[Bldg-sim] leed & process loads

Chris Jones cj at cr-jay.ca
Sat Aug 22 08:09:19 PDT 2009


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" />
>
>
>
>
>
>----------
>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
><mailto:silkworth at transsolar.com>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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