Vertical illuminance map

asked 2016-06-17 18:33:41 -0500

Why does not vertical illuminance map work? I have a 6 story building which I don't want to place an individual illuminance map for every single floor. Instead I wanna put all of em in a thermal zone and add a vertical illuminance map in it (close to the facade) in order to see the light reflections off diffuse surfaces. But when I do it in sketchup, close and reopen the geometry again, the map is gone! Is that even logical to do so or is my idea basically stupid?

Thank you

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answered 2016-06-20 11:03:33 -0500

rpg777
6960 ●6 ●15 http://openstudio.net/

What @Dinosaver said, regarding EnergyPlus compatibility.

I'm not 100% clear on what you are trying to calculate here, either. I'm ASSuming you want vertical illuminance on the facade(s), or just inside the space? You could use Radiance in OpenStudio for this, as the illuminance maps can be translated about any axis you want. The problem is that the OS-Radiance measure calculates typical daylight metrics like DA/sDA/UDI and these are based on horizontal illuminance, with a plan-view spatial component. So the metrics will be invalid.

If all you want is vertical illuminance in section, I recommend using a series of glare sensors, aimed at the facade(s) of interest. These will give you an annual schedule of vertical illuminance at each point; you would have to collate this data and visualize manually, but the data is written out, e.g. glare.json in the run/[radiance_measure]/radiance/output directory.

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answered 2016-06-20 02:36:07 -0500

Dinosaver
990 ●1 ●7

Energy Plus does not support non-horizontal illuminance maps. You may try to export your file to Radiance and do rendering there directly, but not sure which GUI will allow you to visualize the results...
I would create zones for each floor and assign individual maps. 6 is not so many...