[BLDG-SIM] Simulation of Demand Controlled Ventilation

[Sheila Sagerer]

Hello,

There are three options for values in the min-air-sch.

1.  A fraction value (ex:  0.36) in any given hour sets the MINIMUM air as a
fraction of total system air flow for that hour.  The economizer is enabled
in this case  so the actual outside air could be greater than the minimum if
cooling is needed and outside conditions favor the use of the economizer.
NOTE:  Be careful, even if you set the minimum OA ratio in the system
screen, you should still use that same ratio in the schedule.  Using a value
of 1 will give 100% of the total system OA, not 100% of the minimum OA.

2.  A zero (0) value closes the outside air damper AND disables the
economizer.  This is usually used for optimum start periods.

3.  A Flag value (-999) asks DOE to calculate the minimum amount of outside
air needed based on the number of people in the occupancy schedule and the
OA cfm/person specified in the thermal zone.  The economizer is enabled in
this case so again the actual outside air could be greater than the minimum
if cooling is needed and outside conditions favor the use of the economizer.

For demand controlled ventilation, I've used an OA schedule flagged 24/7
(except during optimum start periods = 0).  For constant OA during occupied
periods and closed OA dampers when unoccupied, I use the minimum OA fraction
during occupied periods, "0" during optimum start, and Flag all unoccupied
hours to ensure economizer availability.

Hope this helps.

Sheila Sagerer
Energy Opportunities, Inc


-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Aulbach, John
Sent: Thursday, March 20, 2003 1:16 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Simulation of Demand Controlled Ventilation


What does -999 do in the Min-Air-Sch? Doesn't that "vote" on what OSA is
needed, and also yield to the economizer as well?
  -----Original Message-----
  From: Varkie Thomas [mailto:Varkie.Thomas at som.com]
  Sent: Thursday, March 20, 2003 9:59 AM
  To: BLDG-SIM at gard.com
  Subject: [BLDG-SIM] Simulation of Demand Controlled Ventilation


  We tried scheduling the outdoor air fraction in the Systems component of
the DOE2.1E program by using the occupancy schedule in the Loads component.
This would vary the outdoor air based on occupancy using CO2 sensors in the
Return Air.  However the schedule overrode the air-side economizer.  Can
this problem be fixed in DOE2.1E?

  Varkie Thomas
    -----Original Message-----
    From: Bob Ramirez [mailto:bob at rer.com]
    Sent: Wednesday, March 19, 2003 4:53 PM
    To: BLDG-SIM at gard.com
    Subject: [BLDG-SIM] Simulation of Demand Controlled Ventilation


    Hello group



    Does anyone out there have experience with simulating demand controlled
ventilation in DOE2?  I am especially interested in any work that validates
the use of such a model for estimating energy savings from this control
scheme.  Any advice or information would be greatly appreciated.  Thanks!



    Bob





    Bob Ramírez, P.E.
    Senior Engineer
    Bob at RER.com  , Bob.Ramirez at Itron.com



    RER is now Itron!
    http://www.RER.com/Consulting
    11236 El Camino Real  San Diego, CA 92130    USA

    VOICE:858.481.0081X427  FAX:858.481.7550





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