[Equest-users] Night time setback

[John Aulbach]

Thank you, Crina, for sharing your solution and results. Will use this on my next hospital.

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------Original Message------
From: Bosch, Crina <CBosch at karpinskieng.com>
To: "Brian Fountain" <bfountain at greensim.com>
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org>
Date: Wednesday, April 16, 2014 8:22:15 PM GMT+0000
Subject: Re: [Equest-users] Night time setback

Thank you all for the great ideas, as always.
I ended up taking Jeremy M's advice by setting the min flow schedule at the reduced airflow. The minimum flows did meet the airflow requirements for most of the time.  There was about 150 hours that the airflow was different which I assume was from residual heat gain from the space during occupied time.  I had to make sure to set my internal loads to a reduced schedule during the first tier reduction so the boxes would back down quickly.
Crina Bosch
Designer, Sustainability
karpinski
ENGINEERING
3135 Euclid Avenue
Cleveland, OH  44115
P  216.391.3700 ext 3087
F  216.391.0108
E  cbosch at karpinskieng.com<mailto:cbosch at karpinskieng.com>
W www.karpinskieng.com<http://www.karpinskieng.com>

From: Brian Fountain [mailto:bfountain at greensim.com]
Sent: Monday, April 14, 2014 6:15 PM
To: Bosch, Crina
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Night time setback

What about using the NIGHT-VENT-CTRL - keywords to run the supply fans at reduced volumes during the unoccupied periods?  You would have to play a bit and set up hourly reports to ensure it is giving you what you are looking for but might work.

[cid:image001.png at 01CF598C.8AABEB90]

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bosch, Crina
Sent: Monday, April 14, 2014 1:20 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
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
P  216.391.3700 ext 3087
F  216.391.0108
E  cbosch at karpinskieng.com<mailto:cbosch at karpinskieng.com>
W www.karpinskieng.com<http://www.karpinskieng.com>


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