Hi,
If you asking to specify night cycle availability manager for parallel PIU, it is not possible. Currently, availability managers can not be specified separately for exhaust fans and PIUs. Instead, the availability status for AirLoopHVAC object is applied to these zone equipment. In future, this flexibility might be extended to exhaust fans and PIUs.
Hope this helps.
Chandan
On 6/14/2011 4:23 PM, moana wrote:
Hi All,
Sorry if this is an obvious question but I haven't managed to get the parallel PIU cycle at night. I got it work on the singleduct terminal as in the example but unsuccessful with the parallel PIU.
Do they work with night cycle?
Thanks
Moana
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "moana" <moana.reynau@...> wrote:
>
> Richard,
>
> Do you know if PIU parallel fan with electric reheat can utilize cycling fan mode? I've been able to have the singleDuct:VAV:reheat terminal cycle but not the parallel PIU...
>
> Thanks
>
> Moana
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@> wrote:
> >
> > There is no deadband on Tstat setpoints in E+. If you want the fan to
> > cycle, set the fan operating mode schedule to 0. This only works for
> > systems that can utilize cycling fan mode. For example, UnitarySystems,
> > Furnaces, and some ZoneHVAC equipment.
> >
> > AirLoopHVAC:Unitary:Furnace:HeatCool,
> > CyclingFanSchedule, !- Supply Air Fan Operating Mode Schedule Name
> >
> >
> > On 6/3/2011 2:06 PM, moana wrote:
> > >
> > >
> > > Sorry All,
> > > Disregard my previous message, when i exported the geometry from
> > > design builder it assigned a schedule to the reporting of the mean air
> > > temperature which shifted the curve when i was viewing it in the
> > > Result Viewer.
> > > I had another question though. When using the dualsetpoint thermostat
> > > is there a way to enter a deadband on the heating and on the cooling
> > > setpoints? As deadband I mean for example if the heating setpoint is
> > > 20C, i would like to allow a +/- 1 degree around it so that the fans
> > > don't run constantly but intermittently rather.
> > >
> > > Thanks
> > >
> > > Moana
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > <mailto:EnergyPlus_Support%40yahoogroups.com>, "moana"
> > > <moana.reynau@> wrote:
> > > >
> > > > Hi All,
> > > >
> > > > I'm trying to model a simple VAV system with local reheat (PIU).
> > > When I set up the availability of the air terminals to - always on -
> > > The indoor temperature is maintained within the setpoints. The problem
> > > is that at night the parallel fan runs all the time. When I set up a
> > > schedule with the fans off at night there is a short swing in
> > > temperature in the evening below the setpoint (17 deg C). Then the
> > > temperature goes back to normal.
> > > > I checked the sizing of the heating coils and flow. Entered the
> > > values back manually and tried to oversize as well (doubles the
> > > capacity) without any effect.
> > > > I also checked the timestep and bumped it to 30. No change.
> > > > If you check the attached file the problem occurs in the winter
> > > (there's an example around 4th Dec).
> > > > There's an old post from 06 refering to a similar problem.
> > > http://tech.groups.yahoo.com/group/EnergyPlus_Support/message/6649
> > > > Not sure if this is still the same.
> > > >
> > > >
> > > > Thanks for your help!
> > > >
> > > > The idf file is in the Files/Problem_submittals folder.
> > > >
> > > >
> > > > Moana
> > > >
> > >
> > >
> >
> > --
> > 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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