[Bldg-sim] 62.1 Net Occupiable Area

[ashraf khan]

Hello Alan Jackson,

 

Can you please tell me, from which part of ASHRAE 62.1-2004 I need to
consider Ventilation Rates?

 

Also LEED will accept default ventilation rate values?

 

Thanks & Regards, 

 

 

Ashraf Ali Khan, LEED AP

Energy Engineer

MECSD - Dubai

 

P Please consider the environment before printing this email

  _____  

From: Alan Jackson [mailto:Alan.Jackson at burohappold.com] 
Sent: Thursday, April 16, 2009 1:00 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 62.1 Net Occupiable Area

 

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, LEEDR 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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