[Equest-users] Gross vs. Conditioned Square Footage

[Morteza Kasmai]

Bernie,



Following paragraph is from page G-22 of the ASHRAE 90.1-2007 User’s Manual.



“For nonresidential buildings, the baseline system type depends not only on
the heating source for the proposed building, but also on the number of
floors and the *total conditioned floor area* of the building.”

Base on the ASHRAE language I think your system selection for the baseline
is correct.



Thanks,
Morteza





On Tue, Aug 12, 2014 at 4:02 PM, <equest-users-request at lists.onebuilding.org
> wrote:

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>    1. Gross vs. Conditioned Square Footage (Bernie Hont)
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> ---------- Forwarded message ----------
> From: Bernie Hont <bhont at girard.com>
> To: "equest-users at lists.onebuilding.org" <
> equest-users at lists.onebuilding.org>
> Cc:
> Date: Mon, 11 Aug 2014 21:09:54 +0000
> Subject: [Equest-users] Gross vs. Conditioned Square Footage
>
> Per 90.1, G3.1.1 the baseline system shall be based on… number of floors,
> conditioned floor area… etc.
>
>
>
> I have a 5 story building with a total gross square footage of ~153,172
> square feet. I received a LEED review comment (LEED 2009) that states the
> baseline system should be system 8 rather than system 6 (as I have
> modeled). The SVA report indicates the floor area as 153172 square feet,
> but the LSC report indicates the conditioned area as 144775 square feet for
> calculations. Supply/return shafts, elevator shafts, etc are excluded from
> conditioned floor area as well as wall thicknesses. Is the use of system
> type 6 appropriate since the conditioned floor area is less than 150,000
> square feet or, as the comment suggests, should the baseline system be
> changed to system 8 since the gross area exceeds 150,000 square feet?
> Changing the system type will substantially impact the savings as the
> proposed system is a packaged rooftop unit rather than a chilled water
> plant.
>
>
>
> Thanks
>
>
>
> [image: Girard Logo]
>
> Bernie Hont, PE, LEED AP
>
> Girard Engineering, P.C.
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