[Equest-users] Chemistry Laboratory Model

[Vikram Sami]

Nick,

The way I would approach this:

 

1.       Establish what the minimum flow rate for each hood is (as a
percentage of maximum). Most chemical hoods have a minimum required cfm
rate even when closed that flows through the reagent shelf below to keep
it ventilated. 

2.       Establish a diversity schedule for the hoods

3.       In eQUEST v3.63 and above you can specify airflow tracking for
exhaust air streams on a thermal zone basis - there's a good help
section on what the different tracking options do. It's my understanding
that this was put in specifically for fumehoods. Set your max flow rate
here and set up a fraction schedule to determine flow rate. 

 

One thing you might want to check up on is the fumehood density. If the
lab is very fumehood intensive, then it might make sense to go with the
VAV hoods. However, if it's a ventilation driven lab (as opposed to an
exhaust driven lab), you might as well have constant volume hoods. 

 

For instance, if your EHS requires 6 air changes per hour in a 10 foot
high 10,000ft2 lab, your supply cfm = 10,000 cfm. Lets say you have 10 x
6' wide fumehoods with 800cfm at max sash height (18"). That would give
you 8,000 cfm. So having VAV controls on the hoods is not going to
reduce your airflow unless you ramp down to below 5ACH during unoccupied
hours. 

 

Hope this helps

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

LORD, AECK & SARGENT ARCHITECTURE



 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kugler,
Nicholas
Sent: Monday, December 07, 2009 7:42 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Chemistry Laboratory Model

 

I am about to begin an energy model for a large university lab project
that includes about 150 VAV chemical fume hoods. The building systems
will include a true VAV exhaust system, not a bypass system. Please
advise how this can be modeled using eQuest. Thank you in advance.

 

Nick Kugler, LEED AP

Mechanical Engineering

 

TLC Engineering for Architecture
Your Architecture 2030 Partner

 

874 Dixon Boulevard

Cocoa, FL 32922

 

phone: 

321-636-0274

fax: 

321-639-8986

website: 

www.tlc-engineers.com <http://www.tlc-engineers.com> 

 

  <http://www.tlc-engineers.com/> 

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