[Bldg-sim] Building rotation per Appendix G

James Hansen JHANSEN at ghtltd.com
Tue Oct 21 14:15:28 PDT 2008


I'm working on a project where I am pursuing LEED EAc1 for an existing
building.  As I understand it from the LEED-NC reference guide, as well
as from some snippets of 90.1, I actually model the baseline building as
is currently exists.  The reference guide says:
 
"For existing buildings that are being renovated, the building envelope
design parameters for the Baseline Design should be modeled using the
existing (pre-retrofit) building envelope thermal parameters rather than
the ASHRAE 90.1 prescriptive building envelope requirements for the
specified climate."
 
So I'm using actual window areas, actual insulation values, etc.
 
My question is:  if I'm using this exception, do I also no longer have
to do a simulation at the four different azimuth required by the LEED
EAc1 template?
 
I find 90.1, as well as the user's manual, fairly lacking in describing
how to apply Appendix G to existing buildings in general....
 
Thanks in advance!
 
GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

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