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I find a severe error in energy plus and don't understand it!

asked 2015-06-03 20:43:31 -0600

ndongyang's avatar

updated 2017-05-17 12:39:05 -0600

I am getting the error from "Errors" button but don't know what they mean and how to solve them:

** Severe  ** FindRootSimpleController: Controller error for controller = "Big Room COOLING COIL CONTROLLER"
   **   ~~~   **  Environment=RUN PERIOD, at Simulation time=03/06 14:30 - 14:40
   **   ~~~   **   Controller function is inconsistent with user specified controller action = Reverse action
   **   ~~~   **   Actuator will be set to maximum action
   **   ~~~   ** Controller control type=Temperature
   **   ~~~   ** Controller temperature setpoint = 13.74 [C]
   **   ~~~   ** Controller sensed temperature = 13.74 [C]
   **   ~~~   ** Controller actuator mass flow rate set to 17.02 [kg/s]
   **   ~~~   ** Controller actuator temperature = 7.00 [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

1.I have set the plantloop Availability Manager so the cooling coil don`t work On March 6.

2.The controller action=Reverse and I simulate the idf document when I change the controller action=Normal but the error did not change.

Thanks a lot!

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@ndongyang in the future please tag your questions with the software you're using and try to use existing tags. Thanks!

MatthewSteen's avatar MatthewSteen  ( 2015-06-03 21:01:51 -0600 )edit

I will. Thank you!

ndongyang's avatar ndongyang  ( 2015-06-03 21:14:56 -0600 )edit

1 Answer

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answered 2015-06-04 09:45:02 -0600

I think your problem might be elsewhere. We sometimes get this error and it is actually a problem with either the air flow rates or the plant loop. If you can post the whole error file I might be able to identify a different problem that would solve this one at the same time.

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@Annie Marston Ok thanks! I think you are right! But I don`t know how to post the error file.

ndongyang's avatar ndongyang  ( 2015-06-05 05:14:26 -0600 )edit

Hi sorry for the delay, you can attach it to a comment i think, it should be a text file. if not let me know

Annie Marston's avatar Annie Marston  ( 2015-06-09 08:29:30 -0600 )edit

I think the comment don`t post a text file.

ndongyang's avatar ndongyang  ( 2015-06-09 08:54:49 -0600 )edit

Hi the error that jumps out at me in this file is " * Warning * HVACControllers: GetControllerInput: Controller:WaterCoil="CAV-B1 STORE 1 HEATING COIL CONTROLLER". * ~~~ * ..Sensor node not found on water coil air outlet node. * ~~~ * ..The sensor node may have been placed on a node downstream of the coil or on an airloop outlet node." it looks like your sensor node for the water coil is not on a node that EnergyPlus likes, it is asking you to put it on the air outlet node of your heating coil. So in your controller it requests an air outlet node, this should be that.

Annie Marston's avatar Annie Marston  ( 2015-06-10 07:42:57 -0600 )edit

Also your simulation has run through successfully, so if you put system node flow rate, and system node temperature output variables in your model re run it and open the ESO file you will be able to see what exactly is happening in your model. There might be no problem at all.

Annie Marston's avatar Annie Marston  ( 2015-06-10 07:44:28 -0600 )edit

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Asked: 2015-06-03 20:43:31 -0600

Seen: 1,234 times

Last updated: May 17 '17