Re: [TRNSYS-users] Question about take an output in time "t" as input in "t+1"

[David Bradley <bradley@tess-inc.com>]

Camilo,
 The simulation does not have enough thermal capacitance to solve - you need to add a pipe (and perhaps a pump as well) so that the liquid contained in your loop has enough mass that its temperature changes over some time instead of instantaneously. Make sure that the pipe is big enough to hold at least one timestep of fluid at your chosen flow rate. I would also recommend making your tolerances smaller (they should be no larger than 0.0001 instead of the default, which is 0.001) and running with a smaller time step (I usually use 1 or sometimes  minutes)
Kind regards,
 David



Camilo Arias wrote:

Hi

I have de fallow problem: I need take an output simulation temperature in time "i" as input in the same system in time "i+1". I have a simple example, a auxiliar cooling unit connect to a new equation unit that take a energy amount and calculate the outlet temperature, this temperature is the input to the cooling unit again and the result are not good. I like know the correct form to solve this problem.

Thank you

regards

Camilo Arias

Pd: Attach the example

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