[Bldg-sim] Existing Building LEED Baseline

[Gregg Liddick]

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(r) AP

The Epsten Group, Inc.
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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
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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<mailto: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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