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

Wed Nov 25 06:13:19 PST 2009

Christopher,

Yes Type 2b can do the job.

Connect your “collector outlet temp” to “upper input temp” and “average tank
temp” to “lower input temp”.

Then set your “upper dead band” to 5 and “lower deadband” to 0 (although in
reality, you’d rather put a “lower dead band” above 0 degrees, to make your
pumping worthwhile, something like 2 for example)  

Regards,

François Badinier

Development Engineer

ICAX Ltd

1 Hatfield House 

Baltic Street West

London EC1Y OST

 <mailto:alan.kiff at icax.co.uk> francois.badinier at icax.co.uk

 <http://www.icax.co.uk> www.icax.co.uk

Francois

From: Haluf, Christopher [mailto:christopher.haluf at siemens.com] 
Sent: 25 November 2009 13:59
To: 'Francois Badinier'; 'Besana Francesco'; trnsys-users at cae.wisc.edu
Subject: AW: [TRNSYS-users] Type-2b??? (part2)

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

 <mailto:alan.kiff at icax.co.uk> francois.badinier at icax.co.uk

 <http://www.icax.co.uk> 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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