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<p class=MsoNormal><span style='color:#1F497D'>Hi Matt,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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 coils)?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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 =).</span><o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37
id="Picture_x0020_1" src="cid:image001.jpg@01CA78AD.D69A9250"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Matt
McCalla<br>
<b>Sent:</b> Monday, December 07, 2009 7:00 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] 2 pipe system in equest<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am simulating a 2 pipe system and I am having trouble with
the schedules. Has anyone simulated a 2 pipe system?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The problem I am having is that the output is showing space
cooling during all 12 months and heating only 4 months. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Matt
McCalla, P.E. | Olsson Associates</span><span style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>7301
W. 133rd Street, Suite 200 | Overland Park, KS 66213 |
mmccalla@oaconsulting.com</span><span style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>TEL
913.381.1170 | DIR 913.748.2542 | FAX 913.381.1174</span><span
style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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