[Bldg-sim] Vestibule Modeling

[Jim Dirkes]

Robert,
Did you notice the 7 exceptions to section 5.4.3.4?  One of them may apply to you…
As far as modeling goes, a vestibule is principally an infiltration control technique, so I suppose that you could argue for reduced infiltration when vestibules are present.  I am unaware of any research or other information about how they may affect infiltration.  Since infiltration is such a guessing game, I never apply any special curves for vestibules.
p.s., the IECC 2012 (Int’l Energy Conservation Code) includes mandatory envelope and infiltration testing and criteria.  This will probably be a game changer for the construction industry in areas that adopt this code and will definitely affect the energy models prepared for those projects.

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rosenberg, Michael I
Sent: Tuesday, July 30, 2013 11:16 AM
To: 'RobertWichert'; 'bldg-sim at lists.onebuilding.org'; 'equest-users at lists.onebuilding.org'
Subject: Re: [Bldg-sim] Vestibule Modeling

Any of the mandatory requirements in Standard 90.1 must be included in your building design and cannot be traded off using a performance approach.



____

______________________

Michael Rosenberg, CEM, LEED AP
Senior Research Scientist
ENERGY & ENVIRONMENT DIRECTORATE

Pacific Northwest National Laboratory
2032 Todd Street
Eugene, OR 97405
(541) 844-1960
michael.rosenberg at pnnl.gov<mailto:michael.rosenberg at pnnl.gov>
www.pnnl.gov<http://www.pnnl.gov>



-----Original Message-----
From: RobertWichert [robert at wichert.org<mailto:robert at wichert.org>]
Sent: Tuesday, July 30, 2013 08:08 AM Pacific Standard Time
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Bldg-sim] Vestibule Modeling



I see that ASHRAE 90.1 requires a vestibule in most cases, but I don't
know if it is modeled or if it is just mandatory.  It would seem to me
that if it was modeled, showing compliance using modeling, without a
vestibule, would be OK (you would make it up somewhere else in the
envelope).  Does anybody know if the vestibule is modeled anywhere, and
how to take it out or put it in?

Since LEED requires compliance with ASHRAE 90.1 Mandatory measures, this
makes a vestibule a mandatory requirement unless I can model it with and
without.  If this is even possible.

Otherwise we must put in a vestibule to comply with LEED.


Is this correct?  Does anybody have other thoughts or ideas?  We have a
very efficient building, modeled without the vestibule in Climate Zone
3B.  I would think that we could take a heating penalty and not install
a vestibule AT EVERY DOOR.


I appreciate your thinking about this.



--
Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







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