[EnergyPlus_Support] Re: FindRootSimpleController: Controller error

["eplusven" <eplusven@xxxxxxxx>]

The following are other setpoint managers

SetpointManager:OutdoorAirReset,
    Chiller1 ChW Temp Manager,  !- Name
    Temperature,     !- Control Variable
    12.2,            !- Setpoint at Outdoor Low Temperature {C}
    15.6,            !- Outdoor Low Temperature {C}
    6.7,             !- Setpoint at Outdoor High Temperature {C}
    26.7,            !- Outdoor High Temperature {C}
    Chiller1 ChW Supply Outlet;  !- Setpoint Node or NodeList Name



SetpointManager:OutdoorAirReset,
    HWLForFanCoils HW Temp Manager,  !- Name
    Temperature,     !- Control Variable
    82.2,            !- Setpoint at Outdoor Low Temperature {C}
    -6.7,            !- Outdoor Low Temperature {C}
    65.6,            !- Setpoint at Outdoor High Temperature {C}
    10,              !- Outdoor High Temperature {C}
    HWLForFanCoils HW Supply Outlet;  !- Setpoint Node or NodeList Name


Thanks
-Ven
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Fred Buhl <wfbuhl@...> wrote:
>
>  From the warning message, it appears that the setpoint temperature is 
> 11.89, not 24 as
> you wish. And the chilled water entering the coil is at 24.81 C, too 
> warm to do any cooling.
> Probably the chiller is off. Is there some other SetpointManager setting 
> the setpoint?
> 
> Fred Buhl
> 
> On 5/7/2010 8:36 AM, eplusven wrote:
> > Hi all,
> >
> > Could you please help how do i resolve this. Actually i wanted to model AHU air supply always 24C, becasue my Fancoil units will further does cooling or heating. For this reason I set the controller as 
> >
> > SetpointManager:OutdoorAirReset,
> >     Supply Air Temp Manager 1,  !- Name
> >     Temperature,             !- Control Variable
> >     24,                      !- Setpoint at Outdoor Low Temperature {C}
> >     -9,                       !- Outdoor Low Temperature {C}
> >     24,                      !- Setpoint at Outdoor High Temperature {C}
> >     35,                      !- Outdoor High Temperature {C}
> >     Supply Air Temp Nodes 1; !- Setpoint Node or NodeList Name
> > This si giving problem only for one month i.e May. But rest of teh months the simulation going well with lot of warnings
> >
> >
> >    ** Severe  ** FindRootSimpleController: Controller error for controller = CENTRAL COOLING COIL CONTROLLER 1
> >    **   ~~~   **  Occurrence info=MonSIM, 05/02 06:15 - 06:30
> >    **   ~~~   **   Controller function is inconsistent with user specified controller action = Reverse action
> >    **   ~~~   **   Actuator will be set to maximum action
> >    **   ~~~   ** Controller control type=Temperature
> >    **   ~~~   ** Controller temperature set point = 11.89 [C]
> >    **   ~~~   ** Controller sensed temperature = 23.56 [C]
> >    **   ~~~   ** Controller actuator mass flow rate set to 116.44 [kg/s]
> >    **   ~~~   ** Controller actuator temperature = 24.81 [C]
> >    **   ~~~   **   Note: Chilled water coils should be reverse action and the entering chilled
> >    **   ~~~   **         water temperature (controller actuator temperature) should be below the setpoint temperature
> >
> >
> >
> > Thanks
> > -Ven
> >
> >
> >
> > ------------------------------------
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.
> >
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
> >
> >
> >
>




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