[BLDG-SIM] Simulation of Demand Controlled Ventilation

[Michael Wilson]

Did you just use the occupancy schedule in the
MIN-AIR-SCH? Or did you multiply it by your previous
minimum OA%? ie. if your previous min oa was 20%, the
new MIN-AIR-SCH would be a range of values from 0 to
0.20 that match the occupancy profile. Then the
economizer will allow more OA if needed. The CO2
control shouldn't call for more OA than the previous
minimum.

Of course, this would get more complicated in multiple
zone systems, where the CO2 control will override
critical zone calcs.
  
--- Varkie Thomas <Varkie.Thomas at som.com> wrote:
> In order to vary the outdoor air with occupany (with
> CO2 sensors in the return air that controls the OA
> dampers), I repeated the occupancy schedule in the
> MIN-AIR-SCH also.  The energy use went up compared
> to the same input (which also specified airside
> economizer) that did not have MIN-AIR-SCH.  I assume
> the schedule was applied during the intermediate
> season also when it should be using 100% OA.  In
> this situation the OA must vary independently of the
> supply air which would be based on the cooling load
> in a VAV system
>  
> Varkie.
>  
> 
> -----Original Message-----
> From: Aulbach, John
> [mailto:JAulbach at semprasolutions.com]
> Sent: Thursday, March 20, 2003 12:16 PM
> To: Varkie Thomas; BLDG-SIM at gard.com
> Subject: RE: [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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=====
Michael Wilson
455 Elphinstone Ave.
Gibsons, BC, V0N 1V1
604-886-9864 phone
604-676-2604 fax

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