[Bldg-sim] climate zone 4a economiser

[Nick Caton]

I'm with Jim.

G3.1.2.6.B and corresponding section G3.1.2.7 do not kick in if economizers aren't required.

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jim Dirkes
Sent: Wednesday, January 29, 2014 6:01 AM
To: Chris Yates; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] climate zone 4a economiser

Dear Chris,
4a does not appear to be referenced in Table 6B...
Regardless, the two tables go together and a high limit is not applicable if no economizer is used.
p.s., I don't recall, but I think my red marks reflect some addenda.

[cid:image003.png at 01CF1CE9.18B4E620]

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris Yates
Sent: Wednesday, January 29, 2014 6:51 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] climate zone 4a economiser

Sorry this was a question! I was just trying to be concise but realised when I re-read that it was incomplete.

It appears that an economizer is not applicable to a baseline building in this case. However, G.3.1.2.6B infers that there may still be a high limit shutoff.

I thought the high limit shutoff was the economizer!

Grateful for your longsuffering patience!

On Wed, Jan 29, 2014 at 11:25 AM, Chris Yates <chris.malcolm.yates at gmail.com<mailto:chris.malcolm.yates at gmail.com>> wrote:
Dear all,

ASHRAE 90.1 - 2007, App G
typical office building
Climate zone 4a

A mixing box should operate predominantly on re-circ whilst introducing a minimal amount of fresh air to the building (such as that required to meet ASHRAE 62.1).

Does anybody else find the tables G3.1.2.6A & B confusing?

Cheers

Chris

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