[TRNSYS-users] PID controller parameters setting - Cooling coils Type508

[Clement Nevers]

Hi everyone,

I have encountered some problems when the PID
controller(type23) was used for controling the outlet air temperature of
cooling coil (type508).

The fluid flow rate of cooling coil is conected
with a outlet of flow diverter (type11). Thus, the fluid flow rate of
cooling coil is determined by the control signal of the flow diverter. I
build this mechanism in order to model a cooling cooling with a bypass
in fluid side (3-ways valve flow controlling).

Then, the PID controller
is used for keeping the outlet air temperature (Controlled variable) of
cooling coil at a setpoint, the control signal is basically the fluid
proportion of the flow diverter. 

But no matter how to adjust the
parameters of PID, the outlet air temperature oscillation cannot be
eliminated.

So, I have the following questions :

How to determine the
parameters of PID controller, such as Gain constant, Integral time and
Derivative time, to avoid  Controlled variable oscillation ? 

Is there
a better way to accurately model this system? 

Thanks in
advance,

Regards

NEVERS CLÉMENT 
_Research Assistant - LMDC, Toulouse_

_ _ 
_mail _: nevers at insa-toulouse.fr 

DÉPARTEMENT DU GÉNIE CIVIL

INSA TOULOUSE 
135 avenue de Rangueil 
31077 Toulouse Cedex 4 
tel :
+33 (0)5 61 55 95 13

web : www.insa-toulouse.fr [1] 

Links:
------
[1]
http://www.insa-toulouse.fr/
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