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<p class=MsoNormal><span style='color:#1F497D'>Hi Brett,<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'>As I was going through a
research document, I found another answer to your question.<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'><a
href="http://gaia.lbl.gov/btech/papers/59190.pdf">http://gaia.lbl.gov/btech/papers/59190.pdf</a>
<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'>Figure 5 on page 12 shows how
different performing windows impact energy use. Although this graph is for
residential buildings, it shows that improving U-factor only saves energy when reducing
SHGC. I would guess that for commercial buildings (typically higher internal
loads than residential) this effect will be even greater. Once the model is
working, try looking into a low-SHGC solution.<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'>Hope this helps. <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'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Alex</span><o:p></o:p></p>
<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>Brett
M. West<br>
<b>Sent:</b> Monday, November 08, 2010 1:38 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Window Comparison<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt'>I am doing a model for a two
story office building with the windows making up approximately 30% of the
building’s exterior. My goal is to find what type of energy savings the
owner can expect by replacing all the existing single pane windows with double
pane, low e windows. When I change the window type to a double pane low-e
window I am seeing savings that are very small, around 3% of the total building
kWh.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>For reference, the buildings
HVAC system consists of two air handlers (one per floor) ducted to a VAV system
with hot water reheat. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Has anyone else tried to do
this type of comparison and if so what type of energy savings did you find? I
have attached my model pd2 and inp files for reference. Thanks in advance for
any information.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>Brett West<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt'>RMF Engineering, Inc</span><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Ph:
843.971.9639<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>bwest@rmf.com
<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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