Will need more details for more detailed explanation.
Why are you iterating the sky conditions? If you're implementing daylight controls, suggest that you use the "worst-case" design conditions; i.e. cloudy overcast.
If you're analyzing detailed (day)lighting effects, (which, by iterating small changes, you seem to be doing so) energyPlus is not the place to be doing so. You'd need accurate, physics-based, methods such as Radiance.
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: lukeosburn@xxxxxxxxx
Date: Mon, 16 Mar 2009 09:55:29 +0000
Subject: [EnergyPlus_Support] Re: DayLighting Sky clearness
--- In EnergyPlus_Support@yahoogroups.com , "lukeosburn@..." <lukeosburn@...> wrote:
>
> 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
>
*Bump*
>
> 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
>
*Bump*
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