[TRNSYS-users] Type-2b??? (part2)

[Haluf, Christopher]

Dear all!

It's good to see that you are discussing this topic concerning Type 2b, because I'm also having some problems to make this type do what I want it to.

I have a solarthermal system which is using a water tank in order to save the heat. What I want to do is to control the pump in my system via Type 2b. I want the pump to work only if the difference between the average tank temperature and the outlet fluid temperature of the evacuated tube collectors is more than 5K. Of course, the outlet fluid temperature of the collectors has to be the higher temperature.

Is it possible to use Type 2b in order to solve this problem or should I use another controller? In this case, which one would be the best one?

Any help would highly be appreciated!


Mit freundlichen Grüßen
Christopher Haluf (Intern)

Siemens AG
Corporate Technology
CT PS 3
Günther-Scharowsky-Str. 1
91058 Erlangen, Deutschland
Tel.: +49 (9131) 7-24724
Fax: +49 (9131) 7-21339
mailto:christopher.haluf at siemens.com

Siemens Aktiengesellschaft: Vorsitzender des Aufsichtsrats: Gerhard Cromme; Vorstand: Peter Löscher, Vorsitzender; Wolfgang Dehen, Heinrich Hiesinger, Joe Kaeser, Barbara Kux, Hermann Requardt, Siegfried Russwurm, Peter Y. Solmssen; Sitz der Gesellschaft: Berlin und München, Deutschland; Registergericht: Berlin Charlottenburg, HRB 12300, München, HRB 6684; WEEE-Reg.-Nr. DE 23691322



________________________________
Von: Francois Badinier [mailto:francois.badinier at icax.co.uk]
Gesendet: Mittwoch, 25. November 2009 14:37
An: 'Besana Francesco'; trnsys-users at cae.wisc.edu
Betreff: Re: [TRNSYS-users] Type-2b??? (part2)


Francesco



Sorry I just missed one thing:

-          You have to set your "lower input temperature" to 20.5, as it is now your fixed temperature to compare with.

I forgot to do that in the modified project... sorry my bad.



However, you'll see that the signal won't go to 0 when it reaches 22 C (in your schedule), as it has to strictly go over 22 for the signal to switch to 0. So if you put in your schedule 23C instead of 22C, you'll see the signal switching.



Regards,


François Badinier
Development Engineer
ICAX Ltd
1 Hatfield House
Baltic Street West
London EC1Y OST
francois.badinier at icax.co.uk<mailto:alan.kiff at icax.co.uk>
www.icax.co.uk<http://www.icax.co.uk>






-----Original Message-----
From: Besana Francesco [mailto:Francesco.Besana at eurac.edu]
Sent: 25 November 2009 11:06
To: trnsys-users at cae.wisc.edu
Subject: [TRNSYS-users] Type-2b???



Dear Trnsys-colleague,

It is unbelievable but I have spend more than one hour on that and still doesn't work...the point is:



I would like to switch off a signal when the difference between the High Temp (fix to 22 ) and Low Temp is less than 0 and switch on again when the difference is higher than 1.5..are you able to do that?



At the moment in my deck (attached) it seems that instead off an hysteresis loop I have just a value limit 1.5 where is ON and OFF around it!!!



Thanks a lot and suggestions are well accepted



Francesco





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