[Equest-users] dwelling unit / residential LPDs

[Joe Snider]

Hi Bill,

 

Thanks for the response.  That is actually exactly what we did - and USGBC
rejected it citing a LEED NC 2.2 CIR, even though this is a LEED 2009
project and they are saying old CIRs are not applicable to new projects
anymore.  

 

Their only direction is to plug in 1.1 w / Sf for both sides of the
equation.  However, the CIR they reference opens the door for exceptional
calculations, with good justification.  What could be more justified than
using the 1.1 w / SF that ASHRAE has for similar spaces?

 

It is a bit confusing because there seems to be an implication that
somewhere in ASHRAE it dictates using the same numbers for proposed and
baseline for hard-wired lighting in dwelling units.  We can't find any
direction to that effect anywhere, which it seems would leave it open to
interpretation.

 

At this time we are operating under the assumption that we can use the same
CIR they referenced, and therefore use exceptional calcs.  Unless anyone
else has any thoughts..

 

 

Take care,

 

Joe

 

---

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

 

From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: Wednesday, December 08, 2010 9:26 AM
To: Joe Snider; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] dwelling unit / residential LPDs

 

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, LEEDR 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

 

cid:489575314 at 22072009-0ABB

 

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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