Daylight Facade glare study

questions regarding the handling of DIALux evo. (features, tools, options, settings)
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kikeblackberry
Posts: 88
Joined: Tue Oct 02, 2012 3:02 pm

Daylight Facade glare study

Post by kikeblackberry » Thu Jun 10, 2021 3:50 pm

Hi,
Nowadays there is a trend all over the world to using façade glass for new buildings. Also, It is known those facades reflect the solar rays to its surroundings causing glare for pedestrian and drivers and other issues like reheating of near structures.

About glare evaluation due to facade glass sunlight reflection, ¿Is there a way to calculate direct glare at a point with DIALux EVO or DIALux 4.13?
¿Will be this issue include within one of next versions of EVO?

Thanking in advance your sooner answer
Best regards,

T.Magenheimer
Posts: 1554
Joined: Thu Jul 26, 2012 10:16 am

Re: Daylight Facade glare study

Post by T.Magenheimer » Thu Jun 24, 2021 8:09 am

Hi kikeblackberry,

Unfortunately, this is not possible in our DIALux evo software. Please read the following article in our knowledge base:

https://evo.support-en.dial.de/support/ ... 4-daylight


In DIALux 4 it is possible to calculate the light pollution value ULR (Upward Light Ratio). The ULR value indicates what proportion of the luminous flux of a luminaire or a lighting system is emitted from and above the horizontal. This takes into account the luminaires in their operating position. The percentage of sky illumination that is permissible depends on the ambient zone. The standard defines four ambient zones from E1 to E4, with E1 designating completely dark areas such as national parks or natural monuments of outstanding quality and E4 designating areas of high brightness such as city centers. The ULR limits range from 0% to 25%.

The value of the "Upward Light Ratio" ULR is specified on the "Planning Data" output page of the outdoor scene. DIALux only considers that part of the luminous flux for the ULR value which is emitted directly from the luminaire into the "sky". Luminous flux that illuminates a facade, for example, and that is emitted semi-spatially from the luminaire above, does not contribute to an increased ULR value.

DIALux does not provide any other value to confirm the emission limitation.

We hope that we have been able to help you with this.

ULR.JPG
ULR.JPG (94.56 KiB) Viewed 456 times
Screenshot 2.JPG
Screenshot 2.JPG (89.46 KiB) Viewed 456 times

Best regards
Your DIAL Support Team

kikeblackberry
Posts: 88
Joined: Tue Oct 02, 2012 3:02 pm

Re: Daylight Facade glare study

Post by kikeblackberry » Fri Jun 25, 2021 7:01 pm

Hi T.Magenheimer,
I am pleased for your answer but This is not I was asking for.
What I need to do is a glare study due to sunlight reflections from glass facade like this picture.
arde-la-city-un-rascacielos-genera-un-rayo-solar-mortal.jpg
arde-la-city-un-rascacielos-genera-un-rayo-solar-mortal.jpg (149.45 KiB) Viewed 432 times
I want to know if this is possible with any version of Dialux.
Thenks
Best regards

T.Magenheimer
Posts: 1554
Joined: Thu Jul 26, 2012 10:16 am

Re: Daylight Facade glare study

Post by T.Magenheimer » Mon Jun 28, 2021 12:05 pm

Hi kikeblackberry,

Your plan cannot be realized in any of our lighting planning software products.


Best regards
Your DIAL Support Team

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