[BLDG-SIM] LEED points

[Mike Tillou]

Varkie,
 
If you review Addendum E of ASHRAE 90.1-2001 (available as free download
from ASHRAE website) it addresses these issues you are asking.  While
LEED has not officially adopted this addendum as a simulation
methodology it is my understanding that that is why it was developed.
If you follow the approach outlined in this document I don't think USGBC
will take issue with your simulation.  Please don't quote me on that, I
am certainly not trying to speak for USGBC.  
 
I have used the methodology several times and it provides clear guidance
on how to create the baseline model and the proposed building model.
Most importantly you can easily document your modeling assumptions so
that when questioned you can reference the methodology.
 
Good Luck,
 
Mike 
 
 
Michael Tillou, PE 
LEED AP
etc Group, Inc.
PO Box 749, North Adams, MA 01247
ph. (413) 458-9870  fx. (801) 278-1927
www.etcgrp.com
  

-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of Varkie
Thomas
Sent: Wednesday, May 19, 2004 1:04 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] LEED points



The EA-TAG should also consider that the infiltration due to stack
effect in a high-rise building is affected by having entrances with a
vestibule and revolving doors.  

 

Can occupancy based lighting and occupancy based ventilation be
considered for LEED credits under "Optimize Energy Performance"?   How
should these options be modeled?  In DOE2 the design ventilation value
can be varied by using the occupancy schedule for the minimum OA
schedule.  Occupancy based lighting would have to be "on-off" depending
on occupancy = 0 or occupancy > 0.   This can vary with the space type
and it is difficult to determine for buildings zoned as perimeter and
interior only.  Can we assume say an average 5% off the lighting
schedule for installing occupancy based lighting controls?  How would
you model daylighting controls for LEED credits?  In DOE2 you can locate
the light sensor close to the window and assume it represents a
perimeter space with any depth.  Are there limits on lighting sensor
location and perimeter space depths, areas and volumes?  The ASHRAE
STD90 prescriptive standards are stringent in all categories of
envelope, lighting and mechanical systems.  From the responses I have
received so far, significant energy cost savings (such as 60%) can be
achieved with daylighting controls (not accepted by most energy codes),
renewable energy sources such as PV and GSHP, and thermal storage in
situations where there is a big difference between peak and off-peak
electric rates.  

 

I think that different types of standard building models should be
defined with case studies.  It is difficult to figure out the intent of
STD90 and to convert STD90 legal descriptive language into a base
prototype building model.  10CFR435 is more precise.  I think that the
"Energy & Atmosphere" section of LEED should be explained in more detail
and with examples.

 

Varkie Thomas

Skidmore, Owings & Merrill LLP

 

 



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