[Bldg-sim] leed & process loads

[James Hess]

FYI…  We have actual detailed measured data from two recent projects.  By measuring fans, pumps, fan powered VAV boxes, electric heat on VAV boxes, chillers, lighting, etc. and then subtracting all of that off the total building electricity …. we found that for one of the buildings the misc equip was 10% and the other was closer to 25%.  The misc equipment did include elevators but we didn’t break out elevators separately.  The building with 10% misc equipment loads was a higher education type building with a mix of classrooms and offices.  The building with 25% misc equipment was a 8-5 M-F state office building.  I was kind of surprised that the misc equipment was as high as it was for the office building.  I didn’t think it would get that high… but it was.  Maybe something for the building to work on with their energy management program (i.e. space heaters ???).  It would be nice if we had better or more benchmark data for misc equipment to compare to.  Something for our industry to work on.  If everybody who is doing detailed M&V out there could report the results to a common entity for data sharing, that would be a good idea.  That could give people a range of real numbers to compare to.

Regards,

JAH

James A.  Hess, PE, CEM
Energy Engineer
TME, Inc.
Little Rock, AR
ph   501-666-6776
cell  501-351-4667
jhess at tmecorp.com<mailto:email at tmecorp.com>

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James V. Dirkes II, PE
Sent: Saturday, August 22, 2009 11:44 AM
To: 'Chris Jones'
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] leed & process loads

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" />



________________________________
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<mailto:silkworth at transsolar.com>


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Chris Jones
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Tel.  416-203-7465
Fax. 416-946-1005
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