Sorry that I wasn't more clear, but I am questioning the major decrease in energy performance between the baseline and the ALT 1 of 8%. The U-value difference is about 0.003, so I would expect a much smaller decrease around 0-0.5%. THe problem I am having is with the exterior only application of ALT 1 vs exterior and cavity fill insulation in the baseline.<br>
<div><br></div><div>ie. 90.1 Baseline is R13 fill + R7.5 continuous insulation</div><div>ALT 1 is R0 fill + R12 continuous insulation. (very common installation)</div><div><br></div><div>Thanks,</div><span class="HOEnZb"><font color="#888888"><div>
nic</div></font></span><div class="HOEnZb"><div class="h5"><br>
<div class="gmail_quote">On Wed, Jan 25, 2012 at 3:21 PM, Nikola Kravik <span dir="ltr"><<a href="mailto:NKravik@willdan.com" target="_blank">NKravik@willdan.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I guess your “issue” or question relates to the amount of savings so you’re surprised how little savings you get increasing your wall insulation thickness?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Don’t be surprised since you mentioned is internal load dominated plus there are other factors like climate, orientation and wall area that play a role so without the building description I don’t see any issue with the results you’re showing.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best,n</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal" style="line-height:10.0pt"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">Nikola Kravik, LEED AP </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1f497d"><img width="28" height="33" src="cid:image001.gif@01CCDB64.42A31BA0" alt="Description: cid:image001.gif@01CB9AE0.30118F00"></span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:gray"><br>
Project Engineer<br><br><b>Willdan Energy Solutions</b></span></p><p class="MsoNormal" style="line-height:10.0pt"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:gray">11875 Dublin Boulevard, Suite A-201<br>
Dublin, California 94568<br>T. 925.556.2600 ext. 1228</span></p><p class="MsoNormal" style="line-height:10.0pt"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:gray">C. 925.719.5883<br>
F. 925.556.1444</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="mailto:nkravik@willdan.com" target="_blank"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">nkravik@willdan.com</span></a><br>
<a href="http://www.willdan.com/energy" target="_blank"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">www.willdan.com/energy</span></a></span></p><p class="MsoNormal" style="line-height:10.0pt">
<span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:gray"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray"><img border="0" width="237" height="39" src="cid:image002.jpg@01CCDB64.42A31BA0" alt="WD_tagend_300rgb"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal">
<b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>nic<br>
<b>Sent:</b> Wednesday, January 25, 2012 1:01 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Exterior insulation vs Exterior with Cavity insulation</span></p>
</div><div><div><p class="MsoNormal"> </p><p class="MsoNormal" style="margin-bottom:12.0pt">I am attempting to establish a few alternatives compared to an ASHRAE 90.1 Wall construction. This much seems pretty straightforward with the only change between alternatives being a different construction applied to the exterior above grade walls. All alternatives are modeled as delayed and with layered materials. The wall from outside to inside is stucco(finish) R0.08 + Cont. Insulation R-VARIES + Ext sheathing R0.56 + Framing/Insulation R-VARIES* + Int. Sheating R0.56 (air films do not change, infiltration does not change, etc.)<br>
<br>*framing 16" Mtl OC taken into account<br><br><<< I should mention the building is very much internal load dominant as an education building with a lot of laboratory space >>></p><div><p class="MsoNormal">
The problem described below has been input into eQuest using material properties for all continuous insulation and a representative R-value for framing/insulation.</p></div><div><p class="MsoNormal"> </p></div><p class="MsoNormal">
<br>BASELINE - 90.1 - R6* + 7.5 ci na<br><br>ALT1 - only ext insulation R0.9 + 12 ci -8% savings (% energy under EUI - kBtu/sf/yr) <br><br>ALT2 - improved ext insulation R6* + 12 ci +1% savings<br><br>ALT3 - improved cavity insulation R7.1* + 7.5 ci +1% savings<br>
<br>ALT4 - all insulation improved R7.1* + 12 ci +2% savings</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">I guess the question really is; does the issue lie within the vav systems or the envelope or both?</p>
</div><div><p class="MsoNormal"> </p></div><p class="MsoNormal">As a novice, I greatly appreciate any help.</p></div></div></div></div></blockquote></div><br>
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