Exterior Lighting

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Dear All,
How should we modle the exterior lighting? If I know the total exterior lighting
wattages, should I divide the total outdoor area to get watt / sq ft for?wizard
screen 23 inputing?

Thanks,
Lisa Li

Lisa Li's picture
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You can do that -- or wait and add as a direct load to the electric
meter in detailed edit mode (which is what the wizard is going to do
anyway).

bfountain's picture
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The phrasing is a little off for the wizard approach...

If you want to enter the exterior lighting wattage prior to detailed
edit and not have to correct it after the fact, divide the sum of the
installed exterior watts by the square footage of the shell you are
entering the W/SF value in (the exact area to use for this is displayed
on the 2nd shell screen). Enter that W/SF figure in only one shell if
you have multiples.

If you follow that, you'll have the exact installed watts entered
correctly.

Total exterior area lit does not come into the equation.

NICK CATON, E.I.T.

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Thanks Nick and Brian.
Do you mean for building energy modeling, it is not necessary to input exterior
lighting? If I try to get energy saving credit from exterior lighting, how
should I input baseline value?
Lisa Li

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Hi Lisa,

If you wish to model exterior lighting savings, by all means include it in your model(s)!

I only mean to caution that entering W/SF into more than one shell would be additive and might result in a total installed watts you didn?t intend for ? it is much simpler in wizards stage to limit input for all exterior lighting to a single shell, per my instructions below.

You would likely input your baseline values in the same fashion as your proposed? Your options include manually entering via W/SF in the wizards, manually entering as installed kW in the detailed edit, or alternatively defining a parametric run with a modified value in the detailed edit. Note that in the wizards you don?t have the option to adjust the scheduling for such loads that you do in detailed edit.

If your question is rather ?what is the baseline value,? that answer depends on what your baseline standard is ? what are you modeling against? It?s likely either ?what?s currently installed? if it?s an existing building you?re improving/renovating, or else a figure you?ll need to calculate per 90.1 or a similar energy standard/code if it?s new construction/LEED. COMcheck is a free software package that can make such calculations very simple... but be sure you read and understand the standard being followed.

Best of luck!

NICK CATON, E.I.T.

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