Building Orientation Is not Changing the Interior Lighting Load

asked 2018-05-10 06:02:36 -0600

Dongmin
91 ●3

updated 2018-05-10 06:53:41 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

Hi All,

I was investigating the effect of building orientation in OS 2.5.0, and it seems that my interior lighting load data is not changing at all no matter which orientation it is in. I have different window geometry on all facades of the building, and the nothing is uniform enough to admit even distribution of sunlight. Is this some kind of a coincidence? I have posted an overview of the building here:

image description

Thanks in advance folks,

answered 2018-05-10 11:19:05 -0600

rpg777
6980 ●6 ●15 http://openstudio.net/

The space doesn't look very deep, and it looks like the daylight sensor is between some large-ish windows, thus getting plenty of sky/sun access. Changes in orientation will have an impact, but the effect(s) will be smoothed out in the lighting load data. Also, what's your daylighting setpoint? If it's really high or low, the daylight dimming response will always (or never) change throughout the day, so there too you will not see a subtle load difference due to changes in orientation.

I recommend you look at the illuminance map data for a much clearer picture of the spatial daylight distribution. Unfortunately, DView does not actually allow you to look at that data (oops), but you could use an old copy of Results Viewer for this.

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Thanks for the prompt response! When you mention daylight setpoints, I assume the lighting schedule? They were on max fraction of 1 from 7am to 8pm, so that might be why the lighting load isnt changing. Ill have a go and see what happens.

Thanks!

Dongmin ( 2018-05-11 03:59:18 -0600 )edit

I was referring to the daylighting control point's setpoint. This setpoint is the illuminance level you wish to maintain in the space. If the daylight level meets or exceeds this value, the electric lighting load will be reduced to zero for that timestep.