[TRNSYS-users] Type 60c outlet temperature

[Igor Seso]

Thank you David, exactly that was the problem,  I was recording temperatures above 60 C when there was no flow through the valve - I put a trigger printer recording only temp. when there is flow and the temperatures values were exactly as the set mixing temp.    

I tried to put pipes between the collector the tank and the pump  to get more realistic results regard outlet temperaturesas a result of the increased thermal mass and it was ok - but the only disadvantage is that the pump flow can not go under certain value (total volume of fluid in pipes) it gives convergence problems...so it means that it is not possible to test the influence of low flow on system efficiency etc..

Regards,
Barto



On Tuesday, April 8, 2014 7:34 PM, David BRADLEY <d.bradley at tess-inc.com> wrote:
 
Barto,
  It is not really possible to diagnose the problem without looking
    at the project. I would recommend using an online plotter to look at
    all of the temperatures and flow rates of all the flows going into
    and coming out of the tank. If for some reason all of the
    temperatures in the system are over 60C (including the temperature
    of the tempering water) then Type953 would not be able to temper the
    outlet flow. It could also be that you are seeing higher than 60C
    temperature at the mixing valve when there is no flow through the
    valve.
  If you are not able to sort out the problem using Type65 as a
    debugging tool then you should send your project to your distributor
    so that they can have a look at it.
Kind regards,
 David




On 4/7/2014 08:16, Barto Pene wrote:

Hi , 
>
>
>I get some strange result i.e I can not find logic in it: I use tank Type 60c only heated by standard solar collector installation. I use the differential controller(monitoring temp.) to limit the tank top temperature to 60C and I'm also using tempering valve Type 953 with diverting and three-wat valves for controling the outlet temp. In the simulation I get temperatures at the outlet of the three-way valve (after mixing) higher than 60C (even 80-90C) how is it possible?
>
>
>When I model the HX in Type60c with glycol solution I get convergence problems and with water there is no problem...?
>
>
>Thank you
>
>
>Regards
>Barto
>
>
>_______________________________________________
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA P:+1.608.274.2577
F:+1.608.278.1475 d.bradley at tess-inc.com http://www.tess-inc.com http://www.trnsys.com

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