[Bldg-sim] 2 pipe system in equest

Nick Caton ncaton at smithboucher.com
Wed Dec 9 07:19:59 PST 2009

Hi Matt,


I'm unsure if observing cooling behavior 12 months out of the year is
something to inherently be concerned about... year-round cooling is a
typical behavior for many buildings I've done in 4-season climates like
our own with significant 'core' zones -not cooling all of the time, but
there's almost always at least some in each month.  The ordinary
heating/cooling distribution can however significantly change in other
climates (a Montana project I just did comes to mind...).  If you're
unsure of what is normal, describe some of the project building
geometries and the climate/location, and often you'll find someone who
can let you know what they're used to observing regarding
heating/cooling behavior through the year.


Perhaps a helpful self-clarifying question for your situation is to
break it down a bit:  You're observing system cooling operation during
all 12 months.  Do you have internal/envelope loads that together call
for cooling every month?  If so, this is not an indication that anything
was modeled incorrectly with your 2-pipe system.  If anything,  you
might have something entered incorrectly regarding the calculation your
internal/envelope loads - on the other hand there may be nothing wrong
with what you're observing per above.


That said, if you feel there is a system issue, do you mean 2-pipe in
the sense of a shared heating/cooling loop (i.e. you can't have unitary
equipment simultaneously in "heating" and "cooling" mode), or 2-pipe in
the sense of only one loop (say, chilled water with electric unitary


PS:  This is just a hunch, but if you have/develop a program-specific
question (equest?), you'll might get faster answers on that program's
mailing list - in any case you'll want to probably mention which program
you're using if you're using the [bldg-sim] list =).








25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 


From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Matt
Sent: Monday, December 07, 2009 7:00 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 2 pipe system in equest


I am simulating a 2 pipe system and I am having trouble with the
schedules.  Has anyone simulated a 2 pipe system?


The problem I am having is that the output is showing space cooling
during all 12 months and heating only 4 months.  


Matt McCalla, P.E. | Olsson Associates

7301 W. 133rd Street, Suite 200 | Overland Park, KS 66213 |
mmccalla at oaconsulting.com

TEL 913.381.1170 | DIR 913.748.2542 | FAX 913.381.1174


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