[TRNSYS-users] Type 2d

[David BRADLEY]

Massimo,
   Make sure that you are using a small enough timestep (1-5 minutes is 
usually best). Type2 can only make one control decision per time step 
and if your timestep is too long then controllers either cannot converge 
on a decision or they don't do a good job of maintaining the setpoint. 
You might also look at Type108. It sounds as though you have set up 
Type2 properly but Type108 offers a somewhat more intuitive thermostat 
model.  You can disable stages 2 and 3 by setting very high (or low, as 
appropriate) setpoints for those stages.
kind regards,
  David



On 04/27/2016 11:39, massimo truant wrote:
>
> Good afternoon,
>
> I have a problem with type 2d. I use it like a thermostat but it 
> doesnt work always. In my project type 2d activates a ventilation 
> system when the difference between imput 1 and imput 2 is less than 
> 2°C and it has to stop the system when that difference is less than -2.
>
> Example
>
> 25° is the temperature that I want
>
> The system should be activated when temperature reaches 27°C and 
> should stop its action when the temperature reaches 23°C.
>
> But it doesn’t work sometimes the system is activated when the 
> temperature is near 26°C and it is stopped when the temperature is 
> near 24.
>
> Someone knows the reason of that?
>
> Thanks to all
>
> Inviato da Posta <https://go.microsoft.com/fwlink/?LinkId=550986> per 
> Windows 10
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

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

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