Re: [TRNSYS-users] PID control parameters

[Ben Heymer <bheymer@gmail.com>]

A typical HVAC energy model runs with time steps of a few minutes, whereas real PID controllers usually operate on a timescale of seconds. So you may get better performance out of the iterative controller to emulate the behavior of a real PID controller. Or better yet, use a cooling tower type that is able to solve for fan speed as a function of desired outlet temperature instead of one that strictly takes fan speed as an input.

-Ben Heymer

On Wed, Jul 15, 2015 at 3:32 PM, Suhrid A Deshmukh <suhrid@mit.edu> wrote:

Hello,

I am trying to control the temperature of the water leaving the cooling tower to 18C. I am simulating an years worth of data and the simulation timestep in 10 min. I am trying to use the PID controller to do this. i am setting the setpoint variable in the PID controller to 18C and the controlled variable as the temperature of the water exiting the cooling tower. I was wondering what kind of Gain constant and integral time (derivative time can be zero) should I use to get the optimal performance.

Regards,

Suhrid

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