[BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question

[Wade McLaughlin]

Hi All,

We are currently working on our first LEED certification project.  We use PowerDOE as a modeling tool, but these questions should apply to all modeling platforms.

The LEED process requires modeling practices to follow those outlined in the ASHRAE 90.1 Standard User's Manual.  The standard does not allow for the augmentation of schedules to model efficiency measures.  This is a problem for us in that we often use schedules to simulate measures such as lighting occupancy sensors and demand controlled ventilation.

Typically:
-For lighting occupancy sensors, we adjust our known office schedules using a profile taken from the JIES (I'm afraid I don't have the specific source in front of me).
-For demand controlled ventilation, we develop an hourly outside air Fraction of Design schedule for each AHU using known occupancy schedules and an assumption of 20 CFM per occupant.

To us, both of these methods seem to be accepted modeling practice for determining measure performance.  However, as stated pretty explicitly in the archived credit interpretation requests (CIRs) on the LEED site, LEED won't allow for the adjustment of schedules to simulate these measures.  Does anyone have a method (or insight into developing a method) for either of these calculations in a manner that would be acceptable for the LEED process?

Many thanks in advance for your responses.

Wade

Wade McLaughlin
DMI
450 Lexington St.
Newton, MA  02466
p 617-527-1525 x103
f  617-527-6606

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