[Bldg-sim] ASHRAE 90.1 building rotation reasoning

[Gregg Liddick]

Addendum A states to use SHGCall for north windows and I believe this is the only prescription from Addendum A that project teams are required to follow.  You’re right, the USGBC only started enforcing that 3-4 months ago.  The U-factor has always been the fixed value as far as I know.

In LEED 2009/LEED v3 ASHRAE 90.1-2007 will be followed and project teams will once again have to model projects using SHGCnorth.

Best Regards,

Gregg Liddick, EIT, LEED® AP

The Epsten Group, Inc.
429 Edgewood Avenue
Atlanta GA 30312
Phone: 404-577-0370  ext. 102
Fax: 404-577-1739
www.theepstengroup.com<http://www.theepstengroup.com>

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of JHANSEN
Sent: Tuesday, May 12, 2009 3:08 PM
To: Cramer Silkworth
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1 building rotation reasoning

On a sort of related topic - was there ever an addenda that allowed you to use the Uvalue and SC for the NORTH walls instead of the Uall for all orientations.  Just got called out on this for a recent project, but have used the North coefficients on at least 5 previous projects successfully... Trying to understand the LEED inconsistency.  For that matter, why even have an entry on the EAc1 for the North orientation coefficients?

On May 12, 2009, at 2:20 PM, "Cramer Silkworth" <silkworth at transsolar.com<mailto:silkworth at transsolar.com>> wrote:
Shoot, I was thinking of the fenestration distribution change in Addedum A. Sorry all.

-Cramer

________________________________

From: Robby Oylear [mailto:robbyo at rushingco.com]
Sent: Tuesday, May 12, 2009 2:05 PM
To: Cramer Silkworth; christopher.zabaneh at ibece.net<mailto:christopher.zabaneh at ibece.net>
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: RE: [Bldg-sim] ASHRAE 90.1 building rotation reasoning
I think you’re mistaken.  You may be thinking of addenda a  which removes the requirement to spread all glazing equally across all orientations of the building.  Which addenda removes the requirement to rotate your building?

Robby Oylear, LEED® AP
Mechanical Engineer
direct: 206.788.4571
cell: 206.354.2721
www.rushingco.com<http://www.rushingco.com/>

From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Cramer Silkworth
Sent: Tuesday, May 12, 2009 11:02 AM
To: christopher.zabaneh at ibece.net<mailto:christopher.zabaneh at ibece.net>
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] ASHRAE 90.1 building rotation reasoning

Christopher,

One of the addenda to 90.1 removes this requirement and the use of addenda is accepted by USGBC, so you don't need to waste your time.

-Cramer

J. Cramer Silkworth
Transsolar Inc.
Technical consulting for energy efficiency and user comfort in buildings. Stuttgart - Munich - New York
134 Spring Street Suite 601
New York, NY 10012
212-219-2255
silkworth at transsolar.com<mailto:silkworth at transsolar.com>

________________________________

   From: Christopher Zabaneh [mailto:christopher.zabaneh at ibece.net]
Sent: Tuesday, May 12, 2009 1:33 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] ASHRAE 90.1 building rotation reasoning
What is the original reasoning behind the ASHRAE 90.1 Appendix G building rotations through 0, 90, 180 and 270 degrees?

If the building is only going to have one orientation, why go through the trouble of rotating and averaging the building values when there should be only one base case?

Are steps being taken by ASHRAE or the energy modeling community to change this?

Thanks kindly,

Christopher F. Zabaneh
B.Sc.Eng, LEED® AP
IBE Consulting Engineers
14130 Riverside Drive, Suite 201
Sherman Oaks, CA 91423-2313
p    (818) 377-8220  X 295
f     (818) 377-8230
IDEAS FOR THE BUILT ENVIRONMENT<http://www.ibece.com/>

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