[Bldg-sim] Appendix G additional system types

[Paul Riemer]

I do think this necessitates one or more additional system types. As for what spaces go on it, I am inclined to say everything but the dorm rooms themselves.  A possible exception could be there depending on how you are conditioning, ventilating, and exhausting the corridors and common bathrooms.  As for what system type(s), that depends on the area and the number of floors.  If you have spaces on four or more floors on a second system type, you probably triggered VAV (system 5 or 6). G3.1.1b might keep some of your spaces (e.g. laundry, mech/elec/data) as CAV (system 3 or 4) based on the peak load or hour criteria.

Good luck,
Paul Riemer, PE, LEED AP
DUNHAM

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Friday, June 17, 2011 9:29 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Appendix G additional system types

I modeled a residence hall on a college campus using ASHRAE 90.1-2004 Appendix G System Type 1 - PTAC, with a system per zone. I received the following comment from the LEED Reviewer:
"Section G3.1.1 states that additional system type(s) should be used for the non-residential space types (including corridors, classrooms, lounges, public living rooms, etc.). The notes at the end of Table G3.1.1A identify which spaces are considered residential."
The referenced note states, "Residential space types include guest rooms, living quarters, private living space, and sleeping quarters. Other building and space types are considered nonresidential."

There is 4,000 ft2 of classroom and conference room space. If I include corridors, common living rooms, lobby, mech/elec/data, stairwells, storage, common bathrooms and laundry, I would exceed the 20,000 ft2 threshold condition of the G3.1.1 exception.
The example given in the User's Manuals as a qualifying exception is "a residential tower with retail and restaurants at the base".

Does anyone think this necessitates additional system types? (System 3 presumably, one per zone.)

Thanks,
Bill

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