[Equest-users] Exterior insulation vs Exterior with Cavity insulation

[Nikola Kravik]

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?

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.

Best,n

Nikola Kravik, LEED AP [cid:image001.gif at 01CCDB64.42A31BA0]
Project Engineer

Willdan Energy Solutions
11875 Dublin Boulevard, Suite A-201
Dublin, California 94568
T. 925.556.2600 ext. 1228
C. 925.719.5883
F. 925.556.1444
nkravik at willdan.com<mailto:nkravik at willdan.com>
www.willdan.com/energy<http://www.willdan.com/energy>

[cid:image002.jpg at 01CCDB64.42A31BA0]

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of nic
Sent: Wednesday, January 25, 2012 1:01 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Exterior insulation vs Exterior with Cavity insulation

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.)

*framing 16" Mtl OC taken into account

<<< I should mention the building is very much internal load dominant as an education building with a lot of laboratory space >>>
The problem described below has been input into eQuest using material properties for all continuous insulation and a representative R-value for framing/insulation.


BASELINE - 90.1 - R6* + 7.5 ci na

ALT1 - only ext insulation R0.9 + 12 ci -8% savings (% energy under EUI - kBtu/sf/yr)

ALT2 - improved ext insulation R6* + 12 ci +1% savings

ALT3 - improved cavity insulation R7.1* + 7.5 ci +1% savings

ALT4 - all insulation improved R7.1* + 12 ci +2% savings

I guess the question really is; does the issue lie within the vav systems or the envelope or both?

As a novice, I greatly appreciate any help.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120125/41c14f25/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.gif
Type: image/gif
Size: 1348 bytes
Desc: image001.gif
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120125/41c14f25/attachment-0002.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 3030 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120125/41c14f25/attachment-0002.jpg>