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<p class=MsoNormal><span style='color:#1F497D'>Thanks for the response
Seth. The entire building is undergoing a renovation (new windows,
insulation, lighting)…and I’m going to keep the existing HVAC
system in the EXISTING portion of the building for my baseline model. I
just don’t know how to treat the NEW portion of my building in the
baseline model. The plant is interconnected, so Item No 2 in Table G3.1
doesn’t apply. I want to include the existing building in the model
(and I have to).<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'>Any other advice on how to properly
set up the baseline HVAC system for a new portion of an existing building if
the proposed chilled water plant is being expanded to accommodate new load but
the existing airside systems in the existing building are NOT being touched?<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'>Common sense would say that my
baseline building also has a new App G chiller to accommodate new load and the
new airside systems are shutoff boxes….but if there is a chance that the
new portion of the building is treated as a standalone 15,000 square foot
addition, packaged RTUs may make the proposed system even more efficient.<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'>Paul, thanks for the email…I’m
going to look thru CIRs and see what I can find. Can’t wait for
LEED v3.0 where this convenient Option goes away.<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'>Thanks again,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'>,
PE, LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><b><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
style='color:black'>1010 N. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span
style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span
style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span
style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-338-5754 (Cell)</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-243-1200 (Office)</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-276-1376 (Fax)</span><span style='font-size:12.0pt;font-family:
"Times New Roman","serif";color:black'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:teal'><a
href="http://www.ghtltd.com/"><span style='font-size:10.0pt'>www.ghtltd.com</span></a></span><span
style='color:#1F497D'><o:p></o:p></span></p>
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<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"'> Seth P. Spangler
[mailto:sspangle@rmf.com] <br>
<b>Sent:</b> Friday, September 04, 2009 9:23 AM<br>
<b>To:</b> James Hansen; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Bldg-sim] Existing building HVAC modeling<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>James,</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>If you are only adding an additional floor – and are not
renovating any portion of the existing 1<sup>st</sup>-4<sup>th</sup> floors
then I would model the 5<sup>th</sup> floor as if it was a new building by itself
according to App. G guidelines. See Table G 3.1 item no. 2 in 90.1-2004</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>If the entire building is undergoing a renovation but the existing
HVAC systems are existing to remain then the building would be modeled to
reflect the existing system types and capacities. Refer to the LEED manual for
these guidelines.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Hope this helps.</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> </span><o:p></o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>Seth Spangler, LEED® AP </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>Project Engineer</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Georgia","serif";
color:blue'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>RMF Engineering, Inc </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>Ph: (843) 971-9639 ext:1497</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>Fax: (843) 971-9641 </span><o:p></o:p></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Georgia","serif";
color:blue'>sspangle@rmf.com</span><o:p></o:p></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>James
Hansen<br>
<b>Sent:</b> Friday, September 04, 2009 9:07 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Existing building HVAC modeling</span><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I’m modeling a building for LEED EAc1 compliance, and
was wondering how you are supposed to model existing building HVAC systems if
you are adding square footage to the building.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Let’s assume you have a 4-story building with a
2-chiller HVAC plant and dual temp boxes. If you were to add a 5<sup>th</sup>
floor to the building, what would your baseline model look like? I know
that the 1<sup>st</sup> four floors would use the existing HVAC system, but
would your new 5<sup>th</sup> floor be treated as a new 15,000 square foot area
with packaged RTUs, or would you add a new chiller to the existing HVAC chilled
water plant, and have that chiller meet all the requirements of App G, and have
shutoff VAV boxes for the 5<sup>th</sup> floor in lieu of dual temp boxes? <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>For reference, under our proposed design, we are doing just
that: adding a frictionless chiller to the plant to make up the extra
load.<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:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif";color:black'>James
Hansen</span></b><b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:black'>, PE, LEED AP</span></b><o:p></o:p></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>1010 N. Glebe Rd, Suite 200</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>Arlington, VA 22201-4749</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-338-5754 (Cell)</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-243-1200 (Office)</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>703-276-1376 (Fax)</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:teal'><a
href="http://www.ghtltd.com/"><span style='font-size:10.0pt'>www.ghtltd.com</span></a></span><o:p></o:p></p>
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