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@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
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@icax.co.uk
www.icax.co.uk
-----Original Message-----
From:
Besana Francesco [mailto:Francesco.Besana@eurac.edu]
Sent: 25 November
2009 11:06
To: trnsys-users@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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