[Equest-users] Night time setback

[Bruce Easterbrook]

You might want to check on IAQ rules if you are talking a hospital 
operating room.  You may not be allowed to use mixed air.  If you can 
there will be restrictions on where it can come from.  You will also 
have restrictions on the minimums for the OA that will give you problems 
when you get down to 6 ACH, ie you might have to run 100% OA.  This is 
why John assumed 100% OA earlier.
Bruce Easterbrook P.Eng.
Abode Engineering
On 14/04/2014 03:25 PM, Jeremy McClanathan wrote:
>
> You can set a max flow with the min flow schedule.  It should get you 
> what you're looking for.
>
> Jeremy
>
> *___________________________________________*
>
> *Jeremy McClanathan*,P.E., BEMP, HFDP,LEED^® AP
>
> *CDi_Engineers_logo_color.jpg***
>
> 19203 36th Avenue W, Suite 200, Lynnwood, WA 98036**
>
> P 425-672-1071 | F 425-778-8769
>
> P/Please consider the environment before printing this email./
>
> *From:*Bosch, Crina [mailto:CBosch at karpinskieng.com]
> *Sent:* Monday, April 14, 2014 12:06 PM
> *To:* Jeremy McClanathan; 'John Aulbach'; 
> 'equest-users at lists.onebuilding.org'
> *Subject:* RE: [Equest-users] Night time setback
>
> The system is actually a mixed air system with 25% OA.  The zone 
> control is a good idea but I need to set up a maximum flow instead of 
> a minimum. Any thoughts?
>
> Crina Bosch
> Designer, Sustainability
>
> karpinski
> ENGINEERING
> 3135 Euclid Avenue
> Cleveland, OH  44115
> P216.391.3700 ext 3087
> F 216.391.0108
> Ecbosch at karpinskieng.com <mailto:cbosch at karpinskieng.com>
> W _www.karpinskieng.com <http://www.karpinskieng.com>_
>
> *From:*Jeremy McClanathan [mailto:jmcclanathan at CDiengineers.com]
> *Sent:* Monday, April 14, 2014 1:41 PM
> *To:* 'John Aulbach'; Bosch, Crina; 'equest-users at lists.onebuilding.org'
> *Subject:* RE: [Equest-users] Night time setback
>
> If it is a recirc unit, a second option would be to use a zone min 
> flow schedule.
>
> Jeremy
>
> *___________________________________________*
>
> *Jeremy McClanathan*,P.E., BEMP, HFDP,LEED^® AP
>
> *CDi_Engineers_logo_color.jpg***
>
> 19203 36th Avenue W, Suite 200, Lynnwood, WA 98036**
>
> P 425-672-1071 | F 425-778-8769
>
> P/Please consider the environment before printing this email./
>
> *From:*John Aulbach [mailto:jra_sac at yahoo.com]
> *Sent:* Monday, April 14, 2014 10:37 AM
> *To:* Bosch, Crina; equest-users at lists.onebuilding.org 
> <mailto:equest-users at lists.onebuilding.org>
> *Subject:* Re: [Equest-users] Night time setback
>
> Crina:
>
> If your system is 100% OSA (whicI i believe it is), you can use the 
> MIN-FLOW-SCH to set an hourly air flow(and thus outside airflow) for 
> your space.
>
> John R. Aulbach, PE
>
> *From:*"Bosch, Crina" <CBosch at karpinskieng.com 
> <mailto:CBosch at karpinskieng.com>>
> *To:* "equest-users at lists.onebuilding.org 
> <mailto:equest-users at lists.onebuilding.org>" 
> <equest-users at lists.onebuilding.org 
> <mailto:equest-users at lists.onebuilding.org>>
> *Sent:* Monday, April 14, 2014 10:19 AM
> *Subject:* [Equest-users] Night time setback
>
> I am running a model for an operating room. My goal is to show the 
> system savings for a night set back.  I am using a VAV system that is 
> currently running 24/7 at 100% flow.  My goal is to show the benefit 
> of running this system at different maximum airflow levels while 
> maintaining constant flow during unoccupied times.
>
> If my OR schedule is 5am to 5pm, I would like the fan to run at 20 ACH 
> during occupied time, 10 ACH during the first 3 hours of unoccupied 
> time, and 6 ACH for the remaining unoccupied time.
>
> Can I achieve this by adjusting fan schedules, or fan parameters for 
> different occupancy settings?  Any advice that may point me in the 
> right direction would be helpful.
>
> If three different levels of fan speed are too much to ask, I would be 
> happy with being able to run at 20 ACH during occ. And 6 ACH during unocc.
>
> Crina Bosch
> Designer, Sustainability
>
> karpinski
> ENGINEERING
> 3135 Euclid Avenue
> Cleveland, OH  44115
> P216.391.3700 ext 3087
> F 216.391.0108
> Ecbosch at karpinskieng.com <mailto:cbosch at karpinskieng.com>
> W _www.karpinskieng.com <http://www.karpinskieng.com/>_
>
>
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