[Equest-users] ASHRAE 62.1 cfm/person

Eric O'Neill elo at MichaelsEngineering.com
Tue Mar 31 09:41:49 PDT 2009

Wow. You're correct.

The dictionary states:

"The maximum of values resulting from OA-FLOW/AREA, OA-FLOW/PER, and OA-CHANGES will be used unless an over-ride value for OUTSIDE-AIR-FLOW is specified."

I had read this assuming the logical operator "and" meant they were summed (rather than defining a set) and the initial portion of the statement was sloppy engineering English (as it would be the more useful of the two options). I suppose I need to be more aggressive in testing my assumptions, eh?

Thanks for correcting that!


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Min-Hwan Yang
Sent: Tuesday, March 31, 2009 11:08 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] ASHRAE 62.1 cfm/person

I think what Pravin did was correct.

Eric, according to DOE2.2 Dictionary, only the maximum value of oa-flow/area and oa-flow/per will be used, not summed together.  
Please let me know if I am wrong.

Min-Hwan Yang, CPD, LEED AP
Mechanical Engineer | yangm at kjww.com

200 West Jackson Boulevard, Suite 1200 | Chicago, Illinois 60606
312-294-0501 | Direct: 312-356-3750 | Fax: 312-294-0003


I'm attaching a screen capture from a building I modeled (yes, that system setup was heinous and produced terrible results - it wasn't my doing) that shows the OA settings based on 62.1 requirements. 

Let me know if that doesn't simplify your process.


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pravin Wakode
Sent: Tuesday, March 31, 2009 4:50 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] ASHRAE 62.1 cfm/person

Hi All,
        This query is related to HVAC Ventilation used in equest. As per ASHRAE 62.1 Ventilation rates are specified based on per person and per sqft basis for example if I consider a office area the ventilation rates would be 5 cfm/person + 0.06 cfm/sqft.
Equest doesnt allow you to enter the ventilation rate based on sqft basis.
I  am calculating the ventilation rate manully (using per-person + per-sqft basis) and then dividing it by total occupancy and arriving at the cfm/person value which is to be entered in Equest.
Is this procedure correct???
Pravin Wakode

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