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<div>Hi Omar,</div>
<div><font size="2" face="tahoma"></font> </div>
<div>Another thing to check is that you are modeling a glass with a low-Solar Heat Gain Coefficient (SHGC<a></a>). Low SHGC<a></a> glasses and glass-units are best for situations where there is no need for passive heating (hot climates and internal load-dominated
buildings).</div>
<div><font size="2" face="tahoma"></font> </div>
<div><font size="2" face="tahoma">You can still maintain high VT (>0.5) with low SHGC<a></a> (<0.3), so it doesn't need to sacrifice aesthetics and daylighting<a></a> options.</font></div>
<div> </div>
<div>Great point on the internal loads Chris.</div>
<div><font size="2" face="tahoma"></font> </div>
<div><font size="2" face="tahoma">Cheers,</font></div>
<div><font size="2" face="tahoma">Alex</font></div>
<div><font size="2" face="tahoma"></font> </div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #262f13">Alex Krickx<a></a>, LEED<a></a> AP</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: gray; FONT-SIZE: 11pt">Building Energy Specialist</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 10pt">Serious Energy, Inc.</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 10pt">1250 Elko Dr, Sunnyvale, CA 94089</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 10pt">(t) 408.541.8124</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 10pt"><a><span style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: black; FONT-SIZE: 10pt">akrickx@seriousenergy.com</span></a></span></p>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> equest-users-bounces@lists.onebuilding.org [equest-users-bounces@lists.onebuilding.org] On Behalf Of Christopher Schaffner [chris@greenengineer.com]<br>
<b>Sent:</b> Thursday, October 13, 2011 10:04 AM<br>
<b>To:</b> Omar Osama; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] U-Value unexpected impact<br>
</font><br>
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<div>In mild weather, with high internal heat gains, the losses through the glazing reduce the cooling load. In this situation, increasing the performance of the glass will cause increased energy consumption. </div>
<div><br>
</div>
<div>This counterintuitive result is often the result of an overestimation of internal heat gains. You should perform a reality check on your internal heat gains, before you determine if this result is correct. </div>
<div><br>
</div>
<div>
<div>--</div>
<div><br>
</div>
<div>Chris Schaffner, PE</div>
<div>LEED Fellow</div>
<div>Founder and Principal</div>
<div><br>
</div>
<div>The Green Engineer, LLP</div>
<div>Sustainable Design Consulting</div>
<div>50 Beharrell Street</div>
<div>Concord, MA 01742</div>
<div>T: 978.369.8978</div>
<div>M:978.844.1464</div>
<div>chris@greenengineer.com</div>
<div>www.greenengineer.com</div>
<div><br>
</div>
<div>The Green Engineer, LLP is a Certified B Corporation</div>
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<span style="FONT-WEIGHT: bold">From: </span>Omar Osama <<a href="mailto:o_osama@live.com">o_osama@live.com</a>><br>
<span style="FONT-WEIGHT: bold">Date: </span>Thu, 13 Oct 2011 16:07:13 +0200<br>
<span style="FONT-WEIGHT: bold">To: </span><<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>
<span style="FONT-WEIGHT: bold">Subject: </span>[Equest-users] U-Value unexpected impact<br>
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<div dir="ltr"><font class="Apple-style-span" size="2" face="Tahoma">All,</font>
<div><font class="Apple-style-span" size="2" face="Tahoma"> I'am modelling a mid-rise, curtain wall, office building in Egypt (hot humid climate 2a). while I do decrease the glazing's U-value, below 0.5, the energy consumption tends to increase. does this
issue have a reality related explanation, is it a problem in my file, or is it a software bug issue? </font></div>
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<div><font class="Apple-style-span" size="2" face="Arial">Thanks for consideration,</font></div>
<div><font class="Apple-style-span" size="2" face="Arial"><br>
</font></div>
<div><font class="Apple-style-span" size="2" face="Arial"><span style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif" class="Apple-style-span">Omar AlRawi</span><span style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif" class="Apple-style-span"><br>
</span><span style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif" class="Apple-style-span">Project Engineer , EA Sustainable Building Consultants</span><span style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif" class="Apple-style-span"><br>
</span><span style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Verdana,Arial,Helvetica,sans-serif" class="Apple-style-span"><a class="parsedLink" href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></span></font></div>
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