[Equest-users] warehouse supplemental supply fans

[Bishop, Bill]

Will,
It sounds like this is unconditioned outside air, so I think a zonal
exhaust fan is what you want. If the exhaust source is "infiltration",
which it probably is, create an exhaust fan schedule that matches the
makeup air unit schedule during the summer and is off during the winter.
Bill
________________________________

From: Will Mak [mailto:wmak at epsteinglobal.com] 
Sent: Monday, January 24, 2011 2:48 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] warehouse supplemental supply fans
 
Bill,
 
Thanks for the feedback.
 
I am attempting to model the fans by adding the additional CFM to the
makeup air unit systems. I am trying to use a schedule to modulate the
total CFM available during different times of the year (hence my
previous question about this before). The more I am thinking about this
though, the more I believe that it's not the correct method to model the
fans. The makeup air units and the supply fans have different fan powers
associated with them. By adding the CFM to the makeup air units, I am
associating the wrong fan power and generating the wrong energy usage
from the fans.
 
I tried using the minimum flow schedule strategy at the zone level to
vary the flow of the system supply fan. However, it only controls the
minimum a space can supply, not the max which is what I'm trying to
control.
 
These fans are called "supply fans" because they bringing in extra air
to meet the minimum air change requirements during summer operation
months called out in the specs. They bringing in a 100% OA as they are
hooded roof type fans. The make up air units are interlocked with these
fans and both operate at the same time. The warehouse area is a heating
only condition. Therefore, during the summer, there is no conditioning
on the air brought in by the make up units and supply fans. Could the
fans be modeled as a process load with these criteria?
 
Appreciate all the help!
 
William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
F: (312) 559-1217
E: wmak at epsteinglobal.com
W: www.epsteinglobal.com <http://www.epsteinglobal.com/> 

* Epstein is a firm believer in sustainability. We ask that you please
consider the environment before printing this e-mail.
 
From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: Monday, January 24, 2011 1:12 PM
To: Will Mak; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] warehouse supplemental supply fans
 
Will,
I'm not sure how you are setting up your supplemental supply fans. You
could try using a minimum flow schedule at the zone level to vary the
flow of the system supply fan. If you are trying to model exhaust fans,
you could also apply an exhaust fan schedule at the zone level. If the
supplemental fans are for circulation only (not supply or exhaust, but
just blowing air around), then model them as a process load.
Regards,
Bill
 
William Bishop, PE, BEMP, 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
<http://www.pathfinder-ea.com/> 
P   Sustainability - the forest AND the trees. P 
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Will
Mak
Sent: Monday, January 24, 2011 12:36 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] warehouse supplemental supply fans
 
A follow up question to this, has anyone been successful in controlling
the max CFM out of a unit with seasonal schedules. For example, a system
can produce 15000 CFM during the winter but 30000 CFM during the summer?
This would help me with the modeling of these supplemental supply fans
that serve the warehouse space as they only operate during the summer.
My strategy would be to schedule this extra CFM during the summer,
though I am still trying to figure out how to properly model the actual
energy usage since the fan power from the make up units differ from the
supply fans...
 
William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
F: (312) 559-1217
E: wmak at epsteinglobal.com
W: www.epsteinglobal.com <http://www.epsteinglobal.com/> 

* Epstein is a firm believer in sustainability. We ask that you please
consider the environment before printing this e-mail.
 
From: Will Mak 
Sent: Wednesday, January 19, 2011 10:43 AM
To: 'equest-users at lists.onebuilding.org'
Subject: warehouse supplemental supply fans
 
Hello all,
 
I am working on an energy model for a warehouse in Dallas, TX. The
design intent of the warehouse area required 1 air change per hour
during the summer. The fans are suppose to operate simultaneously as
makeup units that serve the warehouse. Therefore, 10 make up air units
and 10 supply fans serve the warehouse area to meet this air change
requirement. Modeling the makeup air units can be done by eQuest but I
am curious how I should incorporate the supplement supply fans?
 
Thanks!
 
William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
Architecture
Interiors
Engineering
Construction

600 West Fulton Street
Chicago, Illinois 60661-1259

D: (312) 429-8116
F: (312) 559-1217
E: wmak at epsteinglobal.com
W: www.epsteinglobal.com <http://www.epsteinglobal.com/> 

* Epstein is a firm believer in sustainability. We ask that you please
consider the environment before printing this e-mail.
 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110124/e25a0131/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 2412 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110124/e25a0131/attachment-0002.jpeg>