[Equest-users] NINJA-SPAM: Lab Exhaust Hoods

[Steven Savich]

Sam, 

 

Are you going to be modeling constant or variable flow hoods, and will your
zones w/fume hoods be served by dedicated single zone systems or by a single
system?  More specifics about the HVAC system(s) would be helpful.

 

Agree on Vikram's points, except about assigning the exhaust flow under the
airflow tab; it should be added in the outdoor air tab.  Let me add that,
from eQuest 3.61e & later, you have an option to specify how the exhaust
flow tracks/is coordinated with supply flow.  At the zone level you can
specify an exhaust flow as well as the tracking control.  Have a look in the
help files under AIRFLOW-TRACKING.  I believe this function was added
specifically to address fume hood modeling.

 

Steven

 

Steven Savich, LEED AP

Systems West Engineers

411 High Street

Eugene, OR  97401-2427

(541) 342-7210

(541) 342-7220 (fax)

  _____  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Wednesday, February 18, 2009 1:32 PM
To: Sam Alpert; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] NINJA-SPAM: Lab Exhaust Hoods

 

It depends, but the best way would be to model it as exhaust air in the zone
(air side HVAC). If you are trying to assign a schedule to it, it gets
trickier. You probably want to assign it as a design flow then (under the
airflow tab) and assign a flow schedule to it. You'll need to specify 100%
OA at the system level in this case.  

 

I'd be interested in seeing if there's better ways to do this out there.

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 
Responsive Design * Technological Expertise * Exceptional Service 
Please visit our new website |  <file:///\\www.lordaecksargent.com\>
www.lordaecksargent.com

P Think GREEN before you print.

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sam Alpert
Sent: Wednesday, February 18, 2009 2:05 PM
To: equest-users at lists.onebuilding.org
Subject: NINJA-SPAM:[Equest-users] Lab Exhaust Hoods

 

Hello eQuest user-list,

 

I am wondering how to model laboratory exhaust hoods.

 

Please advise.

 

Thanks,

Sam



 <http://www.gdsassociates.com/> www.gdsassociates.com

GDS Associates, Inc.
Engineers and Consultants

SAMUEL M. ALPERT, CEM
Engineer

1181 Elm Street, Suite 205
Manchester, NH 03101
phone 603.656.0336
fax 603.656.0301
cell 603-296-5308
Sam.Alpert at gdsassociates.com

 

 

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