ARUP
901 Market Street, Suite 260, San Francisco, CA 94103
T 415-957-9445
D
415-946-0284
F 415-957-9096
peter.alspach@xxxxxxxx
www.arup.com
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 -----
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.
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energy & environmental consulting
Energy
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