[TRNSYS-users] solar zenith angle
David Bradley
bradley at tess-inc.com
Fri Jul 16 11:59:30 PDT 2010
Charles,
Both are based on the equations that are laid out in Duffie and
Beckman's _Solar Engineering of Thermal Processes_. Type15 performs the
computation in a subroutine called GetIncidentRadiation (look at lines
3517 to 3539 of Type15.f90.) Type109 calculates it in a subroutine
called suncalc (lines 2435 to 2437 of Type109.f90). When we were
developing Trnsys17, we did note a number of discrepancies about the way
that Type109 was operating at timesteps other than 1 hour. You might run
your comparison at a 1 hour time step and see if the problem goes away.
Best,
David
On 7/15/2010 02:11, LAUNAY Charles 226591 wrote:
>
> Dear all,
>
> I would like to know how types 15 and 109 compute the solar zenith
> angle. I can't find this information in the manual.
>
> I'm using TRNSYS 16.
>
> Thanks for your help.
>
> Charles LAUNAY
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
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>
--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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