'm testing out adaptations to promote thermal comfort, including shading devices, but i'm not sure if E+ (vers. 2024.1.0) considers the impact of devices, such as blinds, on ventilation, since these devices often hinder airflow.

I get the impression that E+ does not consider any impact of shading devices on ventilation, but could not find one definitive answer. If it is true, how can I adapt my simulations so this impact is considered?

I modeled my building with the OpenStudio plugin on SketchUp, but doing most changes to the IDF file directly through EP-Launch.

Emanuela

asked 2024-05-21 08:52:45 -0500

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Aaron Boranian

updated 2024-05-21 15:39:27 -0500

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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.