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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Mark,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>This is a fairly common result, and there
can be several reasons. The lower SC, even on the north side, means less
beneficial solar gain that would otherwise offset some of the reheat. Another
thing that could be going on is that there is less beneficial free cooling with
the high performance glazing during mild outdoor conditions (due to the lower
U-factor). Therefore, if you have supply air temperature reset, you may end up
with lower supply air temperatures due to higher cooling loads. That leads to
more reheat required in the zones that are at minimum airflow. As Mitch
mentioned in a separate email, it can be useful to evaluate several options
with different combinations of SC and U-factor to find the optimal combination.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Erik Kolderup<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Architectural Energy Corporation<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> bldg-sim@gard.com
[mailto:bldg-sim@gard.com] <b><span style='font-weight:bold'>On Behalf Of </span></b>Zoeteman,
Mark R.<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, December 15, 2005
12:53 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [bldg-sim] High
Performance Glazing</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
am modeling high performance glazing with U=0.14, SC=0.35 and comparing to
typical 1" thick insulating low-e glass with U=0.33, SC=0.76.
Climate is midwest US and 86% of the glass is facing north. The north wall is
basically all glass and spandrel. Heating is suppied from district steam
supply.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Results
show increased steam energy consumption from February through September with
high performance glazing and less for remaining winter months. HVAC system is
VAV with hot water reheat coils.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Overall
annual steam energy consumption reduction is very small. I expected to see
significant heating energy savings due to increased perimeter R-value. Has
anyone modeled high performance glazing and seen similar results? </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Mark
Zoeteman</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>FTC&H,
Inc.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>(616)
464-3739</span></font> <br>
<u><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>mrzoeteman@ftch.com</span></font></u>
<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>==================<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>You received this e-mail because you are subscribed <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>from this mailing list send a blank message to <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></span></font></pre></div>
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