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Re: [TRNSYS-users] solar collectors

Marco,
  It could be that because the VS pump, collector, and heat exchanger model all neglect the effects of the thermal capacitance of the liquid in the loop that you are getting a numerical problem. I would suggest adding a pipe that has enough volume to store at least one timestep of fluid given your simulation time step and the pump's maximum output flow rate. You may set the losses of the pipe to 0 if you do not wish to consider those in your simulation.
Cheers,
 David


At 06:44 7/10/2007, Marco Zeppetella wrote:
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Dear
users,

I?m modelling a collector
loop that consists of a pump (variable speed), collector(type 1a), heat
exchangers?

I?ve noticed that
increasing the mass flow rate entering in the solar collector, the output
temperature increase too? and at the contrary reducing the flow rate it
decrease.

Probably I?m mistaking or
not considering something? but I don?t understand
what

 

Best
regards

 

Marco
Zeppetella

 
------------------------------------------------------------------------------------
Marco Zeppetella
Departamento de Investigación, Desarrollo e Innovación__ I+D+I
_____________________________________________
Acciona Infraestructuras
Polígono Industrial de Alcobendas

C/Valportillo II, 8

28108 Alcobendas (MADRID)
 



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