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<p class="MsoNormal"><span style="color:#1F497D">Yes, eQUEST simulates the exterior air film with different hourly values for each exterior surface, based on wind speed and surface roughness. I ran a custom hourly report to verify this for three random exterior
walls. If you do this for your own model and scroll down to the yearly summary, you can get a sense of the building-wide average annual value. In the case below, the average value is approximately twice the R-0.17 value included in the ASHRAE 90.1 effective
R-values for various exterior constructions. Granted, R-0.35 is small relative to a well-insulated wall, but it can be enough to impact the LV-D reported U-values.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img width="316" height="624" id="Picture_x0020_8" src="cid:image001.png@01CD9190.DD912ED0"></span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com"><span style="text-decoration:none"><img border="0" width="480" height="114" id="_x0000_i1030" src="cid:image002.jpg@01CD9190.DD912ED0" alt="Senior Energy Engineer 28Jun2012"></span></a><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Bruce Easterbrook<br>
<b>Sent:</b> Wednesday, September 12, 2012 12:47 PM<br>
<b>To:</b> Nick Caton<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Building Walls<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:13.5pt">As an adder to this the wind speed also varies with the height of the building. The wind speed for a locations weather file is at a standard reference height and would also be
adjusted for height of the building.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering</span><o:p></o:p></p>
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<p class="MsoNormal">On 12/09/2012 12:22 PM, Nick Caton wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">I can add a probable bit of method to the madness for those concerned:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">The reason exterior air film is not entered as a static property, nor reported lumped in with the constructions’ overall assembly U-values, is because it’s actually a variable property.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">The reference I have handy (Table 5-12, 2001 Fundamentals) lists multiple resistance values for moving air (at various speeds) and still air (for various surface orientations and directions of heat flow).
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I take it as implicit that eQuest/DOE2 models this variable contribution from the exterior air film in consideration of the hourly windspeed data available from the weather file, so presenting any single value
could be misleading. I’ve had to make that clarification a few times for those scrutinizing the construction reports without the eQuest detailed simulation reports reference handy ;).</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hope that helps a bit!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">~Nick</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D"><img border="0" width="119" height="37" id="_x0000_i1025" src="cid:image003.jpg@01CD9190.DD912ED0" alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p>
<p class="MsoNormal"><b> </b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">NICK CATON, P.E.</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900">SENIOR ENGINEER</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">Smith & Boucher Engineers</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">25501 west valley parkway, suite 200</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">olathe, ks 66061</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">direct 913.344.0036</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">fax 913.345.0617</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;color:blue">
</span></u><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<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">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Dahlstrom, Aaron<br>
<b>Sent:</b> Monday, September 10, 2012 4:20 PM<br>
<b>To:</b> Peter Hillermann; <a href="mailto:equest-users@lists.onebuilding.org">
equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Building Walls</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Peter – </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">We’ve noticed the identical issue. Another way of stating it - the sequence of layers input for the baseline and the proposed should EXCLUDE contributions from air film. eQUEST adds the interior air film as
a separate entry under the Layers tab.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="459" height="328" id="_x0000_i1026" src="cid:image004.jpg@01CD9190.DD912ED0"><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">ASHRAE’s regulations for baseline constructions include the contribution of the exterior air film at a specified windspeed. As far as I can tell, this is how the u-value displayed on the LV-D report is calculated.
(Report says “includes exterior air film”).</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">However, we have noticed that the value displayed inside eQUEST as “calculated u-value” does not match the u-value from the LV-D. My theory is that the item shown in eQUEST includes the interior air film but
not the exterior air film. (From Vol 2 dictionary, under CONSTRUCTION:U-VALUE - “For exterior surfaces, equals the overall conductance of the surface including the inside air film but excluding the outside air film.”)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="475" height="341" id="_x0000_i1027" src="cid:image005.jpg@01CD9190.DD912ED0"><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">I’m just learning about this issue, so any wisdom from more experienced folks would be welcome!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Aaron</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="line-height:150%;text-autospace:none"><b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">Aaron Dahlstrom , PE, LEED® AP</span></b><o:p></o:p></p>
<p class="MsoNormal" style="line-height:150%;text-autospace:none"><b><span style="font-family:"AvantGarde Bk BT ;color:#17365D","serif"">In P</span></b><b><span style="font-family:"AvantGarde Bk BT ;color:#619428","serif"">o</span></b><b><span style="font-family:"AvantGarde Bk BT ;color:#17365D","serif"">sse</span></b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">
– </span><span style="font-size:8.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">A subsidiary of</span><b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:#CC0000">AKF</span></b><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">|
1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 </span><o:p></o:p></p>
<p class="MsoNormal" style="line-height:150%;text-autospace:none"><span style="font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray">d: 215-282-6753| m: | In Posse: 215-282-6800| AKF: 215-735-7290</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray">e:
<a href="mailto:ADahlstrom@in-posse.com">ADahlstrom@in-posse.com</a> | in posse web:
<a href="http://www.in-posse.com/">www.in-posse.com</a> | akf web: <a href="http://www.akfgroup.com/">
www.akfgroup.com</a></span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
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<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">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Peter Hillermann<br>
<b>Sent:</b> Monday, September 10, 2012 2:02 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Building Walls</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">To All:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">A general piece of information I got from our engineer when we had done the energy model for LEED and something to look out for. He let me know that in the baseline for wall construction to make sure you add in the air film (inside and
out) otherwise LEED has an issue with your submission.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Our exact comment was this:<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">The Baseline Case roof and exterior wall U-values reported in Table 1.4.1A (U-0.048 and U-0.065, respectively) are</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">inconsistent with the U-values reported in the LV-D report (U-0.054 and U-0.063, respectively). Please ensure consistency</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif"">across construction drawings, software summaries, and the EAp2 Template.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal">Hope it helps.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I also don’t know if anyone has this summarized, because I used the baseline walls from this forum that someone had posted and that was the response.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">PS: Thank you to this forum, we ended up getting LEED Certified.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt">PETER HILLERMANN</span></b><o:p></o:p></p>
<p class="MsoNormal"><span lang="DE" style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="DE" style="font-size:8.0pt"><a href="mailto:peterh@westallarchitects.com">peterh@westallarchitects.com</a></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="DE" style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="line-height:75%"><b><span lang="DE" style="font-size:14.0pt;line-height:75%">westall</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:4.0pt;line-height:75%"><b><span style="font-size:14.0pt;line-height:75%">architects</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt">3404 pierce drive</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt">chamblee, georgia 30341</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt">o 770.458.4113</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt">c 678.898.2936</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:8.0pt">westallarchitects.com</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><img border="0" width="160" height="87" id="Picture_x0020_2" src="cid:image006.jpg@01CD9190.DD912ED0" alt="Description: Description: Description: e-signature"><img border="0" width="92" height="90" id="Picture_x0020_1" src="cid:image007.gif@01CD9190.DD912ED0" alt="Description: Description: Description: USGBC-Logo"></span><o:p></o:p></p>
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