[Equest-users] Demand Controlled Ventilation

[James Hansen]

I would appreciate anyone's input on this as well.  I have run 4 or 5
models recently with DCV, and the results have almost always been either
a wash, or INCREASED energy for DCV.  Most of them are PIU systems with
either parallel or series VAV boxes.  Have used both return air sensors,
zone sensors, as well as both options for calculating the OA quantities.
I think I'm missing something as well...and I get the same results with
increased space cooling in the winter, as well as increased heating
costs.  I think it must be how I'm defining the zone / system outside
airflow rates, but I can't figure it out.

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Colleen
Nelson
Sent: Tuesday, November 04, 2008 10:12 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Demand Controlled Ventilation

 

I have created a model with DCV as a parametric run and the results are
suspect.  Comparing results for baseline and parametric run, there is
increased space cooling in the DCV model between November-March.  Also,
ventilation fans are running much more during these same months than in
the summer.  And, there are many hours where heating load is not being
met.  Both models include economizer control limited by drybulb at 65 F.

 

I've attached .pd2 and .inp files.

 

I appreciate any help on this.

 

Thanks,

 

 

Colleen Nelson, LEED-AP

Mechanical Engineering

Michaud Cooley Erickson

612.673.6995

 

 

 


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