[TRNSYS-users] Types 2a and 2b

David BRADLEY d.bradley at tess-inc.com
Tue Aug 25 08:11:11 PDT 2015

   The Type2 Powell's Method mode is not appropriate for what you are 
trying to do. If you are getting more chatter in your collector control 
than you want or if you are running at times when the collector cannot 
sustain an outlet temperature higher than the tank temperature then you 
need to modify the temperature deadbands in the differential controller 
that turns on and off the collector pump. A "turn on" temperature 
difference of 10C and a "turn off" temperature difference of 2C would be 
good starting places.

On 08/25/2015 09:05, Manrique Delgado Benjamin wrote:
> Hi,
> I am getting poor results by using Type2b to control a solar 
> collector, since it operates at some time-steps when it shouldn’t (for 
> example, when the temperature coming out from the tank is higher than 
> the SC output temperature, effectively cooling the tank). I tried to 
> switch to Type 2a, and changed to Powell’s method, but the model won’t 
> run since I am using an Aquastat in a different part of the model, and 
> that one requires the Successive substitution method.
> Has anyone faced this problem before?
> I am using a 0.25 hour resolution.
> In advance, thanks for your help.
> Best regards,
> Benjamin Manrique D.
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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