[TRNSYS-users] problem with differential controller

[Oriol Casal via TRNSYS-users]

Hi Amirreza,

I am no expert but I would try to run the simulation with a much smaller
timestep. Furthermore if the collectors have no thermal capacitance this
control system is likely to be unstable and oscillate. Try using a
temperature from the tank into the controller.

Regards

Oriol Casal

On Apr 29, 2017 09:36, "Amirreza Heidary via TRNSYS-users" <
trnsys-users at lists.onebuilding.org> wrote:

> Dear All
> I'm using a 5 collectors in series with a differential controller to turn
> on the pump when the difference of collector outlet and inlet temperatures
> is more than 5 and turn it off when it is less than 2.But the signal and
> collector output temperatures are fluctuating too much, also the signal is
> not compatible with temperature variations.as you can see in the
> following diagram, the signal is 1 when the outlet temperature is at
> maximum !
> (red line is collector outlet temperature and orange line is the
> controller signal)
> [image: Inline image 1]
> [image: Inline image 2]
>
> ------------------------------------------------------------
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> *amirrezaheidary*
> *master student of energy systems Engineering*
> *Sharif university of technology*
> *Tehran-Iran*
> *E-mail address*:
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> heidari at energy.sharif.edu
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