[Bldg-sim] pro-rating fan power to supply/return fans per 90.1-2007?

Andrew Craig AndrewC at InterfaceEng.Com
Tue Mar 15 14:24:07 PDT 2011


James---

 

This was discussed recently in the posts.  See the attached response
from last Tuesday.  

 

Mike Rosenberg commented that this is being addressed in the upcoming
90.1-2010 as such:

 

G3.1.2.10.1 The calculated system fan power shall be

distributed to supply, return, exhaust, and relief fans in the

same proportion as the proposed design.

 

Regards,

 

Andrew Craig PE, LEED AP
Project Mechanical Engineer

INTERFACE ENGINEERING
email andrewc at interfaceeng.com <mailto:andrewc at interfaceeng.com> 
direct 503.382.2696

www.interfaceeng.com <http://www.interfaceeng.com/> 




 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James
Hansen
Sent: Tuesday, March 15, 2011 12:05 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] pro-rating fan power to supply/return fans per
90.1-2007?

 

App G says that if the proposed building has return fans, the baseline
building is to be modeled with them as well, sized either at the minimum
required to ensure ventilation, or 90% of the supply volume, whichever
is greater.  And the fan power calculations show that the KW allowance
is for all supply, return, exhaust and relief fans combined.  

 

How do you generally pro-rate the fan power between supply and return
fans in the baseline model?  Ultimately it probably doesn't make too
much difference, but is there an actual ruling that tells you how to do
this?

 

Thanks,

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

 

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