[Equest-users] [Bldg-sim] Existing Building LEED Baseline

[Jack Vithayapun]

If a building is going under LEED NC, does it not have to be rotated even 
if it is existing? I think the argument for this had something to do with 
the fact that the AE team could still modify the building envelope to make 
it more efficient.

My understanding was that if a building was applied under LEED EB then it 
would not have to be rotated. 

I could be very wrong though.

-----------------------------------------
Jack Vithayapun
Building Systems Engineer
USDA Forest Service
1720 Peachtree Street, NW
Atlanta, GA 30309
Tel:       (404)-347-2522
Fax:      (404)-347-2399




Gregg Liddick <gliddick at theepstengroup.com> 
Sent by: equest-users-bounces at lists.onebuilding.org
03/12/2010 11:42 AM

To
James Hansen <JHANSEN at ghtltd.com>, Erik Dyrr <erik.dyrr at gmail.com>, 
"omoltay at mimtarch.com" <omoltay at mimtarch.com>
cc
"equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>, 
"bldg-sim at lists.onebuilding.org" <bldg-sim at lists.onebuilding.org>
Subject
Re: [Equest-users] [Bldg-sim] Existing Building LEED Baseline






James is correct regarding the windows ? they should be modeled using the 
pre-renovation U-value and SHGC in the baseline case.
 
The baseline case should not be rotated for existing buildings, nor should 
it be rotated if the construction is an addition.  The basis of the 
rotation requirement for new construction is to reward the project team 
for choosing the most efficient orientation for a building and this is not 
an option for existing buildings and additions.
 
 
Best Regards,
 
Gregg Liddick, EIT, LEED® AP
 
The Epsten Group, Inc.
429 Edgewood Avenue
Atlanta GA 30312
Phone: 404-577-0370  ext. 102
Fax: 404-577-1739
www.theepstengroup.com
 
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From: bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: Thursday, March 11, 2010 9:50 PM
To: Erik Dyrr; omoltay at mimtarch.com
Cc: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Existing Building LEED Baseline
 
I may be misreading one of your emails, but if you are doing a building 
renovation to an existing building, even if you ARE changing out windows, 
the baseline model retains the envelope characteristics of the existing 
building.  You don?t have to bring the baseline windows up to 90.1 
standards unless it is a portion of the building that is being added under 
the proposed work.
 
Also, check the archives ? I thought that some GBCI reviews of projects 
have required the four orientations even for existing buildings.
 
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
 
 
From: bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Erik Dyrr
Sent: Thursday, March 11, 2010 8:25 PM
To: omoltay at mimtarch.com
Cc: equest-users at lists.onebuilding.org; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Existing Building LEED Baseline
 
If the windows are existing to remain, then you are correct that they 
would be the same in the proposed and baseline. If you change out windows 
then the baseline would be min performance per ASHRAE.
 
I think your assumption about not changing the windows by orientation is 
correct.  I am not sure you even need to do four orientations if the 
building is existing.
On Mon, Feb 22, 2010 at 12:14 PM, <omoltay at mimtarch.com> wrote:
Dear All,

Just want to have your opinions about this: Since the building we are
applying for LEED certification is an existing building (and there are no
additions), the building envelope in our baseline model is identical to
the existing conditions in real life. We have interpreted this to also
include the SHGC on the windows and any fixed shading devices on the
windows, so these we have also modeled as existing in real life.

I assume this would further mean that when we are doing the baseline
simulation in four rotations, we do not need to change anything with the
SHGC's on the windows in each rotation.

Although according to Appendix G I believe this should be the way (since
the remark involving existing buildings is printed as the last entry in
the table), I still have some doubts as in the LEED NC reference guide
they have only printed that remark for the building envelope involving
opaque surfaces, and the criteria involving windows seems to be
independent of this (on p.270).

Thanks for any replies,

Omer Moltay, LEED AP
Mimta Ltd.

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