[Equest-users] Curtain wall system - how to model baseline?

[Michael Campbell via Equest-users]

Great tip!  Thank you

On Thu, Jul 28, 2016 at 1:18 PM, Nathan Miller <nathanm at rushingco.com>
wrote:

> Also if, you have conditioned spaces in an unconditioned parking garage
> (elevator lobbies, heated storage, mech/elec spaces, back of house space,
> etc), the walls that separate the conditioned space from unconditioned
> count in your wall areas, and typically don’t have much glazing, and help
> bring your proposed glazing % down.
>
>
>
>
>
> *Nathan Miller, PE, LEED AP BD+C** – **Mechanical Engineer/Senior Energy
> Analyst*
>
> *RUSHING* | *D* 206-788-4577 | *O* 206-285-7100
>
> *www.rushingco.com <http://www.rushingco.com/>*
>
>
>
> *From:* Nicholas.Caton at schneider-electric.com [mailto:
> Nicholas.Caton at schneider-electric.com]
> *Sent:* Thursday, July 28, 2016 1:12 PM
> *To:* mcamp1206 at gmail.com; Nathan Miller <nathanm at rushingco.com>
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* RE: [Equest-users] Curtain wall system - how to model baseline?
>
>
>
> Spandrel (opaque) sections of curtainwall are “walls” in both proposed and
> baseline cases as far as 90.1 terminology is concerned.  Consider them as
> such for determining both Proposed and Baseline case WWR’s.
>
>
>
> In my past year of experience, similar to Nathan, I’ve dealt with many
> “fishbowl” buildings which appear all (or mostly) glass from the outside
> but typically have at least few feet of insulated envelope on the interior
> perimeter, so in that case it’s literally a wall construction with the
> outermost layer being glazing (or airspace then glass).
>
>
>
> Be sure to dig up any relevant envelope sections/details to carefully draw
> the line between “opaque” and “not opaque.”
>
>
>
> ~Nick
>
>
>
>
>
>
>
> *Nick Caton, P.E.*
>
>   Senior Energy Engineer
>   Energy and Sustainability Services
>   North America Operations
>   Schneider Electric
>
> D  913.564.6361
> M  785.410.3317
> E  nicholas.caton at schneider-electric.com
> F  913.564.6380
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
> United States
>
> [image: cid:image001.png at 01D189AB.58634A10]
>
>
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Michael
> Campbell via Equest-users
> *Sent:* Thursday, July 28, 2016 11:12 AM
> *To:* Nathan Miller
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Curtain wall system - how to model baseline?
>
>
>
> Thanks for the response Nathan.
>
> There will be some spandrel glass, but I'm not sure how much.
>
> But basically the spandrel portion would be considered a wall in the
> baseline.
>
> Only the transparent window assemblies would be considered in the WWR.  Is
> that correct?
>
> Thank you,
>
> Mike
>
>
>
> On Thu, Jul 28, 2016 at 11:53 AM, Nathan Miller <nathanm at rushingco.com>
> wrote:
>
> Would there really be no opaque portions (aka spandrel) of the curtain
> wall? At the very least I’d expect you’d have about a 1’ high
> slab-edge-bypass opaque section.
>
>
>
> Our curtainwall projects (resi and office) typically have 40-50% vision
> glazing, and the rest is opaque, and gets modeled as a wall with calculated
> U-factor depending on the spandrel + inboard insulation configuration.
>
>
>
>
>
> *Nathan Miller, PE, LEED AP BD+C** – **Mechanical Engineer/Senior Energy
> Analyst*
>
> *RUSHING* | *D* 206-788-4577 | *O* 206-285-7100
>
> *www.rushingco.com <http://www.rushingco.com/>*
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Michael Campbell via Equest-users
> *Sent:* Thursday, July 28, 2016 11:51 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Curtain wall system - how to model baseline?
>
>
>
> Hello,
>
> I have a potential project in which the client is proposing a curtain wall
> system.
>
> The model will be based on ASHRAE 90.1-2013 Appendix G.
>
> I believe the appropriate way to model this would be to have a WWR of 100%
> (or near 100%) in the proposed case.  For the baseline case, the window
> area would have to be reduced to get the WWR down to 40%.
>
> Is this the correct way or is there different guidance for modeling
> curtain wall systems?
>
> Thank you,
>
> Mike Campbell
>
>
>
>
> ______________________________________________________________________
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