[Bldg-sim] ASHRAE 90.1 building rotation reasoning

Hernandez, Arturo ahernandez at owpp.com
Tue May 12 11:16:30 PDT 2009


I agree with Robby. There is no such addenda. The reason the rotation of the is because of glazing and wall orientation. ASHRAE tries to give credit to the design team for beneficial building orientation. I know and understand that in most cases the buildings footprint is dictated by the sites foot print but glazing could also be reduced on the more solar heat gaining orientation. If for instance a designer builds a building with 100% glass on the south side. It would be better to orientate the glass north because of solar heat. However, if you have an existing building you do not have to rotate it at all.

 

ARTURO HERNANDEZ, LEED AP

 

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Robby Oylear
Sent: Tuesday, May 12, 2009 1:05 PM
To: 'Cramer Silkworth'; christopher.zabaneh at ibece.net
Cc: 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] On Behalf Of Cramer Silkworth
Sent: Tuesday, May 12, 2009 11:02 AM
To: christopher.zabaneh at ibece.net
Cc: 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 

 

________________________________

   From: Christopher Zabaneh [mailto:christopher.zabaneh at ibece.net] 
Sent: Tuesday, May 12, 2009 1:33 PM
To: 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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