[Bldg-sim] ASHRAE 90.1-2004 and task lights

Fri Mar 12 12:47:21 PST 2010

Yes, what you stated below was also my understanding until the question was asked. If you looking at lighting power from an energy modeling standpoint, yes, all lighting  must be included and task lighting is treated as plug load and accounted for accordingly. However, in my project’s case, as we are talking exclusively about lighting alone and anything that qualifies as a plug load need not be included. I need to find the copy of the ASHRAE std that I could attach as reference.

Thanks for your input and clarification. Appreciate it.

Priya

Priya Premchandran, Int'l Associate AIA, LEED® AP
www.serapdx.com<http://www.serapdx.com>
503.445.7368

From: Nick Caton [mailto:ncaton at smithboucher.com]
Sent: Friday, March 12, 2010 12:41 PM
To: dlombard at earthlink.net; Priya Premchandran; bldg-sim at lists.onebuilding.org
Cc: Mark Loeffler
Subject: RE: [Bldg-sim] ASHRAE 90.1-2004 and task lights

There’s a subtle but important distinction I think we’re making here within 90.1-2004:

9.1.3 and the glossary in combination define “installed interior lighting power.”  Reading both appropriate passages, you can conclude this only includes “permanently installed” fixtures.  I think we can all agree cord and plug receptacles are in general not supposed to be included in any normal LPD (W/SF) calculation (for compliance documentation or otherwise).

Priya and the USGBC reviewer we’re discussing however are bringing up a separate issue, which is the passage in Appendix G that specifically tells us to handle cord and plug task lighting in a different manner.  This is specifically in the context of baseline/proposed energy models, and would not apply to any LPD sums made for purposes outside of energy modeling against a 90.1 baseline.  I’ve copied my response below for reference.

~Nick

[cid:image001.jpg at 01CAC1E2.28356CC0]

NICK CATON, E.I.T.
PROJECT ENGINEER
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
Check out our new web-site @ www.smithboucher.com

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of dlombard at earthlink.net
Sent: Friday, March 12, 2010 11:45 AM
To: Priya Premchandran; bldg-sim at lists.onebuilding.org
Cc: Mark Loeffler
Subject: Re: [Bldg-sim] ASHRAE 90.1-2004 and task lights

It was my understanding that only hard wired tasks lights were included in the watts/Sf calcs.
You could ask "Mark Loeffler" <ml at atelierten.com>, who's AT's Lighting Director. He'll know for sure.

___

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Friday, March 12, 2010 11:45 AM
To: Priya Premchandran
Cc: BldgSim Mailing List
Subject: Re: [Bldg-sim] ASHRAE 90.1-2004 and task lights

The appropriate section happens to be right in front of me – assuming you have task lights defined in the construction documents (plans/specs) being reviewed, it looks to me that your USGBC reviewer is correct, but not telling you the whole story…

90.1-2004, Appendix G, Table G3.1, Section 6. “Lighting” (d):

“Lighting system power shall include all lighting system components shown or provided for on the plans (including lamps and ballasts and task and furniture-mounted fixtures).”

The following exception for multifamily dwellings and hotel/motel guest rooms makes a distinction regarding cord + receptacle task lights:

“Exception: For… spaces in which lighting systems are connected via receptacles and are not shown or provided for on building plans, assume identical lighting power for the proposed and baseline building designs in the simulations, but exclude these loads when calculating the baseline building performance and proposed building performance.”

Falling back to the glossary definition for performance (cost), that means if you are modeling the task lights, add their wattage identically to the baseline and proposed model LPD’s to model the internal load contributions, but then subtract the cost of the energy to operate those fixtures from the final costs you arrive at.

In summary, you should model the task lights as internal loads, but not the cost of operating them.  That’s my take anyway =),

~Nick

[cid:image001.jpg at 01CAC1E2.28356CC0]

NICK CATON, E.I.T.
PROJECT ENGINEER
25501 west valley parkway
olathe ks 66061
direct 913 344.0036
fax 913 345.0617
Check out our new web-site @ www.smithboucher.com

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Priya Premchandran
Sent: Friday, March 12, 2010 11:16 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1-2004 and task lights

Hello Listserv members,

I just received a question from GBCI on a LEED CI project related to lighting power density. It was my understanding that per ASHRAE 90.1-2004 std. plugged in task lights are exempted from the overall lighting power density calculations. However, our review came back saying that task lights should be included in the overall calculations. Is this true? Has the standard changed recently?

 Any input is greatly appreciated.

Thanks,
Priya

Priya Premchandran, Int'l Associate AIA, LEED® AP
www.serapdx.com<http://www.serapdx.com>
503.445.7368
P Please consider the environmental impact before printing this email

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