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<p class="MsoNormal"><span style="color:#1F497D">Nick, I have a follow-up question. How does one define the "thermal ties" between plenum and conditioned space zones?
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Wednesday, May 30, 2012 7:03 PM<br>
<b>To:</b> Pasgar, Arash; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] proposed & baseline design energy use<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Arash,<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 don’t often do pictorial breakdowns like this, but this seems a particularly well-suited example to illustrate some common investigative procedures.<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">First observing your unmet heating hours are in check, I see a uniform rate of $0.776500/therm, then turning to your consumption reports after simulating:
<img width="840" height="301" id="Picture_x0020_12" src="cid:image004.png@01CD3F11.74A88ED0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="853" height="271" id="Picture_x0020_13" src="cid:image005.png@01CD3F11.74A88ED0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Annual gas consumption here is 2.49 MBtu. The simple math with the above rate works out to $19.33/yr by hand (acknowledging there’s some rounding with that 2.49 figure, this checks out).<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">The rate seems a bit cheap to me, but then hey it’s Texas. Don’t mess with Texas =)! If there’s a problem to fix, I expect it’s with consumptions.<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">Your SS-R reports are a clue: These systems (1) do not run often, and (2) when they do, the load rings in well below the specified capacity (between zero and 10% mostly).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="1125" height="247" id="Picture_x0020_14" src="cid:image006.png@01CD3F11.74A88ED0"><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">There may be some disconnect to resolve between the load calcs used to size your equipment and the loads being addressed in the energy model. Resolving such a disconnect may correct the amount of heating being
done and thus bring your consumptions up. I suggest reviewing your constructions and other inputs affecting your model’s heating loads for those zones (ex: internals like lighting, occupancies, and associated scheduling) against the load calcs. Perspective
check: keep an open mind as the “problem” may not be with the model – load calcs can make mistakes.<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">Before turning your attentions to the load calcs however, consider whether all the associated envelope heating loads are even being seen by your gas heating systems. Looking to your geometries, I notice you
have both plenum and under-roof zones defined. Closely review how those zones are tied (or not) thermally to the zones with the thermostats. Also consider whether the under-roof zone – which aggregates all the roof skin loads - (1) should not be broken up,
(2) should be assigned to electric heating systems, and (3) is itself conditioned.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="991" height="203" id="Picture_x0020_16" src="cid:image007.png@01CD3F11.74A88ED0"><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">Playing around a bit with thermal ties and zone assignments as suggested, I arrived at a ~30 MBtu annual draw, bumping the annual gas costs into the hundreds... This may or may not be in the right ballpark for
where you’re headed, but illustrates the potential effects (>10x here) when your loads do not get to the correct thermostats:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="612" height="513" id="Picture_x0020_5" src="cid:image008.png@01CD3F11.74A88ED0"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Nick<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><img width="119" height="37" id="_x0000_i1030" src="cid:image009.jpg@01CD3F11.74A88ED0" 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-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">Smith & Boucher Engineers</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, suite 200<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"><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>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<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"">
<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
<a href="mailto:[mailto:equest-users-bounces@lists.onebuilding.org]">[mailto:equest-users-bounces@lists.onebuilding.org]</a>
<b>On Behalf Of </b>Pasgar, Arash<br>
<b>Sent:</b> Wednesday, May 30, 2012 1:18 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] proposed & baseline design energy use<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In my model, I have to storage rooms with no cooling and just heating. One of them is gas infra radiant heater and the other one gas unit heater.<o:p></o:p></p>
<p class="MsoNormal">I modeled both of them as a unit heater (system type), 0 design kw/cfm, Furnace (heat source) and entered heating capacity (-400000 btu/h for infra and -120000 for UH).<o:p></o:p></p>
<p class="MsoNormal">When I run the LEED results (CSV), my gas cost is about $22/y.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I do not know, how to fix this problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance for your help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Verdana","sans-serif";color:#404040">Arash Pasgar<br>
</span></b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040">Mechanical Designer</span><span style="font-family:"Verdana","sans-serif";color:#404040"><br>
</span><span style="color:#404040"><br>
</span><span style="color:black"><img border="0" width="264" height="53" id="Picture_x0020_1" src="cid:image010.jpg@01CD3F11.74A88ED0" alt="Description: Description: Description: Description: Description: Description: image001"></span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#404040"><br>
<br>
v. 210.546.0200 | <a href="http://www.dbrinc.com">www.dbrinc.com</a></span><span style="color:#404040"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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