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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The “assembly 0.67” for a single layer of glass leaves me a little uncertain – I think if you dig deeper you might find the manufacturer may have some helpful context around
that figure. Do they suggest the net impact of the low-e glass, associated framing, trapped air layer, and conductive transfer of the seals in contact with the existing assembly nets an effective U-0.67 for a given/standard window size? If so, your math
looks pretty okay for the assumptions stated (just expand on what that 0.67 means in documenting your approach)! If not or if this isn’t made very clear, you may need to perform a more involved analysis to account for one or more of those items.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">For savings accuracy with existing/historical window retrofits (not always a priority with LEED certification, understandably), I might also be interested (resources permitting)
to test a mockup installation before & after to explore the impact on infiltration reduction in your model. That may more fully capture the cost:benefit ratio if the value of the measure is under active consideration.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46"><img width="726" height="9" style="width:7.5625in;height:.0937in" id="Picture_x0020_1" src="cid:image001.png@01D327FA.71FB7AD0"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
Suite 204<br>
Lenexa, KS 66219<br>
United States</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Morteza Kasmai via Equest-users<br>
<b>Sent:</b> Thursday, September 07, 2017 4:44 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Modifying existing historic windows<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#274E13">Dear all,</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#274E13">I am modeling a historic building and the scope of work is to modify the existing windows by adding a storm window to the existing industrial steel sash windows. The storm window is
one layer Low-E glass with aluminum framing with brake (assembly U-0.67).</span><br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#274E13">Assuming the existing one layer clear glass window has U-value of 5.8, can I assume the assembly R-value of the window system as the total R-values of both of the windows as following,
and would it be acceptable by the LEED reviewer?</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#274E13">Total R-Value: 1/5.8 + 1/0.67 = 0.172 + 1.49 = 1.662<br>
U-Value = 1/1.662 = 0.6</span><span style="font-family:"Tahoma",sans-serif;color:#274E13"><o:p></o:p></span></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#274E13">I would appreciate your help in this matter,<br>
Morteza</span><span style="font-family:"Tahoma",sans-serif;color:#274E13"><o:p></o:p></span></p>
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