[Bldg-sim] economiser for climate zone 1

[Jim Dirkes]

Who knows?
However, and until corrected by another who knows better, I would follow the instruction to leave out an economizer in Climate Zone 1b because it seems consistent with the pattern for warmer climates.  My guess is that a zealous engineer mistakenly populated the table (6B) for that zone.

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: Chris Yates [mailto:chris.malcolm.yates at gmail.com]
Sent: Thursday, June 13, 2013 7:16 AM
To: Jim Dirkes
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] economiser for climate zone 1

Great. A minor conundrum remains, quoting:

"Curiously, in my copy (90.1 2007) economisers are not required for 1b (table G3.1.2.6A). However, the following table (G3.1.2.6B) denotes that economiser high limit shutoff should be 75degF for 1b."

Chris
On Thu, Jun 13, 2013 at 12:09 PM, Jim Dirkes <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> wrote:
Correct.

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<tel:616%20450%208653>

From: Chris Yates [mailto:chris.malcolm.yates at gmail.com<mailto:chris.malcolm.yates at gmail.com>]
Sent: Thursday, June 13, 2013 7:08 AM
To: Jim Dirkes
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] economiser for climate zone 1

Thanks Jim,

So your understanding is that a mixing box still exists, but the control that varies outdoor air rate doesn't exist. It is in effect a fixed outdoor air rate.

??

Many thanks

Chris
On Thu, Jun 13, 2013 at 11:48 AM, Jim Dirkes <jim at buildingperformanceteam.com<mailto:jim at buildingperformanceteam.com>> wrote:
Chris,
More warm weather  = less available cooling from outdoor air = less justification for spending money to install economizer controls.
p.s., You must provide minimum outdoor air for ventilation, but need not also cool with outdoor air

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<tel:616%20450%208653>

From: bldg-sim-bounces at lists.onebuilding.org<mailto: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: Thursday, June 13, 2013 6:36 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] economiser for climate zone 1

Is it just me, or is does it seem terrifically wasteful that a climate 1 building doesn't require an economiser? Or am I missing something?

KR / Chris


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