<div>Hi Omar,</div>
<div> </div>
<div>this is where the building "science" comes into play. If you are not seeing a noticable difference on your building energy when you change your envelope loads, then this is because your building loads are not driven by the envelope loads (i.e. wall thermal losses, window thermal losses/gains, etc.)</div>
<div> </div>
<div>So, I ran your model and also found that a change in Wall insulation makes a very small difference in energy use. Therefore it prodded me to dig further inot your building loads to see what was driving the loading on the building...A look at the LS-C report (attached) gives us a nice picture...</div>
<div> </div>
<ul>
<li>For your cooling loads-</li>
<li>your wall conduction only makes up 3% of your total cooling load</li>
<li>your window conduction/solar makes up only 14% of your total cooling load</li>
<li>your occupants make up 24% of your cooling load</li>
<li>your lights make up 15% of your cooling load</li>
<li>and then you have a large load attributed to your ground floor surface conduction and equipment to space loads</li></ul>
<div>With such a large occupant load, I'm also guessing that your ventilation load (OA per person) is a HUGE driving factor for your building loads too.</div>
<div> </div>
<div>Based on this info I can conclude to tell you that "you are barking up the wrong tree" with evaluating ECM's for your envelope performance. Any money or efforts put toward a better envelope will yield little, to no savings & payback for your design efforts.</div>
<div> </div>
<div>The great thing about simulation is that it gives us a "picture" of the whole building science of our projects so that we can disect them and understand what is making them "run" so-to-speak and then identify the best ways to improve them based on how they "run."</div>
<div> </div>
<div>Hope this helps,</div>
<div> </div>
<div>Pasha</div>
<div> </div>
<div>Korber Energy Consultants</div>
<p> </p>
<div> </div>
<div class="gmail_quote">On Tue, Jan 18, 2011 at 5:10 AM, Omar Katanani <span dir="ltr"><<a href="mailto:omar@ecoconsulting.net">omar@ecoconsulting.net</a>></span> wrote:<br>
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<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Dear all,</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">It’s been a while!</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I’m having some trouble with my simulations..</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I just realized that, for the files attached, increasing the U-values of the windows & walls dramatically (x10 times) is not increasing my consumption results, but even decreasing the consumption of some categories!</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">This is counter-intuitive, as increasing the U-values should mean that the building is gaining/losing more heat to the external environment, and would thus mean that more energy is required to condition the space!</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I have been changing the U-values of:</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p style="MARGIN-LEFT: 36pt" class="MsoNormal"><font color="navy" size="2" face="Wingdings"><span style="FONT-FAMILY: Wingdings; COLOR: navy; FONT-SIZE: 10pt">Ø<font size="1" face="Times New Roman"><span style="FONT: 7pt 'Times New Roman'"> </span></font></span></font><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">EL1, EL2, EL3, EL4, EL5, and EL6 EWall Construction</span></font></p>
<p style="MARGIN-LEFT: 36pt" class="MsoNormal"><font color="navy" size="2" face="Wingdings"><span style="FONT-FAMILY: Wingdings; COLOR: navy; FONT-SIZE: 10pt">Ø<font size="1" face="Times New Roman"><span style="FONT: 7pt 'Times New Roman'"> </span></font></span></font><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">All the Windows</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Can someone please have a look at the files attached and advise accordingly?</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Many thanks,</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Omar</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">___________________________</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Omar Katanani</span></font><br><font color="navy" size="2" face="Arial"><span style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Sustainable Design Engineer</span></font></p>
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