[Trace-users] High Gas Usage In March

Ben Hollon bhollon at antella-inc.com
Wed Nov 19 14:05:20 PST 2014

I am working to align an energy model with an existing 7-story office
building. The building has two air handlers, one serves the exterior of the
building and one serves the interior. Both are constant volume units and
treat their associated portion of the building as a single zone. Very odd
system, but very old building.

I had both units as single zone systems but was having a difficult time
aligning the gas usage for the exterior AHU. Turns out the AHU has a hot
deck and a cold deck and mixes down to serve the whole building, and
controls are very limited, requiring the heating deck to always maintain
110 degF if the exterior is calling for heating. This 110 degF is mixed
down with the cold deck to 85-90, essentially wasting the gas it took to
get it up to 110… a very easy ECM. So I switched the system type to dual
duct and my gas usage started aligning perfectly, with the exception of

My schedules are all Jan-Dec since it’s an office building, I haven’t
manipulated the default weather file for Kansas City, Missouri, and my only
other gas load is domestic hot water which has the ‘Available 100%’
schedule. So I’m at a loss as to why my March gas usage is so high, pretty
much equal with January usage, which is twice what the building is actually
using in March. The gas consumption curve which bottoms out in the summer
and peaks in the winter looks like every other curve I’ve seen with the
exception of March.

I’ve poured through my inputs and the output reports and can’t find
anything. Has anyone ever experienced this, or know the dumb input I
probably screwed up?


[image: cid:image003.png at 01CDAB78.6524ACE0]

*Ben Hollon*


 Antella Consulting Engineers, inc.

1600 Genessee, Suite 260 • Kansas City, MO 64102 • Tele: (816) 421-0950 • Fax: 
(816) 249-2439 • www.antella-inc.com


DISCLAIMER: The information contained in this electronic communication, as 
well as in any attachments, is privileged and confidential and intended 
solely for use by the addressee(s). Any other use, dissemination, or 
copying of this electronic communication is strictly prohibited and is an 
interference with Antella Consulting Engineers, inc. confidential business 
relationships. If you received this communication in error, please notify 
me immediately and permanently delete the original and any electronic or 
printed copies of this electronic communication. 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20141119/8c50159b/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 17316 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20141119/8c50159b/attachment.png>

More information about the Trace-users mailing list