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How to model natural ventilation with OpenStudio?

asked 2014-10-17 09:17:26 -0500

setholmes's avatar

updated 2014-10-17 11:16:06 -0500

I am curious how to model natural ventilation using, or in tandem with, open studio (short of editing the IDF file directly); it appears the NREL group is not prioritizing the addition of an airflow network (which baffles me). Has anyone found / created a good workflow for implementing natural ventilation with Open Studio?

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answered 2014-10-17 10:49:20 -0500

Hey Seth, OpenStudio does understand the important of natural ventilation and addition of airflow network to OpenStudio is in the design stages. That work is being led by @Jason DeGraw at the Consortium for Building Energy Innovation. In the meantime, there are a few options in OpenStudio. The simplest would be to write EnergyPlus measures as Matt suggested, you could use either airflow network objects ( or the simpler ventilation design flow rate objects ( If you are familiar with CONTAM, you could try the OpenStudio->CONTAM translator, you could contact Jason for more information about that.

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I'll add that Tianzhen Hong and his colleagues at LBNL have written a natural ventilation measure for OpenStudio, but I don't believe it has been uploaded to the BCL yet. This was an EnergyPlus measure, and is intended to provide functionality until Jason's work is properly integrated into the SDK.

ljbrackney's avatar ljbrackney  ( 2014-10-17 11:26:49 -0500 )edit

answered 2014-10-17 10:41:40 -0500

updated 2015-04-06 11:33:06 -0500

What I have been doing with OpenStudio is I created a script to import either a ZoneVentilation:DesignFlowRate or ZoneVentilation:WindandStackOpenArea object with arguments for the thermal zone, schedule, etc. for any inputs I want as variables. You could create this script using the Measure Writing Guide for EnergyPlus measures or copy one from the BCL and modify to fit your measure needs. There is also a AvailabilityManager:HybridVentilation object I have not tried yet but may be worth looking into as well to import as a measure.

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I would like to ask if this is now functional? I see a new tab: Zone Ventilation Desing Flow Rate with Natural Ventilation. Can this be dropped in any zone regardless of equipment? Where does one find a description for how this works? Thank you in advance.

MattStewart's avatar MattStewart  ( 2015-09-02 07:43:36 -0500 )edit

@MattStewart: Where do you see the tab:Zone Ventilation Desing Flow Rate with Natural Ventilation?

Robert Zudel's avatar Robert Zudel  ( 2015-12-10 09:01:17 -0500 )edit

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Asked: 2014-10-17 09:17:26 -0500

Seen: 3,502 times

Last updated: Apr 06 '15