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How to measure air velocity of a room?

asked 2017-12-02 14:02:34 -0600

designer4's avatar

updated 2017-12-06 04:48:07 -0600

I have a classroom with one window as an opening, showed in figure A.

image description figure A

To improve the inside ventilation, I made another opening (to have cross ventilation), figure B.

image description figure B

I would like to know how I can measure air velocity of my classroom in figure A (with one opening) and in figure B (with two openings)?

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@Julien Marrec, Do you have any idea? Thanks in advance

designer4's avatar designer4  ( 2017-12-04 11:22:58 -0600 )edit

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answered 2017-12-06 04:44:48 -0600

updated 2017-12-06 04:47:55 -0600

This is a complicated topic.

You could use AirflowNetwork for this, and use an EnergyManagementSystem:Sensor to connect it to your schedule, computing an average velocity (m/s) from the airflow rates (m3/s) in/out of the Zone. See Air velocity in Airflow-network.

This is going to be perhaps rough though, AirflowNetwork doesn't calculate velocity, just mass/volume air flow rates.

Another solution (the right tool for the job actually...) is to create a CFD model to calculate air velocity around where occupants are supposed to be, and import that back into E+ as a schedule, but that isn't trivial, and it could be way overkill for your needs too.

This other question How is air movement modeled in EnergyPlus and what are typical values? should be of interest too.

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@Julien Marrec, Thank you for your informative response.

designer4's avatar designer4  ( 2017-12-08 11:23:24 -0600 )edit

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Asked: 2017-12-02 14:02:34 -0600

Seen: 1,693 times

Last updated: Dec 06 '17