[Equest-users] Variable Volume Help Needed!

[Matt Larson]

Hi Byron,

 

I did look at the system types, and have attached the descriptions from the
users manual.  The two system types I tried modeling are the only ones that
I see would apply to what I'm modeling.

 

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

  _____  

From: Byron Burns [mailto:B.Burns at ha-inc.com] 
Sent: Tuesday, February 18, 2014 3:30 PM
To: Matt Larson; equest-users at lists.onebuilding.org
Subject: RE: Variable Volume Help Needed!

 

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 |  <http://www.ha-inc.com> 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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