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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Thanks! Is there a cooling tower component in the HVAC/TESS library which does this?
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<div>Regards,</div>
<div>Suhrid<br>
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<div id="divRpF928728" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> TRNSYS-users [trnsys-users-bounces@lists.onebuilding.org] on behalf of Ben Heymer [bheymer@gmail.com]<br>
<b>Sent:</b> Wednesday, July 15, 2015 5:12 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org<br>
<b>Subject:</b> Re: [TRNSYS-users] PID control parameters<br>
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<div dir="ltr">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.
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<div>-Ben Heymer</div>
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<div class="gmail_quote">On Wed, Jul 15, 2015 at 3:32 PM, Suhrid A Deshmukh <span dir="ltr">
<<a href="mailto:suhrid@mit.edu" target="_blank">suhrid@mit.edu</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hello,
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<div>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.</div>
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<div>Regards,</div>
<div>Suhrid</div>
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