[Equest-users] Building Walls

[Bruce Easterbrook]

As an adder to this the wind speed also varies with the height of the 
building.  The wind speed for a locations weather file is at a standard 
reference height and would also be adjusted for height of the building.
Bruce Easterbrook P.Eng.
Abode Engineering

On 12/09/2012 12:22 PM, Nick Caton wrote:
>
> I can add a probable bit of method to the madness for those concerned:
>
> The reason exterior air film is not entered as a static property, nor 
> reported lumped in with the constructions' overall assembly U-values, 
> is because it's actually a variable property.
>
> The reference I have handy (Table 5-12, 2001 Fundamentals) lists 
> multiple resistance values for moving air (at various speeds) and 
> still air (for various surface orientations and directions of heat flow).
>
> I take it as implicit that eQuest/DOE2 models this variable 
> contribution from the exterior air film in consideration of the hourly 
> windspeed data available from the weather file, so presenting any 
> single value could be misleading.  I've had to make that clarification 
> a few times for those scrutinizing the construction reports without 
> the eQuest detailed simulation reports reference handy ;).
>
> Hope that helps a bit!
>
> ~Nick
>
> cid:489575314 at 22072009-0ABB**
>
> **
>
> *NICK CATON, P.E.***
>
> SENIOR ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway, suite 200
>
> olathe, ks 66061
>
> direct 913.344.0036
>
> fax 913.345.0617
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> www.smithboucher.com__
>
> *From:*equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Dahlstrom, Aaron
> *Sent:* Monday, September 10, 2012 4:20 PM
> *To:* Peter Hillermann; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Building Walls
>
> 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.
>
> 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.")
>
> I'm just learning about this issue, so any wisdom from more 
> experienced folks would be welcome!
>
> Aaron
>
> *Aaron Dahlstrom , PE, LEED® AP*
>
> *In P**o**sse*-- 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 <mailto: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> 
> [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 
> <mailto: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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