[Equest-users] Cascading airflows in eQUEST

[Bishop, Bill]

I usually just model the two zones with an air wall in between them, and split the supply CFM between the zones (not necessarily evenly - you would favor the transfer-from zone as it would have conditioning priority). I also use different thermostat schedules for the transfer-to zone (as applicable) as it is usually designed to float more than the transfer-from zone. Both zones would be assigned to whatever system supplies the air to the transfer-from zone.

Regards,
Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kathryn Kerns
Sent: Tuesday, June 03, 2014 11:16 AM
To: PKConsulting; Sami, Vikram
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Cascading airflows in eQUEST

This is just a suggestion and I haven't had time to investigate it yet, but I would think that the zone that the air is cascaded to could be represented by a PSZ system that uses the specified amount of zone transfer supply air with supply heating and cooling temperatures around 65 F heating and 75 F cooling and heating and cooling devices that are artificially constructed so they don't consume energy since you have already paid for the energy in the first zone. Its not perfect, but it might be close enough.

________________________________
From: Equest-users on behalf of PKConsulting
Sent: Mon 6/2/2014 4:05 PM
To: Sami, Vikram
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Cascading airflows in eQUEST
Hi Vik,  no you can't.  DOE2 is a static calculation and cannot exchange from zone to zone.  The only way I can consider to try to mimic something would be to use one large zone for both and then reduce the amount of air changes in that zone compared to a normal input; and then try to widen the t-stat range for a lower load in that zone so it acts more 'neutraly' conditioned than a typical HVAC approach.  Otherwise if you figure something out id like to learn what you did.

Pasha
Ph: 308-763-1593

On Jun 2, 2014, at 3:00 PM, "Sami, Vikram" <vikram.sami at zgf.com<mailto:vikram.sami at zgf.com>> wrote:
Is it possible to cascade airflow from one zone to another in eQUEST? I'm familiar with the OA from system function. Is there an OA from Zone command? I have a situation where we have significant makeup air from one zone coming into another.

Vikram Sami
BEMP, LEED BD+C
Associate Partner



ZGF ARCHITECTS LLP
T 206.521.3509 E vikram.sami at zgf.com<mailto:vikram.sami at zgf.com>
925 Fourth Avenue, Suite 2400
Seattle, WA 98104





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