Omar,<div><br></div><div>When looking at a problem like this, you should really look at how the individual energy uses change, not just the total building energy use.</div><div><br></div><div>For example, if it's Space Cooling energy increased, then it's likely that your worse U-factor glazing was acting as a way for heat to escape the building from high internal loads.</div>
<div><br></div><div>This question becomes much simpler if you know where the energy is going in your building.</div><div><br></div><div>-Robby<br><br><div class="gmail_quote">2011/10/13 Omar Osama <span dir="ltr"><<a href="mailto:o_osama@live.com">o_osama@live.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div dir="ltr">
<font face="Arial"><div><font face="Arial">Thanks so much,</font></div>I do appreciate your reply ,, I shall re-check internal loads, guess I have excessive lighting loads. <br></font><br><br><blockquote style="border:none;padding:0px">
<span style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font face="Tahoma">Omar AlRawi</font></b></span></blockquote><blockquote style="border:none;padding:0px"><span style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font face="Tahoma">Project Engineer,</font></b></span></blockquote>
<blockquote style="border:none;padding:0px"><span style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font face="Tahoma">EA Sustainable B
uilding Consultants<br></font></b></span><span style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font face="Tahoma"><a href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></font></b></span></blockquote>
<hr><br><br><div><hr>From: <a href="mailto:akrickx@seriousenergy.com" target="_blank">akrickx@seriousenergy.com</a><br>To: <a href="mailto:chris@greenengineer.com" target="_blank">chris@greenengineer.com</a>; <a href="mailto:o_osama@live.com" target="_blank">o_osama@live.com</a>; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
Date: Thu, 13 Oct 2011 10:39:02 -0700<br>Subject: RE: [Equest-users] U-Value unexpected impact<div><div></div><div class="h5"><br><br>
<div style="font-family:Tahoma;direction:ltr;color:#000000;font-size:13px">
<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><span style="color:#262f13">Alex Krickx<a></a>, LEED<a></a> AP</span></p>
<p><span style="color:gray;font-size:11pt">Building Energy Specialist</span></p>
<p><span style="color:black;font-size:10pt">Serious Energy, Inc.</span></p>
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<p><span style="color:black;font-size:10pt">(t) <a href="tel:408.541.8124" value="+14085418124" target="_blank">408.541.8124</a></span></p>
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<hr>
<font color="#000000" size="2" face="Tahoma"><b>From:</b> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] On Behalf Of Christopher Schaffner [<a href="mailto:chris@greenengineer.com" target="_blank">chris@greenengineer.com</a>]<br>
<b>Sent:</b> Thursday, October 13, 2011 10:04 AM<br>
<b>To:</b> Omar Osama; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] U-Value unexpected impact<br>
</font><br>
</div>
<div></div>
<div>
<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>
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<div>The Green Engineer, LLP</div>
<div>Sustainable Design Consulting</div>
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<div><a href="mailto:chris@greenengineer.com" target="_blank">chris@greenengineer.com</a></div>
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<div style="border-bottom:medium none;text-align:left;border-left:medium none;padding-bottom:0in;padding-left:0in;padding-right:0in;font-family:Verdana;color:black;font-size:11pt;border-top:#b5c4df 1pt solid;border-right:medium none;padding-top:3pt">
<span style="font-weight:bold">From: </span>Omar Osama <<a href="mailto:o_osama@live.com" target="_blank">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" target="_blank">equest-users@lists.onebuilding.org</a>><br>
<span style="font-weight:bold">Subject: </span>[Equest-users] U-Value unexpected impact<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir="ltr"><font size="2" face="Tahoma">All,</font>
<div><font 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>
<div><font size="2"><br>
</font></div>
<div><font size="2" face="Arial"><br>
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<div><font size="2" face="Arial">Thanks for consideration,</font></div>
<div><font size="2" face="Arial"><br>
</font></div>
<div><font size="2" face="Arial"><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif">Omar AlRawi</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif"><br>
</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif">Project Engineer , EA Sustainable Building Consultants</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif"><br>
</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif"><a href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></span></font></div>
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