[TRNSYS-users] Trnsys 'counter'

[David Bradley]

I am not sure that Type93 will work in this case - it holds on to an 
input value for a set amount of time and then releases it. If I 
understand correctly, you want to hold on to a particular temperature 
value until such time as that value changes by more than 3? After that, 
what does the controller do? What causes the pump to turn off again? If 
you are trying to turn on the pump once a temperature difference gets to 
3K, I think that the simple Type2 differential controller might work. It 
simply compares two values and makes a decision based on their difference.
regards,
 David


leen peeters wrote:
> Hi Farah,
>  
> you can use an input value recall (type 93, to be found in utility, 
> amonsgt the general types) to do so ....
>  
> Leen
>
> On Tue, Sep 22, 2009 at 2:59 PM, Farah Gammoh 
> <fgammoh at stud.fh-offenburg.de <mailto:fgammoh at stud.fh-offenburg.de>> 
> wrote:
>
>     Hello,
>     I am trying to build a controller which switches a pump on every
>     3-Kelvin temperature increase. So the pump operates depending on
>     the temperature increase and is independant of time.
>     till now i havent been able to figure out a way to store or
>     'recall' previous intermediate or output values within an Equation
>     in order to achieve something like a 'counter' variable to which i
>     can keep adding the temperature difference until its value reaches
>     3 or more.
>
>     Is there a way to do that in trnsys and how?
>
>     Thanks,
>     Farah
>
>
>     _______________________________________________
>     TRNSYS-users mailing list
>     TRNSYS-users at cae.wisc.edu <mailto:TRNSYS-users at cae.wisc.edu>
>     https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>   

-- 
***********************************************************************
Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

***********************************************************************

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20090922/9b1c41e1/attachment-0005.htm>