Availability managers only act on fans or pumps since these are the prime movers for a loop. The last paragraph in the engineering reference overview for the system availability managers states this.
The actual action of turning on or off a loop is taken by the loop prime movers: fans for AirLoopHVACs and pumps for plant loops. For instance when a fan is deciding whether it is on or off, it checks its on/off schedule and whether the loop availability status flag is CycleOn or ForceOff. If the schedule is on and the status flag is ForceOff, the fan will be off. If the fan schedule says off and the status flag is CycleOn, the fan will be on. Thus the availability managers overrule the fan on/off schedule
You will have to use some other method to control your coil. One method may be to use the EMS system to override the cooling coil outlet node temperature set point schedule value (e.g., high value when off, usual value when on). See the EMS documentation and example files starting with EMS* for more information.
On 11/24/2010 11:28 PM, thomawong8 wrote:
Richard,
I am sorry that I misunderstand what you say. I want to have multi zones control.I want to switch off the cooling coil while keeping the fan on. I do not want to switch off the whole plant. Can cooling coil follows the AvailabilityManager:LowTemperatureTurnOff.?
Thank you.
Regards,
Thomas
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> It sounds to me like you want the AHU fan and CW coil to turn on based
> on the output of the AvailabilityManager:HIghTemperatureTunOn object. In
> your file, this will turn on the AHU fan and CW coil when outside air
> temperature is above a certain value.
>
> Now you also want to turn only the fan on at all other times (or other
> times that you specify) without turning on the coils?
>
> If I am understanding this correctly, you want the fan to run all the
> time and the AHU coil and plant to turn on based on the high temperature
> turn on manager.
>
> You could probably use a scheduled system availability manager to turn
> on the air loop all the time, and then use the high temperature turn on
> manager to cycle on the plant when you need it. If the plant is off, the
> air loop coils are off.
>
> If you are using a high temperature turn on manager in both the air loop
> and the plant, then if you add a scheduled availability manager to the
> system availability manager LIST for the air loop, this might give you
> what you want. the high temperature turn on manager will turn on both
> the AHU and the plant when you want. Then the scheduled manager will
> turn on the fan any other time.
>
> There are a number of ways you can do this, you just have to try several
> combinations.
>
> On 11/23/2010 11:03 PM, thomawong8 wrote:
> >
> > Richard,
> >
> > I am sorry. I just mean that the chiller will be switched off while
> > the fan inside AHU can still operate. Or when AHU is switched off, the
> > mechanical fan starts.
> >
> > Regards,
> > Thomas
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > <RRaustad@> wrote:
> > >
> > > Are you talking about 2 different fans? How can your AHU fan be off
> > when
> > > the AHU is on?
> > >
> > > On 11/23/2010 4:26 AM, thomawong8 wrote:
> > > >
> > > > Jason,
> > > >
> > > > Thank you very much for your reply. I am so sorry that i didn't
> > > > clarify my condition. The outside air temperature determines whether
> > > > my AHU is on or off. I have used
> > > > AvailabilityManager:HighTemperatureTurn On to do that. Therefore I
> > > > cannot use simple schedule to turn on or turn off the fan. AHU
> > > > schedule is not regulate in my case. Can
> > > > AvailabilityManager:NightCycle still useful in my case? Thank yuo
> > very
> > > > much.
> > > >
> > > > Regarsd,
> > > > Thomas
> > > >
> > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Jason Kirkpatrick
> > > > <jason.alan.kirkpatrick@> wrote:
> > > > >
> > > > > Thomas,
> > > > >
> > > > > Try using AvailabilityManager:NightCycle
> > > > >
> > > > > This will allow you to have the AHU fan cycle on when the AHU is
> > > > scheduled
> > > > > to be off.
> > > > >
> > > > > If you mean that you have a zone with a fan in addition to an air
> > > > handler,
> > > > > then you can just schedule these to be on or off by defining an
> > > > operating
> > > > > schedule.
> > > > >
> > > > > Regards,
> > > > >
> > > > > Jason
> > > > >
> > > > >
> > > > > On Fri, Nov 19, 2010 at 11:04 PM, Wong Thomas <thomawong8@>wrote:
> > > > >
> > > > > >
> > > > > >
> > > > > > Dear all,
> > > > > >
> > > > > > I am an undergraduate student who is using energyplus to
> > simulate the
> > > > > > energy consumption of a company. When the AHU is off, I would
> > like
> > > > to turn
> > > > > > on the mechanical fan and vice versa. I want to know if there is
> > > > any command
> > > > > > or skills which i can use. Thank you very much.
> > > > > >
> > > > > > Thomas
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > >
> > > --
> > > Richard A. Raustad
> > > Senior Research Engineer
> > > Florida Solar Energy Center
> > > University of Central Florida
> > > 1679 Clearlake Road
> > > Cocoa, FL 32922-5703
> > > Phone: (321) 638-1454
> > > Fax: (321) 638-1439 or 1010
> > > Visit our web site at: http://www.fsec.ucf.edu
> > >
> > > UCF - From Promise to Prominence: Celebrating 40 Years
> > >
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
-- Richard A. Raustad Senior Research Engineer Florida Solar Energy Center University of Central Florida 1679 Clearlake Road Cocoa, FL 32922-5703 Phone: (321) 638-1454 Fax: (321) 638-1439 or 1010 Visit our web site at: http://www.fsec.ucf.edu UCF - From Promise to Prominence: Celebrating 40 Years
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