[Bldg-sim] Existing Building LEED Baseline

[James Hansen]

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.

 

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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> 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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