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<font class="Apple-style-span" face="Tahoma" size="2" style="font-family: Arial; ">Now I decrease the U-value, and trace the </font><font class="Apple-style-span" size="2" style="font-family: Arial; ">components</font><font class="Apple-style-span" face="Tahoma" size="2"><font class="Apple-style-span" face="Arial">, what happens is that the maximum load (LS-D) tends to decrease, as well as the Building HVAC load (SS-D) tends to decrease as well, which is the normal thing. the </font>abnormal thing is that the space cooling energy use, on the (PS-F)</font><font class="Apple-style-span" face="Tahoma" size="2"><font class="Apple-style-span" face="Arial"> dramatically increase, by decreasing the U-value. I would be so grateful if anyone could help me with a reasonable explanation for that.</font></font><div><font class="Apple-style-span" face="Arial" size="2"><br></font></div><div>Thanks,<br><blockquote class="ecxwebkit-indent-blockquote" style="font-family: Tahoma; font-size: 10pt; border-top-style: none; border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font class="ecxApple-style-span" face="Tahoma">Omar AlRawi</font></b></span></blockquote><blockquote class="ecxwebkit-indent-blockquote" style="font-family: Tahoma; font-size: 10pt; border-top-style: none; border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><font class="ecxApple-style-span" face="Tahoma">Project Engineer,</font></span></blockquote><blockquote class="ecxwebkit-indent-blockquote" style="font-family: Tahoma; font-size: 10pt; border-top-style: none; border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255)"><font class="ecxApple-style-span" face="Tahoma"><font class="ecxApple-style-span" size="2">EA Sustainable Building Consultants</font><br></font></span><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><font class="ecxApple-style-span" face="Tahoma"><a class="ecxparsedLink" href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></font></span></blockquote><hr style="font-family: Tahoma; font-size: 10pt; "><br><br><div style="font-family: Tahoma; font-size: 10pt; "><hr id="stopSpelling">From: o_osama@live.com<br>To: equest-users@lists.onebuilding.org<br>Subject: RE: [Equest-users] U-Value unexpected impact<br>Date: Thu, 13 Oct 2011 21:37:04 +0200<br><br>
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<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 id="ecxFontBreak"></font><br><br><blockquote class="ecxwebkit-indent-blockquote" style="border:none;padding:0px"><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font class="ecxApple-style-span" face="Tahoma">Omar AlRawi</font></b></span></blockquote><blockquote class="ecxwebkit-indent-blockquote" style="border:none;padding:0px"><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font class="ecxApple-style-span" face="Tahoma">Project Engineer,</font></b></span></blockquote><blockquote class="ecxwebkit-indent-blockquote" style="border:none;padding:0px"><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font class="ecxApple-style-span" face="Tahoma">EA Sustainable Building Consultants<br></font></b></span><span class="ecxApple-style-span" style="background-color:rgb(255, 255, 255);font-size:10pt"><b><font class="ecxApple-style-span" face="Tahoma"><a class="ecxparsedLink" href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></font></b></span></blockquote><hr><br><br><div><hr id="ecxstopSpelling">From: akrickx@seriousenergy.com<br>To: chris@greenengineer.com; o_osama@live.com; equest-users@lists.onebuilding.org<br>Date: Thu, 13 Oct 2011 10:39:02 -0700<br>Subject: RE: [Equest-users] U-Value unexpected impact<br><br>
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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 target="_blank"></a>). Low SHGC<a target="_blank"></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 target="_blank"></a> (<0.3), so it doesn't need to sacrifice aesthetics and daylighting<a target="_blank"></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="ecxMsoNormal"><span style="font-family:'Calibri','sans-serif';color:#262f13">Alex Krickx<a target="_blank"></a>, LEED<a target="_blank"></a> AP</span></p>
<p class="ecxMsoNormal"><span style="font-family:'Calibri','sans-serif';color:gray;font-size:11pt">Building Energy Specialist</span></p>
<p class="ecxMsoNormal"><span style="font-family:'Calibri','sans-serif';color:black;font-size:10pt">Serious Energy, Inc.</span></p>
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<p class="ecxMsoNormal"><span style="font-family:'Calibri','sans-serif';color:black;font-size:10pt">(t) 408.541.8124</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>
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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>
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<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>
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<div>--</div>
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<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>
<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>
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<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="ecxApple-style-span" size="2" face="Tahoma">All,</font>
<div><font class="ecxApple-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="ecxApple-style-span" size="2" face="Arial">Thanks for consideration,</font></div>
<div><font class="ecxApple-style-span" size="2" face="Arial"><br>
</font></div>
<div><font class="ecxApple-style-span" size="2" face="Arial"><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif" class="ecxApple-style-span">Omar AlRawi</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif" class="ecxApple-style-span"><br>
</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif" class="ecxApple-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="ecxApple-style-span"><br>
</span><span style="background-color:rgb(255,255,255);font-family:Verdana,Arial,Helvetica,sans-serif" class="ecxApple-style-span"><a class="ecxparsedLink" href="http://www.ea-buildingconsultants.com/" target="_blank">www.ea-buildingconsultants.com</a></span></font></div>
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