I am working on a large three story office building and analyzing it to see how it would preform under Option 1 requirements. I have a sample perimeter open office area that is showing 100% of the grid has an ASE(1000/250) value with no blinds or shades being used. Is it fair to assume that this space would still achieve the credit requirement of 10% of the analysis area, since section 2.2.6 of LM-83 states that "blinds shall close whenever more then 2% of the analysis point receive direct sunlight? Even though ASE calculations are supposed to be done without blinds? I am guess I am a little confused by LM-83 ASE calculation method and the 10% LEED requirement. Any clarification would be greatly appreciated!

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Tue, 01/17/2017 - 19:23

Alain, If your ASE value is 100%, then what that is saying is that 100% of your space will have 1000 lux for more than 250 hours in the year. You are only allowed to have 10% of the space achieving 1000 lux for 250 hours in the year. So no, your space would not achieve this credit. sDA (Spatial Daylight Autonomy) is the simulation which closes the blinds when direct sunlight hits a point. This is to simulate user interaction.

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