[Equest-users] Modeling air-side economizer

Sami, Vikram vikram.sami at zgf.com
Wed Mar 4 09:33:23 PST 2015

This is probably happening because the System type: Unit Ventilator is a heating only system (so in essence you are always in economizer mode - there is no cooling modeled).

Vikram Sami
Associate Partner

T 206.521.3509 E vikram.sami at zgf.com
925 Fourth Avenue, Suite 2400
Seattle, WA 98104

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Chris Baker
Sent: Tuesday, March 03, 2015 7:57 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modeling air-side economizer

Does equest require a certain HVAC "System Type" before you can add specific air-side economizer inputs?

I'm currently showing "Unit Ventilator" system type in proposed.
Equest won't allow me to add air-side economizer cycle data (dry bulb shutoff, etc...)

Also, would it be reasonable to keep the current systems as-is in equest...
Then add a "sum" system separately to allow ALL zones to receive air-side economizer cooling?
(with sum system on economizer schedule only)

I should also mention that what I'm modeling are the building's pre-existing air handlers with VFD's and no coil attachment.
Our renovation project involved keeping the old AHU's but with on-demand cooling controls.

Chris Baker
CCI CAD Drafter


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