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Re: [EnergyPlus_Support] Controller actuator error
In the Zone Sizing object, I changed the zone cooling design supply air
temperature from 18 to 12. The warnings are gone, and the cooling air
flow is now 10.7 m3/s (and I didn't change the upper limit in the Load
Range Based Operation objects). The higher the supply air temperature is
in the zone sizing object, the higher the zone air flow rate. When I
changed the zone sizing object to use a 14 degree zone cooling supply
air temperature, the air flow rate jumped to 24 m3/s. If you set it at
18, there is basically a 0 degree delta T across the cooling coil and
the air flow rate goes sky high.
ZONE SIZING,
ATRIUM, !- Name of a zone
12, !- Zone cooling design supply air temperature {C}
brian.aldred@xxxxxxxxxxx wrote:
>
> Thank you for your response, but whilst the loop demand error can be
> removed in this way, in terms of the resultant airflow rates, we still
> have a very high flow rates for the room (volume of ~830m³).
>
> Many of the components are auto sized, and looking at the eplusout.eio
> file; we see the airflow rates auto size to just over 2e6 m³/s. I
> don't know if this needs to be passed to a developer or not, but it
> looks to me like the auto sizing is going awry somewhere.
>
> Any further suggestions would be appreciated.
>
> Brian
>
> ________________________________
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>] On Behalf Of Richard
> Raustad
> Sent: 18 April 2008 15:37
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> Subject: Re: [EnergyPlus_Support] Controller actuator error
>
> Loop Demand=89853672305 W ? That's not a large room, it's a small country.
>
> Check that this number is greater than the Load Range Upper Limit
> specified in your file.
>
> If so, increase the load range upper limit and the equipment should
> turn on:
>
> COOLING LOAD RANGE BASED OPERATION,
> Central Chiller Only, !- Name
> 0, !- Load Range Lower Limit 1 {W}
> 900000, !- Load Range Upper Limit 1 {W}
> Cooling Plant; !- Priority Control Equip List Name 1
>
> brian.aldred@xxxxxxxxxxx <mailto:brian.aldred%40bentley.com>
> <mailto:brian.aldred%40bentley.com> wrote:
> >
> > I have an input file which describes a fairly large room served by a
> > constant volume A/C system. When run with the two design days, I get
> > errors for the controllers as follows:
> >
> > ** Warning ** No valid range found for Loop Demand=89853672305.89 in
> > Load Range Based Operation Scheme=X1:CONTROL.
> > ** ~~~ ** All equipment will be turned off. Other cases of this
> > condition will not be reported.
> > ** ~~~ ** During Warmup, Occurrence info=SUMMERDESIGNDAY, 07/15
> > 05:00 - 05:15
> > ** Warning ** No valid range found for Loop Demand=-3573128227.79 in
> > Load Range Based Operation Scheme=Z1:CONTROL.
> > ** ~~~ ** All equipment will be turned off. Other cases of this
> > condition will not be reported.
> > ** ~~~ ** During Warmup, Occurrence info=SUMMERDESIGNDAY, 07/15
> > 08:00 - 08:15
> > ** Severe ** FindRootSimpleController: Controller error for
> > controller = A10:CONHEAT
> > ** ~~~ ** Occurrence info=SUMMERDESIGNDAY, 07/15 07:00 - 07:15
> > ** ~~~ ** Controller function is inconsistent with user
> > specified controller action = Normal action
> > ** ~~~ ** Actuator will be set to maximum action
> > ** ~~~ ** Controller control type=Temperature
> > ** ~~~ ** Controller temperature set point = 18.00 [C]
> > ** ~~~ ** Controller sensed temperature = 16.39 [C]
> > ** ~~~ ** Controller actuator mass flow rate set to 3106776.89
> > [kg/s]
> > ** ~~~ ** Controller actuator temperature = 16.25 [C]
> > ** ~~~ ** Note: Chilled water coils should be reverse action
> > and the entering chilled
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be below the setpoint temperature
> > ** ~~~ ** Note: Hot water coils should be normal action and the
> > entering hot
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be above the setpoint temperature
> > ** Severe ** FindRootSimpleController: Controller error for
> > controller = A10:CONCOOL
> > ** ~~~ ** Occurrence info=SUMMERDESIGNDAY, 07/15 08:00 - 08:15
> > ** ~~~ ** 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 = 18.00 [C]
> > ** ~~~ ** Controller sensed temperature = 21.81 [C]
> > ** ~~~ ** Controller actuator mass flow rate set to 1104896.15
> > [kg/s]
> > ** ~~~ ** Controller actuator temperature = 25.25 [C]
> > ** ~~~ ** Note: Chilled water coils should be reverse action
> > and the entering chilled
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be below the setpoint temperature
> > ** ~~~ ** Note: Hot water coils should be normal action and the
> > entering hot
> > ** ~~~ ** water temperature (controller actuator
> > temperature) should be above the setpoint temperature
> >
> > I am struggling to determine the cause (and fix) of this error and would
> > like to know if you can give any insights?
> >
> > As far as I can see, we are specifying everything correctly, and if I
> > replicate the same hvac system in another similarly sized room I do not
> > get the error. The file has been uploaded as in - controller actuator
> > error.idf
> >
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP>
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP>>
>
> >
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP>
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP
> <http://f1.grp.yahoofs.com/v1/MH8ISJvGNt3-8l2-iELLPINwGbpBnd1UPahc2YoQcP>>
> >
> > N6jLN908jlXIXTDGkHxBJGY-Hx941z8oEuIe2cMRFAd5xUcXCp224/_Problem_Submittal
> > s/in%20-%20controller%20actuator%20error.idf> in the Files, Problem
> > Submittals section.
> >
> > Any help you can give would be much appreciated.
> >
> > Please contact us further if you require any additional information or
> > assistance.
> >
> > Brian Aldred
> > Software Development
> > Tel: 0114 255 6680
> > Fax: 0114 255 6638
> >
> > Hevacomp Ltd is a company registered in England and Wales with company
> > number 1523216
> > Registered office: Smithywood House, Smithywood Crescent, Sheffield, S8
> > 0NU
> >
> > P Help save paper - do you need to print this email?
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
> --
> 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
> <http://www.fsec.ucf.edu> <http://www.fsec.ucf.edu/
> <http://www.fsec.ucf.edu/>>
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
> [Non-text portions of this message have been removed]
>
>
--
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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