[Bldg-sim] Exterior Lighting Power Calculation for Building Facades

weixiu kong weixiuk at yahoo.com
Thu Feb 4 09:59:50 PST 2010


Robby,

My understanding is: since this is a non-tradable surface, base line and proposed design should be the same even though it is well below allowances.

Thanks,

Weixiu




________________________________
From: Robby Oylear <robbyo at rushingco.com>
To: bldg-sim at lists.onebuilding.org
Sent: Thu, February 4, 2010 10:21:28 AM
Subject: [Bldg-sim] Exterior Lighting Power Calculation for Building Facades


Can anyone with experience showing compliance with ASHRAE 90.1-2004 section 9.4.5 enlighten me as how the baseline calculation should be done? 
 
The confusion I’m having is with the definition of an illuminated wall or surface length when applying the 5.0 W/linear foot allowance for building façades.  How is the lineal footage of an illuminated wall determined?  
 
For example, if a 100’ wide wall has one exterior lighting fixture on it at the center, is the entire wall considered to be illuminated and thus the baseline lighting power allowance is 500W?  Or is there some method of determining the actual portion of the wall that is illuminated?
 
This came up on a LEED project where I had applied table 9.4.5 as conservatively as possible and only considered a portion of the wall to be illuminated at each fixture.  
 
Any help would be greatly appreciated.
 
Robby Oylear, LEED® AP
Mechanical Engineer
direct: 206.788.4571
cell: 206.354.2721
www.rushingco.com


      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20100204/f73010e0/attachment-0002.htm>


More information about the Bldg-sim mailing list