[TRNSYS-users] instantenous value can be calculated by TRNSYS (TYPE 45)

[Diego A. Arias]

Dear Mohammad,

In TRNSYS, all variables are treated as average values over the 
simulation time step, and the convention is that values are reported at 
the end of the time step. So if TRNSYS outputs an ambient temperature of 
2.5 at a given TIME=2, it means the average temperature between 01:00 
and 02:00 was 2.5 (assuming that the time step is one hour).  I would 
recommend that you follow this email thread in the emailing list archive:
https://www.cae.wisc.edu/pipermail/trnsys-users/2005/000785.html

A different question is, how does TRNSYS model the dynamic behavior of 
the components?  Some components assume quasi-steady solution while 
others require the solution of first order differential equations on 
time.  For the case of Type45, it assumes a quasi-steady solution.  You 
should refer to 'Volume 5- Mathematical Reference' for the specific 
information about the components that you plan to use.

Best regards,

Diego



mohammad abdunnabi wrote:
> Hi
> if any one could help me and explain this:
> TRNSYS is transient simulation program, is it able to
> give an instantenous value let us see for example TYPE
> 45 which is thermosyphon solar water heaters, is it
> able to give instantenous temperature distribution or
> mass flow rate in the circultion loop. or it just
> gives an average values over the time interval suggest
> in the calcualtion as type45 quasi-steady state.
> thanks in advance
>
> M. Abdunnabi
> Loughborough University
>
>
>
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-- 

Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706