[bldg-sim] App G 2004 question

[Kevin Warren]

Peter,

I believe the intent is to give you a way to get some savings from orienting
your building with an eye toward savings. If you pay attention to the sun in
your design (passive solar and/or daylighting), you should get some savings
relative to the average of the rotated orientations. Similarly, you could
get a penalty if you have too much west-facing glass.

I'm not sure how strictly this provision is being enforced. Most of the
modelers I have spoken to ignore it, but that is a very unscientific sample.
These modelers may not be submitting to USGBC.

For a utility incentive program, it often does not make sense to do this
rotation. Those incentive programs typically care about the savings from
incremental changes to the design, particularly those changes that carry an
incremental cost. I'm not sure how one would determine an incremental cost
for your building's orientation, so it is not a factor that would typically
be eligible.

Kevin Warren, P.E., CEM, LEED AP
Warren Energy Engineering, LLC
(610) 255-3798 ph
(610) 255-3406 f

-----Original Message-----
From: bldg-sim at gard.com [mailto:bldg-sim at gard.com]On Behalf Of Peter
Alspach
Sent: Monday, January 23, 2006 8:04 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] App G 2004 question


Anyone out there know the source of why one would be required to
simulate a building in an orientation that it is not in? This doesn't
really make any sense to me - am I missing something?

Peter

-----Original Message-----
From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Rohini
Brahme
Sent: Monday, January 23, 2006 1:13 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] App G 2004 question

I have a question about the Appendix G in 90.1, 2004.
In Table G3.1 the baseline building is to be simulated as follows:
" Orientation. The baseline building performance shall be generated by
simulating the building with its actual orientation and again after
rotating the entire building 90, 180, 270 degrees, then averaging the
results. The building shall be modeled so that it does not shade
itself."
What does --- the building shall be modeled so that it does not shade
itself ---- mean?
Does it mean that if there is, for example, an L shaped building (which
self shades), it has to be modeled as square? rectangle?
Any thoughts on this appreciated.

Thanks
- Rohini

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