[Bldg-sim] Negative pressure for EQ cr 5

[James V Dirkes II, PE]

Personal opinion:

.         5 Pa is difficult to (accurately) measure

.         1 Pa is impossible outside of a lab

 

I don't know what they were thinking when making these requirements, since
they're not too clear, but I suspect that if you demonstrate .5cfm / sq.ft.
and no recirculation you'll be OK.

 



 

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Deepa
Sent: Wednesday, October 06, 2010 2:59 PM
To: Bldg-Sim
Subject: [Bldg-sim] Negative pressure for EQ cr 5

 

Hello all,

 

One of the requirements for EQ Credit 5 is to prove that the areas such as
the janitor's closet need to be negatively pressurized to a minimum of 5Pa
when doors are closed and 1Pa when doors are open. Generally, in mechanical
drawings, the cfm values are mentioned for exhaust fans. 

 

I wanted some insight as to how this pressure difference information can be
obtained for both cases. Is there a straightforward calculation? 

 

 

Thanks,

Deepa

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