Natural Ventilation - What are reasonable ACH results?

asked 2021-11-04 08:04:38 -0500

Elisa Matar's avatar

updated 2022-02-23 12:14:41 -0500

Hi all!

I'm simulating a large office building which uses natural ventilation, using the Airflow Network components in Energy Plus. The office spaces are roughly 20 m² and I have 2 top hung windows per room (their area in total is 3.5 m²), which I calculated as having 18% opening height factor and 100% opening width factor. I'm only just starting to simulate natural ventilation, so I'm not really aware of what would be an acceptable range of results. When opened, these windows are providing up to 11 ACH to these rooms (I'm checking this with the AFN Zone Infiltration Air Change Rate output; the infiltration itself only accounts for around 1 ACH, the rest is due to the windows).

Does anyone know if these results seem reasonable? I did some research, but I couldn't find anything conclusive for this quality check. Or does anyone know any sources where I could read more about ACH due to natural ventilation?

Thanks in advance!

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