[Equest-users] dwelling unit / residential LPDs

[Aleka Pappas]

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
<mailto:swagner at 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/ft^2 for 
> living quarters per Table 9.6.1.
>
> Regards,
>
> Bill
>
> *William**Bishop, PE**, BEMP, LEED^® AP **|****Pathfinder Engineers & 
> Architects LLP***
>
> Mechanical Engineer
>
> 134 South Fitzhugh StreetRochester, NY 14608
> T: (585) 325-6004 Ext. 114F: (585) 325-6005
>
> wbishop at pathfinder-ea.com 
> <mailto:wbishop at pathfinder-ea.com>www.pathfinder-ea.com 
> <http://www.pathfinder-ea.com/>
>
> PSustainability – 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
>
> cid:489575314 at 22072009-0ABB**
>
> **
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway
>
> olatheks 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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