Bldg-sim Digest, Vol 19, Issue 15

3 posts / 0 new
Last post

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.

This e-mail and any attachments contain URS Corporation confidential
information that may be proprietary or privileged. If you receive this
message in error or are not the intended recipient, you should not retain,
distribute, disclose or use any of this information and you should destroy
the e-mail and any attachments or copies.

bldg-sim-request at lists.
onebuilding.org
Sent by: To
bldg-sim-bounces at lists. bldg-sim at lists.onebuilding.or
onebuilding.org g
cc

06/18/2009 03:00 PM Subject
Bldg-sim Digest, Vol 19,
Issue 15
Please respond to
bldg-sim at lists.onebuild
ing.org

Send Bldg-sim mailing list submissions to
bldg-sim at lists.onebuilding.org

To subscribe or unsubscribe via the World Wide Web, visit

http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
or, via email, send a message with subject or body 'help' to
bldg-sim-request at lists.onebuilding.org

You can reach the person managing the list at
bldg-sim-owner at lists.onebuilding.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Bldg-sim digest..."
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 on Wed, 17 Jun 2009
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 on Wed, 17 Jun
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

Shariq_Ali at URSCorp.com's picture
Joined: 2011-10-01
Reputation: 200