[Equest-users] Ventilation

[David Griffin II]

Farid,

I have run into issues in the past with trying to specify two or more different types of airflow (i.e. CFM/Area, CFM, ACH) in the same model. Therefore, I use some BDL scripting which combines my flow rate types into one category similar to the script below which assigns flow rate based on the "C-ACTIVITY-DESC" of the space.

if (#LR("SPACE","C-ACTIVITY-DESC")=="Flor")
then (#LR("SPACE","HEIGHT")*3)/#LR("SPACE","AREA")/60
else
((#LR("SPACE","NUMBER-OF-PEOPLE"))*17)/(#LR("SPACE","AREA"))
endif
/*([Space Height]*[OA ACH])/[Conversion]
/*or
/*([# of people in space]*[Typical CFM/Person for office space])/[Space Area]

Hopefully this helps.

Sincerely,

David Griffin, BEMP
Senior Energy Analyst

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From: Berty, David [mailto:David.Berty at covance.com]
Sent: Friday, January 30, 2015 6:44 AM
To: Sami, Vikram; Farid Pour; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Ventilation

I agree, input airflow rates as ACH instead of cfm/person or any other by changing the units in the wizard (drop-down box option). This is designed for and works well for process-driven ventilation rates.

David Berty, P.E.
Utility/Mechanical Engineer

T: +011.317.467.3294
M: +011.317.448.0482
Covance - Early Development
671 S. Meridian, Greenfield, IN 46140-5006

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Thursday, January 29, 2015 9:38 PM
To: Farid Pour; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Ventilation

It will be high. 16ACH with a 15ft ceiling is massive - that's 4cfm/ft2.

You do have the option of inputting the ventilation rates as ACH and not cfm/person - which is how I would recommend doing it. The reason being - if it's a lab, you are likely ventilating at a rate or schedule that's not tied to the human occupancy schedule.

Vikram Sami
BEMP, LEED BD+C
Associate Partner



ZGF ARCHITECTS LLP
T 206.521.3509 E vikram.sami at zgf.com<mailto:vikram.sami at zgf.com>
925 Fourth Avenue, Suite 2400
Seattle, WA 98104


From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Farid Pour
Sent: Thursday, January 29, 2015 12:52 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Ventilation

Hi
I am trying to model an existing Lab buildng with 16ACH actual ventilation rate. the height of the floor to ceiling is 15ft, the area is 35556 SF and about 100 people are working in the building.

How can I calculate CFM per person. The numbers I am getting is really high and is not even close to ahrae 62.1

Here is what I did for calculation

CFM/person = 16 (ach) x 35556 SF x 15ft / 60 / 100person




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