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

[Robby Oylear]

Weixiu,



The problem I am having is that I do not understand how to correctly 
calculate the baseline power allowance.  Part of the mandatory provisions of 
section 9.4.5 states that you cannot exceed the baseline exterior lighting 
power allowance with your proposed building.  By incorrectly calculating the 
baseline exterior lighting and showing this in my model the LEED reviewer 
has flagged my EAp2 credit for denial due to not complying with the 
mandatory provisions.



In short, I need to reply back with a corrected baseline lighting power 
allowance, which I am having trouble with due to the unclear definition of 
“illuminated wall”.



Robby Oylear, LEED® AP

Mechanical Engineer

direct: 206.788.4571

cell: 206.354.2721

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



From: bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of weixiu kong
Sent: Thursday, February 04, 2010 10:00 AM
To: Robby Oylear; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Exterior Lighting Power Calculation for Building 
Facades



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







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