[Equest-users] Morning warm-up in eQuest

Hall, Brendan BHall at karpinskieng.com
Tue Dec 11 10:26:11 PST 2012

Morning warm up is a big source of unmet hours in eQuest, is that what you are having problems with? You can also have problems (if your start up is too late in the morning) with huge spikes in the first hour that are then used to incorrectly auto-size equipment. I generally try to spread the morning warm up over a couple hours by stepping up the thermostat 2 degrees an hour until I hit my set point. In the fan schedule you can also use the -999 flag to give the program a range where you would like the AHUs to start up and the program will pick where the optimum start up point is. Look in the help file for more detail.

Brendan Hall

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Paul Diglio
Sent: Tuesday, December 11, 2012 1:19 PM
To: Chris Jones; R B; eQUEST Users List
Subject: Re: [Equest-users] Morning warm-up in eQuest

I have not tried this in eQuest, but from field observations, the typical morning warm-up sequence, especially for Trane rooftop units with factory controls is as follows:

The OA damper goes to the minimum position.
The VAV boxes open fully is so equipped.  In any case, somehow or another the HVAC system provides full airflow to the zones during morning warmup or morning cool down.
The Supply fan VFD ramps up to 60 Hz.
The gas heat in the rooftop unit is enabled to maintain around 85 degrees supply air temperature.

After the zones meet the zone set-points, the unit returns to cooling mode and the VAV dampers will modulate accordingly.

I would think in eQuest, the VAV boxes should open fully since the zones are below set-point.  I would use a schedule to define the supply air set-point.  I think you can also use a schedule to define the supply fan speed.

I would be interested to hear how you solve this problem.

Paul Diglio, CEM, CBCP
87 Fairmont Avenue
New Haven, CT 06513


From: Chris Jones <cj at enersave.ca<mailto:cj at enersave.ca>>
To: R B <slv3sat at gmail.com<mailto:slv3sat at gmail.com>>; eQUEST Users List <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>
Sent: Tue, December 11, 2012 12:37:49 PM
Subject: Re: [Equest-users] Morning warm-up in eQuest

Fan schedule, minimum outdoor air schedule and possibly minimum flow schedule in the zones.  There are also the heating and cooling availability schedules if needed.

At 11:13 AM 11/12/2012, R B wrote:

Has anyone found a good way to model morning warm-up in eQuest?
Appreciate any suggestions. Thanks

Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca<mailto:cj at enersave.ca>
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