[Bldg-sim] Stack effect question

[Bass Abushakra via Bldg-sim]

The natural pressure level (NPL) is roughly mid-height of the building.
What plays a role in NPL deviating from mid-height are mainly the openings in the envelope.  Naturally, with more openings at the bottom of the building (entrance, backdoors, garage ramps, loading decks, etc.) the NPL drops down (half-a-floor, or more).

Thanks.

Bass

Bass Abushakra, PhD

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President and Principal Engineer
Datadigm, LLC
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Email: bass at datadigm.us<mailto:bass at datadigm.us>
Tel: 414-517-4183



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Tel: 414-288-5893



From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami via Bldg-sim
Sent: Wednesday, December 7, 2016 11:41 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Stack effect question

This might be a basic question.

Does the internal temperature of a stack affect the neutral pressure height? Would adding heat into a stack cause the neutral pressure point to rise? Instinctively I think it does, but I cannot find the equation for this.

Appreciate any feedback

Thanks

Vikram Sami, AIA, BEMP, LEED AP BD+C
Director of Building Performance

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