Vikram,
If you look at LEED NC CIR ruling date 2/20/2009 you'll find a similar
situation in a hospital, that was told to use PTACs. This is a situation I
looked up a while ago. I modeled my special pressurization requirement
rooms with PTACs quickly and saw the baseline used less energy than my
proposed design with the chiller / boiler. I didn't go back to look into it
in much, I've got that on my list to do. I can only think it was because
the PTACs fan and coils cycle as needed and don't need to keep running like
the chiller and boiler in the hospital. Anyone have any other insight into
this?
Good luck Vikram.
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06/18/2009 03:00 PM Subject
Bldg-sim Digest, Vol 19,
Issue 15
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Today's Topics:
1. Appendix G Zoning (Vikram Sami)
2. Re: Appendix G Zoning (David S Eldridge)
3. Re: Appendix G Zoning (David Reddy)
4. BESTTEST Certification (Harding, Ross)
5. Re: BESTTEST Certification (Linda Lawrie)
6. Re: BESTTEST Certification (Michael Donn)
7. conversion factors electricity primary energy (leen peeters)
8. VRV / VRF systems (Allison Coley)
9. Re: VRV / VRF systems (Marcus Sheffer)
10. Re: VRV / VRF systems (Julia Beabout)
11. Re: conversion factors electricity primary energy
(Cramer Silkworth)
12. Chilled Water Meter and Utility Rate (eric wang)
----- Message from Vikram Sami
17:22:42 -0400 -----
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.
Thanks
Vikram Sami, LEED AP
----- Message from David S Eldridge
2009 17:33:09 -0500 -----
To: Bldg-Sim
Subject: Re: [Bldg-sim] Appendix G Zoning
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 Eldridge, PE
