[Equest-users] Savings from Demand Control ventilation in eQuest

[madhavmunshi at gmail.com]

A Minimum air schedule on the Baseline system will ensure no OA is being  
supplied in the night when the fans should only be recirculating.

MIN-AIR-SCH
Takes the U-name of a SCHEDULE that contains hourly values of the ratio of  
minimum outside air flow to supply air flow. Values in the MIN-AIR-SCH vary  
from 0.0 (no outside air flow; economizer inactive if specified) to 1.0  
(100% outside air flow). A value of 0.001 actives the economizer. A value  
of -999 returns the hourly value to MIN-OUTSIDE-AIR or to the program's  
calculated minimum outside air value (found on report SV-A for the SYSTEM  
or for each zone for zonal systems). During a warmup period, this schedule  
is normally set to zero and can then be set to -999 during other hours to  
allow the specified or calculated ventilation minimum damper position to be  
used. Note that schedules are ignored in the design routines; therefore,  
the minimum ventilation air desired for design must be specified either at  
the zone or system level.


On Jul 1, 2010 11:29am, "Sami, Vikram" <Vikram.Sami at perkinswill.com> wrote:


> John,

> 78% savings in fan energy and 64% in heating seems high to me. Sounds  
> like your base building is cranking ventilation air pretty hard.



> Vikram Sami, LEED AP
> Sustainable Design Analyst
> 1382 Peachtree St. NE, Atlanta, GA 30309
> t: 404-443-7462 f:
> 404.892.5823 e: vikram.sami at perkinswill.com
> www.perkinswill.com
> Perkins+Will.
> Ideas + buildings that honor the broader goals of society






> From: equest-users-bounces at lists.onebuilding.org  
> [mailto:equest-users-bounces at lists.onebuilding.org]
> On Behalf Of John Aulbach

> Sent: Wednesday, June 30, 2010 11:05 PM

> To: equest-users at lists.onebuilding.org

> Subject: [Equest-users] Savings from Demand Control ventilation in eQuest







> All:







> I realize I am asking for relative numbers, but I am unsure how much  
> Demand Control Ventilation can actually save a building. I ran the DCV  
> Up/Down scenario on a 150,000 sf office in Oregon, where the fans ran  
> 24/7 (and the people weren't
> there at night). BTW, this was a VAV/VFD system.







> My results show a 15% savings in cooling, a 64% savings in heating, and a  
> 78% savings in fan.







> Reasonable? Or am I "mis-simulating ??"








> John R. Aulbach, PE, CEM
> Senior Energy Engineer







> Partner
> Energy
> 1990 E. Grand Avenue, El Segundo, CA 90245

> W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
> www.ptrenergy.com
> | jaulbach at ptrenergy.com











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