Does anyone know if Daysim can be used to meet LEED requirements? It uses local whether data, but it uses the Perez all-weather sky model. I've been told it is one of the more accurate programs available, but since the reference guide says "clear sky" I'm not sure if it will be accepted.
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TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
888 thumbs up
September 9, 2010 - 11:10 am
Currently and technically, you cannot use Daysim outputs to show credit compliance. However, you could make an argument based upon Daysims outputs and accuracy that a project meets the credit requirements.
I would say that if a space meets at least 30fc 50% of the time throughout the year, it would definitely have at 25 fc on a clear day. You can use the DA (daylight autonomy) max value to show that max illuminance is never met more than 5% of the time. That would take place of the requirement having no more than 500fc in a space at the designated times.
The issue that may occur with making this argument is that the reviewer is not well versed in Daysim and would deny it since it would be an undocumented alternative compliance path. A CIR with your proposed methodology may be the best way to go about using Daysim at this time if it's all you can use.