[TRNSYS-users] Type31: Capacity of pipe - timestep of simulation

[David BRADLEY]

Nick,
   Keeping a short time step is really the only way to make sure that 
you get numerical stability. As I think you have done, make sure that 
volume of the pipes is greater than the volume of fluid that the pump 
can transfer in one time step.
Kind regards,
  David


On 7/23/2014 12:30, Nikos Androulakis wrote:
> Hi all,
>
> In a simulation of a closed loop system comprised of two pipes (type31 
> or type709), a solar collector and a pump, with constant flow rate and 
> known (and unchangeable) length of pipes, is the time step of the 
> simulation the only changeable parameter, so as not to have 
> convergence problems, warnings or other problems? In this simulation 
> there is a mass flow rate such that the time step is equal to 60 
> seconds, so the calculations for the completion of the simulation are 
> time consuming. I am using trnsys 16.
> Thank you in advance.
>
> Nick Androulakis.
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David BRADLEY
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