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

[Michael Campbell via Equest-users]

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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