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

[Nathan Miller via Equest-users]

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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