[EnergyPlus_Support] DayLighting Sky clearness

["lukeosburn@xxxxxxxxx" <lukeosburn@xxxxxxxxx>]

Hey

I am trying to do some daylighting analysis, and adjusting the sky clearness parameter in the design day specification.

I have noticed that as I decrease sky clearness from 1 down to 0.25 , that occasionally the light level *increases* as the sky clearness *decreases*

This is totally unexpected and cannot think of any explanation how this could be. Explanations? Could this be correct or is there some error in the model or just inaccuracies in how energy plus calculates it.

For an example, the same point, in the same room, just as sky clearness changes, the lux level is.

1.     Lux 274
0.75   Lux 215
0.5    Lux 241
0.25   Lux 125

I have rerun every simulation and am getting the same results.

Help? Thanks




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