The house was built in 1969 and has original fiberglass insulation in the walls, original single pane aluminum frame windows and has had R-19 blown cellulose insulation installed in the attic in 2004 before I bought the house. That's significantly less insulation than R-38. I'm trying to find my most cost efficient energy improvement (aside from replacing the roof with white shingle, already on the list for 2011).<br>
<a href="mailto:equest-users@lists.onebuilding.org" target="_blank"></a><br><div class="gmail_quote">On Thu, Apr 15, 2010 at 12:00 PM, Ramirez, Bob <span dir="ltr"><<a href="mailto:Bob.Ramirez@itron.com">Bob.Ramirez@itron.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">If you already have a lot of ceiling insulation (R-30, R-38)
then the radiant barrier will indeed have minimal impact. Just like adding
insulation, there are diminishing returns. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: rgb(31, 73, 125);">Bob Ramírez, P.E.</span></i><span style="font-size: 10pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: black;">Itron Consulting & Analysis Group > <a href="http://www.itron.com/pages/products_category.asp?id=itr_000796.xml" title="http://www.itron.com/pages/products_category.asp?id=itr_000796.xml" target="_blank"><span style="color: blue;">http://www.itron.com/consulting</span></a></span><span style="font-size: 10pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: rgb(31, 73, 125);">11236 El Camino Real > San Diego, CA 92130</span></i><span style="font-size: 10pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: teal;">Main: 858-724-2620</span></i><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span><i><span style="font-size: 10pt; color: teal;">Direct: 858-724-2650
Cell: 858-692-5676</span></i><span style="font-size: 10pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: rgb(31, 73, 125);">E-mail > <a href="mailto:Bob.Ramirez@Itron.com" target="_blank"><span style="color: blue;">Bob.Ramirez@Itron.com</span></a></span></i><i><span style="font-size: 10pt; color: rgb(31, 73, 125);"></span></i></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<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>Graham
Sattler<br>
<b>Sent:</b> Thursday, April 15, 2010 9:46 AM<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] eQuest and Radiant Barriers</span></p>
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<p class="MsoNormal">I am new to eQuest and spent a good part of yesterday
modelling up my house in Houston. I have gotten within 10% of my current
energy usage with my current model and was looking to start analyzing proposed
improvements and their energy consumption impacts. My first to try was a
radiant barrier in the attic and using the dropdown menus in the Schematic
Wizard found it had very close to no effect at all on my projected energy
consumption. I ran into a 2007 paper titled "Comparative Testing of
the Combined Radiant Barrier and Duct Models in the ESL’s Code-Compliant
Simulation Model" by S. Kim that suggested that DOE-2.1 documentation
recommends modeling the radiant barrier as an additional R-8.1 of insulation in
the attic. Is this effective at yielding similar results to a real life
radiant barrier installation?</p>
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