exterior surface and parking garage lighting

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Dear all,

I hope I can get a quick answer for this simple question even though it
puzzled me. I modeled a LEED building which has a separate parking garage
and also surface parking. I have modeled the exterior lighting load for
those two parking areas as a direct load exterior usage end use option. The
comment I am getting from the reviewer is as follows.
"With regards to the parking garage lighting, this end use should be
modeled and reported separately from the exterior lighting end use. The
Baseline lighting power density should reflect the Parking Garage values
from either Table 9.5.1 or 9.6.1, as applicable. Table 1.4 should include
the input information as modeled. In the form, parking garage lighting may
be included under the interior lighting end use, provided Table 1.4 clearly
states the values modeled for the Baseline and Proposed Case. Since the
garage lighting schedule is typically different from the remainder of the
project, it is often easier to model garage lighting as a separate end use
so that the equivalent full load hours for interior lighting are not skewed
from the inclusion of a different lighting schedule."
Even if I separate the garage lighting from surface lighting and include it
in the interior direct load as exterior usage, the consumption breakage
still has one exterior usage and the two consumption numbers are added and
reported as one exterior usage number. My question is how I can manage to
report their consumption in two separate categories.

Thank you!

Beran Gurtekin-Celik, Ph.D.

Building Intelligence Group LLC
(716) 573-4431

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Joined: 2016-07-15
Reputation: 400

Hi Beran,

The simplest/quickest approach that would be to assign one or the other lighting load at the electric meter to an end use you aren?t otherwise observing in your results.

Commonly Refrig. Displays is available & unused (defaults to cyan on the ?rainbow? reports), & others like heat rejection or heatpump auxiliaries may be free depending on your system selections. Advantage: You can easily visualize/document the isolated usage with the native eQUEST reporting. Disadvantage: You have to explain with caveats every time someone else may actually look at your results that the end-use truly isn?t what it looks like.

A more nuanced (& ultimately more flexible) approach is to:

? Create a series of descriptive sub-meters ? you?ll assign the direct loads to each of these instead of your main meter.
[cid:image003.png at 01D223A4.58CBB6C0]

? Assign each to your building/utility meter (second tab when you double-click it in the component tree)
[cid:image004.png at 01D223A6.DB668CC0]

? Look to the SIM PS-F reports to review/document how much each draw is consuming in isolation for shared end uses. I package/upload all PS-F reports typically with my LEED projects when I have sub metered loads to account for.

Addl? Notes

? PS-E (?all fuel? , ?all electric?) reports still account for everything together, and are what aligns with the graphical ?rainbow? reports if you?re used to those

? Consider that the PS-F for a utility meter is still inclusive of its sub-meter consumptions. You can make your life harder (requiring more hand calcs / algebra at reporting time) if you leave one or more direct loads on the main meter that you need to distinguish later. Better to err towards create more submeters.

? It?s not uncommon in my experience to encounter errors concerning the meters after setting everything up correctly & trying to simulate. If you encounter these, save/reopen or reinitialize the project and you?ll find they go away.

I hope that helps!


[cid:image001.png at 01D2239E.500BEF10]
Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric

D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image001.png at 01D189AB.58634A10]

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