[TRNSYS-users] Dynamic efficiency of solar collector

[David BRADLEY]

Mahbubul,
   I am not sure what you mean by static and dynamic. It seems to me 
that if you solve the energy out/energy in equation at each timestep 
then plot the result, you would have the collector's dynamic efficiency 
(in other words its efficiency at any "point" in time). If, however, you 
integrate energy out and energy in before evaluating the equation then 
you have an average (call it static) efficiency for the array over the 
course of the simulation.

   Perhaps you want to see the efficiency of the collector as a function 
of where you are along the length of the collector? In this case, you 
would need to have a noded collector model that reported the temperature 
of each collector node. In this way you could calculate the efficiency 
of each collector node (using the same equation but looking just at the 
energy collected by and incident on each node of the collector instead 
of on the collector as a whole.
Regards,
  David


On 6/25/2012 03:24, mahbubul muttakin wrote:
> Dear all,
>
> I am using flat plate as well as evacuated tube solar collector. I 
> want to simulate the system and find out the dynamic efficiency of the 
> collector, not the static one. static one is energy out/energy in = 
> m.Cp.(To-Ti) / GA. but due to dynamic changes of solar radiation, it 
> doesn't give good thermal performance of the collector. so I want to 
> find out the dynamic efficiency, efficiency over time and tube length.
>
> Thanking in advance.
>
> Regards,
> Mahbubul Muttakin
>
>
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
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