[Equest-users] Wall insulation in multifamily buildings

[John Aulbach via Equest-users]

Two cents from the Old Guy..
I did an eQuest model for a house in Southern California for the gas Company. Changed lighting wall R-value and window treatment. Wall impact was much as Michael found it. Biggest impact was window treatment..and that was in the 2-4% range.
Insulation has its greatest impact on heating. Window treatment on cooling. It also depends on how much outside surface touches the building. Interior rooms never see the sun (or the Moon).
Michael's results are not a mystery in most places in the contiguous US. Northern Canada or Finland, maybe more.
John R. Aulbach, PE 

    On Thursday, March 9, 2017 12:52 PM, Nathan Miller via Equest-users <equest-users at lists.onebuilding.org> wrote:
 

 #yiv6968246943 #yiv6968246943 -- _filtered #yiv6968246943 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv6968246943 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv6968246943 {font-family:Verdana;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv6968246943 #yiv6968246943 p.yiv6968246943MsoNormal, #yiv6968246943 li.yiv6968246943MsoNormal, #yiv6968246943 div.yiv6968246943MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv6968246943 a:link, #yiv6968246943 span.yiv6968246943MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv6968246943 a:visited, #yiv6968246943 span.yiv6968246943MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv6968246943 span.yiv6968246943EmailStyle17 {color:#1F497D;}#yiv6968246943 span.yiv6968246943EmailStyle18 {color:windowtext;}#yiv6968246943 .yiv6968246943MsoChpDefault {} _filtered #yiv6968246943 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv6968246943 div.yiv6968246943WordSection1 {}#yiv6968246943 Don’t know where your building is located, but on the Seattle area multifamily projects we routinely model, envelope has very little impact on building energy use. DHW and ventilation seem to be the items we have the most influence over that really can change the energy consumption.    FWIW, many of us in the Seattle market are starting to believe the standard plug/misc load assumptions from the Energy Star MF High Rise Sim Guidelines (if you are using them) overestimate that energy use, and result in more “free heat” in the building and thus less sensitivity to envelope changes (among other implications).       Nathan Miller, PE, LEED AP BD+C –Mechanical Engineer/Senior Energy Analyst RUSHING|O206-285-7100 |C207-650-3942 www.rushingco.com    From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org]On Behalf Of Michael Campbell via Equest-users
Sent: Thursday, March 09, 2017 3:44 PM
To: equest-users <equest-users at lists.onebuilding.org>
Subject: [Equest-users] Wall insulation in multifamily buildings    Hello eQUEST Users, I've been working on a model for a multifamily building, 5 stories, approximately 300,000 square feet.  I've been running a few iterations of the model to see how changes to the wall assembly affect the model results.  

What I've found is that changes in the wall assembly seem to have a minimal impact on the model results.  I just did a comparison where I took an assembly with R-19 cavity insulation and 2" rigid insulation and compared that to the same assembly but without the rigid insulation.  This was applied to the entire building.  What I found was only a 0.4% increase in total energy cost after taking out the rigid insulation.  I'm wondering if others have found similar results in multifamily buildings? Any input is appreciated. Thank you, Mike Campbell 
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