[Equest-users] (eQuest Users) Summer heating in a VAV system

[Bishop, Bill]

Scott,
 
I would apply different thermostat schedules to some of your spaces. You
have three mechanical spaces, two bathrooms and a work space out of 13
total spaces on the system. These spaces are probably not intended to be
heated and cooled within the same narrow range as the offices etc. Also,
you have entered the supply cfm for the system but not for the zones. It
would not take much effort to add design cfm to the zones to see how it
changes things. I was going to suggest that you make your bathroom walls
"air walls" since that is where you are exhausting from - air is being
transferred from adjacent spaces. However, you already have all your
interior walls set to air walls. I'm guessing most of those should be
changed to "standard".
 
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
P Sustainability - less is more.
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol
Gardner
Sent: Wednesday, August 18, 2010 10:53 AM
To: Tomlinson, Scott
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] (eQuest Users) Summer heating in a VAV
system
 
Hi Scott,

I would look through the load part of your model for the answer. For
instance I notice that many of you spaces have no equipment loads,
including your mechanical room (!?!). Put a small w/sf in each space.
Your occupancy loads are also small compared to what other building
types have. Also, look at your schedules to see if you agree with the
default. After that if you are still having a problem, let us know.

Best,

Carol
On Wed, Aug 18, 2010 at 7:37 AM, Tomlinson, Scott <stomlinson at smma.com>
wrote:
Folks,
 
I am having issues with VAV systems in eQuest.  This is a reoccurring
problem for me.  I am getting large amounts of heating during the
summer.  I suspect this is due to reheat at the VAV terminals.  I've
tried everything I can think of to eliminate this.  I have lowered my
minimum VAV flow rates, lowered my summer heating setpoint temp to 55,
locked out my boilers based on higher outside air temps.  All these
changes eliminated my summer heating. But they also shot my unmet
heating hours way up.  Does anyone have any other suggestions on how to
correct this?
 
Thank you,
__________________________________________
Scott Tomlinson, PE, LEED-AP
Mechanical
Symmes Maini & McKee Associates, Inc.
1000 Massachusetts Avenue, Cambridge, MA 02138
t: 617.520.9438
 
 
f: 617.354.5758
stomlinson at smma.com
www.smma.com <http://www.smma.com/> 
 
 

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-- 
Carol Gardner PE
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