[Equest-users] dwelling unit / residential LPDs

Bishop, Bill wbishop at pathfinder-ea.com
Wed Dec 8 06:25:57 PST 2010


Joe,
 
The dwelling units exception in Appendix G applies to "spaces in which
lighting systems are connected via receptacles and are not shown or
provided for on building plans." You say you've worked hard to reduce
lighting energy use, so presumably, you've designed the lighting for the
spaces and it appears on the plans. Therefore, you are justified in
using your actual lighting design for the proposed building model, and
the LPD value for the baseline, which should be 1.1 W/ft2 for living
quarters per Table 9.6.1.
 
Regards,
Bill
 
William Bishop, PE, BEMP, LEED(r) AP | Pathfinder Engineers & Architects
LLP
Mechanical Engineer
 
 134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114                F: (585) 325-6005
wbishop at pathfinder-ea.com           www.pathfinder-ea.com
<http://www.pathfinder-ea.com/> 
P   Sustainability - the forest AND the trees. P 
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick
Caton
Sent: Tuesday, December 07, 2010 7:16 PM
To: Joe Snider; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] dwelling unit / residential LPDs
 
Hey Joe,
 
If you're looking to start somewhere...  I know the NEC (NFPA 70) lays
out a clear method of estimating dwelling unit lighting loads within
Article 220.  It starts off seeming high (3W/SF), but there are heavy
demand factors that vary with the total calc'd load following within the
same article: i.e. first 3,000 @ 100%... 3,000 to 120,000 @ 35% etc...
 
While I've yet to fall back on the NEC as an energy modeling resource,
I'm unaware of any better direct source for residential lighting
loads... I imagine if you dig hard enough, one of the ASHRAE handbooks
probably has something along these lines as well that might give you a
different sum.
 
I think ASHRAE Fundamentals does have a clear thing or two to say
regarding what percentage of the lighting load should end up in a space
vs. a plenum when you are talking about different lamp sources
(incandescent vs. CFL...) - something to be aware of if you want to
pursue this avenue.
 
~Nick
 
 
 
NICK CATON, E.I.T.
PROJECT ENGINEER
Smith & Boucher Engineers
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
www.smithboucher.com 
 
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe
Snider
Sent: Tuesday, December 07, 2010 5:24 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] dwelling unit / residential LPDs
 
I have reviewed the archives and found a few threads on this topic but
couldn't find either good resolution, or a clear enough string to reply
to, so I thought I would re-post:
 
ASHRAE 90.1 App G doesn't let you include dwelling units in typical LPD
calcs.  They say you need to plug in the same number for both proposed
and baseline.
 
But you can apparently pursue exceptional calcs to justify any cost
savings in LEED.  But you need to show some kind of analysis as to how
you chose a baseline, such as a study or something presumably that shows
typical w /sf for residential.
 
We have worked very hard to reduce energy use in lighting in a few
high-rise residential projects and would like to be able to receive
credit for that on our energy model.
 
Has anyone been through this with USGBC and / or know of a good resource
for a baseline w / sf for residential?
 
In advance, thank you very much.  Great forum.
 
Sincerely,
 
Joe Snider
 
---
Joe Snider, AIA, LEED AP
 
SEQUIL Systems, Inc.
high performance sustainable structures
 
1 SE 4th Ave, Suite 205
Delray Beach, FL 33483
t: 561.921.0900
f: 561.208.6090
 
www.SEQUIL.com
 
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