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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>James is correct regarding the windows – they should be modeled
using the pre-renovation U-value and SHGC in the baseline case.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The baseline case should not be rotated for existing buildings,
nor should it be rotated if the construction is an addition. The basis of the
rotation requirement for new construction is to reward the project team for
choosing the most efficient orientation for a building and this is not an
option for existing buildings and additions.<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;color:black'>Gregg Liddick,
EIT, LEED<sup>®</sup> AP</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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<p class=MsoNormal><span style='font-size:10.0pt;color:black'>The Epsten Group,
Inc.</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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<p class=MsoNormal><span style='font-size:10.0pt;color:black'>429 Edgewood
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<p class=MsoNormal><span style='font-size:10.0pt;color:black'>Atlanta GA 30312</span><span
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<p class=MsoNormal><span style='font-size:10.0pt;color:black'>Phone: 404-577-0370
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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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James
Hansen<br>
<b>Sent:</b> Thursday, March 11, 2010 9:50 PM<br>
<b>To:</b> Erik Dyrr; omoltay@mimtarch.com<br>
<b>Cc:</b> equest-users@lists.onebuilding.org; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Existing Building LEED Baseline<o:p></o:p></span></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I may be misreading one of your emails, but if you are doing a
building renovation to an existing building, even if you ARE changing out
windows, the baseline model retains the envelope characteristics of the
existing building. You don’t have to bring the baseline windows up to
90.1 standards unless it is a portion of the building that is being added under
the proposed work.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, check the archives – I thought that some GBCI reviews of
projects have required the four orientations even for existing buildings.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:11.0pt;font-family:"Calibri","sans-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:11.0pt;
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<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
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style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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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
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<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>Erik Dyrr<br>
<b>Sent:</b> Thursday, March 11, 2010 8:25 PM<br>
<b>To:</b> omoltay@mimtarch.com<br>
<b>Cc:</b> equest-users@lists.onebuilding.org; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Existing Building LEED Baseline<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>If the windows are existing to remain, then you are correct
that they would be the same in the proposed and baseline. If you change out
windows then the baseline would be min performance per ASHRAE.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>I think your assumption about
not changing the windows by orientation is correct. I am not sure you
even need to do four orientations if the building is existing.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Mon, Feb 22, 2010 at 12:14 PM, <<a
href="mailto:omoltay@mimtarch.com">omoltay@mimtarch.com</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>Dear All,<br>
<br>
Just want to have your opinions about this: Since the building we are<br>
applying for LEED certification is an existing building (and there are no<br>
additions), the building envelope in our baseline model is identical to<br>
the existing conditions in real life. We have interpreted this to also<br>
include the SHGC on the windows and any fixed shading devices on the<br>
windows, so these we have also modeled as existing in real life.<br>
<br>
I assume this would further mean that when we are doing the baseline<br>
simulation in four rotations, we do not need to change anything with the<br>
SHGC's on the windows in each rotation.<br>
<br>
Although according to Appendix G I believe this should be the way (since<br>
the remark involving existing buildings is printed as the last entry in<br>
the table), I still have some doubts as in the LEED NC reference guide<br>
they have only printed that remark for the building envelope involving<br>
opaque surfaces, and the criteria involving windows seems to be<br>
independent of this (on p.270).<br>
<br>
Thanks for any replies,<br>
<br>
Omer Moltay, LEED AP<br>
Mimta Ltd.<br>
<br>
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