[Bldg-sim] Dormitory LPD

[Rosenberg, Michael I]

The dorm itself is a "dwelling unit", which is exempt from the entire
Chapter 9 requirements (2004 uses the term "living unit"). So I think
the 1.1 W/sf or 1.0 W/sf does not apply to the dorm room. My opinion is
that the lpd in the baseline dorm room should be the same as in the
proposed building unless the applicant convinces the "rating authority"
that what they are proposing is a "significant verifiable departure from
documented conventional practice", per Appendix G. 
 
Mike
 

__________________________ 

Michael Rosenberg 
Senior Commercial Buildings Energy Analyst 
ENERGY & ENVIRONMENT DIRECTORATE 

Pacific Northwest National Laboratory 
2032 Todd Street 
Eugene, OR 97405 
(541) 844-1960 
michael.rosenberg at pnl.gov 
www.pnl.gov 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Dan Russell
Sent: Thursday, November 20, 2008 3:28 PM
To: Bishop, Bill; Howe, Timothy; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Dormitory LPD



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 

 

 

 

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

P Please consider the environment before printing this email

________________________________

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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