[Equest-users] Building Walls

[Dahlstrom, Aaron]

Peter -

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.

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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").

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.")

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I'm just learning about this issue, so any wisdom from more experienced folks would be welcome!

Aaron

Aaron Dahlstrom , PE, LEED(r) AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102
d: 215-282-6753| m: | In Posse: 215-282-6800| AKF: 215-735-7290
e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com<http://www.in-posse.com/> | akf web: www.akfgroup.com<http://www.akfgroup.com/>



From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Hillermann
Sent: Monday, September 10, 2012 2:02 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Building Walls

To All:

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.

Our exact comment was this:
The Baseline Case roof and exterior wall U-values reported in Table 1.4.1A (U-0.048 and U-0.065, respectively) are
inconsistent with the U-values reported in the LV-D report (U-0.054 and U-0.063, respectively). Please ensure consistency
across construction drawings, software summaries, and the EAp2 Template.

Hope it helps.

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.

PS: Thank you to this forum, we ended up getting LEED Certified.

Thanks,

PETER HILLERMANN

peterh at westallarchitects.com<mailto:peterh at westallarchitects.com>

westall
architects
3404 pierce drive
chamblee, georgia 30341

o 770.458.4113
c 678.898.2936

westallarchitects.com
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