[Equest-users] Lighting Power Density

[David Eldridge]

Reading between the lines a bit, I believe the reviewer is probably more
worried about using proposed lighting kW for the model while the baseline is
using LPD that include areas of shafts or chases which could penalize the
baseline unfairly.  (Maybe airflow too, although you don’t mention this.)



Clearly it is intended by 90.1 to be the center of the partition between two
occupied spaces, however I guess the question here is whether the definition
of the surface around the chase or column is a partion or not…so  personally
I’d use the center of that enclosing surface around the shaft/chase/column.
There seems to be some concern by the reviewer about a noticeable area
over-contributing to the baseline energy usage, so I wouldn’t use the option
for “center of the chase” or “center of the column” as a possibility if you
agree that this is the concern.



David

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David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP

*Grumman/Butkus Associates*

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*From:* equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] *On Behalf Of *M. Shields
*Sent:* Thursday, May 19, 2011 4:19 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Lighting Power Density



Good Afternoon All,



Hopefully this is a simple question.  I recently got comments back from LEED
questioning the lighting power density for some of the areas in my Appendix
G model.  The comments asked me to provide floor plans for the areas in
question.  I am using the space by space method which says area should be
calculated from the center of partition walls.  For the areas in question
some of the walls have a chase for plumbing, some have structural columns,
etc.  My question is this, in my model I did not create separate zones are
anything for this non habitable area, I just have an interior wall.  Should
the LPD be calculated to the center of the chase?  To the center of the
column?  The center of the wall surrounding the chase?  None of these will
make a significant impact on my savings, however, I don’t want the reviewer
to reject my number saying something such as “your floor plan included the
chase when it should have stopped at the center of the wall surrounding the
chase”



Thanks for any opinions or experience getting something like this passed by
LEED.



____________________________
Michael Shields

Email: mshields at fstrategies.com
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