[Bldg-sim] Appendix G Zoning

[David S Eldridge]

Vikram, you should follow the exception (c) if you have a few zones in a larger building that have special requirements, different from the bulk of the System 7.  This I think would be intended for cold rooms, server rooms, etc.

For your case with roughly 50% labs and 50% other, you may instead want to use the exception (a) to add a second system type in order to account for differences in space requirements between labs and other spaces.

The design building is probably a good guide - if you are accomplishing your proposed design with one system, then you might find some way to use one system 7.  If you have separate lab/office AHUs in the proposed design, then two systems under exception (a) may be called for.

Depending on the size of the lab, you may end up with several System type 3 or 4 in the baseline, but for larger labs I think the intention would be to make two System 7's.

You may also want to look for the Labs21 guide to Appendix G which includes some other unrelated suggestions.

David

____________________________________________________________________________________________________________________

David Eldridge, PE
LEED(r) AP, HBDP

Grumman/Butkus Associates | 820 Davis Street, STE 300 | Evanston, IL 60201 | Ph: (847) 328-3555, ext 224 | Fax: (847) 328-4550

Energy Consultants and Design Engineers
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Wednesday, June 17, 2009 4:23 PM
To: Bldg-Sim
Subject: [Bldg-sim] Appendix G Zoning


Exceptions to G3.1.1:

 (c) If the baseline HVAC system type is 5, 6, 7, or 8, use separate

single-zone systems conforming with the requirements

of System 3 or System 4 (depending on building

heat source) for any zones having special pressurization

relationships, cross-contamination requirements, or code required

minimum circulation rates.

I'm modeling a building that has baseline system 7. If I read this correctly then all lab spaces will have their own system and that system will conform to system 3  from table g3.1.1A. Is that correct? If so - are all of my lab spaces going to be packaged single zone units? That doesn't seem right - especially since lab spaces are more than 50% of the building area in this case.

I'd appreciate anyone's help with this.


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