[Bldg-sim] 62.1 Net Occupiable Area

[Alan Jackson]

Gregg

 

There is usually a determination that needs to be made between inactive
storage rooms and active storage rooms. You are correct in that if a
storage room is not intended to be occupied by definition than it does
not require OA. Important also is often small storage rooms may contain
noxious chemicals for cleaning that fall under completely different
criteria.

 

However, with regards to 62.1, the calculation allows rooms that are not
in any way critical spaces (high Evz) to be removed. I would imagine
that if you do decide to provide ventilation to an inactive storage room
it would not be considered your critical space, and therefore is
irrelevant to the calculation. 

 

Alan Jackson, LEED(r) A.P. 

Senior Mechanical Engineer

Buro Happold Consulting Engineers, PC

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Gregg
Liddick
Sent: Thursday, April 09, 2009 9:46 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 62.1 Net Occupiable Area

 

I was determining flow rates for a building when I ran across this
conundrum concerning outdoor air requirements in storage rooms.
Hopefully someone can help me out.

 

Vbz=RpPz + RaAz

Where Az is the "zone floor area: the net occupiable floor area of the
zone" and Ra is the "outdoor airflow rate required per unit area as
determined from Table 6-1".  Mechanical rooms have a value for Ra listed
in Table 6.1.  

 

However, occupiable space is defined under "Definitions" as "an enclosed
space intended for human activities, excluding those spaces intended
primarily for other purposes, such as storage rooms and equipment rooms,
that are only occupied occasionally and for short periods of time".

 

Does this mean that there are no outdoor air flow requirements for
storage rooms?  If so, why is there a value listed for the outdoor
airflow rate required per unit area?

 

Thanks,

Gregg Liddick

 

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