[Bldg-sim] Existing Building LEED Baseline

[Erik Dyrr]

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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