[TRNSYS-users] Matched flow control

[David BRADLEY]

Adnan,

  If the flow rate is proportional to the ambient temperature then there 
are some models in the TESS Controls library that you can use (Type1250 
for example). If you are doing feedback control (in other words 
comparing a temperature to a desired temperature and implementing a 
controller whose signal is proportional to the difference between the 
two as well as to the integral of the error) then there are some model 
in the standard controls library. You might look at Types 22 and 23. PI 
and PID control can be a little tricky in TRNSYS because we discretize 
time into time steps that are quite long in comparison to the rate at 
which true PID control samples and adjusts a control signal. I would 
recommend looking at the PID example and documentation for some hints on 
how to set it up.

kind regards,

  David


On 06/17/2021 21:17, adnan rasheed via TRNSYS-users wrote:
>
> Hi everyone,
>
> I am using a hot water storage tank in which hot water is coming from 
> the heat pump. From the hot water storage tank to building flow rate 
> was controlled by PI controller in experiment giving some p and i 
> values. The system works in this way: when more heating is needed and 
> outside temperature goes down, more flow and less heating needs less 
> flow coming from the storage tank . I am confused which controller I 
> should use in this situation? or do I need to write an equation??
>
> Thanks
> -- 
> Adnan
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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