|
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 Francois From: Haluf, Christopher
[mailto:christopher.haluf@siemens.com] 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
Von: Francois
Badinier [mailto:francois.badinier@icax.co.uk] 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 -----Original Message----- 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.709 / Virus Database: 270.14.80/2523 -
Release Date: 11/25/09 07:31:00 No virus
found in this incoming message. |