[BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question

[Peter Alspach]

Wade,
 
We are in the process of submitting a CIR that will explicitly state the
method we are using and the fundamentals behind it that meet the intent of
the Exceptional Calculation Method as stated in ASHRAE 90.1. We also feel
there is conflicting information on this and are hoping to clarify the
issue.
 
__________________________________________________ 
Peter Alspach 
Mechanical Engineer 

ARUP 
901 Market Street, Suite 260, San Francisco, CA 94103 
T 415-957-9445 
D 415-946-0284 
F 415-957-9096 
peter.alspach at arup.com 
www.arup.com 


-----Original Message-----
From: Wade McLaughlin [mailto:wmclaughlin at dmiinc.com]
Sent: Monday, June 02, 2003 8:48 AM
To: BLDG-SIM at GARD.COM
Cc: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] LEED / ASHRAE 90.1 Modeling Question


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  <mailto:sheffer at paonline.com> Sheffer 
To: wmclaughlin at dmiinc.com <mailto:wmclaughlin at dmiinc.com>  
Cc: BLDG-SIM at GARD.COM <mailto: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
1200 E Camping Area Road            Fax: 717-292-0585     
Wellsville, PA USA 17365-9783        sheffer at sevengroup.com
a Seven Group member company     <http://www.sevengroup.com/>
www.sevengroup.com


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