LEED IEQc8.1: combining 9am and 3pm results

[patrickbivona]

Hi,

I've been playing with the daylight simulation for credit IEQc8.1 from the LEED navigator. I'm interested in how the illuminance calculations from 9am and 3pm are combined together to give the overall result.

First, it seems that the plan showing the illuminance contours is an average of 9am and 3pm. That seems to the case when individual simulations are run with FlucsDL at 9am and 3pm and the 3 three illuminance contour maps are compared with one another. Is that correct?

Second, how does IES determine whether a node in the illuminance map counts as being daylighted? Does it take the average of 9am and 3pm and check whether that average is above the 10 fc/108 lux? Or does it take the lowest of the 2 values and checks that value against the 10 fc limit?

Thanks in advance for shining some light on that (ah, I bet I'm not the first one to think of that one!).

Patrick

[PCully]

Hi Patrick,

Bit of a delay getting back to you. We had a few questions similar to this so in VE 2013 Feature Pack 2 the report is improved to be a bit clearer on how the assessment is done and also extra columns are added showing the 9am and 3pm results separately so you can see what area to focus on for failing rooms.

Release Notes are here: http://www.iesve.com/software/download/ ... -notes.pdf

I think the way it's done is to assess each time individually and then it looks at the minimum of the complying areas and this is what is used for the credit assessment but the report will give more information than just that so you can understand what results each room is achieving and why.

Phil