Different skies and results

Replies to This Discussion

Permalink Reply by Mostapha Sadeghipour Roudsari on November 30, 2015 at 8:15pm

Tim, CIE skies are not climate-based. The results are as expected since you're not changing the sky type for December and June. If you want the sky to be generated based on climate data use "Honeybee generate Climate-based Sky" component.

Permalink Reply by Tim on November 30, 2015 at 11:21pm

I want to make comparisons between the amount of illuminance in summer and winter, I don't need  climate-based sky.

Why do I should change the sky type for December and June??

I surprised when I saw the illuminane in 21th of Dec is much more than summer..Is it possible?why?

Thanks

Permalink Reply by Mostapha Sadeghipour Roudsari on December 1, 2015 at 6:53am

Climate-based sky is an sky that is generated based on the values from the weather file so you can see the effect of seasonal changes in radiation values in your study. If you don't use the climate-based sky the value in CIE sky will be generated based on a the sky type and not the radiation values from the weather file. Hope it helps.

Permalink Reply by Chris Mackey on December 7, 2015 at 10:09pm

Tim,

To more specifically address your concern, the December sky that you are getting is not unnatural.  It is just that you have direct sun coming through your louvers when the sun is low on the horizon in the winter but, when the sun is higher in the sky in the summer, all of the direct sun is being diffused by your louver system, giving much mower illuminance values. Illuminance values above 20,000 lux are very common in the outdoors or when you are in direct sun.  If you check the "Global Horizontal Illuminance" of an EPW file, you will see that the outside light levels can get as high as 100,000 lux in the summer at noon in most climates.

I hope this explanation helps,

-Chris