[Bldg-sim] leed & process loads

[James V. Dirkes II, PE]

Dear Cramer,
 
A recent LEED Silver project used this explanation:
 
"Process load is comprised of receptacles and elevators only, and accounts
for slightly less than 17% of the total energy cost.  The receptacle load is
assumed to be 0.75 W/sf throughout, which is consistent with ASHRAE 90.1 and
reflects the tenants' concern for efficient office equipment. The receptacle
loads also use diversity factors that roughly parallel occupancy.  The
elevator energy is derived using actual KW and a diversity schedule that
reflects normal usage patterns. 
The Diversity schedules are shown on the accompanying updated "HVAC Data
Summary". These values are based on  actual, designed peak energy use and
appropriate diversity.  Therefore, even though somewhat lower than 25% of
the total energy cost, we are confident that they reflect the actual
situation adequately and should be considered acceptable."
 

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

 


  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Cramer
Silkworth
Sent: Friday, August 21, 2009 1:27 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] leed & process loads


Hi All,

I'm working up a detailed breakdown for process loads in a LEED model, to
justify using less than 25% of total. I'm wondering what other people have
gotten down to. If you've submitted with lower than 25%, how low did you
get, and how detailed was your analysis supporting it? I've got computers
and other electronic equipment, task lighting, and I'm working on the
elevator. Anything I'm missing? The building is ~50,000 sf, mostly office,
but also a workout area (I'm accounting for treadmills but nothing else
draws any power).

Thanks,
Cramer

-- 
J. Cramer Silkworth
Transsolar Climate Engineering
Technical consulting for energy efficiency and environmental quality in
buildings.
134 Spring Street, Suite 601
New York, NY 10012
212-219-2255
silkworth at transsolar.com 

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