[BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question

[Wade McLaughlin]

Thanks for your reply.

I re-read a CIR from 6/7/2001 (perhaps the one to which you are referring?) to be sure that I hadn't missed anything.  In the Project Manager's Ruling, it says:"Under the ECM [Exceptional Calculation Method], schedule variations may be used as a basis of engineering calculations for discrete measures that are precluded by the reference standard or the LEEDTM EMP."

However, the description of the ECM  in section 11.5 of the 90.1 manual states that the applicant must provide documentation supporting the accuracy of the exceptional method and that "This documentation must also show that the methods and its results:
1. Do not change the simulation program input parameters that are constrained by the ECM method or any other rules of the adopting authority.  For example, the exceptional method may not violate the rule against using different operating schedules for proposed and budget runs."

So it is still unclear to me whether or not schedule changes are acceptable.  Have you successfully proposed schedule changes such as these through the ECM process?
  ----- Original Message ----- 
  From: Marcus Sheffer 
  To: wmclaughlin at dmiinc.com 
  Cc: BLDG-SIM at GARD.COM 
  Sent: Monday, June 02, 2003 11:04 AM
  Subject: Re: [BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question


  I'd suggest you review the CIRs more closely.  DCV has been approved as an energy saving measure and you can modify schedules to simulate savings.  You must follow the Exceptional Calculation Method (section 11.5) of the Energy Cost Budget Method of 90.1.

  At 10:14 AM 06/02/2003 -0400, you wrote:

    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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Marcus B. Sheffer                          energy & environmental consulting
  Energy Opportunities                     717-292-2636
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  Wellsville, PA USA 17365-9783        sheffer at sevengroup.com
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