I have several questions on the Diva output for the LEEDv4 sDA & ASE simulations.

  1. I'm only seeing three output files when I run the LEED sDA - *.ASE, *.sDA and *.ill.  is this correct?
  2. I am assuming all text output is in lux (even if we choose fc for display) correct?
  3. In the .ASE file what does the # in the 4th column represent?
  4. in the .sDA file what does the # in the 4th column represent?  (I was thinking that this one might be the % of time that the illuminance at that sensor point is > 300lux but I haven't been able to get that # through processing the .ill data.)
  5. Are the illuminance values in the .ill file the combined runs of blinds open & blinds closed when 2% of area >1000lux for sDA?
  6. Is there any way to get the ASE (0 bounce, no blinds) data in a separate output file?  
  7. When Diva is calculating the sDA which times are being used to represent the 10 hour workday?
    • is it 7.5-17.5 to capture 8am-6pm?
    • and is there a shift of the 10-hours for daylight savings time?

Thanks in advance!!

Sandy Houck

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Hi Sandy,

1

Yes, that is correct.

2

Switching to fc does work for me. But the only thing that changes in any case is the label on the side of the scale. Results themselves are in either percentage of occupied hours (sDA) or total hours of direct sunlight (ASE).

3

The 4th column in the ASE file is the number of hours of direct sunlight over 1000 lx (without shading) at that sensor.

4 & 5

You are correct that it is the percentage of occupied hours, but its a little more complicated because it considers the LM-83 defined shading system. The ill file returned is actually only the 'unshaded' illuminance file, so you'd have to piece the 'shaded' and 'unshaded' illuminance files based on the direct sunlight calculations (another illuminance file) to get the sDA percentages.

6

You mean the hourly data? The formatting is not so great, but you can find it in the c:\DIVA\Temp\*Filename*\*Filename*_ase.ill file after running a simulation.

7

It is the c:\DIVA\Schedules\8to6withDST.60min.occ.csv schedule file. So an 8 to 6 occupied hour schedule (even on weekends) and considering a DST shift. To use this schedule is also codified in the sDA metric.

Best,

Alstan

Hello Alstan,

Could you, please, explain one moment:

Based on the two following statements ASE, while running LEED4 sDA+ASE, should always be <2%.

"1. The metric for the LEED v4 calculations (IES-LM-83's sDA / ASE calculations) specifies some very strict dynamic shading control systems, so DIVA will always use those when you run a sDA metric."
http://diva4rhino.com/forum/topics/automatic-shading-not-working-wi...

2. IES-LM-83: All exterior windows must be modelled with blinds, unless (condition 1, 2)... If both of these criteria (1, 2) are not met, then blinds must be modelled. Blinds shall close whenever more than 2% of the analysis points receive direct sunlight.... Direct sunlight is defined as an interior horizontal measurement of 1,000 lux or more of direct beam sunlight...

Then how it is possible to get high ASE numbers?

Also, as you described earlier ( http://diva4rhino.com/forum/topics/leed-v4-credit-7-daylight-option... ) DIVA does all the simulation and calculation steps itself, why than it is required to: "piece the 'shaded' and 'unshaded' illuminance files based on the direct sunlight calculations (another illuminance file) to get the sDA percentages".

I see that I'm dfenitelly wrong somewhere, but can't get where about.

The main reason of asking, is that I have currently 98% ASE (1000/250), while to acheive any points in LEED I need maximum of 10%.

I would appreciate any help.

Regards,
Yulia.

In case anyone is confused the same as I was, I found an answer:

 ASE is calculated without blinds.

It's IES requirement for sDA and ASE modelling.

Have a great modelling,

Yulia.

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