Re: [EnergyPlus_Support] Controller Error

["jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>]

Try and imagine what is going on... The coil valve is closing more and more as less cooling is required untill closed...then the air temps over the coil keep falling until they are colder than the chilled water in the cooling coil...so now you could even heat with the cooling coil...the problem is the action of the valve is set to close to increase the output temperature (reverse action), so the program is asking you to check if this is not maybe a heating coil? 

So if your simulation shows the inlet air temps drop below the chilled water temperature, it may indicate that you need a frost protection preheat coil upstream of the cooling coil.

This is a common reason for your warning, but I am making many assuptions.

Looking at the reported temperatures it is seems your chilled water temperatures at the coil are warmer than 26.10 deg C. You may have connected your cooling coil to a hotwater loop, or your chilled water loop is not delivering chilled water.

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)

i. A.

Jean Marais

b.i.g. bechtold

Tel.   +49 30 6706662-23

On 08.09.2013, at 17:48, Ivan Mezzacapa <ivan_slip@xxxxxxxxxxx> wrote:

 

Hi!

i don't know how solve this problem. Someone could help me?

Thanks!!

** Severe  ** FindRootSimpleController: Controller error for controller = "FC-3P-A-01 COOLING COIL CONTROLLER"

   **   ~~~   **  Environment=Sao Paulo -TRY WMO#=, at Simulation time=01/16 08:00 - 08:15

   **   ~~~   **   Controller function is inconsistent with user specified controller action = "" action

   **   ~~~   **   Actuator will be set to maximum action

   **   ~~~   ** Controller control type=Temperature

   **   ~~~   ** Controller temperature setpoint = 12.80 [C]

   **   ~~~   ** Controller sensed temperature = 25.78 [C]

   **   ~~~   ** Controller actuator mass flow rate set to 4.27 [kg/s]

   **   ~~~   ** Controller actuator temperature = 26.10 [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

Técg. Ivan Mezzacapa

Projetista  de Ar Condicionado / Consultor em Eficiência Energética

LinkedIN: http://www.linkedin.com/in/ivanmezzacapa

Facebook: http://www.facebook.com/ivan.mezzacapa

Celular: (11)9963-9326

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