[Bldg-sim] Dormitory LPD

[Dan Russell]

Bill, it sounds like you are applying the exception but I don't think it applies here since the lights in the dorm rooms are controlled on fixed wall-switches, and not connected via receptacles.  My understanding is that the proposed design should be modeled with W/sf as shown on the plans (however small it is) and the baseline be modeled with 1.0 W/sf as determined by the Building Area Method.  Note that if the Space-by-Space method were used the allowable baseline W/sf for the dormitory living areas is 1.1 W/sf.

If the lighting design has LPD less than baseline and fixtures are hard-wired, then credit should be taken.

Thanks,

 Dan Russell, EIT

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Thursday, November 20, 2008 2:31 PM
To: Howe, Timothy; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Dormitory LPD

Tim,

Table G3.1, No. 6(d) states: "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). Exception: For multifamily living units, hotel/motel guest rooms, and other 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 designs in the simulations, but exclude these loads when calculating the baseline building performance and proposed building performance." [Emphasis in original.]

The way I would implement this is to assign the same W/ft2 lighting to all dorm rooms on a different meter in both the baseline and proposed designs. Then I would subtract the kWh of that meter from the building performance. You could still show lighting savings if you do the space-by-space method for both designs (assuming the lighting in your corridors and common areas is efficient).

Regards,
Bill

William Bishop, EIT, LEED(r) AP | Pathfinder Engineers LLP
Mechanical Engineer

3300 Monroe Ave., Suite 306
Rochester, NY  14618
TEL (585) 218-0730 Ext. 114
FAX (585) 218-0737
bbishop at pathfinderengineers.com

www.pathfinderengineers.com
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Howe, Timothy
Sent: Thursday, November 20, 2008 4:10 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Dormitory LPD

Sim-users,

I have a dormitory with something like 3/4 dorms and the rest support areas.

My question is:

ASHRAE 90.1-2004 calls for in the building wide approach for lpd to be 1.0 w/sf for dorms.

Now if there are wall switched fixed lights called for on the electrical lighting plans in the dorm rooms but have only a small w/sf contribution, can I really do a building wide lpd calc and claim the savings shown on the plans??

Any suggestions??

Thanks.
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