[TRNSYS-users] Tank 60C

[David BRADLEY]

Barto,
   The flow rate out of the heat exchanger is equal to the flow rate 
into the heat exchanger. You should be able to use whatever output is 
providing the heat exchanger's inlet mass flow rate to also set the 
inlet mass flow rate of the component that comes after the heat 
exchanger. If making such a connection causes convergence problems then 
that is a different issue and I would guess that the reason for it is 
too long a time step. Keep in mind that TRNSYS can make one control 
decision (pump on/ pump off) once per timestep and that if you use a 
long timestep (such as an hour or even 15 minutes) then the controls 
cannot converge upon an on/off decision. Also make sure that you have 
some thermal capacitance in the loop made up of your solar collector, 
heat exchanger, and pump (in other words do not neglect the piping that 
connects all of those things.
Kind regards,
  David



On 3/30/2014 14:42, Barto Pene wrote:
> Dear all,
>
> I'm using the Type 60C - storage tank and I model the heat exchanger 
> inside the tank but when I do the connections I can not find the 
> output  for "Flow rate for heat exchanger" and I can't complete the 
> connection with the pump (or solar collector)-if I put the flow rate 
> from the pump I get error message "The simulation failed to converge 
> after 5 timesteps..."
> Does someone have idea how or what should I do?
>
> Regards
> Barto
>
>
> _______________________________________________
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> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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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