[Equest-users] Variable Volume Help Needed!

Byron Burns B.Burns at ha-inc.com
Tue Feb 18 14:30:29 PST 2014


Hello Matt,

It sounds like you are converting it to a PVVT system, have you looked into the eQUEST definitions for that unit type?

Byron D. Burns, EIT, BEMP
Energy Analyst/ Modeler

H&A Architects & Engineers | www.ha-inc.com<http://www.ha-inc.com>
d: (804) 420-1622 p: (804) 285-4171 f: (804) 217-8520

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Matt Larson
Sent: Tuesday, February 18, 2014 5:24 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Variable Volume Help Needed!

I am modeling a building with an existing single zone 4-pipe chilled and hot water air handler unit that is currently constant volume but being converted to constant volume.  The unit feeds many spaces through a single duct.  I modeled the system as a single zone with heat (SZRH) system and tried to add in a variable speed drive and lower the minimum flow ratio, but can't get the fan speed to reduce when not needing 100% flow.  I also tried modeling the system as a variable volume system (VAVS) and the airflow ramps down but then the program adds a VAV box for each zone, which isn't what is occurring.  I am trying to control only to the worst case zone, as will be the installed case.

Which system type should I be using for modeling this system, and how do I get it to model as noted above?

I appreciate any help!  Thanks,

Matt Larson, P.E., QCxP, LEED AP

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