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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.
Sheffer
energy & environmental consulting
Energy
Opportunities
717-292-2636
1200 E Camping Area
Road Fax:
717-292-0585
Wellsville, PA USA
17365-9783
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