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

[John Aulbach]

Thank you, Sir !!




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From: "madhavmunshi at gmail.com" <madhavmunshi at gmail.com>
To: "Sami, Vikram" <Vikram.Sami at perkinswill.com>
Cc: John Aulbach <jra_sac at yahoo.com>; "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Sent: Thu, July 1, 2010 2:36:02 PM
Subject: Re: Re: [Equest-users] Savings from Demand Control ventilation in eQuest

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:
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> John,
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> 78% savings in fan energy and 64% in heating seems high to me. Sounds like your base building is cranking ventilation air pretty hard.
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> 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
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> From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org]
> On Behalf Of John Aulbach
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> Sent: Wednesday, June 30, 2010 11:05 PM
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> To: equest-users at lists.onebuilding.org
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> Subject: [Equest-users] Savings from Demand Control ventilation in eQuest
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> All:
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> 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.
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> My results show a 15% savings in cooling, a 64% savings in heating, and a 78% savings in fan.
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> Reasonable? Or am I "mis-simulating ??"
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> John R. Aulbach, PE, CEM
> Senior Energy Engineer
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> Partner
> Energy
> 1990 E. Grand Avenue, El Segundo, CA 90245
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> W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
> www.ptrenergy.com
> | jaulbach at ptrenergy.com
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> This email and any files transmitted with it are confidential and intended solely for the addressee. If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.
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