[TRNSYS-users] question related to type2

[Angel Carrera]

Carol,

I forgot one more thing: make sure that the output control function is
connected to the same type "input control function", cheers

Angel


2014/1/24 Angel Carrera <angel.carrera at aiguasol.coop>

>
> Egun on Carol,
>
> I think there a two basic reasons for this:
>
> 1-The controller gets stuck due to a lack of stability of your model.
> Parameter 1 sets the number of oscillations that the controller can do in a
> single time step; if the controller changes of state while trnsys is
> iterating within a time step, it will never do it (change) more times than
> the value you have set in parameter 1, so it gets fixed when the number of
> changes reaches that value. I can't explain it better than it is done in
> the user help (at least in english), so I recommend you to carefully read
> the introduction in the controllers section of the mathematical reference
> on the trnsys help as well as type 2b section. To solve this, usually the
> best you can do is reduce you time step until you have a coherent behaviour
> of the controller.
>
> 2-The monitoring temperature is governing the controller. If the Input
> Control Functio (inputs tab of the proforma) exceeds the value of the
> parameter 2, then the controller output is set to 0.
>
> I imagine that the first possibility is the one explaining that behaviour;
> reducing the time step is probably a good help for your model, good luck
>
> Angel
>
>
> 2014/1/24 Pascual Ortiz, Carol <carol.pascual at tecnalia.com>
>
>>  Hi TRNSYS user,
>>
>>
>>
>> In my last simulation I use type 2 on/off differential controllers and I
>> do not know why sometimes it works ok and others doesn´t.
>>
>>
>>
>> For example Time step                temperature
>>                       control  signal
>>
>>                                 4016,65
>> 25                                                  0
>>
>>                                 4016,70
>> 25                                                  1
>>
>>                                 4016,75
>> 25                                                  0
>>
>>
>>
>> Do you know what I am doing wrong? Does this ever happen to you?
>>
>> Thank you in advance,
>>
>> Best regards,
>>
>>
>>
>> *Carol Pascual*
>>
>> Energía Térmica/Thermal Energy
>>
>>
>>
>> *División de Energía y Medio Ambiente/*
>>
>> *Energy and Environment Division*
>>
>>
>>
>> *TECNALIA*
>>
>> Área Anardi,5
>>
>> Laida Bidea, Edificio 204
>>
>> E-20730 Azpeitia - Gipuzkoa (Spain)
>>
>> T 902 760 000*
>>
>> M 667119581
>>
>> T +34 946 430 850 (International calls)
>>
>> carol.pascual at tecnalia.com
>>
>> www.tecnalia.com
>>
>>
>>
>> _______________________________________________
>> TRNSYS-users mailing list
>> TRNSYS-users at cae.wisc.edu
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>>
>>
>
>
> --
> *Àngel Carrera*
>
>
> *Consultor Senior Àrea tècnica*
>
> Sistemes Avançats d'Energia Solar Tèrmica SCCL
> C/ Roger de Llúria, 29 3r 2a 08009 Barcelona
> Mòbil: (+34) 663 27 66 80
> Tel: (+34) 93 342 47 55
> Fax: (+34) 93 342 47 56
>
> angel.carrera at aiguasol.coop
> http://www.aiguasol.coop
>



-- 
*Àngel Carrera*


*Consultor SeniorÀrea tècnica*

Sistemes Avançats d'Energia Solar Tèrmica SCCL
C/ Roger de Llúria, 29 3r 2a 08009 Barcelona
Mòbil: (+34) 663 27 66 80
Tel: (+34) 93 342 47 55
Fax: (+34) 93 342 47 56

angel.carrera at aiguasol.coop
http://www.aiguasol.coop
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