[Equest-users] Chemistry Laboratory Model

[Bishop, Bill]

Nick,
Are you considering/planning to use heat recovery through system-level
variable flow exhaust system(s)? If so, I don't think it will work if
you model zonal exhaust air flow tracking. (Someone please correct me if
you have determined otherwise.) One way you can model variable hood
exhaust and allow for energy recovery is to use a MIN-AIR-SCH at the
system level to vary the percentage of outside air, in combination with
MIN-FLOW-SCH at the zone level, provided your system is VAV. I would add
total system supply flow and O/A percentage to your hourly reports, so
you can see what the system is doing throughout the year.
Regards,
Bill
 
William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P Please strive to live sustainably.
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vikram
Sami
Sent: Monday, December 07, 2009 1:25 PM
To: Paul Erickson; Kugler, Nicholas; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Chemistry Laboratory Model
 
Oops - hit send before I finished typing.
 
What I meant to say was - that's a really good point Paul. You can set
up your CAV hoods to be 2 steps - for unoccupied and occupied hours too
if that is the situation. We end up doing that on a lot of projects. 
 
Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 
LORD, AECK & SARGENT ARCHITECTURE
 
From: Paul Erickson [mailto:perickson at aeieng.com] 
Sent: Monday, December 07, 2009 1:21 PM
To: Vikram Sami; Kugler, Nicholas; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Chemistry Laboratory Model
 
I'd like to add to Vikram's comment about CAV hoods.  I'd encourage you
to advocate for VAV hoods if the zone's hood CFM is 2ACH or greater.
There has been a lot of progress in recent years in working towards
lower occupied and unoccupied ACH minimums, and 2 ACH may be within
reason for many clients in the coming years.  If VAV hoods are in place,
and the capabilities of the air valves allow, the system would be able
to turn down to a lower ACH minimum and garner your client savings.
 
Paul 
 
Paul Erickson  LEED(r) AP 
Sustainable Practice Leader
 
AEI | AFFILIATED ENGINEERS, INC.  
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1112 | F: 608.238.2614  
perickson at aeieng.com <mailto:perickson at aeieng.com>   |  www.aeieng.com
<http://www.aeieng.com>   
 
 
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vikram
Sami
Sent: Monday, December 07, 2009 11:51 AM
To: Kugler, Nicholas; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Chemistry Laboratory Model
 
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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