[Equest-users] eQuest and Radiant Barriers

[Graham Sattler]

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).
<equest-users at lists.onebuilding.org>
On Thu, Apr 15, 2010 at 12:00 PM, Ramirez, Bob <Bob.Ramirez at itron.com>wrote:

>  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.
>
>
>
> *Bob Ramírez, P.E.*
>
> Itron Consulting & Analysis Group > http://www.itron.com/consulting<http://www.itron.com/pages/products_category.asp?id=itr_000796.xml>
>
> *11236 El Camino Real > San Diego, CA  92130*
>
> *Main: 858-724-2620*   *Direct: 858-724-2650  Cell: 858-692-5676*
>
> *E-mail > Bob.Ramirez at Itron.com***
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Graham Sattler
> *Sent:* Thursday, April 15, 2010 9:46 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] eQuest and Radiant Barriers
>
>
>
> 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?
>
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