[Bldg-sim] leed & process loads

[James V. Dirkes II, PE]

My engineering sensibilities say, "If the facts bear out a lower-than-25% situation, then that's what should be accepted."  I'd be interested to hear what objections have been raised by reviewers who disputed your explanation......
 

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

 

 


  _____  

From: Chris Jones [mailto:cj at cr-jay.ca] 
Sent: Saturday, August 22, 2009 11:09 AM
To: James V. Dirkes II, PE
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] leed & process loads


You are fortunate that the explanation worked.  I used a very similarly worded explanation for a project I submitted and the reviewer didn't go for it.  "Inconsistency" seems to be the keyword for the review process.

At 03:31 PM 8/21/2009, James V. Dirkes II, PE wrote:


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<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />


 
 



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From: bldg-sim-bounces at lists.onebuilding.org [  <mailto: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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Chris Jones
14 Oneida Avenue
Toronto, ON M5J 2E3.
Tel.  416-203-7465
Fax. 416-946-1005



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