Using HB_VSC to compute Sky Factor analysis

[wxcchuck]

Hello there,

I want to know if it would be accurate to use HB_Vertical Sky Component to run Sky Factor analysis, which has been previously discussed in the following posts:

Sky Factor (Rights to Light) BRE

Hello Mostapha, I start here a discussion regarding the Sky Factor analysis. If I understand correctly also, it seems to be a Vertical Sky Component analysis on the interior horizontal working plane at 0.85m above the floor. I copy paste from the Appendix E:Rights to Light of the book “Paul Littlefair**,** Site Layout Planning for Daylight and Sunlight, A good practice, BRE Press, p.60” which is the primary guide for evaluating the impact of new construction to the Rights to Light of the exis…

It's possible to run Radiance analysis to obtain uniform Sky factor?

Hi all, i was wondering if it’s possible to calculate the Uniform sky factor as Radiance analysis result (like Ecotect Data options provides): [image]Thank you in advance!

My concern is that Sky Factor uses a different Waldram diagram (based on a uniform sky) from the one that is used by VSC (based on the CIE standard overcast sky):

If HB_Vertical Sky Component is used to calculate Sky Factor, the results would probably be inaccurate even though the ambient reflections are excluded?

Would love to know if there are any developments on this.

[LittleBuddha]

Hi

Have a read here:

Sky View

[wxcchuck]

Sky View Factor is different from Sky Factor though…

Sky Factor -

[charlie.brooker]

Hopefully this post answers your question.

The input to Sky View can be adjusted to give either sky view or VSC

VSC daylight component

Hi there! I noticed that there isn’t a Vertical Sky Component (VSC) component in the newest version of Ladybug and Honeybee (1.3.0). I was wondering if there is a new component (or script) that could substitute the VSC component in the recent version. Also, I am trying to analyse a façade in terms of daylight (I am trying to use VSC as one of the metrics, together with sunlight hours). Has anyone come across with a different metric (maybe in terms of luxes) to analyse daylight in the facades o…

[LittleBuddha]

Hi.

I am fairly sure that they are in fact the same.

[chris]

@wxcchuck

My concern is that Sky Factor uses a different Waldram diagram (based on a uniform sky) from the one that is used by VSC (based on the CIE standard overcast sky)

That’s why the HB Sky View component has an input for cloudy_sky_. Setting that to True will allow you to run the calculation with the CIE Overcast sky instead of the default uniform one.

[wxcchuck]

Thanks @charlie.brooker @chris @LittleBuddha

I’ve managed to use SkyView component to run RoL analysis. The results are quite close to the ones provided by our consultant.

This is one of the rooms:
blue area produced by SkyView indicating > 0.2% unobstructed sky value
vs.
yellow line from the consultant