[Bldg-sim] DCV and Enthalpy Economizer

Shaun Martin smartin at shaunmartinconsulting.com
Mon Jan 19 08:39:15 PST 2009


Hi Janne,
 
This appears to be a bug in equest - free cooling should override DCV.  I
ran into the same problem a few months ago, and found no solution other than
post-processing hourly report data.
 
Shaun
 

Shaun Martin LEED AP

Principal

Shaun Martin Consulting

504-318 Homer Street

Vancouver BC  V6B 2V2

t: 604-789-1095

e:smartin at shaunmartinconsulting.com

member CAGBC, ASHRAE

  

  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kairento, Janne
Sent: Thursday, January 15, 2009 12:28 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] DCV and Enthalpy Economizer



Hi All,

 

I'm currently working on a model that has CO2 sensing in a few large high
occupancy spaces. When I select DCV Return Sensor with a minimum OA sizing
method of 'Sum of Zone OA', it drives up the energy consumption of my
electric centrifugal open chillers during the winter months (this is in
climate zone 5A). But without the DCV Return Sensor, there is no space
cooling energy consumption during the winter months. It appears as if the
DCV Return Sensor is overriding the Enthalpy Economizer with a drybulb high
limit of 70F. Does anyone have any insight into what is happening?

 

Thank You,

Janne

 

 

Janne Kairento, E.I.T., LEED AP  
Cosentini Associates 

A Tetra Tech Company | Complex World, Clear Solutions 

One Broadway 
Cambridge, MA 02142 
Phone: 617.494.9090 
Fax:  617.494.9292 

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