[BLDG-SIM] baseline system

[David S Eldridge]

I would suggest that a mechanical penthouse is not a floor when
determining baseline system type as the presence of the penthouse is for
the equipment that could otherwise be packaged rooftop equipment in the
baseline building.  If the penthouse is not cooled and heated by the
forced air system, then if there is some economic break-point for "tall"
vs "short" buildings the penthouse wouldn't tip the building into the
tall category.

Also, is it less than 5% of the building gross floor area and/or wall
area?  That's the level at which the standard doesn't require a separate
description for an envelope wall type, maybe that could be extended to
the significance of including the penthouse in system selection?

Obviously, if it was an occupied penthouse served by the system under
consideration and greater than 5% of the gross floor area, then I would
count it as a floor.

These are my thoughts, as I actually have this same question in reverse
for a basement mechanical room and would like to hear what others have
to say.

David

 

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Bill
Talbert
Sent: Wednesday, September 12, 2007 10:31 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] baseline system

 

In Table G3.1.1A, the baseline building system is selected based on
building area and the number of floors. Does anyone know if a Penthouse
is considered a floor? From the A90.1 definitions, it appears that the
Penthouse should be included in the gross floor area, but whether the
Penthouse should be considered in defining the baseline building system
type is unclear. For a 120,000 SF building that has 5 floors and a
Penthouse and purchased heat, the baseline system could be System 5 if
the Penthouse is not counted as a floor or System 7 if the Penthouse is
included. Can anyone help clarify this?

Thanks,

Bill Talbert

 
 
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