[Equest-users] dwelling unit / residential LPDs

[Bishop, Bill]

There is an exception to the scope of section 9.1.1, for "lighting
within dwelling units". However, in addition to the 1.1 W/ft2 allowance
for hotel/motel guest rooms and dormitory living quarters in the
space-by-space method, there is the 0.7 W/ft2 allowance for
"multifamily" using the building area method (Table 9.5.1). This seems
to be another area where the Standard is vague. Many of my projects have
been dormitories, which do not contain "dwelling units" as defined in
section 3, since the residence spaces don't contain kitchens. So I have
not had to apply this exception yet.
 
Bill
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James
Hansen
Sent: Wednesday, December 08, 2010 3:43 PM
To: Aleka Pappas; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] dwelling unit / residential LPDs
 
Is there a CIR or something that says that residential LPD is
unregulated?
 
Table G3.1 is pretty specific about residential unit lighting for the
proposed model (see below):
 
 
 
As long as the lighting is shown on building plans and permanently
wired, you are allowed to use the actual lighting power.   I have done
10+ residential projects where we've listed 1.1 W / sq ft for the living
/ bedroom areas for the baseline building, and used the actual density
for the proposed model, and been approved.  There certainly isn't
anything wrong with doing it the ECM route, but where, specifically,
does it say you can't take credit for any residential unit lighting
efficiencies?  
 
GHT Limited
James Hansen, PE, LEED AP
Senior Associate
1010 N. Glebe Rd, Suite 200
Arlington, VA  22201-4749
703-338-5754 (Cell)
703-243-1200 (Office)
703-276-1376 (Fax)
www.ghtltd.com <http://www.ghtltd.com/> 
 
 
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Aleka
Pappas
Sent: Wednesday, December 08, 2010 3:25 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] dwelling unit / residential LPDs
 
That 1.1 W/SF from section 9 doesn't apply to apartment or condo
dwelling units.  Residential unit LPD is unregulated.  We calculate
savings for residential lighting as an exceptional calculation using a
baseline LPD sited from research (which is kind of all over the place),
and calculate savings for installed lighting systems that provide for
full illuminance in specific spaces in the residential units.  The
lighting is scheduled on for 750 hours/ year (from an old LEED CIR).
These calcs have been approved in the past for LEED EAc1 under NC 2.2
and 3.0.
Aleka Pappas
Building Energy Engineer

GROUP14 ENGINEERING, INC. 
Inspiring better buildings. 
1325 E. 16th Ave, Denver, CO 80218 
Direct: 720.221.1082/ Main: 303.861.2070/Fax: 303.830.2016
APappas at group14eng.com
www.group14eng.com

Group 14 is the Carbon Group on the periodic table. Group14 Engineering
offers building energy optimization, LEED coordination, commissioning,
energy audits, LEED EBOM, and greenhouse gas analysis to reduce building
and communities' carbon footprint. 

On 12/8/2010 7:25 AM, Bishop, Bill wrote: 
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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