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# Can there be an illuminance map outside of a building?

In order to measure sunlight during the day

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You've tagged your question with "illuminance map" (an EnergyPlus construct), but also with "Radiance". So if you're using purely the former tool, then Dan's answer fully applies. If you're using Radiance only, there are no limitations on where you place your calculation points. If you're using OpenStudio and the Radiance Measure, you can get what you're looking for, somewhat, but it's pretty constrained:

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Thank you very much!

( 2016-04-29 20:06:19 -0600 )edit

I don't believe you can do this with illuminance map. However, there are output variables to measure solar insolation:

Output:Variable,*,Site Solar Azimuth Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Solar Altitude Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Solar Hour Angle,hourly; !- Zone Average [deg]
Output:Variable,*,Site Diffuse Solar Radiation Rate per Area,hourly; !- Zone Average [W/m2]
Output:Variable,*,Site Direct Solar Radiation Rate per Area,hourly; !- Zone Average [W/m2]
Output:Variable,*,Site Exterior Horizontal Sky Illuminance,hourly; !- Zone Average [lux]
Output:Variable,*,Site Exterior Horizontal Beam Illuminance,hourly; !- Zone Average [lux]


If you need insolation on a particular surface you might try putting in a solar cell with 100% efficiency to measure solar input.

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Thank you so much! One last question: How would I put in the solar cells to the model? Can I do this in sketch up?

( 2016-04-29 20:07:23 -0600 )edit