[Bldg-sim] Building rotation per Appendix G

Kevin Kyte kkyte at robsonwoese.com
Wed Oct 22 12:59:34 PDT 2008


What if it is an existing building and there have been alterations to the
floorplan?

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Dakota Kelley
Sent: Wednesday, October 22, 2008 3:16 PM
To: JHANSEN at ghtltd.com
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Building rotation per Appendix G

James,

It is my understanding that it is not necessary to do the rotation on an
existing building.  I am also working on an existing building, and I
plan to submit without rotating.  This topic has been debated on the
forum in the past with opposing opinions, each side having reasonable
arguments, but if my memory is correct the best/last argument was that
existing buildings do not need to be rotated.  I think this position
makes more intuitive sense, too.

I don't believe a definitive resource exists for this question, which is
why I plan to "learn the hard way" on my project.  I have heard that
2009 LEED revisions will address questions specific to existing
buildings; hopefully this will be one of them.  In the interim, I would
ask that anyone with a differing opinion specify the resource guiding
them.

Dakota Kelley
Telios Engineers 

-----Original Message-----
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Subject: Bldg-sim Digest, Vol 11, Issue 20

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Today's Topics:

   1. Building rotation per Appendix G (James Hansen)
   2. About weather data files (M F A Ramadan)


----------------------------------------------------------------------

Message: 1
Date: Tue, 21 Oct 2008 17:15:28 -0400
From: "James Hansen" <JHANSEN at ghtltd.com>
Subject: [Bldg-sim] Building rotation per Appendix G
To: <bldg-sim at lists.onebuilding.org>
Message-ID:
	
<25F2BDB6656B8F40A1289ED906D6B5CF038E117F at EXCHANGE1.cadd_group.ghtltd.co
m>
	
Content-Type: text/plain; charset="us-ascii"

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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Message: 2
Date: Wed, 22 Oct 2008 03:15:54 +0100
From: M F A Ramadan <M.Fahmy at sheffield.ac.uk>
Subject: [Bldg-sim] About weather data files
To: "bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Message-ID: <1224641754.48fe8cdabdb87 at webmail.shef.ac.uk>
Content-Type: text/plain; charset=ISO-8859-1


Hello everybody:

Has any one got an idea about how to compile or generate weather data
files of
EPW or TMY extensions for example from simulation raw data output files,
i.e.
*.txt, *.DAT, *.STAT?

A help would be appreciated.
Best regards,
Mohamad.
------------------------------------



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